Sentry is the dominant tool for error tracking, and for good reason. It has SDKs for almost every language, mature issue grouping, session replay, tracing, and a polished developer workflow. But its pricing model is event-based and multi-dimensional: errors, spans, replays, logs, and profiling hours are each billed separately, with reserved volume and pay-as-you-go budgets that can produce unexpected bills when a noisy deployment floods the error queue.
Teams looking for free or significantly cheaper alternatives usually fall into one of three categories: they want a free self-hosted option with no per-event cost, they need a more predictable pricing model as they scale, or they want error tracking bundled inside a broader observability platform that does not charge separately for every data type.
This guide covers the best free Sentry alternatives for error monitoring in 2026, with pricing and feature details taken only from each tool’s own website and documentation.
Key Takeaways
- CubeAPM unifies JavaScript, API, and backend error tracking with full stack traces, log correlation, and trace-level context in a single self-hosted dashboard at ingestion-based pricing of $0.15/GB with no per-error or per-event fees.
- GlitchTip is the most direct free Sentry alternative: fully open source, Sentry SDK-compatible with no re-instrumentation needed, free to self-host with no event limits, and free on its hosted cloud plan up to 1,000 events per month.
- PostHog has the most generous free cloud tier for error tracking: 100,000 exceptions per month at no cost, no credit card required, with error tracking integrated natively alongside session replay and product analytics.
- Bugsink is a lightweight self-hosted error tracker using the Sentry SDK format. It is free to self-host under the Polyform Shield license. Its hosted plan includes a free tier of 15,000 events per month, with paid volume-based plans starting at $16/month.
- SigNoz is an open-source, OpenTelemetry-native observability platform with exception tracking included. The self-hosted Community Edition is free. SigNoz Cloud starts at $49/month and includes usage up to that amount.
Why teams look for Sentry alternatives
Sentry’s pricing, as documented on Sentry’s pricing docs, is per event and per data category. Each paid plan includes a set monthly base volume across categories. Additional volume is covered by reserved (prepaid) volume or a pay-as-you-go budget shared across categories. Once both are exhausted, data is dropped for the remainder of the billing cycle.
Confirmed plan details from Sentry’s pricing docs and Sentry’s pricing page:
- Free Developer plan: For individual developers; supports 1 member and 1 project; limited monthly event volume. All Sentry plans include 5GB of logs per month.
- Team plan: $29/month. Includes 50,000 errors, 5GB logs, 5GB application metrics, 5M spans, 50 replays, 1 cron monitor, 1 uptime monitor, and 1GB attachments per month as base volume.
- Business plan: $89/month. Same base volumes as Team; higher per-event overage rates and additional enterprise features.
The most common reasons teams look for alternatives are: event-based pricing becomes unpredictable at scale when spikes hit multiple billing categories simultaneously; the free Developer plan is limited to a single developer and single project; Sentry’s self-hosted option requires significant infrastructure, including Kafka, Redis, and ClickHouse; and teams that only need error tracking find themselves paying for a broader platform they do not fully use.
1. CubeAPM
CubeAPM is a self-hosted, OpenTelemetry-native observability platform with a dedicated error tracking product that unifies JavaScript, API, and backend errors in a single dashboard, correlated with the full trace and log context around each failure.
Features
- Captures JavaScript errors, API endpoint failures (including non-2xx status codes), and backend/server errors, all visible in one consolidated dashboard
- Errors are surfaced directly inside the trace graph view: when a request fails, the affected span is highlighted, showing exactly where in the service flow the error occurred
- Trace-level context: see the exact span that threw the error, its latency, and related dependencies
- Log correlation: one click from an error span opens the relevant logs for full stack trace details
- Error grouping: recurring exceptions are grouped together so engineers see patterns instead of duplicate noise
- Impact analysis: errors are tied to user sessions and upstream latency, showing how failures affect the end-user experience
- Integrates with existing stacks: OpenTelemetry, CI/CD pipelines, Slack, and PagerDuty for alerting and workflow continuity
- Built to handle enterprise-grade scale: customers use CubeAPM to monitor hundreds of microservices, thousands of hosts, and process millions of traces per minute
- Self-hosted on-prem; no error or trace data leaves your cloud
Pricing: $0.15/GB of data ingested. No per-error, per-event, per-host, or per-user fees.
Limitations: Requires self-hosting and infrastructure management. Not open-source. Error tracking is part of a broader APM platform rather than a narrowly scoped, dedicated error tracker, so teams that want only error tracking with nothing else are taking on a fuller observability stack.
Best for: Teams that want error tracking correlated with full-stack traces, logs, and infrastructure metrics in a single self-hosted platform, with predictable ingestion-based pricing that does not scale with error or event volume.
2. GlitchTip
GlitchTip is a fully open-source error tracking platform built to be compatible with Sentry’s SDK and DSN format. If your application already sends errors to Sentry using a Sentry SDK, switching to GlitchTip requires only changing the DSN endpoint in your SDK configuration. No re-instrumentation is needed.
