Evaluate flags over OFREP from the OpenFeature SDK you already use. Kaiten’s CEL targeting rules read what each customer bought — their license, their recorded usage, the deployment zone they run in — so your flags know what the contract allows.
Traditional tools treat flags as isolated switches. But in B2B SaaS, a flag's value depends on who is evaluating it: Does this customer have the right license? Are they in the right deployment zone? Have they exceeded their quota?
Traditional approach:
[Flag tool] ←── custom sync ──→ [Billing] ←── custom sync ──→ [Your Code]
Kaiten approach:
[Kaiten] ← one source of truth → [Your Code]
"Is flag on AND does the contract allow it?" — answered in one call
Your call sites stay standard.
Kaiten implements the OpenFeature Remote Evaluation Protocol. Use the standard OpenFeature SDK in your language of choice, with its OFREP provider — no Kaiten package. Your code asks OpenFeature, not us.
Flags that read the business.
Targeting rules can read the evaluated customer's license, their recorded usage and the deployment zone they run in — facts Kaiten's server writes, so a caller can't forge them. Gate a feature on a plan, or on the quota left, in one rule.
Surgical targeting with real expressions.
Target feature flags using the Common Expression Language (CEL) — the same expression engine used by Google Cloud IAM and Kubernetes. Write real logic, not UI-click conditions.
Ship with confidence.
Roll out features gradually using percentage rollout, CEL targeting rules, date-based schedules, or instant kill switches. Combine multiple strategies. Support variants with typed payloads.
A trace, not a tracking plan.
Evaluations are published as events, without the targeting context, so no targeting key or user attribute is exposed: on the event stream when you self-host, as signed webhooks on Kaiten Cloud. Adoption analytics per customer are on the roadmap.
A standalone flag service answers “is it on?”. Knowing whether the customer’s contract allows it takes a sync you build and keep alive.
| Capability | Kaiten | Flag tool + your glue |
|---|---|---|
| Flag evaluation | OFREP, from any OpenFeature SDK with an OFREP provider | The vendor’s SDK or provider |
| Knowing what the customer bought | Rules read the license the server holds | A sync from billing you maintain |
| Quota-aware flags | Rules read recorded usage | Another join between two systems |
| Where the rules live | Next to the licenses and usage they read | In a tool that has never seen the contract |
| Source code | Open source, self-hostable | Depends on the vendor |