Pricing
Open source is free forever.
Paid tiers buy room for private projects, and nothing else. A card looks the same on every tier.
Everything is free during the preview. Billing starts with 30 days' notice here. Workspaces created before 23 October 2026 keep the 60 days' notice they signed up with, and Team free for 6 months after billing starts.
Free
Free, forever
- Unlimited public projects
- 3 private projects in the workspace
- Cards, IZ4 badges, reports and history
- Dependency coverage
most teams
Team
£29 / workspace / month
or £290 a year
- 25 private projects in the workspace
- Publish chosen invariants on a private card
- IZ4 badges for private projects
- Unlimited members
- Private history and change indicators
Estate
£249 / workspace / month
or £2,490 a year
- Unlimited private projects in the workspace
- Publish chosen invariants on a private card
- Priority support
How it works
- You pay per workspace. One price covers everyone in it and every public project it holds.
- The tiers differ in two things: how many private projects in the workspace, and whether a private card can show invariants you choose to publish. Nothing else changes between tiers.
- Anyone may read a card, on any tier, without paying.
- Prices are in GBP plus VAT and are billed monthly. You can cancel at any time.
- Future: estate-level reporting. It is not part of any tier yet and carries no price.
Our promises
- Money never buys a better card. A failed check looks the same on every tier.
- Miss a payment and nothing disappears. The workspace becomes read-only above the free allowance, and every card stays up.
- The IZ4 badge says one thing: the current revision has a valid IZ4. It does not say the software is good.
- Your private IZ4 is yours. We never open a private repository. A card carries counts and digests, and only the invariants you choose to publish, in your own words. Nothing you send us goes to an AI model.