Best SMS Marketing Software: 10 Tools Compared

Klaviyo lists a free plan with 150 mobile message credits per month. Postscript shows $0/month on Starter but requires a $49 monthly minimum spend. Attentive does not publish any self-serve pricing at all. Three platforms, three completely different billing models, and the real monthly cost on every one of them depends on message volume, carrier fees, 10DLC registration, and add-on charges the pricing page does not explain.

After analyzing pricing for 45+ business software tools, I can tell you the published price is never the real price for SMS marketing. Carrier surcharges, number rental fees, MMS premiums, and credit-to-message conversion math can materially increase the real monthly cost beyond what the checkout page suggests. This guide breaks down the 10 best SMS marketing platforms on the market by what you pay, not what the landing page advertises.

If your team is evaluating what SMS marketing software does and which platform matches your workflow, this ranking is organized by buyer fit so you can skip directly to your use case. Every pricing figure was verified against official sources (as of May 2026).

Quick Verdict: Best SMS Marketing Software by Use Case

What this means: If you run a Shopify store doing $50K+/month in revenue, Postscript or Klaviyo are the two finalists. If you are a local business sending 500 texts a month, SimpleTexting or SlickText will cost less and require less setup. If you need a developer to build custom messaging workflows, Twilio is the only serious API option on this list.

How We Chose and Ranked These Tools

I evaluated 30 SMS marketing candidates and narrowed the list to 10 based on five weighted criteria:

What this means: A platform that charges $0.01/SMS but requires 20 hours of API setup scores lower overall than a $29/month tool with ready-to-use campaigns, because the total cost of ownership includes your team’s time.

Data sources: Official pricing pages, official help documentation, official product pages, Shopify app listings, and published FAQ content. Testing level: Official research only. I did not conduct hands-on testing for this article. All claims are verified against public official sources. Pricing verified: May 2026. Limitation: Pricing calculators, custom enterprise quotes, and carrier fee structures change without notice. Verify current rates on each vendor’s official pricing page before purchasing.

Products that did not make the final 10 include Brevo (SMS credits sold separately, no dedicated SMS plan), Yotpo SMS (exact current pricing less clear), Textedly (lower-tier limitations), Mobile Text Alerts (less differentiated than finalists), and ClickSend (more global communications API than SMS marketing workflow platform).

Klaviyo gives you a free plan with 250 active profiles, 500 email sends per month, and 150 mobile message credits per month. That is a real entry point for a small ecommerce store testing SMS. But every credit above 150 pushes you into paid territory, and the exact cost depends on a calculator that factors in active profiles, email volume, and SMS credits simultaneously.

Starting price: $0 free plan; paid pricing varies by profile count and messaging usage
Free plan: Yes, with limits above
Free trial: Free plan is the entry; paid trial duration not confirmed
Billing model: Usage-based (profiles + sends + credits)

Why it ranks first: Klaviyo is the only platform on this list that combines SMS campaigns, SMS automation, segmentation, drag-and-drop editors, customer profiles, and reporting in one ecommerce data platform with 350+ integrations. If you are already using Klaviyo for email, adding SMS requires zero migration.

Key features:

• SMS and MMS campaigns with automation triggers
• Segmentation by customer behavior, purchase history, and engagement
• Drag-and-drop email and SMS flow builder
• Customer profile analytics and reporting dashboard

Hidden costs to watch: Email support only after 60 days on the free plan. Costs increase when profile and send limits are exceeded. The paid price depends on your exact configuration, so you cannot find a static price table.

Best for: Ecommerce brands that want SMS, email, segmentation, automation, reporting, and customer data in one platform.

Avoid if: You only need occasional low-cost bulk texting without ecommerce data workflows. Klaviyo is overbuilt and potentially overpriced for a 200-contact list sending one campaign per month.

If your team already runs Klaviyo for email marketing, SMS is a natural add-on. If not, compare the paid tier cost at your profile count before committing.

Postscript lists $0/month platform fee on Starter with a $49 monthly minimum spend, plus usage-based SMS/MMS rates and carrier fees. Growth is $100/month. Professional is $500/month.

