Esendex

Esendex has run a business messaging platform from Nottingham since 2001, now trading under Commify UK Limited as part of the wider Commify group. Its multichannel API covers SMS, WhatsApp, RCS, voice and email behind one integration, positioned — in its own words — as "built by developers, for developers", with two-way messaging and OTP authentication support alongside the send-and-track functionality most SMS platforms stop at.

Where Esendex stands out in this category is publishing its SMS pricing outright: Starter at £54 a month for 500 messages, Growth at £143 for 2,500, and Enterprise at £468 for 10,000, with API access included at every tier rather than reserved for a higher plan. WhatsApp, RCS, voice, email and anything past 10,000 messages a month moves to a custom quote, so the published numbers cover the entry point rather than the whole product.

The company is registered in England and Wales (Commify UK Limited, no. 04217280) and holds ISO 27001 accreditation for data security. As a UK entity, GDPR-equivalent processing continues under the UK's own regime and the EU's adequacy decision, though it sits outside the EU itself. A 7-day free trial with no commitment lowers the barrier to testing the API before any paid tier applies.

What Esendex does well

• Published tiered SMS pricing including API access
• Multichannel API: SMS, WhatsApp, RCS, voice, email
• ISO 27001 accreditation
• 7-day free trial, no commitment
• OTP and two-way messaging support

Where Esendex falls short

• United Kingdom sits outside the EU (adequacy decision)
• WhatsApp, RCS, voice and email pricing is custom
• Part of a multi-brand group (Commify), not a single-product focus
• Enterprise tier still requires a sales conversation past 10,000 messages

Standout feature. A published price for every SMS tier, API access included from the cheapest plan — most of this category makes you ask first.