Best Transactional SMS Software in 2026
Updated
In short: ClickSend SMS API is ranked #1 of 77 as of 8 October 2026, ahead of Mailchimp and Bandwidth Messaging API. The best-ranked option with a free plan is Mailchimp. The lowest first paid tier on this page is Textmagic at $0.05/mo.
Transactional SMS software is for sending messages tied to events such as account activity or service updates. Compared on delivery status, two-way messaging, webhooks, and SMS API support, the entries can be assessed against your messaging workflow. Monthly message limits and pay-as-you-go availability help compare usage options; free-plan details and paid-from pricing add cost context. ClickSend SMS API and Mailchimp are among the named options, alongside Bandwidth Messaging API and Telnyx SMS API. Consider the volume and interaction your messages require when weighing these listed features.
77 transactional SMS software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
15 of the 25 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 1 | ClickSend SMS APIWeb · Mac · iPhone · API | Three bars | — | 3 of 6 | — | 6.5 | |
| 2 | MailchimpWeb · Android · iPhone | Three bars | — | 3 of 6 | Free | 6.5 | |
| 3 | Bandwidth Messaging APIWeb · API | Two bars | — | 1 of 6 | — | 6.4 | |
| 4 | Telnyx SMS APIWeb · API | Two bars | — | 1 of 6 | $500/mo | 6.4 | |
| 5 | TextmagicWeb · Android · iPhone · API | Three bars | — | 3 of 6 | $0.05/mo | 6.4 | |
| 6 | Bird VerifyWeb · API | Two bars | — | 1 of 6 | Free | 6.3 | |
| 7 | Clickatell SMS APIWeb · API | Two bars | — | 1 of 6 | Free | 6.3 | |
| 8 | GupshupWeb · API | Two bars | — | 1 of 6 | Free | 6.3 | |
| 9 | Infobip SMS APIWeb · API | Two bars | — | 1 of 6 | Free | 6.3 | |
| 10 | MessenteWeb · API | Two bars | — | 1 of 6 | Free | 6.3 | |
| 11 | Telnyx Text-to-Speech APIWeb · API | Two bars | — | 1 of 6 | $500/mo | 6.3 | |
| 12 | 2Factor.in OTP APIWeb | One bar | — | 1 of 6 | ₹4,999/mo | 6.2 | |
| 13 | Commio SMS APIWeb | One bar | — | 1 of 6 | — | 6.2 | |
| 14 | SMSPortalWeb | One bar | — | 1 of 6 | $0.08/mo | 6.2 | |
| 15 | TextbeltSelf-hosted · API | Two bars | — | 0 of 6 | Free | 6.2 | |
| 16 | MSG91Web · Android · iPhone · API | Two bars | — | — | 3 of 6 | — | 5.5 |
| 17 | Sinch Verification APIWeb · Android · iPhone · API | Two bars | — | — | 3 of 6 | — | 5.5 |
| 18 | BulkGateWeb · Android · API | One bar | — | — | 2 of 6 | — | 5.4 |
| 19 | MessageFlow SMS APIWeb · API | One bar | — | — | 1 of 6 | — | 5.4 |
| 20 | QuickAuth Transactional SMS APIWeb · Android · iPhone · API | Two bars | — | — | 3 of 6 | — | 5.4 |
| 21 | MobizonWeb · API | One bar | — | — | 1 of 6 | — | 5.3 |
| 22 | Routee SMS APIWeb · API | One bar | — | — | 1 of 6 | — | 5.3 |
| 23 | seven SMS Gateway APIWeb · API | One bar | — | — | 1 of 6 | — | 5.3 |
| 24 | SMSGlobal APIWeb · API | One bar | — | — | 1 of 6 | — | 5.3 |
| 25 | ValueFirst RCS Business MessagingWeb · API | One bar | — | — | 1 of 6 | — | 5.3 |
Compare all 25 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Pay-as-you-go | SMS API |
|---|---|---|---|---|---|---|---|---|
| 1 | ClickSend SMS API | 6.5 | No | — | No | — | Yes | Yes |
| 2 | Mailchimp | 6.5 | Free plan | Free | Yes | — | — | — |
| 3 | Bandwidth Messaging API | 6.4 | No | — | No | — | Yes | Yes |
| 4 | Telnyx SMS API | 6.4 | No | $500/mo | No | — | — | — |
| 5 | Textmagic | 6.4 | No | $0.05/mo | No | — | — | — |
| 6 | Bird Verify | 6.3 | Free plan | Free | — | — | — | — |
| 7 | Clickatell SMS API | 6.3 | Free plan | Free | — | — | — | — |
| 8 | Gupshup | 6.3 | Free plan | Free | No | — | — | — |
| 9 | Infobip SMS API | 6.3 | Free plan | Free | — | — | — | — |
| 10 | Messente | 6.3 | Free plan | — | No | — | — | — |
| 11 | Telnyx Text-to-Speech API | 6.3 | Free plan | $500/mo | No | — | — | — |
| 12 | 2Factor.in OTP API | 6.2 | Free plan | ₹4,999/mo | Yes | — | — | — |
| 13 | Commio SMS API | 6.2 | No | — | — | — | Yes | Yes |
| 14 | SMSPortal | 6.2 | Free plan | $0.08/mo | Yes | — | — | — |
| 15 | Textbelt | 6.2 | Free plan | Free | Yes | — | — | — |
| 16 | MSG91 | 5.5 | No | — | — | — | — | — |
| 17 | Sinch Verification API | 5.5 | No | — | — | — | Yes | Yes |
| 18 | BulkGate | 5.4 | No | — | No | — | Yes | Yes |
| 19 | MessageFlow SMS API | 5.4 | No | — | No | — | — | Yes |
| 20 | QuickAuth Transactional SMS API | 5.4 | No | — | — | — | — | Yes |
| 21 | Mobizon | 5.3 | No | — | — | — | Yes | Yes |
| 22 | Routee SMS API | 5.3 | No | — | — | — | Yes | Yes |
| 23 | seven SMS Gateway API | 5.3 | No | — | No | — | Yes | Yes |
| 24 | SMSGlobal API | 5.3 | No | — | No | — | — | — |
| 25 | ValueFirst RCS Business Messaging | 5.3 | No | — | — | — | — | — |
Is your app on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which transactional SMS software is ranked first on Freedom251?
ClickSend SMS API is ranked #1 of 77 with a score of 6.5. Mailchimp is second and Bandwidth Messaging API third.
How many of these have a free plan?
10 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Textmagic has the lowest first paid tier we found: $0.05/mo.
How is this list ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.