Screens
Scan history
Keep a visual record of what changed across commits, branches, and release candidates.
fossil A clearer view of your product.
fossil maps your app's screens, states, flows, and visual changes in one local interface.
Screens
Version comparison
Compare responsive layouts and scan versions side by side before you ship.
Screens
18 states · 1 flow
Flow maps
Visualize the paths users can take through your product instead of reviewing screens in isolation.
Make product decisions with fewer blind spots.
See your interface clearly before choosing what to improve next.
See the full surface
Screens, states, flows, and changes stay visible together.
Find UX weak spots
Spot stale states, awkward journeys, drift, and forgotten surfaces.
Decide with context
Return to evidence instead of memory or scattered screenshots.
Launch pricing
Local License. One-time payment.
Local License
€44.50 €89 50% launch discount
- One-time local desktop license
- No subscription and no required account
- Private target projects stay on your machine
- Local scans, history, and comparison
- Report export for product reviews
Frequently asked questions
What data leaves my machine?
Your target projects stay local by default. fossil analytics does not collect source code, project files, filesystem paths, command output, server logs, screenshots, secrets, license keys, or target-project content. If you connect an AI agent, fossil shares the bounded task context that agent needs for the workflow you started.
Will fossil work with my stack?
fossil is built for web projects you can open or run in a browser, whether it is your product, a client app, an internal tool, or another project you need to inspect. Point fossil at a project with a preview command or reachable URL, and it maps the screens and states it can access.
Can I connect fossil to any AI agent?
Yes, if the agent supports MCP. Codex has the most integrated flow in fossil, but you can also connect MCP-capable agents by adding fossil as a local stdio MCP server, then letting the agent request bounded project and exploration context.
Will fossil change files in my project?
Not silently. fossil can read your selected project, run the preview command you approve, and create or update fossil-owned metadata when you choose setup or scan workflows. Any agent-assisted writes are scoped and reviewed against fossil's write policy.
Are team features coming?
Yes. The first release focuses on the local desktop workbench, and a cloud subscription is planned for teams that need to sync fossil data across people, projects, branches, and review workflows.