Percy vs BackstopJS

From $599 per month (indicative, paid tier)

Free and open source

Billed per screenshot. Multiply pages x widths x browsers x commits before committing — this is where budgets are misjudged.

Free and open source. You pay in engineering time and CI minutes.

Free tier with a monthly screenshot allowance suitable for a small project.

Everything, self-hosted

Widely used

BrowserStack · since 2015

Established

OSS community · since 2015

• Plugs into an existing suite with a few lines rather than requiring new tests.
• Server-side rendering removes machine-to-machine screenshot inconsistency.
• Good PR-based approval workflow that developers actually use.

• Free with no snapshot quota — run it as often as you like.
• Baselines stay in your repository, which suits regulated or air-gapped environments.
• Simple JSON configuration that a junior engineer can extend.

• Screenshot-based billing escalates faster than teams expect.
• Dynamic content requires careful masking or you drown in false diffs.
• Responsive widths are rendered, not truly executed in each browser, which occasionally hides real issues.

• Pixel-diff comparison means font rendering differences between machines cause false failures; Docker is effectively mandatory.
• No hosted review or approval workflow — approving means committing new images.
• Reference images bloat the Git repository over time.

Teams with an existing E2E or Storybook suite who want visual coverage without new tests.

Teams that need visual testing without a SaaS vendor or a per-snapshot bill.