Case Study
HK Relay SMS Gateway
Android app that turns any phone into an SMS gateway with REST API and webhook support.
Direct ClientPersonal ProductJanuary 2026
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Android app that turns any phone into an SMS gateway with REST API and webhook support.
HK Relay solves a simple problem - sending SMS from web applications without expensive SMS gateways. Just use an old Android phone.
The app exposes a REST API for sending messages and supports webhooks for delivery reports and incoming messages. Built with Kotlin and Ktor for the embedded HTTP server.
Includes queue management for handling high volumes and retry logic for failed messages.
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Start a ConversationBuilt with excellence in mind
Optimized for speed & scalability
Battle-tested with real users
Responsive across all devices
Maintainable & well-documented
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