Free AI APIs
Every API here is free outright or has a free tier. Limits differ a lot, so check the free tier column before you build on one.
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
AudexumText-to-speech in 43 voices and 32 languages, plus speech-to-text transcription in 100+ languages. AI & Machine Learning › Speech | Freemium | API key | JSON | — | Live |
CartesiaLow-latency text-to-speech over HTTP, SSE or WebSocket, plus speech-to-text and instant voice cloning. AI & Machine Learning › Speech | Freemium | API key | Binary | — | Live |
CloudmersiveDetects faces, objects, NSFW content, and generates image captions and OCR text from photos. AI & Machine Learning › Image Generation | Freemium | API key | JSON | <100/day | Live |
Cloudmersive Natural Language ProcessingSentiment, entity extraction, POS tagging, language detection and translation via one text API. AI & Machine Learning › Text Analysis | Freemium | API key | JSON | <100/day | Untested |
CohereChat, embeddings and rerank models for building search, RAG and conversational AI features. AI & Machine Learning › LLMs | Freemium | API key | JSON | <100/day | Live |
DeepLNeural translation of text and whole Word, PDF and PowerPoint files, with glossaries and style rules. AI & Machine Learning › Translation | Freemium | API key | JSON | — | Live |
Detect LanguageIdentifies the language of a text snippet from 216 supported languages, with a confidence score. AI & Machine Learning › Text Analysis | Freemium | API key | JSON | 1k–10k/day | Live |
DialogflowGoogle's NLU platform for building chatbots and voice agents: intents, entities, multi-turn dialogue. AI & Machine Learning › Text Analysis | Freemium | OAuth | JSON | 10k+/day | Untested |
ElevenLabsText-to-speech in 70+ languages with 10,000+ voices, plus speech-to-text, voice cloning and dubbing. AI & Machine Learning › Speech | Freemium | API key | JSON | — | Live |
FinSignalsClassifies Reddit and news posts about stocks into sentiment, bullish/bearish stance, and quality signals. AI & Machine Learning › Text Analysis | Freemium | API key | JSON | <100/day | Live |
Fish AudioText-to-speech with emotion tags, instant voice cloning from short clips, and transcription, billed per byte. AI & Machine Learning › Speech | Freemium | API key | Binary | — | Live |
FunTranslationsNovelty text translators (Yoda, Pirate, Morse code and 100+ more) via a paid REST API. AI & Machine Learning › Translation | Freemium | API key | JSON | — | Untested |
Google Cloud Natural Language APISentiment, entity, syntax and content-classification analysis for text via Google Cloud. AI & Machine Learning › Text Analysis | Freemium | OAuth | JSON | 100–1k/day | Live |
Google Cloud Translation APITranslate text and documents between 100+ languages with neural or LLM models, plus language detection. AI & Machine Learning › Translation | Freemium | API key | JSON | — | Live |
Google Cloud Vision APILabel images, locate objects, recognise landmarks and logos, detect faces and read text in photos. AI & Machine Learning › Image Recognition | Freemium | OAuth | JSON | <100/day | Untested |
Google GeminiGoogle's multimodal generative AI: text, image and code generation via Gemini models. AI & Machine Learning › LLMs | Freemium | API key | JSON | — | Live |
GroqOpenAI-compatible chat, speech-to-text and text-to-speech on open-weight models such as GPT-OSS and Whisper AI & Machine Learning › LLMs | Freemium | API key | JSON | — | Live |
HarnessRouterRuns managed coding-agent harnesses (Codex, Claude Code, Hermes) behind one API, billed per work-minute. AI & Machine Learning › LLMs | Freemium | API key | JSON | — | Untested |
Hugging Face Inference ProvidersOne key, one API routing chat, image, speech and embedding calls to 200+ models across providers. AI & Machine Learning › LLMs | Freemium | API key | JSON | — | Live |
IBM Watson Text to SpeechConverts text into natural-sounding speech in many languages and voices via IBM Watson. AI & Machine Learning › Speech | Freemium | API key | Binary | — | Untested |
ImaggaTags, categorizes, crops and moderates photos, plus face and text recognition, via REST calls. AI & Machine Learning › Image Recognition | Freemium | API key | JSON | <100/day | Untested |
