Free Web Analytics & Observability Tools
Stand-alone browser utilities for developers, marketers, and webmasters. 100% free, execute locally in your browser, and require no account creation.
Campaign URL & UTM Builder
Build standardized, clean marketing links with custom utm_source, utm_medium, and utm_campaign tags. Features 1-click clipboard copy and preset platform tags.
- Quick source/medium presets
- Instant URL validation
- 1-click clipboard copy
Analytics Cost Comparison Calculator
Benchmark monthly subscription costs, tracker script weights, and feature limits between Open Analytics, Google Analytics 4, Plausible, PostHog, and Matomo.
- Interactive volume slider
- 6 platform cost matrices
- Annual savings estimate
AI Crawler & Robots.txt Tester
Audit and configure access rules for SearchGPT, ClaudeBot, and PerplexityBot. Generates production-ready robots.txt rules and /llms.txt AI discovery manifests.
- Toggle 8 top AI crawlers
- Generates /llms.txt manifest
- Production robots.txt output
Analytics Event Debugger & Schema
Interactive telemetry event sandbox. Test property typing, inspect payload byte size against 16KB limits, verify PII redaction rules, and generate code snippets.
- Interactive property builder
- 16KB byte limit meter
- Vanilla JS, React, cURL
Core Web Vitals Budget Calculator
Interactive Google Page Experience simulator. Benchmark LCP, INP, and CLS thresholds against Google p75 field targets with actionable engineering advice.
- Interactive p75 threshold sliders
- Overall pass/fail audit
- Google ranking impact
Cookie & Privacy Consent Audit
Audit third-party script cookies, calculate GDPR consent banner requirements, and calculate conversion rate improvements from switching to cookieless telemetry.
- Third-party cookie auditor
- GDPR banner requirement check
- Projected conversion gain