Choosing an API
All Phrase APIs use REST over HTTPS and authenticate via OAuth 2.0 tokens issued by the Platform API. Choose the API that matches your use case:- Strings — key-based localization for software products; use when you need branching, version control, or multi-version release management.
- TMS — translation workflow automation; use when you need project management, job tracking, translation memory, or delivery pipelines.
- Language AI — MT/LLM aggregation and quality evaluation; use when you need to select the best machine translation output or score translation quality programmatically.
- Studio — audio and video transcription, translation, and dubbing; use for media content in 100+ languages.
- Connectors — custom integration flows; use when you need to connect Phrase to external systems beyond built-in integrations.
- Quality Evaluator — AI-powered translation quality checks; use when you need reusable quality profiles and segment-level evaluation.
- Style Guides — organization-wide writing guidelines; use when you need to keep translations and authored content on-brand with versioned, per-language style guides.
- Content Groups — organize projects, style guides, and style rules into groups; use when you need to coordinate workflows across multiple Phrase products.
Rate limits apply per API product. Check each product’s introduction page for specific limits before building high-volume integrations.
Platform
Platform APIs that provide unified authorization across Phrase products.
Strings
APIs for key-based product localization with branching and version control for multi-version releases at scale.
TMS
APIs to automate translation workflows (TMS: Translation Management System), from projects and jobs to translation memory and delivery at scale.
Language AI
APIs for aggregating MT (Machine Translation) and LLM (Large Language Model) providers, selecting the best output, and evaluating translation quality.
Studio
AI-powered audio and video processing for transcription, translation, and dubbing. Process content in over 100 languages with advanced features like glossaries and pronunciations.
Connectors
A tool for building custom flows using Phrase Integrations. Easily connect localization processes with external systems and extend built-in integrations with your own functionality.
Quality Evaluator
APIs for automatically assessing translation quality using LLM-powered checks resolved from Style Guide Rules and Content Groups.
Style Guides
Manage organization-wide writing guidelines that keep translations and authored content on-brand. Upload Markdown style guides per language and version every revision.
Content Groups
APIs for organizing platform objects — projects, style guides, and style rules — into content groups for coordinated workflows across Phrase products.