Text analysis APIs perform natural language processing tasks like sentiment analysis, entity extraction, and language detection. Add intelligent text processing to your applications.
Last verified: November 12, 2026
| Name | Description | Auth | HTTPS | CORS | Uptime (30 days) |
|---|---|---|---|---|---|
| AI Translate text API | The Text Translation API translates text into any of the 80 supported languages, providing accurate and context-aware translations | apikey | Yes | yes | 100% (5 checks) |
| Analyse Keywords API | This API lets you extract high-frequency keywords, key phrases and latent semantic keywords from any URL | apikey | Yes | yes | 100% (5 checks) |
| apilayer languagelayer | Language Detection JSON API supporting 173 languages | oauth | Yes | unknown | 100% (5 checks) |
| Audexum | Text-to-speech REST API with 43 voices and 33 languages | apikey | Yes | yes | 100% (5 checks) |
| Cloudmersive Natural Language Processing | Natural language processing and text analysis | apikey | Yes | yes | 100% (5 checks) |
| Convert Text to Speech API | This API converts any text to speech automatically | apikey | Yes | yes | 100% (5 checks) |
| Detect Language API | This API detects the language from any text (+ 50 languages supported) | apikey | Yes | yes | 100% (5 checks) |
| eidosSpeech | Free text-to-speech API with 1,200+ neural voices in 75+ languages | apikey | Yes | yes | 100% (5 checks) |
| ELI | Natural Language Processing Tools for Thai Language | apikey | Yes | unknown | 100% (5 checks) |
| Fuzzy Text Search API | The Fuzzy Text Search API finds close matches for user queries, handling typos and partial inputs to deliver relevant results quickly and accurately | apikey | Yes | yes | 100% (5 checks) |
| GeoScore | Score content for AI search citation readiness. Returns a 0-100 GEO score, 8 structural metrics, and improvement fixes | apikey | Yes | yes | 100% (5 checks) |
| Google Cloud Natural | Natural language understanding technology, including sentiment, entity and syntax analysis | apikey | Yes | unknown | 100% (5 checks) |
| Kiprio Translate | Free text translation with language detection, supports 50+ languages | apikey | Yes | yes | 80.0% (5 checks) |
| Langbly | Context-aware text translation and language detection for 100+ languages | apikey | Yes | yes | 100% (5 checks) |
| LanguageTool | Style and Grammar Checker for 25+ Languages | none | Yes | unknown | 100% (5 checks) |
| Lecto Translation | Translation API with free tier and reasonable prices | apikey | Yes | yes | 100% (5 checks) |
| LibreTranslate | Translation tool with 17 available languages | none | Yes | unknown | 100% (5 checks) |
| Proofread and Grammar Check API | The Proofreading and Grammar Check API ensures the provided text is grammatically correct and polished by automatically proofreading and checking for errors | apikey | Yes | yes | 100% (5 checks) |
| Semantria | Text Analytics with sentiment analysis, categorization & named entity extraction | oauth | Yes | unknown | 100% (5 checks) |
| ToHuman | Rewrite AI-assisted drafts into natural, human-sounding text that reads like you wrote it | apikey | Yes | unknown | 100% (5 checks) |
| Unprofane | Profanity and toxicity checks in 17 languages that read leetspeak, look-alike letters and spacing, with a Perspective API compatible endpoint | apikey | Yes | yes | 100% (5 checks) |
| Watson Natural Language Understanding | Natural language processing for advanced text analysis | oauth | Yes | unknown | 80.0% (5 checks) |
2 of these APIs require no authentication — you can start making requests immediately without signing up for an account. Just pick one from the table above, check its documentation, and send your first request.
17 APIs in this category require a free API key. This usually means creating a free account on the provider's website and copying your key from the dashboard. The process typically takes less than a minute.
Not sure where to start? Check the uptime column: it shows how often each API's documentation responded to our daily checks over the last 30 days, and the dot shows whether it responded at the latest check. For browser-based projects, check that the API supports CORS.
Yes, all APIs listed on API Bouncer have a free tier. Some are completely open (no sign-up needed), while others require a free account to get an API key. Free tiers typically have rate limits — check each API's documentation for specifics.
It depends on your needs. Consider: Do you need authentication or prefer no-auth? Does your project need CORS support for browser access? How many requests will you make? Start with a no-auth API to prototype quickly, then switch to a more feature-rich option if needed.
We run periodic health checks on all listed APIs. The "Status" column shows whether each API was responding at our last check. APIs marked as "alive" were recently verified. You can also test any API yourself using curl or our guides on testing APIs.
Most free APIs allow commercial use, but terms vary by provider. Always check the specific API's terms of service. Some APIs have separate free and commercial tiers with different rate limits.
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