Sites and apps similar to Clockwork SMS include Telnyx. It's paid, but SMSGate App is free. Other options are Twilio, Vendel, SMSAPI and Hilos by ActiveCampaign. There's no shortage of Email Marketing Services like Clockwork SMS, with more than 50 alternatives for Android, iPhone, Mac, Windows and iPad.
All-in-one cloud communications platform and API with carrier-grade voice, data and messaging capabilities. Offers voice services such as Origination, Termination and SIP trunking over the Internet.
United States
Twilio is a web-service API that lets you use your existing web languages and skills to build voice and SMS applications. We focus on building a simple, powerful, pay-as-you-go communications platform so that you can focus on what you do best.
United States
Vendel is a full-stack platform for SMS management and delivery through connected devices. It allows sending SMS messages using registered devices (Android phones or modems) as gateways, with quota management, webhooks, and multi-user support.
Cuba
SMSAPI.com is browser platform for bulk SMS and other SMS marketing solutions. SMSAPI offers bulk SMS, MMS, voicemailing, HLR services, shortcode, SMS notifications, newsletter SMS, MMS coupons, mail2SMS, two-way SMS and other mobile services.
Czechia
EU
Platform for WhatsApp API that allows you Profile leads, automate follow-ups and integrate with your favorite tools to increase conversion.
textbee.dev is an open-source SMS gateway that enables users to send and receive SMS messages via a web dashboard or a REST API. Perfect for businesses, developers, and hobbyists who need a reliable and cost-effective way to automate SMS messaging.
Ethiopia
A secure, open-source solution for sending and receiving SMS messages via Android devices. No registration, email, or phone number required - just install and use.
This RESTful API is a modern API that lets you use the message services provided by iP.1 Networks AB via your own applications. Do everything from just sending SMS messages to managing contacts and sending surveys.
Plivo offers a simple, quick, and scalable way to modernize customer communications. Businesses of all sizes — from growing startups to public companies — rely on Plivo to deliver better customer experiences.
With Callr, never again suffer the business consequences of forcing your team and partners to stick to an obsolete call scenario hardwired into your communication system. Business teams can easily create advanced AI-powered call scenarios without technical skills, enjoying the...
United States
KAP Computer Solutions Pvt. Ltd., (KAPSYSTEM) pioneer in BULK SMS Solutions. KAPSYSTEM provides messaging and voice communications with comprehensive and customized platform for all businesses.
India
Sweden
