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Phrase offers a suite of APIs to help you manage localization at scale - from translating dynamic content to integrating with your translation workflows.

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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.
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 AI-powered checks. Define custom quality requirements, organize them into reusable profiles, and evaluate translation segments at scale.