Tolgee

Tolgee is the open-source translation management platform with the best developer experience — create translation keys via REST API, import existing JSON/XLIFF/PO files, configure machine translation (DeepL, Google Translate), and export translated files for build pipelines. For agents: automate translation key creation (POST /v2/projects/{id}/keys), bulk import new strings (POST /v2/projects/{id}/import), trigger machine translation on untranslated strings (POST /v2/projects/{id}/machine-translations), and export translated locale files (GET /v2/projects/{id}/export) for i18n bundling. In-context editing SDK for translator-friendly direct-on-page translation. Self-hosted or Tolgee Cloud. Confidence is docs-derived.

REST API at app.tolgee.io/api. Auth header: X-API-Key: {api_key}. Projects: GET /v2/projects lists projects. Keys: POST /v2/projects/{id}/keys creates a key with translations ({name: "app.title", translations: {en: "My App", es: "Mi App"}}). GET /v2/projects/{id}/keys lists all keys with translations (paginated). PATCH /v2/projects/{id}/keys/{key_id} updates a key. Translations: POST /v2/projects/{id}/translations sets multiple translations. GET /v2/projects/{id}/translations retrieves with language filter. Import: POST /v2/projects/{id}/import uploads JSON/XLIFF/PO/Android XML file. Export: GET /v2/projects/{id}/export?languages=es,fr&format=JSON returns translated files as ZIP. Machine translation: POST /v2/projects/{id}/machine-translations/untranslated triggers MT for all empty strings. CLI: npm install @tolgee/cli; tolgee push (upload) / tolgee pull (download) translated strings.

API key auth: X-API-Key: {api_key}. Keys from Tolgee → Project → Settings → API Keys (project-scoped) or Account Settings (account-scoped). HTTPS enforced in Tolgee Cloud. Self-hosted: configure TLS at reverse proxy. RBAC: project roles (owner, manager, translator, reviewer). SSO: available on paid plans. No OAuth2 for API. Self-hosted: full control over auth configuration. Rate limits: Tolgee Cloud applies per plan; self-hosted has no limits.

Import: async for large files — Tolgee queues large imports. Key conflicts: duplicate keys update existing translations (configurable conflict resolution). Export: synchronous ZIP download — large projects with many languages may take seconds. Machine translation quota: DeepL/Google MT credits consumed per character; monitor usage in Tolgee dashboard. SDK: @tolgee/react/@tolgee/angular etc. for in-context editing — loads translations from Tolgee API at runtime (configurable CDN cache). Self-hosted reliability: PostgreSQL + Spring Boot backend; scale horizontally for high-traffic setups. Tolgee Cloud uptime: status.tolgee.io.

tolgee.io/platform covers REST API reference, CLI documentation, SDK integration guides for all frameworks, machine translation setup, and self-hosting. Getting started (self-hosted): docker run tolgee/tolgee — UI at localhost:8080 in 2 minutes. Tolgee Cloud: free tier (1k strings/month). GitHub: tolgee/tolgee-platform (3k+ stars). Community via GitHub Discussions and Slack. Good documentation; REST API reference is thorough and well-organized.