Comparador

Comparador is a tool for on-demand visual regression testing — compare web pages across environments, track changes over time, debug deployment issues.

Easy: Install → Capture → Compare.

No pipelines. No accounts. No external servers.

Key features:
📸 Visual Diff: Full-page screenshots with pixel-level comparison, mismatch %, multiple view modes
📄 HTML Diff: Side-by-side source comparison with syntax highlighting
📋 Headers Diff: Compare response headers (cache, CDN, security)
🪵 Logs Diff: Compare console logs — spot new errors, warnings, count changes
📊 Metrics Diff: Track 20 performance indicators (TTFB, DOM load, JS heap) with threshold-based verdicts
✅ Baselines: Accept/reject workflow with automatic + manual baseline control
🔄 Auto Compare: Automatic comparison against baselines after capture with auto-accept
🚀 Batch Capture: Capture projects or groups of URLs, compare across environments
⚡ Popup: Quick environment switching + fast access to frequently tested pages

Changelog:

1.3.5

· Context-gated review — accept/reject buttons only appear when the current entity is newer than the baseline, preventing accidental review of historical data
· State reason tracking — auto-accepted items now show why they were accepted (first capture, identical content, or promoted), visible in badge tooltips
· Smarter capture thumbnails — preview attempts follow URL display order with baseline-aware fallback
· WCAG AA themed colors — light and dark themes use separate color palettes, each verified for ≥4.5:1 contrast ratio
· Faster state-based filtering in review queries
· Bug fixes, performance improvements, and UI polish

1.3.4

· Faster diff view — new fast engine is now the default for HTML and headers diffs, dramatically improving rendering speed; rich engine available as an experimental alternative for character-level highlighting
· Syntax highlighting for headers diff — HTTP response headers now have color-coded header names and values in the diff view
· Searchable compare selectors — capture and attempt dropdowns now include a search input with contextual hints for quick filtering
· Upgraded core UI framework and dependencies
· Bug fixes, performance improvements, and UI polish

1.3.1

· Compare baseline with previous — when the latest capture is already the baseline, compare automatically diffs it against the prior version
· Eager loading — page script strips loading="lazy" before scrolling to prevent cancelled fetches in background tabs (prepare.eager, on by default)
· Unified comparison logic across all compare buttons
· Bug fixes and stability improvements

1.3.0

· Logs diff — five diff tabs now: screenshots, HTML, headers, console logs, and performance metrics. Logs are grouped by message and severity — see new errors appear, old ones vanish, or counts shift
· Metrics diff — track 20 performance indicators (TTFB, DOM load, JS heap, resources, layout) with threshold-based verdicts, worsened-only mode, smart defaults for volatile metrics, and configurable per-metric thresholds
· Per-type verdict control — include or exclude any diff tab from the overall verdict independently — disable noisy channels without losing visibility
· Diff tab severity indicators — tab icons are color-coded by diff severity so you instantly see which data types have changes
· Smarter compare filters — improved identical/differences/all filter logic with automatic filter and tab switching based on resolved verdicts
· Compare script for all types — the compare script now normalizes all four text-based data types: HTML, headers, logs, and metrics — with consistent ignore patterns supporting exact strings and regex objects
· Restructured compare variables — compare section uses clean subkeys (html, headers, logs, metrics) for all diff types
· JSON5 validation — variables editor validates syntax in real time with inline error markers
· Comparison data stored separately from metadata for faster list views

1.2.1

・Automatic comparison — every capture is instantly diffed against its baseline across screenshots, HTML, and headers with configurable thresholds
・Auto-accept — identical captures are auto-accepted and cascade up, so you only review what actually changed
・Screenshot masks — mask dynamic page regions (ads, carousels, timestamps) by CSS selector —masked areas get a checkerboard overlay in screenshots and their markup is stripped from diffs
・Compare script — normalize away noise before diffing: strip analytics, CDN tokens, dynamic selectors, headers — with regex patterns and script filters
・Compare script tester — test normalization scripts inline from project settings with live diff preview
・Comparison badges — see diff status at a glance on every capture and attempt
・Compare filters — filter URL pairs by differences or identical in capture comparison view, with auto-switch to differences when verdicts resolve
・Review page — filter by status, bulk accept/reject across captures
・Post-capture actions — View, Compare (pre-filtered to differences), and Review buttons after capture completes
・Smart script context — page and compare scripts receive auto-upgrading defaults and per-project variables
・Configurable page readiness — choose when to capture: on load, network almost idle, or full network idle
・Per-project parallel capture — configurable parallel capture concurrency per project
・Capture hardening — tab-based capture eliminates the window flash on Windows
・Auto-switch to first diff tab with changes when navigating between URL pairs
・Clear with baseline preservation, database wipe & storage stats
・Switched from Monaco Editor to CodeMirror for a lighter bundle and snappier diffs
・Updated help with a new Automation chapter covering all five scripts and variables
・Compressed backups — smaller export files, faster backup & restore
・Hardened backup & restore — large file support, interactive modals with progress tracking, tab-close prevention
・Faster navigation in comparison views due to optimized data loading and rendering
・Bug fixes and stability improvements

1.1.0

• Baseline & review workflow — accept/reject captures and individual URLs, automatic + manual baseline pinning
• Review page — dedicated view for reviewing pending captures with progress tracking
• Built-in help — documentation with diagrams, covering all features
• Dashboard with pending review shortcuts
• Deletion protection for capture-bound attempts
• Dependency updates and bug fixes

1.0.2

• Database backup & restore
• Quick capture buttons on project/group lists
• Compare buttons to diff last 2 attempts/captures
• Enhanced attempt view with dropdown actions
• Improved stability when switching/deleting projects
• UI polish and bug fixes

1.0.1

• Initial release