How we make this list: we compare pricing pages, product documentation and public user reviews. Rankite is independent; if a vendor ever pays for a featured spot, that listing is clearly labeled Partner.
Key takeaways
- Ecommerce brands choosing between Attentive and Postscript are really choosing between a full lifecycle platform and a Shopify-native specialist; both win on revenue per message, not on sticker price.
- If SMS is one channel among many, Klaviyo's combined email-plus-SMS billing is usually cheaper than two separate tools.
- Small and local businesses should compare SimpleTexting, EZ Texting, Textedly and SlickText on message volume pricing and 10DLC compliance support, not on enterprise features they will never use.
- Developers building custom messaging should start with Twilio's API, not a marketing platform; the use cases barely overlap.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 Attentive | Enterprise ecommerce brands running SMS as a lifecycle channel | See website | No |
 Postscript | Shopify brands that want SMS-first revenue | See website | Free trial |
 Klaviyo | Brands that want email and SMS in one bill | See website | Yes |
 SimpleTexting | Small businesses that need straightforward mass texting | See website | Free trial |
 EZ Texting | Teams that want AI help with texting workflows | See website | Free trial |
 Textedly | Businesses that want transparent pricing and no contracts | See website | Free trial |
 SlickText | Growing businesses that want a full SMS feature set | See website | Free trial |
 Twilio | Developers building messaging into products | See website | Free trial |
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Text messages get opened. That single fact keeps SMS the highest-engagement channel in marketing, and the reason carriers and regulators wrapped it in compliance rules (10DLC registration, opt-in management, quiet hours). The platform you pick determines whether SMS becomes a revenue engine or a compliance headache. Eight platforms, from enterprise ecommerce to developer APIs.
#1
Attentive
Best for: Enterprise ecommerce brands running SMS as a lifecycle channel
Visit attentive.com
Starting priceSee website
Free planNo
Attentive is the enterprise standard for ecommerce SMS. It treats texting as a full lifecycle channel: list growth with compliant capture, segmented campaigns, automated journeys for abandonment and winback, and reporting that ties messages to revenue. The integration library is the moat; your Shopify, ESP and loyalty data all feed the same segmentation engine.
The honest catch is the commercial model. Custom pricing and annual contracts are built for brands doing serious SMS volume, and small businesses will find the cost impossible to justify. If you are an enterprise retailer where SMS drives eight figures, Attentive's ROI case is well documented. Everyone else should keep scrolling.
What we like- Deep ecommerce integrations (100-plus, including Shopify and Salesforce)
- Strong segmentation and journey orchestration
- Proven revenue results at enterprise scale
Watch out for- Custom pricing means a sales process before you can budget
- Overkill and overpriced for small lists
Starting priceSee website
Free planFree trial
Postscript is the SMS platform Shopify brands graduate to when Klaviyo's SMS feels like an add-on. Everything is built around the Shopify data model: product events, checkout behavior and customer history drive segmentation and flows without custom integration work. Its benchmarks on revenue per message and list growth are the numbers the category measures itself against.
The boundary is the ecosystem. On Shopify it is superb; off Shopify it is a harder sell. Pricing also deserves a careful read at volume, since SMS costs scale with sending. For Shopify-first DTC brands, though, Postscript versus Attentive is the real decision, and Postscript usually wins on focus and Shopify depth.
What we like- Shopify-native depth that generic platforms cannot match
- Strong automation for carts, browse abandonment and post-purchase
- Transparent focus on revenue per subscriber
Watch out for- Shopify-centric, a weaker fit outside that ecosystem
- Pricing conversations still needed at scale
Starting priceSee website
Free planYes
Klaviyo's argument is consolidation: your email and SMS programs share one customer profile, one segmentation engine and one flow builder. A welcome series can email first and text the non-openers; a winback can pick the channel per customer. For brands already on Klaviyo for email, adding SMS is nearly frictionless, and the free tier makes the experiment cheap.
