Best Thesaurus Apps

175+ iOS apps curated and reviewed

4.7 avg rating
17 free apps
Updated May 2026

Looking for free thesaurus apps? 17 of our 175+ tracked titles are free to download — no subscription, no trial. The rest are premium picks worth paying for.

Compare top Thesaurus Apps (May 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Merriam-Webster DictionaryMerriam-Webster DictionaryFree4.8★ (323K)YesYesJul 2026
2Power ThesaurusPower ThesaurusFree4.8★ (2.9K)YesYesJul 2026
3Dictionary.com: English WordsDictionary.com: English WordsFree4.8★ (328K)YesNoJul 2026
4Oxford Dictionary & ThesaurusOxford Dictionary & ThesaurusFree4.6★ (28K)NoYesJul 2026
5Thesaurus dictionary- WordloopThesaurus dictionary- WordloopFree4.5★ (258)NoYesJul 2026
6Word HippoWord HippoFree4.9★ (14K)YesYesJul 2026
7Pocket ThesaurusPocket ThesaurusFree4.2★ (380)YesYesJul 2026
8Word of the Day・VocabularyWord of the Day・VocabularyFree4.7★ (38K)YesYesJul 2026

Top Picks for Thesaurus

Merriam-Webster Dictionary#1

Merriam-Webster Dictionary by Merriam-Webster, Inc.

Editor's Choice
🔍 Reference
4.8😊(323K 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

Room to Improve

  • 🐛 Ads can be intrusive
  • 🐛 Difficulty closing ads
  • 🐛 Repetitive game questions
Power Thesaurus#2

Power Thesaurus by Radyushin Pty Ltd

Comprehensive. Fast. Reliable.
Strong Contender
🔍 Reference
4.8😊(2.9K ratings)
FreeAdsIn-App Purchases
Power Thesaurus screenshot 1
Power Thesaurus screenshot 2
Power Thesaurus screenshot 3

Find accurate synonyms, antonyms, definitions, and related words with this comprehensive and fast thesaurus. Designed for writers, students, and professionals, it offers intuitive navigation and smart filters to help you express ideas clearly and confidently.

What We Love

  • ⭐ Invaluable tool for everyone
  • 🚀 Must have
  • ⭐ Superior
  • ⭐ Synonyms

Room to Improve

  • 🔌 Could be better
  • 🐛 Crashes
  • 🐛 Crashes the second you tried to open it
Dictionary.com: English Words#3

Dictionary.com: English Words by Curiosity Media

Dictionary, Thesaurus, Vocab
Worth Considering
🔍 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

Room to Improve

  • 🐛 Inconsistent search results and missing definitions
  • 💸 Aggressive ads even after paid upgrades
  • 🤯 Frequent crashes and performance issues

More Thesaurus apps to explore

4
Oxford Dictionary & Thesaurus
Oxford Dictionary & Thesaurus
Oxford Dictionary & Thesaurus
Etymology & Offline Vocabulary
Free

Access a vast collection of dictionaries and thesauruses with definitions, pronunciations, and etymology. Features include offline access, advanced search options, and personalized word lists. Ideal for students, professionals, and word enthusiasts.

15 Oxford DictionariesThesaurus integrationAudio pronunciations
🔍 Reference
(28K)
free with in-app purchases
5
Thesaurus dictionary- Wordloop
Thesaurus dictionary- Wordloop
Thesaurus dictionary- Wordloop
Synonyms power up vocabulary
Free

Enhance your writing by accessing a thesaurus directly from your keyboard. Select any word in any app to instantly see synonyms and related terms, helping you expand your vocabulary and refine your text. This ad-free tool offers a simple and effective way to improve your communication.

Keyboard thesaurus integrationInstant word suggestionsSynonym lookup in any app
🔍 Reference
(258)
free with in-app purchases
6
Word Hippo
Word Hippo
Word Hippo
Thesaurus and Word Reference
Free

This app offers a comprehensive suite of word tools, including an advanced thesaurus for synonyms and antonyms, example sentences, rhyming words, and word type identification. It also features word finders for games, definitions, and translations into numerous languages.

Advanced thesaurus with synonyms and antonymsExample sentences for word usageRhyming word finder
🔍 Reference
(14K)
free with in-app purchases
7
Pocket Thesaurus
Pocket Thesaurus
Pocket Thesaurus
The Ultimate Offline Thesaurus
Free

Expand your vocabulary and master the English language with this offline thesaurus. Quickly find synonyms and antonyms, explore word definitions, and enhance your writing and communication skills. Features include daily word challenges and advanced search options.

Extensive offline access to 90,000+ wordsFast and efficient synonym/antonym searchWord of the Day/Week from GRE list
🔍 Reference
(380)
free with in-app purchases
8
Word of the Day・Vocabulary
Word of the Day・Vocabulary
Word of the Day・Vocabulary
Vocab Builder & Word Games
Free

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.

