> ## Documentation Index
> Fetch the complete documentation index at: https://developers.phrase.com/llms.txt
> Use this file to discover all available pages before exploring further.
# API Reference
> Explore Phrase's APIs for localization and translation management — including Strings, TMS, Language AI, Studio, Connectors, Quality Evaluator, and Content Groups.
export const ContentGroupsLogo = () => {
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export const StyleGuidesLogo = () => {
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export const QualityEvaluatorLogo = () => {
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};
export const StudioLogo = () => {
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};
export const PlatformLogo = () => {
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};
export const ConnectorsLogo = () => {
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export const TmsLogo = () => {
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};
export const StringsLogo = () => {
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};
export const LanguageAiLogo = () => {
return ;
};
Phrase offers a suite of APIs to help you manage localization at scale - from translating dynamic content to integrating with your translation workflows.
## 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.} href="/en/api/platform/introduction">
Platform APIs that provide unified authorization across Phrase products.
} href="/en/api/strings/introduction">
APIs for key-based product localization with branching and version control for multi-version releases at scale.
} href="/en/api/tms/latest/introduction">
APIs to automate translation workflows (TMS: Translation Management System), from projects and jobs to translation memory and delivery at scale.
} href="/en/api/language-ai/introduction">
APIs for aggregating MT (Machine Translation) and LLM (Large Language Model) providers, selecting the best output, and evaluating translation quality.
} href="/en/api/studio/introduction">
AI-powered audio and video processing for transcription, translation, and dubbing. Process content in over 100 languages with advanced features like glossaries and pronunciations.
} href="/en/api/connectors/introduction">
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.
} href="/en/api/quality-evaluator/latest/introduction">
APIs for automatically assessing translation quality using LLM-powered checks resolved from Style Guide Rules and Content Groups.
} href="/en/api/style-guides/introduction">
Manage organization-wide writing guidelines that keep translations and authored content on-brand. Upload Markdown style guides per language and version every revision.
} href="/en/api/control-hub/introduction">
APIs for organizing platform objects — projects, style guides, and style rules — into content groups for coordinated workflows across Phrase products.