Free tools for error tracking

Stack-trace utilities, source-map validators, DSN parsers, and pricing calculators. Free, no signup, no rate limits worth mentioning. Built by the team behind GlitchReplay.

Source maps

Stack-trace and source-map utilities. The same things GlitchReplay runs automatically on every event.

Stack trace deminifier

Paste a minified stack trace and a source map. Get a readable stack with original file paths, line numbers, and source context.

Source map validator

Upload a .map file. See coverage stats, missing fields, and the common mistakes that break deminification before you ship.

Sentry compatibility

Tools for the Sentry ecosystem. GlitchReplay is Sentry-SDK compatible — these work with both.

Sentry DSN parser

Paste any Sentry-format DSN. See the parsed fields, validation warnings, and a working curl command against the ingest endpoint.

Pricing

Math tools to compare per-event vs flat-rate pricing for error tracking and session replay.

SDK sample rate calculator

Given event volume and a monthly budget, the SDK sample rate that fits — and the unique bugs you would silently lose.

Session replay storage estimator

Estimate monthly storage and bandwidth for session replay across your real traffic, retention, and sample rate.

Performance

Real-user performance lookups. The same Web Vitals data we surface on every project.

Web Vitals lookup

Paste a URL. Get current p75 INP, LCP, CLS, FCP, and TTFB from Google's CrUX dataset, mobile and desktop.

Privacy

PII detection and redaction utilities. Run them against your real payloads — nothing leaves the browser.

PII detector

Paste a JSON event. See exactly which fields would be flagged as PII and how they would be redacted before storage.

Security

CSP, security headers, and the report endpoints that feed your error stream.

Security headers scorecard

Enter a URL. Get an OWASP-aligned scorecard for HTTP security headers, with per-header recommendations.

CSP report endpoint generator

Generate a working report-to / Reporting-Endpoints header plus sample wiring for Next.js, Express, and Cloudflare Workers.

CSP violation decoder

Paste a CSP violation report. Get a plain-English explanation, an attack-vs-misconfiguration verdict, and a fix recommendation.

CSP rollout simulator

Paste your existing violation reports. See exactly what would still break if you tightened your CSP to a stricter policy.

Reliability

SLO and error-budget math for engineering managers without a dedicated SRE team.

Error budget calculator

Convert raw error rate plus traffic into 9s, monthly budget, and projected burn — the number you can take to leadership.

Debugging

Decoders for the gnarliest production error messages.

React hydration error decoder

Paste a React hydration error message or minified error code. Get a plain-English explanation, the top three likely causes, and fix snippets.

Stop debugging from the bill.

GlitchReplay is Sentry-SDK compatible, includes session replay and security signals, and never charges per event. Free to start, five minutes to first event.

Get started — free Read the docs