Comparador

Instant visual regression testing without the infrastructure

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 🤝 Team Sync — share project setup with your team via export/import files, or auto-sync via Git/GitHub — no cloud account needed ⚡ Popup: Quick environment switching + fast access to frequently tested pages Changelog: 1.4.4 General changes: · Group compare button — Manage view for a group now has a Compare button (previously only available on captures/attempts), comparing the group's baseline capture against its latest · Popup action menu — replaced the right-click trigger (which could close the popup before the menu opened) with a compact left-click button next to each navigation link · Added a Known Issues section to the documentation, covering a macOS Chrome popup-latency bug and expectations around cross-machine screenshot differences · Bug fixes and stability improvements AEM-related (Adobe Experience Manager): · Comparison defaults — HTML diff normalization now ships with working AEMaaCS clientlib cache-bust hash handling, Core Components data layer noise removal (repo:id, repo:modifyDate), and adaptive image (coreimg) rendition timestamp normalization, so cross-environment AEM diffs no longer flag pure infrastructure noise as changes · Opt-in environment host normalization — documented replacePatterns examples for normalizing direct AEMaaCS Author/Publish hosts or public dispatcher/CDN domains that differ per environment, for projects without a shared public domain in front · Navigation script fixes — corrected jump links for AEMaaCS's unified shell editor URLs (/ui#/aem/editor.html/...), CRX/DE links with query suffixes, and pages with no resolvable content path — cross-environment and Author/Publish jumps now resolve correctly in every case · Improved consistency between generic and AEM project variable presets — capture and comparison override examples now documented in both 1.4.2 · Project sync — safer handling of changes when synchronizing projects · Removal policies — choose how removed project data is handled during sync · Documented capture and automation timeouts · Updated footer branding and links 1.4.1 · Project sync — share project configuration (URLs, settings, scripts, variables) with your team via GitHub, any Git remote (Bitbucket, GitLab, Gitea, self-hosted), or a local/shared folder. Push and pull explicitly, or set a Pull mode to check and pull automatically · Pull mode — choose how eagerly Comparador checks for remote changes: manual only, always, or every 5/15/60 minutes · Sync status is based on comparing actual content, not timestamps, so it stays accurate across providers and reconnects · Comments in your project variables survive sync round-trips · Clear with baselines — optionally clear baseline data when clearing a project, group, or URL · Refined screenshot sensitivity validation and descriptions · Consistent settings resolution when comparing attempts, including comparisons across projects · More information visible in searchable selectors, with full values available in tooltips · Bug fixes, performance improvements, and UI polish 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