Best Online Dictionary Apps

228+ iOS apps curated and reviewed

4.7 avg rating
17 free apps
Updated June 2026

Every iPhone needs a few good online dictionary apps. We benchmark 228+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.

Top Picks for Online Dictionary

Dictionary.com: English Words#1

Dictionary.com: English Words by Curiosity Media, Inc.

Dictionary, Thesaurus, Vocab
Editor's Choice
🔍 Reference
4.7😐(19K ratings)
FreeAdsIn-App Purchases
Dictionary.com: English Words screenshot 1
Dictionary.com: English Words screenshot 2
Dictionary.com: English Words screenshot 3
Dictionary.com: English Words screenshot 4
Dictionary.com: English Words screenshot 5
Dictionary.com: English Words screenshot 6

Access the ultimate English language learning app packed with quizzes, games, and over 2 million definitions and synonyms. Enhance your vocabulary with word puzzles and daily challenges, enjoy dark mode, offline access, voice search, and more. Improve your English skills effortlessly!

What We Love

  • 🚀 Robust dictionary and thesaurus
  • 🤓 Helpful resources like blogs and articles
  • 💡 Useful word games and puzzles
  • 👍 Easy to use and navigate

Room to Improve

  • 🐛 Inconsistent search results and missing definitions
  • 💸 Aggressive ads even after paid upgrades
  • 🤯 Frequent crashes and performance issues
Merriam-Webster Dictionary#2

Merriam-Webster Dictionary by Merriam-Webster, Inc.

Strong Contender
🔍 Reference
4.9😊(3.2K ratings)
FreeAdsIn-App Purchases
#45in Reference
Merriam-Webster Dictionary screenshot 1
Merriam-Webster Dictionary screenshot 2
Merriam-Webster Dictionary screenshot 3
Merriam-Webster Dictionary screenshot 4

Access a premier iOS app for English language reference, education, and vocabulary building, with new word games and quizzes for learning. Features universal access, offline capabilities, voice search, daily word learning, thesaurus, example sentences, and pronunciations by real speakers. Enjoy features like favorite word syncing and Apple Watch integration. Subscribe to remove ads and access extra resources. Manage your subscription easily. Terms of Use: [Link to Terms of Use].

What We Love

  • 🚀 Easy to use
  • 👍 Comprehensive definitions
  • 👍 Helpful thesaurus
  • 🚀 Offline access

Room to Improve

  • 🐛 Ads can be intrusive
  • 🐛 Difficulty closing ads
  • 🐛 Repetitive game questions
Oxford Dictionary & Thesaurus#3

Oxford Dictionary & Thesaurus by MobiSystems, Inc.

Thesaurus & Offline Vocabulary
Worth Considering
🔍 Reference
4.6😐(28K ratings)
FreeAdsIn-App Purchases
#89in Reference
Oxford Dictionary & Thesaurus screenshot 1
Oxford Dictionary & Thesaurus screenshot 2
Oxford Dictionary & Thesaurus screenshot 3
Oxford Dictionary & Thesaurus screenshot 4
Oxford Dictionary & Thesaurus screenshot 5
Oxford Dictionary & Thesaurus screenshot 6

Access one of the highest authorities in language reference with the power of 15 major Oxford dictionaries at your fingertips. Explore advanced search and learning tools for a comprehensive linguistic experience.

What We Love

  • 👍 Reliable and simple to use
  • 👍 Comprehensive and best for all English, especially rare and aged language
  • 👍 Very useful for learning new words
  • 👍 Excellent reference app

Room to Improve

  • 🐛 Glitchy, way too many ads
  • 🔒 Annoying popup ads makes it unusable
  • 🔒 Ads stuck in, despite payment

More Online Dictionary apps to explore

4
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)
5
Dictionary Offline - Dict Box
Dictionary Offline - Dict Box
Dictionary Offline - Dict Box
Dictionary for All Languages
Free

Discover a comprehensive offline dictionary app for all languages with Dict Box. Access definitions, translations, and synonyms on-the-go. Download now for quick and easy language reference.

🔍 Reference
(11K)
6
Etymonline English Dictionary
Etymonline English Dictionary
Etymonline English Dictionary
Dictionary to Build Vocabulary
Free

A comprehensive English dictionary app offering word origins and vocabulary building tools. Features include instant search with spelling suggestions, offline dictionary access, related words, and premium ad-free and offline functionality. Explore word roots and enhance your vocabulary effortlessly.

📚 Education
(11K)
7
Dictionary and Thesaurus Pro
Dictionary and Thesaurus Pro
Dictionary and Thesaurus Pro
by TheFreeDictionary.com
$9.99

Access the premium ad-free Dictionary and Thesaurus Pro app by TheFreeDictionary.com for comprehensive offline dictionary and thesaurus content in multiple languages, including offline translations.

