Kaloko vs Percy and Chromatic
Percy and Chromatic tell you what changed since the last approved baseline. Kaloko tells you whether the new work does what the task asked, in every language and screen size, and who signed it off.
Side by side
| Kaloko | Percy / Chromatic | |
|---|---|---|
| Compares against | The task’s acceptance criteria, plus a pixel diff against the accepted baseline run | The last approved snapshot (pixel diff); Percy adds an AI review agent that filters diff noise |
| Unit of review | Whole flows: steps, branches, e-mails, third-party screens, mobile and desktop apps | Snapshots: Storybook components (Chromatic) or pages (Percy) |
| Languages and screen sizes | Every step in every locale and viewport side by side on one canvas | Widths and browsers per snapshot |
| Who reviews | Developers, QA, product owners and clients; viewers are free in every plan | The team approving visual changes in the CI and pull-request workflow |
| Sign-off | Stamps per step, a run verdict, required approvers, history | Accept or deny each visual change |
| Cross-browser and real devices | No: Chrome through Playwright, the Android emulator and the iOS Simulator | Yes: browser grids, and BrowserStack’s device cloud behind Percy |
| Compliance | No SOC 2 attestation yet | Chromatic has SOC 2 |
| Agents | A skill for Claude Code, Codex and Cursor, an MCP server, any other agent through the CLI | Chromatic offers a Storybook MCP server |
| Where it runs | Any address: local, staging, production read-only, apps, e-mail | Your CI against Storybook or pages |
- You need cross-browser or real-device coverage today.
- Your design system lives in Storybook and you want component-level regression.
- You need a SOC 2 attestation from the vendor now.
- Agents ship whole features and someone has to accept each one against the task.
- Your site or app runs in several languages and screen sizes and non-engineers review it.
- You want one record of who approved what, independent of the host and the agent.
When to use both
Use both: Chromatic keeps checking the components in Storybook, and Kaloko accepts the flows built from them.
Independent of host, agent and AI vendor
Kaloko walks any address, works with any coding agent through the same skill, MCP server and CLI, and its semantic evaluator is replaceable: hosted by us or with your own key. The record of who approved what stays in one place, exportable, whichever tools you change.
Facts about other products as of 30 September 2026, from their public pages; they change often. Tell us if something is out of date: support@sinfin.cz.
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