What it does
- Audience targeting lets you target user IDs or build audiences from device and user tags.
- Localization and scheduling let you include translated content and send at each recipient's local time.
- Custom data payloads open the right screen, with tags such as "new_comment" or "order_update".
- Recurring messages support a frequency limit per device and can be paused anytime.
- Delivery tracing follows each send from the queue to the provider response and shows errors when sends fail.
- An MCP integration gives a coding agent the docs and app context to configure the setup and guide device registration.
Pricing
The free tier covers up to 5,000 monthly reachable devices per organization, with no credit card required. Above that, it costs €9 per month plus €2.50 per 1,000 additional devices, prorated, with no per-message charges or monthly send quota.
Good to know
- SDKs are available for React Native, Swift, and Kotlin, plus a REST API.
- Hosted on Scaleway in Europe; delivery uses Apple's APNs and Google's FCM.
- Billing is per organization monthly via Stripe, and a card is only required beyond the free allowance.
Questions & answers
- What do I need to send a push?
- An iOS or Android app, an APNs key or Firebase service account, and a device registered through the SDK.
- Can I test without contacting Apple or Google?
- Test keys run the pipeline with a simulated provider response. Live keys require real credentials for real notifications.
- Where does Carillon run?
- Carillon is published by Exostack, a French company, and hosted on Scaleway in Europe. Delivery uses Apple's APNs and Google's FCM.
- How is billing handled?
- Usage is billed per organization monthly via Stripe. A credit card is only required when exceeding the free allowance.
In their words
Push notifications for developers.
One shared allowance of 5,000 monthly reachable devices across all your apps.