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Best Online Reference App

198+ iOS apps curated and reviewed

4.6 avg rating
19 free apps
Updated June 2026

With an average user rating of 4.6★, the online reference app category is one of the App Store's strongest. Browse all 198+ apps we track, sorted so the most loved ones surface first.

Top Picks for Online Reference App

Online Bible#1

Online Bible by Cross Link Services B.V.

Editor's Choice
📚 Books
4.8😊(1.9K ratings)
FreeAdsIn-App Purchases
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Discover a comprehensive Bible study app with advanced features for in-depth exploration of scripture and understanding the Word of God. Access various Bible versions, Greek and Hebrew analysis, commentaries, and more for free on your iPad or iPhone. Join a mission to support ministries and enhance your biblical study experience.

What We Love

  • 💻 Excellent for Bible study
  • 🔍 Powerful search and lookup features
  • 📚 Comprehensive Bible versions and resources
  • 🔑 Helpful Greek/Hebrew word definitions

Room to Improve

  • 🐛 Occasional crashes or freezes
  • 🔍 Limited search functionality compared to desktop version
  • 📱 Lacking some features of the desktop program
Essayist: Academic Writing App#2

Essayist: Academic Writing App by Essayist Software Inc.

APA, MLA, Chicago & More
Strong Contender
📊 Productivity
4.5😐(378 ratings)
FreeIn-App Purchases
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An academic writing app designed to assist users in creating essays and research papers in various citation styles such as APA, MLA, and Chicago format. Perfect for students and researchers looking to streamline their writing process and ensure proper formatting. Get started today and elevate your academic writing!

What We Love

  • 🚀 Easy to use
  • 👍 Helpful for academic writing
  • 🚀 Saves time on formatting
  • 👍 Accurate citations

Room to Improve

  • 🐛 Bugs and crashes
  • 💰 Expensive subscription
  • 🔒 Privacy concerns
uCentral™ for Institutions#3

uCentral™ for Institutions by Unbound Medicine, Inc.

Medical References and Tools
Worth Considering
🏥 Medical
4.9😊(3K ratings)
FreeAds
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This application provides medical references and tools for clinicians and trainees, offering access to Prime PubMed and exclusive journal search features. Users with institutional subscriptions can download content to their iOS devices and Mac computers at no cost. Contact your institution's librarian or system administrator to check subscription availability and access a wide range of medical reference materials.

What We Love

  • 💻 Comprehensive medical reference
  • 🔍 Excellent search functionality
  • 📚 Wide range of resources (journals, textbooks, etc.)
  • 🔍 Helpful for clinical work and education

Room to Improve

  • 🐛 Occasional crashes or stability issues
  • 🔑 Requires login/account setup
  • 🔍 Cluttered search/navigation at times

More Online Reference App apps to explore

4
Tasbih Counter Pro: Dhikr App
Tasbih Counter Pro: Dhikr App
Tasbih Counter Pro: Dhikr App
Digital Tasbih App For Dhikr
Free

A digital tasbih app for keeping track of prayers and dhikr, featuring customizable themes, vibration alerts, and the ability to save and continue dhikrs seamlessly. Available in multiple languages with backup options for saved dhikrs. Experience a convenient way to count prayers on your phone with Tasbih Counter Pro.

🔧 Utilities
(3.8K)
5
PEPID®
PEPID®
PEPID®
by PEPID, LLC
Free

PEPID provides healthcare professionals with comprehensive tools for patient care, including a vast drug database, medical calculators, high-res pill photos, and more. It offers updated information sourced from 12 healthcare associations and is tailored for various medical professionals. For questions or feedback, contact support@pepid.com.

🏥 Medical
(2.9K)
6
Wanly Online
Wanly Online
Wanly Online
Keep your family!
Free

Track your child’s online activities and keep your family secure with instant notifications and weekly reports. Add up to 2 family members for increased protection and peace of mind. Your family's safety is a top priority!

🔍 Reference
(1.3K)
7
CloudLibrary
CloudLibrary
CloudLibrary
browse, borrow and enjoy
Free

Browse, borrow, and enjoy with this must-have app for library users! Access your library card, borrow physical items, enjoy free eBooks, receive reminders, and explore digital content all in one place. Elevate your library experience today!

📚 Books
(53)
8
Libraries Online
Libraries Online
Libraries Online
by Capira Technologies, LLC.
Free

Take Libraries Online with you wherever you go and access a range of library services, including searching the catalog, reserving items, managing your account, and accessing online resources. Get started now and discover the convenience of having your library at your fingertips!

