Write your types once.Sync them everywhere.
Hand-written types drift the moment someone ships in a hurry. SyncLangs compiles one .syln schema into idiomatic TypeScript, Python, Go, Rust, Java, C++ and C#, so every codebase shares the exact same shapes.
1# user.syln — one source of truth2type Role = "admin" | "member" | "guest"3 4struct User {5 id: string6 email: string7 role: Role8 createdAt: datetime9 active: bool = true10}One source of truth, fanned out to seven codebases
Every target is generated from the same schema in a single pass. No adapters, no hand-written glue, no chance to drift apart.
See the same schema in every language
The schema on the left is the contract. Pick a target and watch the exact, idiomatic output SyncLangs generates for it.
# user.syln — one source of truthtype Role = "admin" | "member" | "guest" struct User { id: string email: string role: Role createdAt: datetime active: bool = true}export type Role = "admin" | "member" | "guest"; export interface User { id: string; email: string; role: Role; createdAt: Date; active: boolean;}Three steps from schema to shipped
No runtime, no service to run. SyncLangs is a build-time generator that fits the workflow you already have.
Define once
Describe your types in a single readable .syln schema. Enums, structs, defaults, nested references, optionals. No boilerplate.
Generate everywhere
Run syln generate. Idiomatic, type-safe code lands in every target language at once, formatted the way each ecosystem expects.
Stay in sync
Change the schema, regenerate, commit. Every service speaks the same shapes. Drift becomes impossible by construction.
Built to keep contracts honest
SyncLangs replaces the brittle, hand-maintained type definitions scattered across your services with one schema that compiles to all of them.
One schema, seven languages
TypeScript, Python, Go, Rust, Java, C++ and C# stay byte-for-byte aligned from a single definition.
Idiomatic output
Records in Java, dataclasses in Python, serde in Rust. Generated code reads like a human wrote it.
Drift is impossible
The schema is the contract. Regenerate and every service agrees on the exact same shape.
Zero runtime
Generation happens at build time. No agents, no reflection, nothing shipped to production.
Diff-friendly output
Deterministic generation means clean git diffs. You review intent, never noise.
Catch drift in CI
A single check fails the build when generated code drifts from the schema, before it ever reaches main.
Open & pluggable
MIT licensed with a pluggable generator backend. Add a target language without forking the core.
Free to build with. Priced for teams.
The generator is open source and always will be. Paid tiers add a shared registry and review tooling when you outgrow a single repo.
Open Source
The full generator and all seven targets, no limits, MIT licensed.
- All 7 language targets
- Unlimited schemas
- CI drift checks
- Config + custom naming
- MIT licensed
Team
A hosted schema registry and PR review tooling for teams sharing types across repos.
- Everything in Open Source
- Hosted schema registry
- Versioned schema history
- Breaking-change diffs in PRs
- Priority support
Enterprise
Self-hosted registry, SSO, and compliance for large or regulated orgs.
- Everything in Team
- Self-hosted / air-gapped
- SSO + audit logs
- Custom language targets
- SLA + onboarding
Questions, answered
Everything you need to know before you run syln init.
Stop syncing types by hand
Install the CLI, write one schema, and let SyncLangs keep every language in your stack in agreement.