Sentry is the default for web error tracking with 30+ SDKs and self-hosting. Highlight.io, Bugsink, and Firebase Crashlytics fill the open-source, lightweight self-hosted, and free mobile niches. Here's how they compare.
Every production web app ships bugs — the question is how fast you find out and whether you can pinpoint the exact line of code. Error tracking tools capture stack traces, group duplicate errors, and alert your team in real time. This guide compares the best options for web applications in 2026.
We evaluated tools based on SDK coverage, pricing models, self-hosting availability, session replay support, and language/framework breadth12. The result is a set of picks that cover different team needs — from the safe default to open-source self-hosting to free mobile crash reporting.
Sentry is the default choice for web and backend teams, and for good reason. It offers 30+ SDK platforms covering virtually every language and framework you'd use in a modern web app2. The free tier includes 5,000 errors per month, with the Team plan at $26/month3. Sentry also ships session replay, AI-powered debugging, and a self-hosted community edition for teams that need data sovereignty14.
The self-hosted route is powerful but resource-heavy — expect to provision 16GB RAM and 4 cores with PostgreSQL, Redis, Kafka, and ClickHouse, costing roughly $100–300/month in server costs plus ongoing maintenance4. For most teams, the cloud plan is the simpler path.
Verdict: If you're starting from scratch and want one tool that does everything, Sentry is the pick. Its SDK breadth, source-map handling, and self-hosting option make it the most versatile error tracker available3.
Highlight.io is a full-stack observability platform that's fully open-source under Apache 2.01. It bundles errors, logs, traces, and session replay into one self-hostable package — something even Sentry doesn't offer in a single open-source tool4.
For teams that want visual debugging (seeing exactly what the user did before a crash) without sending data to a third-party SaaS, Highlight.io is the strongest open-source option. It supports JavaScript, Node.js, Python, Go, and more.
Verdict: If you want open-source, self-hostable error tracking with session replay and full-stack observability, Highlight.io is the clear choice24.
Bugsink is a minimal, self-hosted error tracker that's compatible with Sentry SDKs4. That means you can point your existing Sentry instrumentation at a Bugsink instance and it just works — no code changes needed.
Where self-hosted Sentry demands significant infrastructure (16GB RAM, Kafka, ClickHouse), Bugsink is designed for a minimal resource footprint4. It's ideal for teams that need data sovereignty and self-hosting but don't want to operate a distributed system to get there.
Verdict: If you want self-hosting without the operational overhead of Sentry's stack, Bugsink is the lightweight on-ramp4.
Firebase Crashlytics provides real-time crash reporting, velocity alerts, and deep integration with the Firebase ecosystem at no cost2. It's the go-to for mobile teams (iOS, Android, Unity) that need crash reporting without a budget.
The trade-off is that Crashlytics is mobile-only — it won't cover your web backend or frontend JavaScript. For mobile-first apps, though, the price is hard to beat.
Verdict: If you're building a mobile app and want crash reporting for free, Crashlytics is the standard2.
| Dimension | Sentry | Highlight.io | Bugsink | Firebase Crashlytics |
|---|---|---|---|---|
| SDKs | 30+ platforms | Full-stack (JS, Node, Python, Go) | Sentry SDK-compatible | iOS, Android, Unity |
| Self-hosting | Yes (heavy) | Yes (Apache 2.0) | Yes (lightweight) | No |
| Free tier | 5K errors/mo | Open-source | Open-source | Free (all tiers) |
| Session replay | Yes | Yes | No | No |
Sentry wins on SDK breadth and self-hosting maturity. Highlight.io wins on open-source full-stack observability. Bugsink wins on lightweight self-hosting. Crashlytics wins on free mobile coverage1234.
Bugsnag is a strong contender — particularly for mobile-first teams — with stability scores per release, class-leading crash symbolication, and ML-based severity prioritization23. Its free tier offers 7,500 events/month with the Team plan at $59/month3. We weren't able to include it as a full pick in this guide, but it's worth evaluating if mobile crash reporting is your primary need.
AskBuy may earn a commission when you click through to some of the tools listed above. That doesn't change our recommendations — we pick based on what fits each use case.
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