What are some alternatives?
When comparing BulkSMS and Clockwork SMS, you can also consider the following products
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Twilio - Brings voice and messaging to your web and mobile applications.
Infobip - A2P messaging platform for enterprises, resellers & mobile operators with global network coverage.
Textlocal - 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.
Avochato - Text messaging for your business.
Plivo - Plivo's Voice API enables businesses to build Voice apps to reach customers globally in 200+ countries. Try Plivo's Voice API for free. Instant Sign Up.