> ## Documentation Index > Fetch the complete documentation index at: https://docs.metar.ws/llms.txt > Use this file to discover all available pages before exploring further. # Plans & Limits > Compare Sandbox, Starter and Pro, and see how connections, channels and API keys are counted. | Plan | Price | Connections | Channels | API keys | Data | | ------- | ------------------------ | ----------- | -------- | -------- | ------------------------------------------------------------------ | | Sandbox | Free | 1 | 10 | 1 | `sandbox.demo` plus `metar.forecast.basic.*` (no measured weather) | | Starter | €49/mo, 7-day free trial | 2 | 10 | 1 | `metar.obs.` | | Pro | €199/mo | 10 | 1000 | 5 | Everything, including the `metar.atis.*` D-ATIS fast lane | The `ack` frame sent right after connecting always reports the effective limits of the account you just connected as. Read it at runtime rather than hardcoding this table, since limits can change. ## How channels are counted Channels are counted per account, not per connection. On Starter, ten channels is ten channels whether you open one connection or both; spreading subscriptions across several connections just splits the same budget. Unsubscribing from a channel, or closing a connection, hands its channels straight back. A single station can occupy up to three channels at once: `metar.obs.`, `metar.forecast.basic.` and `metar.forecast.hires.`. Starter's ten channels are enough for ten stations with one feed each, or five stations with both observations and forecasts. ## Changing plans Upgrades and cancellations are self-service from the portal's Billing page, backed by Stripe, and propagate to open connections within seconds. When a subscription ends, the account returns to Sandbox; existing keys keep working, scoped back to the demo channel. Contact [hello@metar.ws](mailto:hello@metar.ws) to discuss custom plans.