🔍 Reference
(2.5K)
8
Merriam-Webster Dictionary+
Merriam-Webster Dictionary+
Merriam-Webster Dictionary+
Premium Ad-free Dictionary
$9.99

Access a premium ad-free dictionary app for iPhone, iPad, and Apple Watch with offline capabilities, new word games, and features like integrated thesaurus, vocabulary-building quizzes, voice search, and word of the day. Perfect for English language reference and vocabulary building. Find out more by checking the Application License Agreement and App Privacy Policy.

🔍 Reference
(22K)
9
Spanish Dictionary - Dict Box
Spanish Dictionary - Dict Box
Spanish Dictionary - Dict Box
English Spanish Translation
Free

A powerful English to Spanish translation tool offering detailed definitions, examples, synonyms, and language learning features. Enhance your language skills and easily translate words and phrases on-the-go.

🔍 Reference
(8.3K)
10
Laban Dictionary
Laban Dictionary
Laban Dictionary
by VNG ONLINE CO.,LTD
Free

This offline dictionary app offers English-Vietnamese, Vietnamese-English, and English-English dictionaries with a user-friendly interface, allowing users to search, look up words using camera or speech-to-text, and learn English effectively. With extensive word entries, examples, and features like history and favourite tabs, it's a valuable tool for students preparing for English proficiency exams.

📚 Education
(32)
11
Hebrew Dictionary +
Hebrew Dictionary +
Hebrew Dictionary +
Translator to learn English
Free

An English to Hebrew and Hebrew to English dictionary app with offline capabilities, pronunciation, image text scanning, word games, flashcards, and phrase translations. Ideal for students, teachers, tourists, and language learners looking to improve vocabulary and language skills. Explore today for a comprehensive language learning experience!

📚 Books
(1.6K)
12
WordWeb Dictionary
WordWeb Dictionary
WordWeb Dictionary
Offline ad-free dictionary
Free

Discover a comprehensive offline dictionary and thesaurus with fast search, spelling suggestions, definitions, synonyms, and more. Enjoy ad-free browsing, usage examples, and unique search features without the need for an internet connection. Explore WordWeb Dictionary for a seamless word lookup experience.

🔍 Reference
(85)
13
WordReference Dictionary
WordReference Dictionary
WordReference Dictionary
by WordReference.com, LLC
Free

Access the powerful dictionary and translation tools of the most popular website with this app. Instantly look up translations in multiple languages, access forums with millions of Q&A, and utilize conjugators and synonyms. Don't misspell "WordReference" when searching!

🔍 Reference
(5)
14
Kurdish Dictionary - Dict Box
Kurdish Dictionary - Dict Box
Kurdish Dictionary - Dict Box
English Kurdish Translation
Free

A highly efficient English to Kurdish dictionary app with a vast vocabulary. Ideal for users seeking quick translations without any hassle. Download now for instant access to comprehensive language support.

🔍 Reference
(14K)
15
Greek Dictionary +
Greek Dictionary +
Greek Dictionary +
Translator to learn English
Free

A bilingual English to Greek and Greek to English dictionary app with offline capabilities, pronunciation, image text scanning, vocabulary games, and learning tools. Ideal for students, teachers, tourists, and language learners. Enhance your language skills and vocabulary effortlessly.

📚 Books
(869)
16
Advanced English Dictionary.
Advanced English Dictionary.
Advanced English Dictionary.
English Dictionary & Thesaurus
$2.99

Explore a comprehensive English dictionary app with advanced features for definitions, synonyms, and examples. Enhance your vocabulary and language skills with this user-friendly tool. Start expanding your English knowledge today!

🔍 Reference
(238)
17
Vietnamese Dictionary PEnglish
Vietnamese Dictionary PEnglish
Vietnamese Dictionary PEnglish
English Vietnamese Dictionary
Free

Access a comprehensive and innovative English-Vietnamese dictionary app with offline accessibility and advanced search features for free on the Appstore. Perfect for quick translations on-the-go!

📚 Education
(18K)
18
French Dictionary & Thesaurus
French Dictionary & Thesaurus
French Dictionary & Thesaurus
with English Translations
Free

Discover a comprehensive French language learning tool with features like translations, definitions, pronunciation guides, and example usage. Master the nuances of French effortlessly - try it out today!

🔍 Reference
(815)
19
Sesli Sozluk Dictionary
Sesli Sozluk Dictionary
Sesli Sozluk Dictionary
by Sesli Sozluk Ltd.
Free

Experience a leading dictionary app with a database of 20 million words in 20 languages, offering pronunciation, images, and videos to enhance learning. Access professional translation services and more. Make learning languages easy and enjoyable - try it today!

🔍 Reference
(9.9K)
20
Vietnamese Dictionary Dict Box
Vietnamese Dictionary Dict Box
Vietnamese Dictionary Dict Box
Engish Vietnamese Translator
Free

Access an all-in-one Vietnamese-English dictionary and translator app that offers offline access, effortless text translation, word suggestions, and more. Enhance your language learning with features like text-to-speech pronunciation, picture dictionary, and word reminders. Upgrade to Premium for an ad-free experience and additional benefits.

🔍 Reference
(18K)

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