LangblyTranslates text and documents with auto language detection; matches Google Translate v2's request format. AI & Machine Learning › Translation | Freemium | API key | JSON | — | Live |
languagelayerDetects which of 173 languages a piece of text is written in, with a confidence score. AI & Machine Learning › Text Analysis | Freemium | API key | JSON | <100/day | Live |
LanguageToolChecks grammar, spelling and style in 30+ languages; free public endpoint, paid API for scale. AI & Machine Learning › Text Analysis | Freemium | None | JSON | 10k+/day | Untested |
LlamaParseConverts PDFs, scans, Office files and spreadsheets to markdown or JSON, with tables and layout, for RAG. AI & Machine Learning › OCR | Freemium | API key | JSON | — | Live |
Magic HourGenerates and edits AI video, image, and audio content through credit-billed REST endpoints. AI & Machine Learning › Image Generation | Freemium | API key | JSON | — | Live |
MindsGenerates AI-simulated survey/interview responses from described audiences for market research. AI & Machine Learning › LLMs | Freemium | API key | JSON | — | Live |
Mistral AIMistral's chat, coding, OCR and Voxtral speech models, plus embeddings, with a no-card free mode for testing AI & Machine Learning › LLMs | Freemium | API key | JSON | — | Live |
MusicGPTAI audio API for text-to-music generation, remixing, text-to-speech and voice conversion. AI & Machine Learning › Speech | Freemium | API key | JSON | — | Untested |
OCR.spaceExtracts text and optional word positions from images and PDFs in 27 languages; can output searchable PDFs. AI & Machine Learning › OCR | Freemium | API key | JSON | 100–1k/day | Live |
OpenRouterOne OpenAI-compatible endpoint for 500+ models from many labs, with provider fallback and free models AI & Machine Learning › LLMs | Freemium | API key | JSON | <100/day | Live |
Picsart APIAI image/video editing API: background removal, upscaling, style transfer, and text-to-image generation. AI & Machine Learning › Image Generation | Freemium | API key | JSON | — | Live |
Pl@ntNetIdentifies plant species from 1–5 photos with confidence scores, plus disease and variety ID; 50+ languages. AI & Machine Learning › Image Recognition | Freemium | API key | JSON | 100–1k/day | Live |
PollinationsOne OpenAI-compatible gateway for image, text, video, audio and embedding models, billed in prepaid Pollen. AI & Machine Learning › Image Generation | Freemium | API key | JSON | — | Live |
PurgoMalumDetects and censors profanity/obscenity in text, including leetspeak substitutions, keyless. AI & Machine Learning › Moderation | Free | None | JSON | Unlimited | Live |
Roboflow UniverseLibrary of 1M+ open computer vision datasets and 250k+ trained models, runnable via a hosted inference API. AI & Machine Learning › Image Recognition | Freemium | API key | JSON | — | Untested |
SightengineDetect nudity, violence, weapons, hate symbols, AI-generated images and offensive text in user uploads. AI & Machine Learning › Moderation | Freemium | API key | JSON | <100/day | Live |
statlyteCurrent prices, context windows, and API IDs for 168 LLM models across 13 providers. AI & Machine Learning › LLMs | Freemium | None | JSON | 1k–10k/day | Live |
TisaneFlags hate speech, cyberbullying and other abusive text across 35 languages AI & Machine Learning › Moderation | Freemium | API key | JSON | — | Live |
ToHumanRewrites AI-generated text into natural, human-sounding prose using a self-hosted fine-tuned model. AI & Machine Learning › Text Analysis | Freemium | API key | JSON | — | Untested |
TranscriptFetchExtracts timestamped transcripts from YouTube, TikTok and Instagram videos, channels and playlists. AI & Machine Learning › Speech | Freemium | API key | JSON | <100/day | Live |
UnoRouterOpenAI-compatible gateway routing one API key across 200+ AI models from many providers. AI & Machine Learning › LLMs | Freemium | API key | JSON | — | Live |
Veryfi OCR APITurn photos and PDFs of receipts, invoices, checks, W-2s and bank statements into structured line-item JSON. AI & Machine Learning › OCR | Freemium | API key | JSON | <100/day | Live |
AudexumFreemiumLive
Text-to-speech in 43 voices and 32 languages, plus speech-to-text transcription in 100+ languages.
