Sentry's pricing can get painful fast. Here are four free and open-source alternatives — Highlight.io, New Relic, Bugsnag, and Apache SkyWalking — that cover error tracking, observability, and session replay without the bill shock.
Sentry is the default choice for error tracking — and for good reason. It works, it's well-known, and its SDKs are everywhere. But if you've been using it for a while, you've probably noticed the pattern: your error volume grows, your team scales up, and suddenly your monthly bill is a lot higher than you expected. That's the Sentry tax.
The good news is that the error monitoring space has matured. There are now excellent alternatives — some with genuinely generous free tiers, others fully open-source and self-hostable — that cover everything from basic crash reporting to full observability. Here are four of the best.
Highlight.io is the closest thing to a modern Sentry replacement that also feels like it was built for 2025. It offers both a free SaaS tier and a self-hosted open-source version, and its standout feature is session replay: you can watch exactly what a user did in the moments leading up to an error. That turns a cryptic stack trace into a play-by-play of the actual bug.
For teams that spend hours reproducing issues from vague bug reports, this alone is worth the switch. The free tier covers a reasonable volume for small-to-mid-size projects, and the open-source version gives you full control if you want to self-host.2
New Relic has been around forever, and it shows in the breadth of what it offers. The free tier gives you 100 GB of data ingestion per month — that's enormous for a free plan — plus full access to its APM, infrastructure monitoring, logs, and error tracking capabilities.2
The trade-off is that New Relic is a lot more than an error tracker. It's a full observability platform. If you just want simple crash reporting, it might feel like overkill. But if you're already thinking about moving toward better observability — traces, metrics, logs all in one place — the free tier is hard to beat.
Bugsnag takes a slightly different approach. Instead of flooding you with every individual error, it groups them intelligently and surfaces what matters through its stability score — a single metric that tells you how stable your latest release is.2
This makes it a strong choice for teams that deploy frequently and want to catch regressions fast. The free tier is generous enough for small teams, and the focus on stability rather than raw error volume means you spend less time triaging noise.
If you'd rather not rely on any SaaS provider at all, Apache SkyWalking is a fully open-source application performance monitor that includes error tracking, distributed tracing, and topology mapping. It's a top-level Apache project with a large community and no pricing tiers — it's just free.1
The catch is that you need to self-host and manage it yourself. SkyWalking is powerful but has a steeper learning curve than the SaaS options above. It's best suited for teams that already run their own infrastructure and want full ownership of their monitoring data.
| Feature | Highlight.io | New Relic | Bugsnag | Apache SkyWalking |
|---|---|---|---|---|
| Free Tier | Generous SaaS + open-source | 100 GB/month | Small team free tier | Fully free (self-host) |
| Self-Hosting | Yes (open-source) | No | No | Yes (open-source) |
| Key Differentiator | Session replay | Full-stack observability | Stability scoring | Distributed tracing |
All four alternatives address the core pain point that drives people away from Sentry: unpredictable pricing that scales with error volume. Each one solves it differently:
None of these are perfect for every use case. If you need Sentry's specific SDK integrations or its breadcrumb system, migrating might take some work. But if you're tired of bill shock and want error tracking that works with your budget, any of these four is worth a serious look.
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