Starting price: $0/month platform fee (Starter) + $49 monthly minimum spend
Free plan: No permanent free plan; Starter has $0 platform fee but minimum spend applies
Free trial: Free trial available
Billing model: Usage-based with platform fee tiers

Why it ranks here: Postscript is the most focused Shopify SMS platform on this list. Every feature, from subscriber acquisition tools to response branching to branded short links, is built for ecommerce revenue. If you sell on Shopify, Postscript connects directly to your store data for abandoned cart texts, post-purchase flows, and segment-based campaigns.

Key features:

• SMS/MMS campaigns and automations
• Unlimited segments
• Dedicated toll-free number (Starter)
• Subscriber acquisition tools and opt-in keywords
• Branded short-link subdomain
• Response branching and AI ecommerce SMS workflows
• Custom integrations and API access on higher plans

Hidden costs to watch: Carrier fees apply on top of message rates. MMS costs more than SMS. The $0/month label is misleading because the $49 minimum spend means your real floor is $49/month, not $0. Factor in carrier surcharges and MMS pricing when budgeting.

Best for: Shopify and ecommerce brands that want SMS-first campaigns, automations, subscriber growth tools, and revenue-focused texting.

Avoid if: You are not an ecommerce business. Postscript’s entire product is built around store data, product catalogs, and purchase behavior. A law firm or real estate agency would find zero value here.

If you are comparing Postscript against a broader email marketing platform that includes SMS, Klaviyo is the more complete option but at a higher total cost for most configurations.

Attentive does not publish a self-serve pricing table. Pricing is custom and usage-based, tailored by message volume, subscriber list size, number of channels, and AI products selected.

Starting price: Custom / contact sales
Free plan: None
Free trial: Yes, fill out a form to request
Billing model: Custom usage-based

Why it ranks here: Attentive is built for large retail and DTC brands. The feature set includes SMS, email, RCS, push, AI personalization, single customer ID, customer signals, and journey orchestration. No other platform on this list offers RCS messaging and multi-channel AI at this depth.

Key features:

• SMS, email, RCS, and push messaging
• AI personalization engine
• Single customer ID and customer signals
• Journey orchestration across channels
• Platform API and partner directory
• Enterprise ecosystem resources

Hidden costs to watch: The exact cost depends on your message volume, subscriber list, channels, and AI product selections. If you are a 500-contact business, Attentive is overbuilt. The platform is designed for brands sending hundreds of thousands of messages monthly.

Best for: Large retail and DTC brands that need SMS, email, RCS, push, AI personalization, and enterprise support.

Avoid if: You are a small business that needs self-serve public pricing and low monthly commitments. Attentive requires a sales conversation, and the minimum spend is well above what most local SMBs would budget.

SimpleTexting’s official pricing selector shows $39/month estimated monthly cost for 500 credits when billed yearly at $398.40. The entry is clear, and the feature set covers mass texting, two-way messaging, autoresponders, scheduled texts, keywords, data collection, drip campaigns, recurring texts, and API.

Starting price: $39/month for 500 credits (billed yearly: $398.40/year)
Free plan: None
Free trial: Yes, no credit card required
Billing model: Flat-rate with credit overage at $0.055/credit

Why it ranks here: SimpleTexting is the SMB workhorse. No ecommerce lock-in. No Shopify requirement. If you run a dental office, a fitness studio, a restaurant chain, or a local services business, SimpleTexting gives you the core campaign tools without forcing you into a DTC marketing suite.

Key features:

• Mass texting with scheduled sends
• Two-way conversational messaging
• Autoresponders and drip campaigns
• Keywords and data collection forms
• Recurring texts and API access
• Integrations: Zapier, Mailchimp, WooCommerce, Mindbody, Zendesk, Eventbrite

Hidden costs to watch: Local number costs $10. One-time carrier registration is $4. Additional carrier fees apply per message. Advanced done-for-you automations require custom pricing.

Best for: Local businesses and SMBs that want mass texting, keywords, two-way messaging, sign-up tools, and automations without ecommerce-suite complexity.

Avoid if: You are a developer team needing API-only pricing, or an ecommerce brand needing deep product and catalog data automation. SimpleTexting is a campaign tool, not a data platform.