API key · JSON
—
llms.txt
CartesiaFreemiumLive
Low-latency text-to-speech over HTTP, SSE or WebSocket, plus speech-to-text and instant voice cloning.
API key · Binary
—
no machine-readable spec
CloudmersiveFreemiumLive
Detects faces, objects, NSFW content, and generates image captions and OCR text from photos.
API key · JSON
<100/day
OpenAPI spec
Cloudmersive Natural Language ProcessingFreemiumUntested
Sentiment, entity extraction, POS tagging, language detection and translation via one text API.
API key · JSON
<100/day
OpenAPI spec
CohereFreemiumLive
Chat, embeddings and rerank models for building search, RAG and conversational AI features.
API key · JSON
<100/day
no machine-readable spec
DeepLFreemiumLive
Neural translation of text and whole Word, PDF and PowerPoint files, with glossaries and style rules.
API key · JSON
—
OpenAPI spec
Detect LanguageFreemiumLive
Identifies the language of a text snippet from 216 supported languages, with a confidence score.
API key · JSON
1k–10k/day
no machine-readable spec
DialogflowFreemiumUntested
Google's NLU platform for building chatbots and voice agents: intents, entities, multi-turn dialogue.
OAuth · JSON
10k+/day
OpenAPI spec
ElevenLabsFreemiumLive
Text-to-speech in 70+ languages with 10,000+ voices, plus speech-to-text, voice cloning and dubbing.
API key · JSON
—
no machine-readable spec
FinSignalsFreemiumLive
Classifies Reddit and news posts about stocks into sentiment, bullish/bearish stance, and quality signals.
API key · JSON
<100/day
no machine-readable spec
Fish AudioFreemiumLive
Text-to-speech with emotion tags, instant voice cloning from short clips, and transcription, billed per byte.
API key · Binary
—
OpenAPI spec
FunTranslationsFreemiumUntested
Novelty text translators (Yoda, Pirate, Morse code and 100+ more) via a paid REST API.
API key · JSON
—
OpenAPI spec
Google Cloud Natural Language APIFreemiumLive
Sentiment, entity, syntax and content-classification analysis for text via Google Cloud.
OAuth · JSON
100–1k/day
OpenAPI spec
Google Cloud Translation APIFreemiumLive
Translate text and documents between 100+ languages with neural or LLM models, plus language detection.
API key · JSON
—
no machine-readable spec
Google Cloud Vision APIFreemiumUntested
Label images, locate objects, recognise landmarks and logos, detect faces and read text in photos.
OAuth · JSON
<100/day
no machine-readable spec
Google GeminiFreemiumLive
Google's multimodal generative AI: text, image and code generation via Gemini models.
API key · JSON
—
no machine-readable spec
GroqFreemiumLive
OpenAI-compatible chat, speech-to-text and text-to-speech on open-weight models such as GPT-OSS and Whisper
API key · JSON
—
llms.txt
HarnessRouterFreemiumUntested
Runs managed coding-agent harnesses (Codex, Claude Code, Hermes) behind one API, billed per work-minute.
API key · JSON
—
no machine-readable spec
Hugging Face Inference ProvidersFreemiumLive
One key, one API routing chat, image, speech and embedding calls to 200+ models across providers.
API key · JSON
—
MCP server
IBM Watson Text to SpeechFreemiumUntested
Converts text into natural-sounding speech in many languages and voices via IBM Watson.
