Total certainty
in the age of AI
Where humans, systems and agents work together on rules.
What is Lemma?
Ground operations in leadership intent
Lemma (opens in new tab) is an open-source language for business rules, in an open that format anyone can read and write. This enables policy owners to write the rules themselves instead of handing them to engineers to code. Those rules become the source of truth that people, systems, and AI agents can trust.
- Systems and AI agents never guess, and every answer can be explained.
- Reproduce any decision with the rules that applied at the given time.
- Teams can share rules and extend them.
Platform
Foundation of governance
LemmaBase is where teams write the rules, review changes, control versions, and run them in production. Work together, deploy policy with confidence, and trace every decision.
Collaborate
Work together on rule specifications. Review, comment, and approve before anything goes live.
Version
Track every change to your rules. Know exactly what was live when any decision was made.
Publish
Propagate policy changes instantly. New rules, everywhere they need to be.
Govern
Audit every evaluation with full explainability. Prove your systems are compliant any time.
Solutions
Where LemmaBase thrives
Lemma makes complex business logic look easy. Insurance terms, tax rules, logistics constraints and health clinic regulations are some of the hardest logic to get right in software, and the riskiest to change. Lemma turns them into clear specifications your whole team can verify, test and update, so the rules stop hiding in spreadsheets and code.
Why LemmaBase
Why teams choose LemmaBase
IT Service Agencies
- New service offering for clients modernizing policy and rules
- Lemma expertise as a differentiator in bids and delivery
- Training and workshops to upskill your practice
- Partner with us on implementations and migrations
Enterprise & Government
- Compliance and audit trails built into every publication
- No vendor lock-in, because Lemma is open source
- Self-hosted deployment options for sovereignty requirements
- Enterprise support, SLAs, and expert implementation help
Resources
Learn more
Get started with Lemma today.
Create your free account and publish your first spec in minutes.
Open standards
Own the logic that runs your business
LemmaBase is built on open standards. Our founders created Lemma, an open-source business rule language, and placed it in the public domain, licensed as Apache 2.0 software. It is free for anyone to use, read, and build on.
Your specifications live in an open format that no single vendor owns, so the logic that runs your business always stays yours.