Clockwork SMS Alternatives

Brings voice and messaging to your web and mobile applications.

Open Source

Nexmo is a simple two way SMS API with global reach and wholesale rates

VoIPstudio is an award-winning VoIP system that offers businesses of all sizes a scalable communication solution. It’s inexpensive, easy-to-use, offers a full suite of PBX features, and is fully integrated for CRM.

Try for free paid Free Trial $4.99 / Monthly (User)

SMS messaging service provider offering two-way SMS communication services.

Plivo simplifies your customer engagement.

Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.

SMSAPI.com is browser platform for bulk SMS and other SMS marketing solutions.

Our company offers virtual phone numbers, toll-free numbers, PBX, SMS numbers and numbers for a registration more than 100 countries. Buy Now!

paid $5.0 / Monthly

SMPP SMSC simulator to test SMS messaging applications.

Open Source freemium

A low cost and reliable SMS API for developers

Textlocal is an app that allows for individual and group texting. It is designed for businesses that have employers and employees who need to communicate with each other, making it easier to announce group meetings and special announcements.

Next generation cloud communication platform that allows for the easy building of voice, video, and messaging applications.

Karix is a messaging and communication provider which helps in connectivity. Karix solutions provides messaging platform to marketing, voting of services.

LINK Mobility is Europe's leading provider within mobile communications, specialising in mobile SMS messaging, digital services and multi-channel conversational communication.