The trade-off is depth. Dedicated SMS platforms go further on conversational commerce, advanced compliance tooling and SMS-specific analytics. Heavy SMS senders should price Klaviyo's per-credit SMS against Postscript or Attentive before assuming consolidation is cheaper. For most mid-size brands, though, one platform beats two.
What we like- One platform, one subscriber profile for email and SMS
- Flows can mix channels intelligently
- Free tier lets small brands start texting cheaply
Watch out for- SMS features trail the dedicated SMS platforms in depth
- Combined billing still charges per SMS credit, so heavy texters may pay more
Starting priceSee website
Free planFree trial
SimpleTexting is the anti-enterprise option: no sales call, no annual contract maze, just a platform that sends texts well. Small businesses use it for promotions, reminders, alerts and two-way customer conversations. The keyword and autoresponder features handle the classic use cases (text JOIN to 12345), and the API covers the integrations most small teams need.
It will not run your lifecycle marketing. There is no deep Shopify event modeling and no AI journey orchestration. But most local businesses do not need those; they need reliable delivery, simple compliance and a price they can predict. SimpleTexting delivers exactly that.
What we like- Clean interface that non-marketers learn in an afternoon
- Two-way messaging, keywords and autoresponders cover the essentials
- Solid API for light integrations
Watch out for- Lacks the ecommerce automation depth of Attentive or Postscript
- Advanced segmentation is basic
Starting priceSee website
Free planFree trial
EZ Texting has been in the SMS business longer than most competitors, and the feature list shows it: mass texting, MMS, two-way messaging, polls, keywords, integrations and now AI-assisted drafting and workflows. It serves the middle well: businesses too big for the simplest tools but not running enterprise ecommerce programs.
The honest critique is focus. EZ Texting does many things adequately and few things exceptionally; ecommerce brands will find Attentive or Postscript sharper, and developers will find Twilio more flexible. But as a general-purpose business texting platform with AI help baked in, it is a solid, proven choice.
What we like- Long-established platform with broad feature coverage
- AI-assisted features for message creation and workflows
- Handles both marketing and operational texting
Watch out for- Interface and pricing tiers can confuse first-time buyers
- Enterprise ecommerce features lag the category leaders
#6
Textedly
Best for: Businesses that want transparent pricing and no contracts
Visit textedly.com
Starting priceSee website
Free planFree trial
Textedly's pitch is radical transparency in a category famous for custom quotes. Published plans, every feature on every tier, month-to-month billing and support from real humans around the clock. For a small business owner comparing SMS tools at midnight, that clarity is a genuine differentiator, and the feature set (mass SMS and MMS, drip campaigns, two-way texting, text-to-pay) covers the real use cases.
The ceiling is lower than the enterprise platforms. You will not get Attentive-level journey orchestration or Postscript-level Shopify modeling. Textedly knows its customer: the business that wants to start texting this week, understand the bill, and cancel if it does not work. For that buyer, it is one of the best options available.
What we like- Published pricing starting at $29/month with no long-term contracts
- Every feature included on every plan
- 24/7 human support and day-one onboarding
Watch out for- Fewer advanced ecommerce automations than the specialists
- The simplicity that small teams love limits large-scale sophistication
Starting priceSee website
Free planFree trial
SlickText sits between the simple tools and the enterprise platforms. Its feature list is one of the longest in the category: mass texting, MMS, drip campaigns, text-to-win contests, loyalty programs, surveys, Facebook tools and a real API. Growing businesses that want room to expand without switching platforms find a lot to like.
The complexity cuts both ways. Teams that just need appointment reminders will find simpler tools faster to learn. And like all SMS platforms, the real cost is in message volume, so model your sending honestly. For businesses planning to make SMS a serious channel, SlickText's depth gives it longevity.
