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Best Online Dictionary Apps

248+ iOS apps curated and reviewed

4.6 avg rating
20 free apps
Updated September 2026

Every iPhone needs a few good online dictionary apps. We benchmark 248+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.

Compare top Online Dictionary Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Dictionary.com: English WordsDictionary.com: English WordsFree4.8★ (328K)YesNoSep 2026
2Merriam-Webster DictionaryMerriam-Webster DictionaryFree4.8★ (324K)YesYesSep 2026
3Dictionary.Dictionary.Free4.8★ (15K)YesYesSep 2026
4Dictionary Offline - Dict BoxDictionary Offline - Dict BoxFree4.6★ (12K)YesYesSep 2026
5Oxford Dictionary & ThesaurusOxford Dictionary & ThesaurusFree4.6★ (29K)NoYesSep 2026
6WordWeb DictionaryWordWeb DictionaryFree4.6★ (268)NoNoAug 2026
7Dictionary Lao-onlineDictionary Lao-onlineFree—NoNoMay 2026
8Minimal DictionaryMinimal DictionaryFree—YesYesMay 2026

Top Picks for Online Dictionary

Dictionary.com: English Words#1

Dictionary.com: English Words by Curiosity Media

Dictionary, Thesaurus, Vocab
Editor's Choice
🔍 Reference
4.8😐(328K 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

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.

What We Love

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

Room to Improve

  • 🐛 Inconsistent search results and missing definitions
  • 💸 Aggressive ads even after paid upgrades
  • 🤯 Frequent crashes and performance issues
  • 🤔 Confusing layout changes and UI issues
  • 🤷‍♀️ Paid features not always working as expected
Merriam-Webster Dictionary#2

Merriam-Webster Dictionary by Merriam-Webster, Inc.

Strong Contender
🔍 Reference
4.8😊(324K ratings)
FreeAdsIn-App Purchases
#35in Reference
Merriam-Webster Dictionary screenshot 1
Merriam-Webster Dictionary screenshot 2
Merriam-Webster Dictionary screenshot 3
Merriam-Webster Dictionary screenshot 4

Access America's most respected dictionary, updated with new words and meanings. This app offers offline access, voice search, daily vocabulary challenges, and a thesaurus. It's designed for English language reference, education, and vocabulary enhancement.

What We Love

  • 🚀 Easy to use
  • 👍 Comprehensive definitions
  • 👍 Helpful thesaurus
  • 🚀 Offline access
  • 👍 Word of the day feature
  • 👍 Fun word games

Room to Improve

  • 🐛 Ads can be intrusive
  • 🐛 Difficulty closing ads
  • 🐛 Repetitive game questions
  • 🐛 Missing words in dictionary
  • 🐛 Unreasonable level progression in games
Dictionary.#3

Dictionary. by Farlex, Inc.

by TheFreeDictionary.com
Worth Considering
🔍 Reference
4.8😊(15K ratings)
FreeAdsIn-App Purchases
Dictionary. screenshot 1
Dictionary. screenshot 2
Dictionary. screenshot 3
Dictionary. screenshot 4
Dictionary. screenshot 5

Access a comprehensive dictionary, thesaurus, and translation tool with millions of definitions and synonyms. Explore specialty dictionaries, learn new words daily, and play word games. This app offers offline access and integrates seamlessly with other applications.

What We Love

  • 🚀 Comprehensive and detailed definitions
  • 👍 Helpful thesaurus and translation features
  • 🎮 Fun word games and activities
  • 📚 Vast amount of information beyond just definitions
  • 🔍 Easy to use and navigate

Room to Improve

  • 🔍 Cluttered interface with too many ads
  • 🐛 Occasional crashes and bugs
  • 🔍 Difficulty finding specific settings or features
  • 🔋 Drains battery life quickly

More Online Dictionary apps to explore

FAQ about Online Dictionary

What are the best online dictionary apps for iPhone?
Dictionary.com: English Words tops our online dictionary apps ranking as of September 2026, with a 4.8-star average from 328K App Store ratings, and it's free to download.
Yes — 20 of the top online dictionary apps we rank are free to download, including Dictionary.com: English Words and Merriam-Webster Dictionary.
Dictionary.com: English Words shows ads and has no in-app purchases, according to its App Store listing as of September 2026.
We track 248+ online dictionary apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
This app serves as a comprehensive English dictionary and thesaurus, offering over 2 million trusted definitions and synonyms. It aims to help users improve their English vocabulary, understanding, and writing skills through various features.
Key features include access to millions of definitions and synonyms, a 'Word of the Day' to expand vocabulary, example sentences to show word usage, audio pronunciations, grammar tips, and a search history to track learned words.

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