Kotzilla
Observability for Android and Kotlin Multiplatform apps, from the French team behind Koin, with an MCP server for AI fixes
Quick Overview
| Company | KOTZILLA SAS |
|---|---|
| Category | Error Tracking |
| Headquarters | Toulouse, France |
| EU Presence | EU (France) |
| Data Location | Hosted in the United States by default; hosted in the European Union where the Order Form provides for it (Enterprise lists USA or Europe) |
| Open Source | No |
| Pricing | Starter: free, no payment details required, 500k events (about 250 user sessions), 1 user, unlimited applications monitored, 15 days storage, hosted in the USA, community support. Enterprise: custom pricing, unlimited users, events as requested, 30 to 120 days storage, hosting in the USA or Europe, dedicated support channels optional. Student and teacher plan: free (EUR 0). |
| Free Option | Free Starter plan with no payment details required |
| Replaces | Firebase Crashlytics, Firebase Performance Monitoring |
Detailed Review
Kotzilla is an observability platform for Android and Kotlin Multiplatform apps, built by KOTZILLA SAS in Toulouse, France. The team is also behind Koin, the Kotlin dependency injection framework, and the platform uses Koin's instrumentation to capture component resolution, timing and scopes without manual traces.
Crash reporting covers Android and Kotlin Multiplatform targets, including iOS with desymbolicated stack traces. Next to crashes it detects ANRs, slow startups, frozen screens and thread-blocking components, and shows them on a session timeline with memory and thread metrics.
The distinguishing part is the MCP server. Claude Code, Cursor and other AI coding assistants can query Kotzilla for the root cause of an issue and apply a fix. The Starter plan is free with 500k events, one user and 15 days of storage.
What Kotzilla does well
- Built by the team behind Koin, so Koin apps need little extra instrumentation
- Crash reporting and performance data share one session view
- MCP server connects AI coding assistants to production issues
- Free Starter plan with no payment details required
- French contracting entity with a GDPR-based privacy policy
Where Kotzilla falls short
- Narrow scope: Android and Kotlin Multiplatform only, no web or backend errors
- Data is hosted in the United States by default; EU hosting is arranged through the Order Form
- Starter is limited to one user and 15 days of storage
- No published prices for paid plans, Enterprise is on request
Standout feature. Kotzilla ties crashes and slow screens to the Koin dependency graph and exposes that context to AI assistants through an MCP server.
Pros and Cons
Pros
- Built by the team behind Koin, so Koin apps need little extra instrumentation
- Crash reporting and performance data share one session view
- MCP server connects AI coding assistants to production issues
- Free Starter plan with no payment details required
- French contracting entity with a GDPR-based privacy policy
Cons
- Narrow scope: Android and Kotlin Multiplatform only, no web or backend errors
- Data is hosted in the United States by default; EU hosting is arranged through the Order Form
- Starter is limited to one user and 15 days of storage
- No published prices for paid plans, Enterprise is on request
Alternatives to Kotzilla
Frequently Asked Questions
What is Kotzilla?
Kotzilla is an observability platform for Android and Kotlin Multiplatform apps, built by KOTZILLA SAS in Toulouse, France. The team is also behind Koin, the Kotlin dependency injection framework, and the platform uses Koin's instrumentation to capture component resolution, timing and scopes without manual traces.
Where is Kotzilla based?
Kotzilla operates from Toulouse, France, which places it under EU (France).
What does Kotzilla cost?
Starter: free, no payment details required, 500k events (about 250 user sessions), 1 user, unlimited applications monitored, 15 days storage, hosted in the USA, community support. Enterprise: custom pricing, unlimited users, events as requested, 30 to 120 days storage, hosting in the USA or Europe, dedicated support channels optional. Student and teacher plan: free (EUR 0).. Free Starter plan with no payment details required.
Who is Kotzilla best for?
Android and Kotlin Multiplatform teams using Koin. Kotzilla ties crashes and slow screens to the Koin dependency graph and exposes that context to AI assistants through an MCP server.
What are the drawbacks of Kotzilla?
Narrow scope: Android and Kotlin Multiplatform only, no web or backend errors. Data is hosted in the United States by default; EU hosting is arranged through the Order Form. Starter is limited to one user and 15 days of storage. No published prices for paid plans, Enterprise is on request.
Is Kotzilla a good alternative to Firebase Crashlytics?
Kotzilla is built as a European alternative to Firebase Crashlytics: Observability for Android and Kotlin Multiplatform apps, from the French team behind Koin, with an MCP server for AI fixes. It will not be a like-for-like feature match in every respect, so check the review above for where the two genuinely differ before switching.
How does Kotzilla compare to other Error Tracking tools?
Kotzilla is one of several European Error Tracking tools we cover. It is most often compared with Firebase Crashlytics, Firebase Performance Monitoring.