Unitpost vs Vonage for SMS

Vonage is Ericsson's communications API business, with a Messages API for SMS, MMS, RCS, WhatsApp, Messenger and Viber, plus voice, video and verification. Unitpost sends SMS to 177 countries from the same API, contacts and bill as its email, on paid plans from $10 a month. Across 12 compared capabilities, Unitpost leads on 6 and Vonage leads on 6.

Comparing more than two? Best Vonage alternatives in 2026, ranked with published weights.

Which should you choose?

Choose Vonage if

You need RCS, WhatsApp, Messenger or Viber with failover to SMS
You want one-time codes managed for you, including silent authentication
You need short codes or an enterprise contract

Choose Unitpost if

You want STOP handling, consent records and quiet hours on from day one, not switched on yourself
You want contact lists, segments and scheduled campaigns for texts
You want self-serve email and SMS on the same contacts and bill
You want idempotent sends and a hosted MCP server

What Vonage does well

Stated plainly, because a comparison that pretends otherwise is not worth reading.

One Messages API across SMS, MMS, RCS, WhatsApp, Messenger and Viber, with automatic failover between channels
A large carrier network, with 1,600+ direct and tier-1 connections
Verify over SMS, voice, email, WhatsApp and silent authentication
Every US sender type, including short codes

Pricing and free tier

Unitpost: $0.014 per US text, and a published price for each of 177 countries; SMS is on paid plans from $10 a month, which includes $10 of monthly sending allowance for texts or email. Number and carrier registration fees are passed through at cost.
Vonage: No free tier. €2 of test credit in demo mode, to up to 10 numbers, with a demo notice on every text; Pay as you go per message, with US carrier fees passed through on top and volume discounts through sales.

Vonage pricing and free-tier details last verified 2026-11. Providers change these often — check their pricing page before making a decision.

Feature comparison

Feature and pricing comparison between Unitpost and Vonage
Capability	Unitpost	Vonage
Monthly minimum	A paid plan from $10 a month, which includes $10 of sending allowance for texts or email	None. Pay as you go
Channels	SMS and email	SMS, MMS, RCS, WhatsApp, Messenger and Viber in one API, with failover
Sender types	Toll-free and 10DLC numbers in the US, local numbers in Canada, Sender IDs where a country allows them	10DLC, toll-free, short codes and Sender IDs
Email	Transactional, marketing and inbound email, self-serve, on the same contacts and bill	An email channel in open beta since June 2026, for customers onboarded by an account manager
Marketing text compliance	Enforced on every send: consent on record per contact, recipient-local quiet hours for marketing, STOP and HELP handled, double opt-in by text, a content check before a sender's first send	STOP and HELP handling (Opt-Out Assist) has to be turned on; consent records and quiet hours are left to you
Contacts, segments and campaigns	SMS templates, topics, segments and scheduled campaigns in the product, shared with email	No contact lists or campaigns since Proactive Connect was retired, and no send-time field
Two-way texting	Replies to numbers in the United States and Canada arrive as an sms.received webhook, 1¢ per received text	Inbound messages to your application's webhook
One-time codes	Send codes through the SMS or email API and check them yourself. No managed verification API	Verify over SMS, voice, email, WhatsApp and silent authentication, priced per success
Idempotent sends	Idempotency-Key on sends, 24-hour dedupe window, on SMS as on email	No idempotency key; a client reference is echoed in status updates
SMS pumping protection	On by default: texts reach only the countries we offer, with fraud filtering and per-workspace limits on new destinations	Fraud Defender Standard is free; inflated-traffic protection and per-country limits need the paid Advanced tier
MCP server for AI agents	Hosted, with every SMS and email operation as a tool and OAuth sign-in	A hosted docs server, and a tooling server that sends messages but that you run yourself
Track record	New. SMS has been in production since October 2026	Years of production messaging, owned by Ericsson since 2022

How do I switch from Vonage?

There is no one-key import from Vonage, and Unitpost doesn't port numbers in. You get new numbers or Sender IDs, and in the US you register your brand and campaign with Unitpost (10DLC or toll-free verification), which the carriers review before you can send.

Import your contacts with their phone numbers and record the consent you already hold, opt-outs included, so nobody who texted STOP to your Vonage number hears from the new one.

Then change the send call to POST /sms and point delivery callbacks at Unitpost webhooks (sms.sent, sms.delivered, sms.failed; replies arrive as sms.received). Keep Vonage sending until the new sender is approved and live.

Read the SMS docs

Frequently asked questions

Does Vonage handle STOP replies automatically?

Not by default. Vonage's Opt-Out Assist handles STOP and HELP once you turn it on (free for 10DLC, a monthly fee for short codes), and US carriers enforce STOP on toll-free numbers themselves. On Unitpost, STOP and HELP are handled on every send, and marketing texts also need consent on record and respect the recipient's quiet hours.

Does Vonage have SMS campaigns?

Not any more. Vonage retired Proactive Connect, its lists and campaigns product, and the Messages API has no send-time field. Unitpost has SMS templates, topics, segments and scheduled campaigns on every paid plan.

Switching from Vonage?

Start with email on the free tier

Then add SMS on any paid plan from $10 a month, on the same API key and contacts.

Start for free Explore the docs