EZ Texting’s official pricing FAQ states SMS costs can range from $0.01 to $0.05 per SMS, and monthly subscriptions range from $25 to $500+ depending on plan and volume. Annual plans save up to 20%.

Starting price: From approximately $25/month (lower end of published range)
Free plan: None
Free trial: Free trial available
Billing model: Flat-rate credit tiers

Why it ranks here: EZ Texting is the easiest platform for nontechnical marketers. The combination of AI Compose (draft messages with AI), AI Reply, campaign calendar, link tracking, image tools, and templates means a solo marketer can launch an SMS campaign in under 15 minutes with no training.

Key features:

• Mass texting and conversational texting
• Automated workflows with triggers
• AI Compose and AI Reply
• Campaign calendar and link tracking
• SMS API for custom integrations
• Image editing tools and templates

Hidden costs to watch: The per-SMS cost varies by plan and volume. A team sending 10,000+ messages monthly could pay $500–$5,000 per month. The official pricing page gives ranges rather than a static tier table, so the exact plan math should be verified directly.

Best for: Beginners and nontechnical marketers who want templates, AI message drafting, campaign planning, and workflow tools.

Avoid if: You need the lowest possible per-message cost with exact static plan math. EZ Texting’s pricing transparency is range-based, not tier-based.

SlickText starts at $29/month for 500 credits with a 14-day free trial. The differentiator is the subscriber growth toolkit: popups, web forms, tap-to-join links, keywords, QR codes, and segments.

Starting price: $29/month for 500 credits
Free plan: Free trial only
Free trial: 14-day free trial
Billing model: Flat-rate credit tiers ($29, $49, $79/month and higher)

Why it ranks here: Most SMS platforms treat list building as secondary. SlickText treats it as the product. Every plan includes campaign tools, inbox, workflows, and analytics, but the opt-in toolkit (popups, QR codes, keywords, tap-to-join) is why teams pick SlickText over alternatives at this price.

Key features:

• SMS/MMS campaigns with inbox
• Automated workflows and drip sequences
• Web forms, popups, keywords, QR codes, tap-to-join links
• Segments and analytics
• Integrations: Shopify, Zapier, HubSpot, Salesforce, Mailchimp, Make, Pipedrive, Slack, and more

Hidden costs to watch: 1-on-1 onboarding starts at higher tiers only. A dedicated Customer Success Manager is limited to higher-volume plans. The $29 tier gives you the core features but not white-glove support.

Best for: Marketers focused on growing their SMS subscriber list with multiple opt-in channels.

Avoid if: You want a deeply integrated email and SMS ecommerce CRM or you need developer-only API pricing. SlickText is a growth and campaign tool, not a full marketing suite.

Omnisend has a $0 free plan with 500 emails per month to 250 unique contacts. Standard starts at $16/month. Pro starts at $59/month. But here is the catch: for users subscribing to Pro on or after May 4, 2026, SMS is an add-on with volume-based rates starting at $0.007/SMS for US/Canada recipients.

Starting price: $0 free plan; SMS add-on from $0.007/SMS on Pro
Free plan: Yes, $0/month (email only, 500 emails to 250 contacts)
Free trial: Free plan requires no credit card
Billing model: Usage-based (email plan + SMS add-on)

Why it ranks here: Omnisend’s value is the bundle: email campaigns, push notifications, automations, advanced AI features, and product recommendations all in one ecommerce platform. If you are already paying for an email tool and want to add SMS at $0.007 per message, the combined cost beats running two separate platforms.

Key features:

• Email campaigns with drag-and-drop builder
• SMS add-on with volume-based pricing
• Push notifications
• Automation workflows with pre-built ecommerce triggers
• Advanced AI features on Pro plan
• Product recommendations
• 24/7 customer support

Hidden costs to watch: Your bill adjusts monthly based on usage. SMS credits are purchased separately. Under the new pricing (May 2026+), Free and Standard plan users cannot send SMS without upgrading to Pro. That makes the real SMS entry point $59/month + SMS credits, not $0.

Best for: Ecommerce stores that want email, push, automation, AI, and SMS add-on economics in one platform.

Avoid if: You need SMS on a free or low-cost plan. Omnisend’s SMS is now a Pro-only feature for new subscribers, and the $59/month floor may not fit a 100-contact list.

