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The Playground is a browser-based testing environment where you can simulate SMS messaging scenarios without sending real messages or incurring charges. It allows you to test both inbound and outbound message flows, validate webhook configurations, and debug your integration logic in real-time.
The Playground works exclusively with test applications and is completely free to use.

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What You Can Do

The Playground supports SMS messaging with the following capabilities:
  • Send test messages as a user to your application (inbound)
  • Send test messages from your application to simulated users (outbound)
  • View all messages in real-time
  • Test webhook delivery and payloads
  • Debug integration logic

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User and System Phone Numbers

The Playground simulates messaging scenarios using two types of phone numbers:

System Phone Numbers

Simulate messages from your application to external users (outbound messages). Use this to test:
  • Sending notifications
  • Alert systems
  • Two-way conversations

User Phone Numbers

Simulate messages from external users to your application (inbound messages). Use this to test:
  • Webhook handling for incoming messages
  • Auto-reply logic
  • Message processing workflows

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Moving to Production

To use your integration in production, replace your test API key (sk_test_app_*) with your live API key (sk_live_app_*). No other changes are required.
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