Best Reference Apps

Ad-free and free knowledge access60+ million articles in 300+ languagesPersonalized trending news feed

Access the world's largest free knowledge base with over 60 million articles in nearly 300 languages. Explore trending topics, save articles for offline reading, and customize your reading experience with various themes and text sizes. Contribute to the community by editing articles and participating in discussions.

Daily Study, Audio & Prayer

3,500+ Bible versionsAudio BiblesThousands of Reading Plans

Access a vast library of Bible versions in multiple languages, listen to audio Bibles, and engage in daily study with friends. Create prayers, add notes, and customize your reading experience with themes and verse images.

(14M)

Merlin Bird ID by Cornell Lab

Identify Birds You See & Hear

Identify birds by photoIdentify birds by soundAnswer simple questions for ID

Easily identify birds by sight or sound using advanced machine learning. Explore birds in your region, track your sightings, and learn about species with photos, sounds, and range maps. This free app from the Cornell Lab of Ornithology helps build your birding skills.

(111K)

NASA

by NASA

NASA+ video streaming21,000+ NASA imagesLatest NASA news

Explore the universe with access to live and on-demand NASA+ videos, a vast collection of stunning images, and the latest mission news. Discover interactive augmented reality experiences and track the International Space Station's path.

📚 Education

(64K)

Dictionary.com: English Words

Dictionary, Thesaurus, Vocab

2 million+ definitions and synonymsWord of the DayExample sentences

Access over 2 million trusted definitions and synonyms for English words. Enhance your vocabulary with daily new words, example sentences, and audio pronunciations. This app provides grammar tips and editorial content to deepen your understanding of the English language.

(328K)

Police Scanner Radio & Fire

Live Breaking News & Alerts

Live police and fire scanner broadcastsBreaking news alertsLocal and national event updates

Listen to live police, fire, and emergency radio broadcasts from around the world. Receive breaking news alerts and stay informed about local events and major national incidents in real time.

📡 News

(530K)

Indigo - Medical Reference

Knowledge at Your Fingertips

Internal medicine managementAnemia and lab abnormalitiesChronic condition management (e.g., AIDS/HIV)

A comprehensive medical reference for internal medicine, covering conditions from anemia to HIV/AIDS. It offers guidance for managing common ward and ICU cases, plus essential tips for new residents on consults and H&Ps. Designed for educational purposes for medical students and residents.

🏥 Medical

(14)

Word of the Day・Vocabulary

English Vocab Builder & Games

Daily word insights with definitions and examplesVocabulary assessment and personalized learning plansWord games like Hangman and Gaps

Enhance your vocabulary with daily words, engaging games, and personalized quizzes. This app offers expert-curated content and interactive challenges to make learning stick and improve your communication skills.

📚 Education

(39K)

Value Study: art reference

Analyze light and shadow

Step-by-step tone breakdownHighlighting areas of same valueFocus on light, shadow, and form

This app helps artists improve their skills by analyzing light and shadow in reference images. It allows users to break down tones step-by-step, from simple black and white to more complex value ranges, aiding in the understanding of depth and form. It's a tool to enhance traditional art studies.

🎨 Graphics & Design

(3.2K)

Text, Photo & Voice Translator

Google Translate

Text translationOffline translationInstant camera translation

Instantly translate text, voice, and images between hundreds of languages. Features include offline translation, real-time conversation translation, and the ability to save frequently used phrases.

(84K)

Pansophia: Science Reference

Science & Engineering Formulas

3,000+ biological species data1,200+ chemical compounds referenceExtensive engineering component data

Access a vast collection of STEM reference data, including species, chemical compounds, engineering components, and more, all in one place. Features include a scientific calculator, unit converter, and quiz tools. Explore 18 disciplines with extensive cross-references.

Nigeria’s Drug Reference Plus

Comprehensive drug product databaseEssential Medicines ListStandard Treatment Guideline recommendations

This app provides comprehensive drug and therapeutic information for Nigeria, including essential medicines, treatment guidelines, and drug product details. It features an interaction checker, diagnosis and management of prevalent diseases, and a natural health products compendium. Designed for healthcare professionals, it offers enhanced search and detailed drug information.

Identify over 800 bird species

Bird identification toolDetailed species profilesBird song and call audio

Identify North American birds with this comprehensive field guide. Features include a bird ID tool based on observations, detailed species information with photos and audio, and a personal sightings log. Discover nearby birding locations and connect with conservation efforts.

(4.5K)

Dino encyclopedia and quiz

Dinosaurs Reference Book

87 dinosaur descriptionsColorful imagesPronunciation audio

Explore a digital encyclopedia of 87 common dinosaurs and ancient reptiles, each with a colorful image and pronunciation guide. Test your knowledge with quizzes and spelling challenges to reinforce learning.

📚 Education

(2)

Mosby's Drug Reference

Over 5,000 Drug Listings

Over 5,000 drug listingsBlack Box Warnings and Safety AlertsDrug action, usage, dosage, interactions, side effects

This app provides healthcare professionals with comprehensive drug information, including actions, usage, dosage, interactions, and side effects. It emphasizes patient safety with Black Box Warnings, Safety Alerts, and information on life-threatening side effects. Features include custom notes, highlights, and quick search functionality.

🏥 Medical

(235)

Reference management on the go

References On Tap

Search academic databases (arXiv, Google Scholar, PubMed, etc.)Import reference information and PDFsOrganize references in static and smart groups

This app helps you find, display, and import reference information and PDFs from various academic databases. Organize your references into groups, perform advanced searches, and sync your library across devices. It offers both a one-time purchase for core features and a subscription for cloud syncing.

📊 Productivity

(295)

All-in-One Guitarist's Suite

Guitarist's Reference

$19.99

This comprehensive suite offers a vast collection of guitar chords, scales, and arpeggios with clear diagrams and detailed theory. It includes tools for finding chord-scale relationships, exploring alternate tunings, and even a virtual guitar for practice.

3000+ guitar chords with diagrams42 scale types including modes and pentatonicsArpeggio finder

🎵 Music

(16)