Features
- Error tracking with stack traces and issue grouping
- Sentry SDK compatibility across all supported languages
- Performance monitoring (slowest web requests, database calls, transactions)
- Uptime monitoring
- Log message and Content Security Policy violation capture
- Version 6.1 (March 2026) added logging support via the OTel logging SDK, DuckDB-backed cold storage for event archiving at significantly lower resource cost, an optional MCP server for AI-assisted debugging, and performance monitoring via spans alongside transactions
Pricing:
| Plan | Events/month | Price |
| Free (hosted) | 1,000 | $0 |
| Small (hosted) | 100,000 | $15/month |
| Medium (hosted) | 500,000 | $50/month |
| Large (hosted) | 3,000,000 | $250/month |
| Self-hosted | Unlimited | Free (suggested donation: $5/user/month) |
GlitchTip runs on 4 containers self-hosted compared to Sentry’s 40+, making it significantly more practical to operate on modest infrastructure. The free hosted plan includes unlimited projects and unlimited team members. EU hosting in Germany is available on all plans. HIPAA-compliant hosting is available as an add-on to Large plans. Non-profits and open-source projects receive discounted plans starting at $5/month.
Limitations: No native session replay. No full distributed tracing equivalent to Sentry’s trace waterfall. Fewer integrations than Sentry. UI is functional but less polished than Sentry’s.
Best for: Teams that want to escape Sentry’s pricing without rewriting their instrumentation, or need to self-host error tracking without taking on Sentry’s infrastructure requirements.
2. PostHog
PostHog is a product analytics platform that has expanded to include error tracking, session replay, feature flags, experiments, and a data warehouse. Its error tracking free tier is the most generous of any tool in this comparison.
Features
- Exception autocapture for unhandled errors and rejections
- Stack trace demangling and source map support
- Issue grouping, merging, and assignment
- Alert routing via Slack, email, and webhook
- Native integration with PostHog session replay: click from an error directly to the user’s session recording
- Native integration with PostHog product analytics: use exceptions as events in trends, funnels, and retention charts
- Feature flag integration: roll back features that caused specific exceptions
- Suppression rules: future matching exceptions are dropped before ingestion and not billed
Pricing:
- First 100,000 exceptions per month: free, no credit card required
- 100,000 to 325,000: $0.000370 per exception
- 325,000 to 10,000,000: $0.000140 per exception
- 10,000,000+: $0.000115 per exception
Billing is per $exception event ingested. The number of issues, merged issues, or resolved issues does not affect the bill. Billing limits can be set per product to avoid unexpected charges.
Limitations: PostHog’s error tracking page openly lists current gaps versus Sentry: no uptime monitoring, currently limited to Slack and email alerts on custom criteria, less advanced error grouping, and weaker mobile SDK support. PostHog states directly: “Even our team thinks Sentry is better if you need mobile support. For now.”
Best for: Teams already using PostHog for analytics or session replay who want error tracking without adding a separate vendor, and early-stage teams that need a generous free tier with no credit card required.
3. Bugsink
Bugsink is a self-hosted error tracker built specifically to be simple, lightweight, and Sentry SDK-compatible. It is maintained by a single developer and designed for teams that want data sovereignty and predictable costs without the operational overhead of self-hosted Sentry.
Features
- Full stack traces with local variable capture
- Issue grouping and alert routing via Slack, email, and webhooks
- Sentry SDK compatibility: same DSN format, migration requires only a DSN change
- Bugsink 2.0 (February 2026) added a public API, tighter security defaults, and updated platform support
- Available as a hosted service operated from the EU, for teams with data sovereignty requirements
Pricing:
- Self-hosted: Free for non-competing uses under the Polyform Shield license; no per-event or per-user charges
- Hosted free tier: 15,000 events/month (5,000 retained for 30 days), 1 user
- Hosted paid plans (volume-based, updated March 2026):
| Events/month | Price |
| 75,000 | $16/month |
| 600,000 | $50/month |
| 3,000,000 | $158/month |
| 15,000,000 | $568/month |
| 50,000,000 | $1,288/month |
- Enterprise hosted: Starts at €500/month for fully managed hosting with dedicated support
Limitations: Bugsink is intentionally focused on error tracking only. There is no performance monitoring, no session replay, no distributed tracing, and no metrics. The feature set is significantly narrower than Sentry. The Polyform Shield license is not an OSI-approved open-source license; it prohibits competitors from building competing products on top of Bugsink.
Best for: Developers and small teams that need lightweight, self-hosted error tracking with Sentry SDK compatibility and zero per-event cost, particularly where data sovereignty or EU hosting matters.
4. SigNoz
SigNoz is an open-source, OpenTelemetry-native observability platform covering traces, metrics, logs, and exceptions in a single platform built on ClickHouse. Exception tracking is a feature within SigNoz rather than its primary focus, but each exception correlates directly with the trace in which it occurred.
