Side by side
SnapDiff vs Watchlight
Both stand on visual regression testing software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan APIWeb
Choose SnapDiff if you need pixel-based page comparisons, pull request checks, or scheduled URL monitoring. The Free plan has no watchers, and teams needing higher allowances or MCP server access must choose a paid plan starting at $19 a month.
Visit SnapDiff Free plan Windows
Choose Watchlight for local screenshot comparisons across desktop apps and games, with a free GUI tier and automation options. Teams that need CLI or MCP after beta should plan for Pro at $9 a month.
Visit WatchlightThe facts
| SnapDiff | Watchlight | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | API, Web | Windows |
| Lowest paid plan | Dev: $19 a month | Pro: $9 a month |
| Plans published | 5 | 2 |
| Maker | Not published | Not published |
| Website | snapdiff.ai | getwatchlight.com |
| On visual regression testing software | #18 of 26 | #22 of 26 |
SnapDiff: what it does well
- Compare two URLs through an HTTP API without a test suite or CI/CD pipeline.
- Diffs include a percentage, highlighted image, and bounding boxes.
- GitHub Action checks pull requests and can find Vercel preview URLs.
- Scheduled URL monitoring can send threshold-based webhooks.
- Comparison controls include ignore regions and CSS selector masking.
What to know first
- The Free plan allows 200 diffs and 2,000 screenshots per month.
- The Free plan has zero watchers and a 10 requests-per-minute limit.
- Paid plans start at $19 a month.
Watchlight: what it does well
- Runs locally without a cloud dependency.
- Free GUI tier has unlimited projects, scenes, and snapshots.
- Captures can start after a delay or stdout pattern.
- Diff results include thresholds, percentages, and pass/fail status.
- CLI supports structured JSON and strict mode.
What to know first
- Windows is the only listed platform.
- CLI and MCP require Pro after beta.
- Pro is $9 a month.
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