TextMagic’s official pricing page shows 1,000 US SMS for $49 at a standard rate of $0.049/SMS through TextMagic numbers. If you connect your own CPaaS provider (Twilio, Vonage, Sinch, or Bandwidth), the rate drops to $0.01/SMS.

Starting price: Pay-as-you-go; $0.049/SMS (TextMagic number) or $0.01/SMS (connected CPaaS)
Free plan: No permanent free plan; free testing credit available
Free trial: Free testing credit, no credit card required
Billing model: Usage-based, no monthly platform fee

Why it ranks here: TextMagic is the clearest pay-as-you-go option. No monthly subscription lock-in. You pay for what you send. For businesses with irregular sending patterns (seasonal campaigns, event notifications, appointment reminders), this billing model avoids the waste of a monthly plan you only use twice.

Key features:

• SMS and MMS messaging
• Two-way SMS chat
• Global coverage (not US-only)
• Opt-out management and compliance tools
• Email-to-SMS templates
• Scheduled campaigns
• AI templates
• Connected CPaaS integration (Twilio, Vonage, Sinch, Bandwidth)

Hidden costs to watch: Local or toll-free number costs $10/month. 10DLC campaign renewal costs $10/month after the free first month. MMS costs $0.08 per message. One SMS message part is 160 plain text characters. Longer messages consume multiple parts.

Best for: Businesses that send irregular SMS campaigns and want usage-based billing instead of a monthly subscription.

Avoid if: You need deep ecommerce abandoned-cart, product catalog, or segmentation automations. TextMagic is a sending tool, not a marketing automation suite.

Salesmsg starts at $25/month for 500 credits. That is the lowest entry point for a tool with CRM integrations, two-way messaging, calling, and mass texting built in.

Starting price: $25/month for 500 credits
Free plan: None
Free trial: 14-day free trial + 30-day money-back guarantee
Billing model: Flat-rate credit tiers ($25, $49, $99, $179, $249/month; custom above 10,000 messages)

Why it ranks here: Salesmsg is not an ecommerce SMS tool. It is built for sales and service teams that need a shared inbox, CRM-connected conversations, and calling from the same number. The integration list is the strongest CRM-focused set on this list: ActiveCampaign, Aircall, Attio, HubSpot, Intercom, Keap, Make, Pipedrive, Salesforce, Slack, Twilio, Zapier, Zoho, plus API.

Key features:

• Unlimited contacts on all plans
• Two-way SMS/MMS messaging
• Mass texting campaigns
• Built-in calling with local or toll-free number
• CRM-connected conversation threading

Hidden costs to watch: Taxes and fees are added at checkout. The free trial auto-converts to the Premium Plan at $49/month, not the $25 Starter. Chat seats cost $10/month each. SMS uses 1 credit per 160 characters; MMS uses 2 credits per 1,600 characters.

Best for: Sales and service teams that want two-way SMS/MMS, calling, CRM integrations, and shared team communication.

Avoid if: You need ecommerce-specific features like Shopify revenue attribution, abandoned cart flows, or product catalog automations. Salesmsg is not built for that.

Twilio lists US long-code outbound SMS at $0.0083 per message and inbound SMS at $0.0083 per message. No monthly platform fee for SMS. Pure API, usage-based billing.

Starting price: $0.0083/SMS (US long-code outbound)
Free plan: Start-for-free CTA exists; not a permanent free marketing plan
Free trial: Start-for-free signup; exact free credit amount not confirmed
Billing model: Usage-based API pricing

Why it ranks here: Twilio is not a marketing platform. It is messaging infrastructure. Developers build custom SMS marketing, alerts, transactional messaging, and cross-channel workflows on top of Twilio’s Programmable Messaging API. If your team has engineering resources and needs full control over routing, compliance, delivery, and scaling, Twilio is the foundation.

Key features:

• Programmable Messaging API for SMS/MMS
• Conversations API for threaded messaging
• Compliance tools and 10DLC registration
• Link tracking and scheduling add-on
• Carrier routing and delivery insights
• Developer SDKs and documentation

Hidden costs to watch: Carrier fees are additional. A2P 10DLC registration and onboarding fees apply. Phone number rental costs extra. Engineering time to build and maintain the integration is the largest hidden cost. A marketing team without a developer cannot use Twilio productively.