📚 Books
(111)
9
The Palace Project
The Palace Project
The Palace Project
by LYRASIS, Inc.
Free

Discover and enjoy thousands of books for free with an easy-to-use e-reader app connected to your local library. Access your library's collection or explore an extensive selection on the Palace Bookshelf, no library card required. Visit the Palace Project at https://thepalaceproject.org to learn more and start reading today!

📚 Books
(4K)
10
The ESO App Lite
The ESO App Lite
The ESO App Lite
Elder Scroll Online Companion
Free

An essential companion app for The Elder Scrolls Online community, allowing users to easily explore Tamriel, locate lore books, skyshards, and delves via maps or search function without requiring internet connection once downloaded. Simplifying gameplay experience with accurate locations and descriptions. Follow on Instagram for updates and enjoy this unofficial app by Nexu Industries Australia.

🔍 Reference
(338)
11
The ESO App
The ESO App
The ESO App
The Unofficial ESO Companion
$1.99

An essential companion app for The Elder Scrolls Online community, providing easy access to lore books, skyshards, crafting research, and more without requiring internet. Stay connected with all the latest updates and features, and manage your ESO Pro account for tracking character progress across devices. Download now and enhance your ESO experience!

🔍 Reference
(590)
12
Terminology
Terminology
Terminology
Dictionary•Thesaurus•Research
Free

Explore a comprehensive terminology dictionary with extensive definitions, synonyms, and related terms. Enhance your understanding of various concepts and expand your vocabulary effortlessly. Start discovering today!

🔍 Reference
(1K)
13
Library Online 2026
Library Online 2026
Library Online 2026
Watchtower & Daily Text
Free

Access a comprehensive online library with the latest features for research, study, and reference purposes. Explore a vast collection of resources with advanced search capabilities, bookmarking, and cross-referencing tools for a seamless user experience.

📚 Books
(1.5K)
14
Bible - Daily Bible Verse KJV
Bible - Daily Bible Verse KJV
Bible - Daily Bible Verse KJV
Holy Bible Study & Audio Books
Free

Get daily inspiration and guidance with a comprehensive Bible study app. Access daily Bible verses and deepen your understanding of the scripture.

🔍 Reference
(477K)
15
Find My Lost Device & Track
Find My Lost Device & Track
Find My Lost Device & Track
Airpod Tracker Locate Finder
Free

"Track and locate your missing devices with precision using FindOne. Never lose your items again - download now!"

🔧 Utilities
(1.9K)
16
Bible Widgets: Verses & Prayer
Bible Widgets: Verses & Prayer
Bible Widgets: Verses & Prayer
Daily Verse & Christian Quotes
Free

Get inspiring daily Bible verses and prayer devotions delivered to your Home and Lock screens, with customizable widgets, reminders, and offline access. Personalize your experience with themes, backgrounds, and collections, and share spiritual quotes with others.

🔍 Reference
(88K)
17
Dictionary.
Dictionary.
Dictionary.
by TheFreeDictionary.com
Free

Discover a comprehensive Dictionary and Thesaurus app with a Word of the Day feature, offline access, and resources from top sources. Access millions of definitions, synonyms, translations, and more for a versatile language tool.

🔍 Reference
(14K)
18
Citations
Citations
Citations
Lightweight reference creation
Free

This application helps users create properly formatted citations quickly and easily, with a simple and intuitive interface that works offline and prioritizes user privacy. It generates citations in various formats, is free to use with no ads or trackers, and is designed for Apple devices.

📊 Productivity
(16)
19
myLIBRO
myLIBRO
myLIBRO
Powered by ConverSight.ai
Free

Discover the ultimate voice-powered library assistant! Access resources, search catalogues, and engage with your library in a whole new way. Embrace the future of library interactions with myLIBRO - revolutionizing the way you access information.

📚 Books
(6.6K)
20
Tarteel: AI Quran Memorization
Tarteel: AI Quran Memorization
Tarteel: AI Quran Memorization
Memorize, Recite, Fix Mistakes
Free

"Enhance your Quran journey with an AI-powered app that helps you engage with the Quran through voice input. Get personalized support for memorization, recitation, and progress tracking. Join millions in strengthening your connection to the Quran. Try it now at http://feedback.tarteel.ai."

📚 Books
(10K)

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