Tool catalog
30 tools available — call any of them with one UnifyAPI key.
Translate Text
Translate text between languages with high quality.
Author Details
Get author profile by Open Library Author ID — biography, birth/death dates, photo, Wikipedia link (Open Library / Internet Archive)
Book Search
Search 40M+ books by title, author, subject, or ISBN — ratings, cover images, edition counts, publish year (Open Library / Internet Archive)
Book Work Details
Get consolidated work metadata across all editions by Open Library Work ID — description, subjects, authors, cover, first publish date (Open Library)
Books by Author (Gutendex)
List all Project Gutenberg books by a specific author (search by name). Filter by language. Gutendex MIT
College Details (Scorecard)
Get detailed data for a US college by UNITID — admissions rate, costs, student outcomes, earnings after graduation (College Scorecard)
College Search (Scorecard)
Search US colleges and universities — admissions, tuition, enrollment, earnings, completion rates (College Scorecard)
DOI Lookup (CrossRef)
Resolve a DOI to full publication metadata — title, authors, journal, citations, funding, license (CrossRef)
Define a Word
Get word definition — phonetic pronunciation, part of speech, definitions with examples, synonyms, antonyms, audio URL. Supports 12 languages: en, es, fr, de, it, pt, ru, ar, hi, ja, ko, zh (Free Dictionary API)
Detect Language
Detect the language of text — returns language code and confidence score. Supports batch detection (Langbly)
Find Related Words
Find words by meaning, sound, rhyme, or spelling pattern. "happy" → pleased, blissful. "algorithm" rhymes → rhythm, logarithm. Great for writing, creative tasks, word games (Datamuse)
Get Bible Chapter Text
Fetch the verse-by-verse text of a Bible chapter for a given translation and book (e.g. KJV / John / 3). Returns array of {number, text}. Free Use Bible API
ISBN Book Lookup
Look up a book by ISBN-10 or ISBN-13 — title, author, publisher, pages, cover image, subjects. 40M+ books (Open Library / Internet Archive)
LibriVox Audiobook Detail
Get full audiobook details by LibriVox ID — includes per-section MP3 URLs (chapter-level streaming), playtimes, authors, and project metadata. LibriVox public domain
List Bible Commentaries
List available scholarly Bible commentaries (Matthew Henry, JFB, Gill, etc.). Each entry includes commentary ID, name, and language. Free Use Bible API
List Bible Translations
List 1000+ public-domain Bible translations across 429+ languages. Filter by ISO 639-3 language code or English name. Returns translation IDs needed for bible.passage. MIT-licensed open data (Free Use Bible API)
List Books in Bible Translation
List the books in a specific Bible translation (e.g. KJV → 66 books). Returns book IDs and chapter counts needed for bible.passage. Free Use Bible API
List Languages
List all 90+ supported translation languages with localized names. Specify display_language to get names in that language (Langbly)
Paper Details (OpenAlex)
Get full details for an academic paper by OpenAlex ID or DOI — authors, citations, abstract, references, open access links (OpenAlex)
Paper Search (OpenAlex)
Search 250M+ academic papers across all disciplines — citations, authors, institutions, open access status (OpenAlex)
Popular Public-Domain Books
List most-downloaded Project Gutenberg books, optionally filtered by language or topic. Gutendex MIT
Project Gutenberg Book Detail
Get full metadata + download URLs (EPUB, TXT, HTML, cover JPEG) for a Project Gutenberg book by numeric ID (e.g. 1342 = Pride and Prejudice). Gutendex MIT
PubMed Search (NCBI)
Search 36M+ biomedical and life science articles — clinical trials, reviews, meta-analyses with date and type filters (PubMed/NCBI)
Search LibriVox Audiobooks
Search 20K+ public-domain audiobooks by title, author, or genre. Returns book IDs, descriptions, languages, copyright years, total time, and ZIP download URLs. LibriVox public domain
Search Project Gutenberg
Search 78K+ public-domain books on Project Gutenberg by free-text query, language (ISO 639-1), topic, or author birth year. Returns book IDs, titles, authors, languages, subjects, download counts, and EPUB/TXT/HTML/cover URLs (Gutendex MIT)
Search Tatoeba Sentences
Search 13M parallel sentences across 429 languages (CC-BY 2.0 FR). Filter by source language, optional translation language, audio availability, and free-text keyword. Sort by relevance/random/created/modified. Tatoeba
Tatoeba Sentence Detail
Get a single Tatoeba sentence by ID with all translations and audio recordings. Useful for language-learning agents. Tatoeba CC-BY 2.0 FR
Tatoeba Supported Languages
List all 429 supported languages on Tatoeba with ISO 639-3 codes and sentence counts. Tatoeba CC-BY 2.0 FR
Translate Text
Translate text between 90+ languages — auto-detects source language, supports batch translation (array of strings), HTML format preservation. Google Translate v2 compatible. $5/1M chars (Langbly)
arXiv Search
Search 2.4M+ preprints in physics, math, CS, biology, and more — full text, authors, categories, PDF links (arXiv)