What we like- Deep feature set including loyalty, contests and surveys
- 7,000-plus integrations via Zapier
- Established since 2012 with a strong support reputation
Watch out for- Pricing tiers reward volume commitments
- The breadth of features can overwhelm simple use cases
Starting priceSee website
Free planFree trial
Twilio is the odd one out, deliberately. It does not offer campaigns, segments or drag-and-drop journeys; it offers APIs that let developers send and receive messages programmatically. Product teams use it for OTP codes, appointment reminders, delivery notifications and custom messaging products. The deliverability infrastructure and global reach are the reasons serious products build on it.
The honest framing: if you have marketers who want to send campaigns, Twilio is the wrong tool and will frustrate everyone. If you have engineers building messaging into software, the marketing platforms are the wrong tools. Buy infrastructure for product use cases and platforms for marketing use cases, and do not confuse the two.
What we like- Programmable Messaging API for SMS, MMS and WhatsApp
- Global carrier relationships and deliverability infrastructure
- Usage-based pricing with no platform fee
Watch out for- It is infrastructure, not a marketing tool: no campaigns UI, no templates, no marketer-friendly workflows
- You build everything yourself
How we chose
We compared platforms across the real SMS use cases: ecommerce lifecycle marketing, small-business mass texting, multi-channel consolidation and developer infrastructure. We weighed compliance support (10DLC, opt-in management), pricing transparency, integration depth, free-trial availability and how honestly each vendor fits its target buyer. Pricing comes from each vendor's own pricing page; where plans were not verifiable we used "See website." No hands-on testing was performed.
What to look for before you buy
Start with compliance, not features. US carriers require 10DLC registration for application-to-person texting, with opt-in proof and quiet-hour rules. Ask each vendor exactly what they handle versus what falls on you; the wrong answer here costs fines, not just fees.
Price your real volume. SMS pricing is per message (or per credit), so a 50,000-subscriber list sending weekly costs dramatically more than the plan's headline price suggests. Get the all-in monthly number for your list size and cadence in writing.
Match the platform to your stack. Shopify brands get the most from Postscript and Attentive; Klaviyo users should price its SMS before adding a second tool; everyone else should weight simplicity and support over enterprise features.
Finally, check the list-growth tooling. The best SMS program is worthless without subscribers; compare each platform's popups, keywords and checkout capture before you compare their campaign builders.
Frequently asked questions
How much does SMS marketing cost?
It depends on list size and volume. Entry plans start around $29/month for small lists, while enterprise ecommerce platforms price on custom quotes. The real cost driver is per-message sending, so model your list size times your monthly cadence.
Is SMS marketing legal?
Yes, with consent. US law (TCPA) requires express opt-in, carriers require 10DLC registration, and quiet hours apply. Every legitimate platform enforces opt-in management; avoid any tool that does not.
What is 10DLC and why does it matter?
10DLC is the carrier framework for business texting from standard 10-digit numbers. Registration verifies your business and use case, which improves deliverability and keeps you compliant. Unregistered traffic gets filtered or blocked.
What is a good open rate for SMS?
SMS open rates are famously high, often cited around 98 percent, because texts land on the lock screen. Click-through and conversion rates vary by offer and list quality; benchmark against your own history, not industry averages.
Should I use Klaviyo SMS or a dedicated platform?
If email and SMS share strategy and budget, Klaviyo's consolidation usually wins on simplicity and cost. If SMS is a major revenue channel on Shopify, a dedicated platform (Postscript, Attentive) typically earns more per message.
Can I send SMS internationally?
Most platforms support international sending with varying coverage and pricing. Confirm your target countries and per-message rates before committing, since international SMS costs far more than domestic.
Sources we checked (9)
- https://www.attentive.com
- https://www.postscript.io
- https://www.klaviyo.com
- https://www.simpletexting.com
- https://www.eztexting.com
- https://www.textedly.com
- https://www.slicktext.com
- https://www.twilio.com
- https://adtools.org/buyers-guide/attentive-vs-simpletexting-vs-slicktext-vs-postscript-sms-marketing-buyer-s-guide-2
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has spent more than a decade helping SaaS and e-commerce brands grow through search. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.