API key · Binary
—
no machine-readable spec
ImaggaFreemiumUntested
Tags, categorizes, crops and moderates photos, plus face and text recognition, via REST calls.
API key · JSON
<100/day
no machine-readable spec
LangblyFreemiumLive
Translates text and documents with auto language detection; matches Google Translate v2's request format.
API key · JSON
—
MCP server · llms.txt
languagelayerFreemiumLive
Detects which of 173 languages a piece of text is written in, with a confidence score.
API key · JSON
<100/day
llms.txt
LanguageToolFreemiumUntested
Checks grammar, spelling and style in 30+ languages; free public endpoint, paid API for scale.
None · JSON
10k+/day
OpenAPI spec
LlamaParseFreemiumLive
Converts PDFs, scans, Office files and spreadsheets to markdown or JSON, with tables and layout, for RAG.
API key · JSON
—
no machine-readable spec
Magic HourFreemiumLive
Generates and edits AI video, image, and audio content through credit-billed REST endpoints.
API key · JSON
—
OpenAPI spec · llms.txt
MindsFreemiumLive
Generates AI-simulated survey/interview responses from described audiences for market research.
API key · JSON
—
OpenAPI spec · MCP server · llms.txt
Mistral AIFreemiumLive
Mistral's chat, coding, OCR and Voxtral speech models, plus embeddings, with a no-card free mode for testing
API key · JSON
—
OpenAPI spec
MusicGPTFreemiumUntested
AI audio API for text-to-music generation, remixing, text-to-speech and voice conversion.
API key · JSON
—
no machine-readable spec
OCR.spaceFreemiumLive
Extracts text and optional word positions from images and PDFs in 27 languages; can output searchable PDFs.
API key · JSON
100–1k/day
no machine-readable spec
OpenRouterFreemiumLive
One OpenAI-compatible endpoint for 500+ models from many labs, with provider fallback and free models
API key · JSON
<100/day
OpenAPI spec
Picsart APIFreemiumLive
AI image/video editing API: background removal, upscaling, style transfer, and text-to-image generation.
API key · JSON
—
no machine-readable spec
Pl@ntNetFreemiumLive
Identifies plant species from 1–5 photos with confidence scores, plus disease and variety ID; 50+ languages.
API key · JSON
100–1k/day
OpenAPI spec
PollinationsFreemiumLive
One OpenAI-compatible gateway for image, text, video, audio and embedding models, billed in prepaid Pollen.
API key · JSON
—
no machine-readable spec
PurgoMalumFreeLive
Detects and censors profanity/obscenity in text, including leetspeak substitutions, keyless.
None · JSON
Unlimited
no machine-readable spec
Roboflow UniverseFreemiumUntested
Library of 1M+ open computer vision datasets and 250k+ trained models, runnable via a hosted inference API.
API key · JSON
—
MCP server · llms.txt
SightengineFreemiumLive
Detect nudity, violence, weapons, hate symbols, AI-generated images and offensive text in user uploads.
API key · JSON
<100/day
no machine-readable spec
statlyteFreemiumLive
Current prices, context windows, and API IDs for 168 LLM models across 13 providers.
None · JSON
1k–10k/day
OpenAPI spec · llms.txt
TisaneFreemiumLive
Flags hate speech, cyberbullying and other abusive text across 35 languages
API key · JSON
—
OpenAPI spec
ToHumanFreemiumUntested
Rewrites AI-generated text into natural, human-sounding prose using a self-hosted fine-tuned model.
API key · JSON
—
no machine-readable spec
TranscriptFetchFreemiumLive
Extracts timestamped transcripts from YouTube, TikTok and Instagram videos, channels and playlists.
API key · JSON
<100/day
MCP server · llms.txt
UnoRouterFreemiumLive
OpenAI-compatible gateway routing one API key across 200+ AI models from many providers.
API key · JSON
—
MCP server · llms.txt
Veryfi OCR APIFreemiumLive
Turn photos and PDFs of receipts, invoices, checks, W-2s and bank statements into structured line-item JSON.
API key · JSON
<100/day
no machine-readable spec
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