Gawrshdarn
Text Analysis
Profanity detection, filtering, and playful word replacement
No keyCORSHTTPS
Free Text Analysis APIs
Free public APIs for text analysis, each one verified and kept up to date.
22 listed · 3 need no key · 5 work in the browser
LibreTranslate
Text Analysis
Translation tool with 17 available languages
No keyHTTPS
Yomi
Text Analysis
Japanese tokenizer and morphological analysis web API
No keyHTTPS
Audexum
Text Analysis
Text-to-speech REST API with 43 voices and 33 languages
API keyCORSHTTPS
GeoScore
Text Analysis
Score content for AI search citation readiness with a 0-100 GEO score and 8 structural metrics
API keyCORSHTTPS
Langbly
Text Analysis
Context-aware text translation and language detection for 100+ languages
API keyCORSHTTPS
Sentiment Analysis
Text Analysis
Multilingual sentiment analysis of texts from different sources
API keyCORSHTTPS
apilayer languagelayer
Text Analysis
Language Detection JSON API supporting 173 languages
OAuthHTTPS
Aylien Text Analysis
Text Analysis
A collection of information retrieval and natural language APIs
API keyHTTPS
Cloudmersive Natural Language Processing
Text Analysis
Natural language processing and text analysis
API keyHTTPS
Code Detection
Text Analysis
Detect, label, format and enrich the code in your app or in your data pipeline
OAuthHTTPS
Detect Language
Text Analysis
Detects text language
API keyHTTPS
ELI
Text Analysis
Natural Language Processing Tools for Thai Language
API keyHTTPS
Google Cloud Natural
Text Analysis
Natural language understanding technology, including sentiment, entity and syntax analysis
API keyHTTPS
Hirak Translation
Text Analysis
Translate between 21 of most used languages, accurate, unlimited requests
API keyHTTPS
Kiprio Translate
Text Analysis
Free text translation with language detection, supports 50+ languages
API keyHTTPS
Lecto Translation
Text Analysis
Translation API with free tier and reasonable prices
API keyHTTPS
Semantria
Text Analysis
Text Analytics with sentiment analysis, categorization & named entity extraction
OAuthHTTPS
Spam Hunter
Text Analysis
Free service to classify text for spam using ML
API keyHTTPS
Tisane
Text Analysis
Text Analytics with focus on detection of abusive content and law enforcement applications
OAuthHTTPS
Watson Natural Language Understanding
Text Analysis
Natural language processing for advanced text analysis
OAuthHTTPS
Watson Natural Language Understanding
Text Analysis
Natural language processing for advanced text analysis
OAuthHTTPS
All 22 Text Analysis APIs
- Gawrshdarn
- LibreTranslate
- Yomi
- Audexum
- GeoScore
- Langbly
- Sentiment Analysis
- apilayer languagelayer
- Aylien Text Analysis
- Cloudmersive Natural Language Processing
- Code Detection
- Detect Language
- ELI
- Google Cloud Natural
- Hirak Translation
- Kiprio Translate
- Lecto Translation
- Semantria
- Spam Hunter
- Tisane
- Watson Natural Language Understanding
- Watson Natural Language Understanding
Free Text Analysis APIs — common questions
Counts and timings below come from our own scheduled checks of this category.
How many free text analysis APIs are there?
We track 22 in this category, of which 18 responded at our last check. 3 of them need no API key.
Which text analysis APIs work without an API key?
3 of the 22 entries here need no credential. Filter this page by "no key" to see them, or browse the no-key collection for every keyless API across all categories.
Can I use these text analysis APIs in a browser app?
1 entries in this category need no key and return CORS headers, which is the combination that lets you call them straight from client-side JavaScript. The rest need a server or a proxy in between.
Which is the fastest free text analysis API?
Of the keyless options that responded at our last check, Gawrshdarn was quickest at a median 1028 ms. Speed is only one factor — coverage and licensing usually matter more — but it is measured here rather than claimed.
How do you know these APIs still work?
We call every listing on a schedule and record the status code, response time and whether CORS headers came back. Those results drive the badges on this page. Across the whole catalogue, 487 of 2,712 entries were not responding at the last full run, which is the sort of thing an unchecked list never tells you.