Features
- Exception tracking with correlated trace context: each exception links to the span and trace where it was captured
- Distributed tracing with flamegraphs and service maps
- Log management with a query builder
- Application metrics and alerting
- OpenTelemetry-native: instrument once with standard OTel SDKs; no proprietary agent required
- Exception monitoring available natively for Python, Java, Ruby, and JavaScript; other languages supported with a few lines of additional code
- Available as self-hosted Community Edition and managed SigNoz Cloud with a 30-day free trial
Pricing:
- Community Edition: Free; self-hosted; MIT Expat license
- SigNoz Cloud: $49/month base, which includes usage up to $49 in value; additional usage billed at $0.30/GB for logs and traces, $0.10 per million metric samples; no per-seat fees
Limitations: Exception tracking in SigNoz is less mature as a standalone workflow than Sentry’s dedicated error tracking. Advanced issue grouping, assignment workflows, and error-specific triage features are less developed. SigNoz is better described as a full observability platform where error tracking is one feature, rather than a dedicated Sentry replacement.
Best for: OpenTelemetry-first teams that want traces, logs, metrics, and exceptions in a single self-hosted platform, and are willing to accept a less polished error triage workflow in exchange for broader observability coverage.
What about Sentry self-hosted?
Sentry itself is source-available on GitHub under the Functional Source License (FSL), as documented on Sentry’s FSL announcement. The self-hosted version gives you unlimited event volume but requires Kafka, Redis, ClickHouse, Snuba, and more, plus at least 16GB RAM in a multi-container setup. Sentry’s self-hosted GitHub repository describes it as packaged for “low-volume deployments and proofs-of-concept” and the operational burden is substantially higher than any of the alternatives above.
Comparing the free options
| Tool | Free tier | Self-hosted | Sentry SDK compatible | Session replay | OTel native | License |
| CubeAPM | N/A (ingestion-based at $0.15/GB) | Yes | Via OTel | Yes | Yes | Proprietary |
| GlitchTip | 1,000 events/month hosted; unlimited self-hosted | Yes | Yes | No | No | MIT (OSI-approved) |
| PostHog | 100,000 exceptions/month | No (cloud only for free tier) | No (PostHog SDK) | Yes | No | MIT |
| Bugsink | 15,000 events/month hosted; unlimited self-hosted | Yes | Yes | No | No | Polyform Shield (not OSI) |
| SigNoz | Unlimited (Community Edition, self-hosted) | Yes | No (OTel SDK) | No | Yes | MIT Expat |
Where CubeAPM fits for teams that need more than error tracking
Error monitoring is most useful when it connects to the full picture of application health: which service is throwing the errors, what the latency looked like at the time, and which deployment introduced the regression.
CubeAPM is a self-hosted, OpenTelemetry-native APM platform that provides this broader context. It accepts OTLP telemetry from the same instrumentation your applications already use and surfaces service maps, error rates, latency distributions, and deployment-correlated performance views alongside exception data. Pricing is ingestion-based at $0.15/GB with no per-error, per-event, per-host, or per-user fees.
For teams that find dedicated error trackers like GlitchTip or Bugsink too narrow, CubeAPM provides the APM layer that connects errors to traces, metrics, and service health in a single self-hosted platform.
Summary
If you need a free Sentry alternative specifically for error monitoring, the right choice depends on three factors: whether you want self-hosted or cloud, whether you need Sentry SDK compatibility for zero re-instrumentation, and how much you need beyond pure error tracking.
GlitchTip is the closest free drop-in replacement: open source, Sentry SDK-compatible, self-hostable on modest infrastructure, and actively maintained with a March 2026 release adding logging and DuckDB cold storage. PostHog offers the most generous free cloud tier at 100,000 exceptions per month with no credit card required, and adds session replay and product analytics in the same platform. Bugsink is the most minimal option for teams that want simplicity and data sovereignty, free to self-host with no per-event cost, and offering a free cloud tier of 15,000 events per month with volume-based paid plans starting at $16/month. SigNoz gives you free self-hosted exception tracking inside a broader OpenTelemetry-native observability platform, at the cost of a less mature error triage workflow.
| Tool | Best for | Free tier | Sentry SDK compatible |
| CubeAPM | APM + error context, self-hosted | N/A (ingestion-based at $0.15/GB) | Via OTel |
| GlitchTip | Drop-in Sentry replacement, self-hosted | 1,000/mo hosted; unlimited self-hosted | Yes |
| PostHog | Cloud free tier, session replay integration | 100,000 exceptions/month | No (PostHog SDK) |
| Bugsink | Self-hosted or EU-hosted, data sovereignty | 15,000 events/month hosted; unlimited self-hosted | Yes |
| SigNoz | OTel-native full observability, self-hosted | Unlimited (Community Edition) | No (OTel SDK) |
Disclaimer: Pricing and feature details are sourced from official vendor websites and documentation as of June 2026, including Sentry’s pricing page, Sentry’s pricing docs, GlitchTip’s pricing page, PostHog’s pricing page and PostHog’s error tracking pricing docs, Bugsink’s website, and SigNoz’s pricing page. Sentry’s Team and Business plan prices are confirmed from Sentry’s Stripe Projects blog post. The Developer plan free tier event volume is shown on Sentry’s pricing page; verify the current specific per-category limits directly there as they are subject to change. Always verify pricing and features with each vendor before making decisions. CubeAPM is referenced as a complementary tool; evaluate all platforms against your own requirements.
Also read:
Best Sentry Alternatives for Python Apps in 2026