Comparison
Fonsitor vs Kotzilla
Honest comparison -- when to choose each
Feature Matrix
Side by side
Both are built for Kotlin developers. The philosophy and cost model differ.
| Feature | Fonsitor | Kotzilla |
|---|---|---|
| Price | Free (open source) | Free trial; paid from $49/mo |
| Target platform | KMP: Android, iOS, Desktop, Server | KMP: Android, iOS, Desktop, Web (JS/WASM) |
| Self-hosted | Yes -- full self-hosted option | No -- cloud only |
| DI framework integration | Framework-agnostic | Deep Koin integration (auto instrumentation) |
| Crash reporting | Yes -- exceptions, stack traces, breadcrumbs | Yes -- including iOS via PLCrashReporter (beta) |
| Performance monitoring | Basic timing metrics | ANR, slow components, startup P50/P95, screen ranking |
| Compose performance | Manual event tracking | Automatic Compose event visibility |
| AI-powered insights | No | Contextual AI prompts, AI-native analysis |
| Dashboard | Self-hosted web UI | Cloud dashboard with health metrics |
| SDK size overhead | Lightweight (~50 KB) | Moderate (Koin instrumentation layer) |
| Setup complexity | Single Gradle dependency | Gradle plugin + Koin config |
| Data ownership | Full -- self-host, export anytime | Cloud-managed by Kotzilla |
| Enterprise customers | Indie / small teams | Canal+, TotalEnergies, Volkswagen, Decathlon |
| Open source | Yes | No (proprietary) |
When to choose
Different tools, different strengths
The right choice depends on your budget, scale, and DI framework.
Choose Fonsitor when...
- You want free, open-source error monitoring with no event caps
- Data ownership and self-hosting are non-negotiable
- You use any DI framework (Koin, Hilt, Kodein, or none)
- A minimal SDK footprint matters for your app size budget
- Your needs are focused on crash and error tracking
- You prefer simplicity -- one dependency, works out of the box
Choose Kotzilla when...
- You use Koin and want automatic DI instrumentation
- You need deep Compose performance profiling (ANR, slow screens)
- AI-powered insights and contextual analysis are valuable to your team
- You need a managed cloud dashboard with enterprise SLAs
- Startup performance (P50/P95 tracking) is a priority
- You want iOS crash reporting alongside Android in one SDK
Kotlin error monitoring. Free. Open source.
Add Fonsitor to your KMP project with a single Gradle dependency.