Communication API providers

• SendPulse

  82.0rating

  SendPulse Inc., a New York company founded in 2015, sells transactional email through an SMTP relay and API, SMS and WhatsApp Business API alongside marketing email, chatbots and a CRM. The SMTP service has a free plan of 12,000 emails a month; SMS is prepaid per message; WhatsApp needs a paid chatbot plan plus per-template fees. Prices follow the visitor's location.

  7 channel groups

• Telnyx

  80.8rating

  Telnyx, based in Austin, sells SMS and MMS through its Messaging API, one-time codes through Telnyx Verify, WhatsApp messaging as a WhatsApp BSP and transactional email through an Email API that is in beta. All four are billed pay-as-you-go in USD, with a $5 trial credit and no free-forever tier.

  6 channel groups

• Brevo

  76.4rating

  Brevo (legal entity Sendinblue SAS, Paris) sells transactional email through its API and SMTP relay inside plans priced by monthly email volume, with a free plan of 300 emails a day. SMS and WhatsApp are sold as prepaid credits priced per destination country; WhatsApp credits require the Professional plan.

  6 channel groups

• Bird

  76.3rating

  Bird, formerly MessageBird and based in Amsterdam, sells a transactional email API on monthly volume plans, pay-as-you-go SMS, WhatsApp messaging priced per message with Meta's fee included, and Bird Verify, which bills one-time codes at the delivering channel's rate. Prices are published in USD, and a free email plan covers 1,000 emails a month.

  7 channel groups

• Vonage

  74.4rating

  Vonage, an Ericsson subsidiary headquartered in New Jersey, sells SMS through its SMS and Messages APIs, one-time codes through the Verify API and WhatsApp through the Messages API. Usage is prepaid or invoiced in EUR or USD after a free trial credit, with no free-forever messaging tier.

  5 channel groups

• Infobip

  73.3rating

  Infobip, a CPaaS company registered in London with Croatian origins, sells SMS, a 2FA API for one-time codes, WhatsApp Business messaging and transactional email from one prepaid account. SMS and WhatsApp rates are published per country and email at one worldwide rate; the 2FA service has no published price. New accounts start with a 60-day trial.

  8 channel groups

• Mailtrap

  72.6rating

  Mailtrap, a product of the US company Railsware Products Studio LLC, sends transactional and bulk email through a REST API and SMTP and receives inbound email; its Email Sandbox for testing is priced separately. Sending plans are monthly USD subscriptions by volume, with a free-forever tier of 4,000 emails a month capped at 150 a day.

  1 channel group

• Sinch

  72.4rating

  Sinch, a Stockholm-based group, sells SMS, WhatsApp and other channels through its Conversation API and one-time codes through its Verification API. SMS rates are published per country with a prepaid self-serve account, while WhatsApp needs a postpay account arranged through Sinch.

  7 channel groups

• Mailgun

  71.2rating

  Mailgun, a Sinch company based in San Antonio, Texas, sells transactional email through Mailgun Send: a REST API and SMTP relay with inbound routing, templates and signed webhooks, hosted in a US or an EU region. Paid plans are monthly subscriptions with included volume and per-1,000 overage; the Free plan allows 100 emails per day.

  1 channel group

• Amazon SES

  70.7rating

  Amazon Simple Email Service (SES) is the Amazon Web Services email service for sending through an HTTPS API or an SMTP interface and for receiving email on your own domains. Sending is billed per recipient in USD, either à la carte or on Essentials, Pro and Enterprise plans, and no always-free email quota is published.

  7 channel groups

• Resend

  68.8rating

  Resend, operated by the US company Plus Five Five, Inc., sells transactional email through a REST API and an SMTP relay, plus contact-based marketing email. Plans are monthly USD subscriptions with a free-forever tier of 3,000 emails a month, capped at 100 a day, and no free trial.

  1 channel group

• Twilio

  68.2rating

  Twilio, based in San Francisco, sells SMS and MMS through Programmable Messaging, one-time codes through Twilio Verify and WhatsApp messaging through the Twilio API for WhatsApp. All three are billed pay-as-you-go in USD, with a 30-day trial and no free-forever messaging tier.

  5 channel groups

• AWS End User Messaging

  68.0rating

  AWS End User Messaging is the Amazon Web Services messaging service for SMS, MMS, RCS and voice (with Notify and an OTP API for one-time passcodes) and for WhatsApp through End User Messaging Social. Usage is billed pay-as-you-go in USD per message, and no free-forever messaging tier is published.

  7 channel groups

• SMTP2GO

  67.7rating

  SMTP2GO, run by Sand Dune Mail Ltd in Christchurch, New Zealand, relays application email over SMTP and a REST API from US, EU and Australian data centers, and sells SMS as a paid add-on. Email plans are monthly or annual USD subscriptions with included volume and per-1,000 overage; the Free plan allows 1,000 emails a month.