Best for: Developer teams building custom SMS marketing, alerts, transactional messaging, and cross-channel messaging workflows.

Avoid if: You are a nontechnical marketer who wants a ready-to-use campaign dashboard without engineering work. Twilio has no drag-and-drop campaign builder, no template library, and no visual automation flow.

Best SMS Marketing Platforms by Budget

If your decision starts with budget rather than use case, here is how the 10 platforms break down by monthly cost:

What this means: The cheapest entry point with a subscription is Salesmsg at $25/month. The cheapest per-message rate is Twilio at $0.0083/SMS, but that requires a developer. For most SMBs sending 500–2,000 messages per month, the practical monthly cost lands between $29 and $70 depending on carrier fees and message volume.

Pricing Comparison: Starting Price vs Real Monthly Cost

What this means: The “starting price” on every platform in this table is the best-case scenario. A more realistic comparison for a team sending 1,000 US SMS per month:

• TextMagic: ~$49 (1,000 x $0.049) + $10 number + $10 10DLC = ~$69/month
• Twilio: ~$8.30 (1,000 x $0.0083) + carrier fees + number + 10DLC = ~$30–40/month (plus engineering)
• SimpleTexting: $39/month base covers 500 credits; 500 extra at $0.055 = ~$66.50/month + number fees
• SlickText: $49/month for 1,000 credits = $49/month + potential carrier fees
• Salesmsg: $49/month for 1,000 credits = $49/month
• Postscript: $49 minimum spend + per-message rates + carrier fees = $49–70/month
• Klaviyo: Depends on profile count and configuration; free covers only 150 credits
• Omnisend: $59/month Pro + SMS credits = $59+/month
• EZ Texting: Varies; estimate $40–80/month at 1,000 messages
• Attentive: Custom; enterprise-level investment required

The cheapest raw per-message cost is Twilio at $0.0083, but only if you have a developer. The cheapest turnkey platform for 1,000 messages is SlickText or Salesmsg at $49/month flat.

Feature Gate Comparison

What this means: Ecommerce teams should focus on the left side of this table (Klaviyo, Postscript, Attentive, Omnisend). Sales teams should look at Salesmsg. General SMB campaigns fit SimpleTexting, EZ Texting, or SlickText. Developer teams use Twilio or TextMagic’s CPaaS integration.

Setup and Migration Difficulty

Which SMS Marketing Tool Should You Avoid?

Not every tool on this list is right for every buyer. Here are the mismatches I see most often:

• Avoid Attentive if you have fewer than 5,000 contacts and no enterprise budget. The custom pricing, sales-led onboarding, and feature depth are designed for brands doing $1M+ in annual revenue.
• Avoid Twilio if you do not have a developer on your team. Twilio is infrastructure, not a marketing tool. Buying Twilio without engineering is like buying a car engine without the car.
• Avoid Postscript if you do not sell on Shopify. The entire product is built around Shopify store data.
• Avoid Omnisend’s SMS if you are on the Free or Standard plan (new pricing, May 2026+). SMS now requires Pro at $59/month minimum.
• Avoid Salesmsg if you expect the $25/month Starter after your free trial ends. The trial auto-converts to Premium at $49/month.

How to Choose the Right SMS Marketing Platform

Use this 5-step framework to narrow your choice:

Step 1: Define your buyer type. Are you an ecommerce store, a local SMB, a sales team, or a developer team? This single answer eliminates half the list.

Step 2: Set your monthly message volume. Under 500 messages? SlickText or Salesmsg at $25–$29/month. 500–2,000? SimpleTexting or EZ Texting. 5,000+? Klaviyo, Postscript, or Attentive. Irregular senders? TextMagic pay-as-you-go.

Step 3: Check your integration requirements. Need Shopify integration? Postscript or Klaviyo. Need HubSpot or Salesforce? Salesmsg. Need API control? Twilio. Need email and SMS in one tool? Omnisend or Klaviyo.