  2 channel groups

• WATI

  65.9rating

  WATI, a product of Hong Kong-based Clare.AI Limited, is a WhatsApp Business API platform with a shared team inbox, no-code chatbots, campaigns and a REST API. It sells Growth, Pro and Business subscriptions (USD in the US, BRL in Brazil, MXN in Mexico) and charges WhatsApp messages from a prepaid credit wallet at rate-card prices that include Meta's fee.

  3.5 channel groups

• Mailjet

  65.8rating

  Mailjet, a Sinch company based in Paris, sells transactional email through the Send API and an SMTP relay next to a marketing email platform, with customer data hosted in the EU. Plans are monthly subscriptions in USD, EUR or GBP with included volume and per-1,000 overage; the Free plan allows 6,000 emails a month, capped at 200 a day.

  1 channel group

• Textmagic

  65.8rating

  Textmagic (Textmagic Limited, UK; parent TextMagic AS, Tallinn) sells a business texting platform with an SMS REST API, email campaigns and a shared inbox. SMS is prepaid pay-as-you-go in USD, EUR, GBP or AUD. Textmagic states that sending is regional, WhatsApp is inbound-only and there is no OTP API.

  5 channel groups

• 360dialog

  59.0rating

  360dialog, a German company that states it is an official Meta Business Solution Provider, sells access to the WhatsApp Business Platform through its Messaging API and Hub. Each phone number pays a monthly licence from $59; Meta's per-message fees are passed through with no 360dialog per-message fee. A free sandbox allows 200 test messages to your own number.

  2.5 channel groups

• Botmaker

  57.8rating

  Botmaker, founded in Argentina in 2016, sells a conversational platform with WhatsApp Business Platform access, AI agents, a live-chat desk, SMS and e-mail channels and a REST API. Plans are priced per conversation (daily user): Standard costs $149 per month in USD and R$600 in Brazil, with WhatsApp's own fees billed on top.

  7 channel groups

• ClickSend

  57.5rating

  ClickSend, an Australian company in the Sinch group, sells SMS, MMS and RCS through a REST API and a web dashboard. Credit is prepaid: the SMS rate depends on the destination country and on the size of the last top-up (Boost, Growth, Scale and Enterprise tiers). New accounts get a 14-day trial with AUD 2 of credit; email and voice are closed to new customers.

  1 channel group

• Gupshup

  57.1rating

  Gupshup sells WhatsApp Business API access as a Meta Solution Partner, through a self-serve platform billed from a prepaid USD wallet and through a partner portal for software vendors. The self-serve price list charges $0.001 per message on top of Meta's fee. One-time codes go out as WhatsApp authentication templates. Gupshup also sells SMS, RCS and voice, with no public price list.

  6 channel groups

• Postmark

  55.6rating

  Postmark, owned by ActiveCampaign, sends and receives application email through a REST API and SMTP, with separate transactional and broadcast message streams. Plans are monthly USD subscriptions with included volume and per-1,000 overage, plus a free developer plan of 100 emails a month.

  1 channel group

• Blip

  55.5rating

  Blip (Curupira S.A., Belo Horizonte, formerly Take Blip) sells a conversational platform: WhatsApp Business API access as a Meta partner, a visual bot builder, AI agents, a human-agent desk and SMS. Platform plans are sold by contract in BRL; Blip Go, a WhatsApp plan for small businesses, is listed at R$389 per month on the Portuguese page (R$299 in the Help Center) with a 15-day trial.

  6 channel groups

• Zenvia

  53.9rating

  Zenvia, a Brazilian company based in São Paulo, sells WhatsApp, SMS, RCS, e-mail and a two-factor authentication API through Zenvia Customer Cloud. Plans combine a software plan with a monthly channel package priced in BRL in Brazil and in MXN in Mexico; Brazilian customers pay by card or boleto.

  7 channel groups

• Twilio SendGrid

  52.1rating

  Twilio SendGrid, owned by Twilio since 2019, sends transactional email through the v3 Mail Send API and an SMTP relay on monthly plans that start at $19.95 for 50,000 emails. New accounts get a 60-day free trial capped at 100 emails a day; there is no free-forever Email API plan.

  1 channel group

• Plivo

  49.7rating

  Plivo, based in Austin, Texas, sells SMS and MMS through its Messaging API, one-time codes through Plivo Verify and WhatsApp messaging as a Meta BSP. All three are sold to direct brands through sales on an Enterprise plan with a USD 1,000 minimum monthly commitment; list rates are published in USD.

  5 channel groups

• Treble

  33.2rating

  Treble (Treble.ai, Inc., incorporated in Delaware) is a Meta WhatsApp Business Solution Provider focused on Latin America. Its WhatsApp-only platform combines a no-code flow builder, AI agents, a shared agent inbox, CRM integrations and a small REST API. The base plan starts at USD 399 per month; volumes and final fees are agreed with sales.

  2 channel groups