Step 4: Calculate the real monthly cost, not the starting price. Add carrier fees, number rental, 10DLC registration, MMS premiums, and credit overage. Use the pricing comparison table above.

Step 5: Test before you commit. SimpleTexting, SlickText, Salesmsg, EZ Texting, and TextMagic all offer free trials. Use them. Send 50 real messages. Measure the workflow friction before signing an annual plan.

Common Mistakes When Choosing SMS Marketing Software

Mistake 1: Comparing starting prices without carrier fees. Every US SMS message carries an additional carrier surcharge. Platforms that show $0.01/SMS base rates look cheaper until you add the $0.003–$0.005 carrier fee per message.

Mistake 2: Ignoring 10DLC registration costs. US businesses sending A2P (application-to-person) messages need 10DLC registration. Some platforms include it; others charge $4–$15 for registration plus $10/month for campaign renewal.

Mistake 3: Choosing an ecommerce platform for a non-ecommerce use case. Postscript, Klaviyo, and Attentive are built for online stores. If you run a dental practice or a real estate office, SimpleTexting, EZ Texting, or SlickText will cost less and work better.

Mistake 4: Forgetting the SMS-to-credit conversion. Not every SMS is 1 credit. Messages over 160 characters consume 2 credits. MMS messages consume 2–3 credits. A 320-character promotional text with an image could cost 3–4 credits, not 1.

Mistake 5: Skipping the compliance check. TCPA, 10DLC, and opt-in/opt-out requirements are not optional. Platforms like Klaviyo, Postscript, Attentive, and SimpleTexting include compliance tools. If you use Twilio raw, you are responsible for building compliance yourself.

Mistake 6: Assuming the free trial represents the real experience. Several platforms offer generous trials that auto-convert to paid plans. Salesmsg’s trial auto-converts to $49/month (Premium), not the $25/month Starter. Know what you are signing up for.

Mistake 7: Not testing email automation workflows before adding SMS. If your email sequences are not working, adding SMS will not fix the problem. It will double the noise. Get your marketing automation foundation right first.

Final Verdict: Best SMS Marketing Platform for Most Teams

Klaviyo is the best overall SMS marketing platform in 2026 for ecommerce brands that want SMS, email, segmentation, automation, and customer data in one system. The free plan is a real starting point, the integration ecosystem is the largest on this list, and the platform depth supports growth from 250 contacts to enterprise scale.

Here is my recommendation by buyer type:

• Shopify ecommerce stores: Postscript. Purpose-built for Shopify with transparent per-message pricing.
• Enterprise DTC brands: Attentive. Multi-channel AI personalization, RCS, and enterprise support.
• Local SMBs sending under 2,000 texts/month: SimpleTexting. Clear pricing, easy setup, no ecommerce lock-in.
• First-time SMS marketers: EZ Texting. AI Compose, templates, and campaign calendar reduce the learning curve.
• Teams focused on growing their SMS list: SlickText. The opt-in toolkit (popups, QR codes, keywords, tap-to-join) is the strongest on this list.
• Budget ecommerce email + SMS: Omnisend. Free email plan plus SMS add-on from $0.007/SMS on Pro.
• Irregular senders (no monthly commitment): TextMagic. Pay-as-you-go at $0.049/SMS with no subscription.
• Sales and service teams: Salesmsg. Two-way SMS, calling, and CRM integrations with marketing automation tools at $25/month.
• Developer teams building custom workflows: Twilio. $0.0083/SMS API with full routing and compliance control.

The best SMS marketing platform is not the cheapest per text. It is the one whose billing model, compliance tools, automation depth, and integrations match your team’s exact workflow. Every platform above has a free trial or free plan. Use it before you decide.

If you are comparing SMS platforms alongside email marketing tools, check our Mailchimp pricing analysis and ActiveCampaign email review for side-by-side cost comparisons across both channels.

FAQ

WRITTEN BY

Sarah Chen

Marketing Technology Strategist at SaaS Zap with 7 years evaluating email marketing platforms, CRM-integrated campaign tools, and marketing automation software. Former digital marketing manager who has deployed Mailchimp, ActiveCampaign, HubSpot Marketing Hub, and Klaviyo for B2B and DTC brands. Tests every platform hands-on with real campaign workflows before publishing a review.

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