Daily word insights with definitions and examplesVocabulary assessment and personalized learning plansWord games like Hangman and Gaps
📚 Education
(38K)
free with in-app purchases
9
Roget's II: New Thesaurus
Roget's II: New Thesaurus
Roget's II: New Thesaurus
Synonyms & Antonyms by UniDict
$4.99

Access a comprehensive English thesaurus with millions of synonyms and related terms. Enhance your vocabulary and express yourself more effectively with this powerful reference tool, featuring advanced search and offline capabilities.

Full text of Roget's II: The New ThesaurusMillions of synonyms and related termsReal-time progressive look-up
🔍 Reference
(351)
paid
10
Grammarly: AI Keyboard & Notes
Grammarly: AI Keyboard & Notes
Grammarly: AI Keyboard & Notes
Write, dictate, edit, improve
Free

Enhance your writing across all apps with AI-powered suggestions for grammar, spelling, and clarity. Generate new versions of your text, detect tone, and improve conciseness. Also includes a document editor and Safari extension for comprehensive writing support.

Real-time grammar and spelling suggestionsAI-powered text rewritesTone detection and transformation
📊 Productivity
(220K)
freemium
11
Interactive Thesaurus
Interactive Thesaurus
Interactive Thesaurus
Visual Dictionary & Thesaurus
$2.99

Explore word meanings and relationships with this smart English thesaurus. It helps you find suitable words, expand your vocabulary, and improve grammar through an intuitive interface with semantic relations and color-coded parts of speech. Offline access and sharing options are included.

200,000+ English words and definitionsVisual semantic relations between wordsColor coding for parts of speech
🔍 Reference
(747)
paid
12
Thesaurus Keyboard - Synonyms
Thesaurus Keyboard - Synonyms
Thesaurus Keyboard - Synonyms
Improve Your Vocab and Writing
Free

Enhance your vocabulary and writing with a powerful keyboard extension that provides instant access to synonyms and AI-powered word discovery. Features an intuitive interface, beautiful dark mode, and seamless integration with your favorite apps.

Intuitive thesaurus keyboard extensionAI-powered word discoverySeamless integration with other apps
📊 Productivity
(5)
free with in-app purchases
13
Advanced Dictionary&Thesaurus
Advanced Dictionary&Thesaurus
Advanced Dictionary&Thesaurus
English dictionary with Audio
Free

This comprehensive English dictionary and thesaurus offers precise definitions, synonyms, antonyms, and related words. It features intelligent search tools, offline audio, and customizable themes to enhance your language learning experience.

140,000+ definitionsSynonyms, antonyms, and related wordsOffline audio pronunciation
🔍 Reference
(4.3K)
free with in-app purchases
14
WordWeb Dictionary
WordWeb Dictionary
WordWeb Dictionary
Offline ad-free dictionary
Free

This app provides a comprehensive offline English dictionary and thesaurus with fast searching, spelling suggestions, definitions, and usage examples. It offers extensive word data and advanced search filters without requiring an internet connection.

Offline dictionary and thesaurusFast searchingSpelling suggestions
🔍 Reference
(267)
free
15
Multisaurus
Multisaurus
Multisaurus
A thesaurus with a difference!
Free

Explore word relationships beyond simple synonyms. Discover connections between synonyms of multiple words, find shared terms, and exclude specific related words to refine your vocabulary. Ideal for writers and students seeking precise language.

Connects to multiple thesaurusesFind synonyms of multiple wordsExclude synonyms of other words
🔧 Utilities
(230)
free with in-app purchases
16
Merriam-Webster Dictionary+
Merriam-Webster Dictionary+
Merriam-Webster Dictionary+
Premium Ad-free Dictionary
$9.99

Access America's leading dictionary with over 15,000 extra entries for people and places. Enjoy offline access, voice search, and daily vocabulary builders. This app offers expert word guidance with a thesaurus and example sentences.

Ad-free experience15,000+ premium entriesOffline dictionary access
🔍 Reference
(22K)
freemium
17
Thesaurus S
Thesaurus S
Thesaurus S
Simple synonym app
Free

This free reference app helps you find synonyms and related words from a large database. Its simple interface and voice input support make it easy to discover new expressions and enhance your vocabulary.

Extensive word database (>90,000 candidates)Simple and intuitive operabilityVoice input support
🔍 Reference
(0)
ad-supported
18
Terminology
Terminology
Terminology
Dictionary•Thesaurus•Research
Free

Explore the English language with this comprehensive tool. It offers dictionary and thesaurus functions, along with research capabilities to dive deeper into words and phrases. Extend its functionality with custom resources for web and app searches.

Offline U.S. English dictionarySynonyms, antonyms, and word relationsCustomizable resources for web and app searches
🔍 Reference
(1K)
freemium
19
Dictionary.
Dictionary.
Dictionary.
by TheFreeDictionary.com
Free

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.

Offline dictionary and thesaurusMillions of definitions and synonymsWord of the Day and Idiom of the Day
🔍 Reference
(14K)
free with in-app purchases
20
English Dictionary *
English Dictionary *
English Dictionary *
Thesaurus and Vocabulary words
Free

Enhance your English vocabulary with a comprehensive offline dictionary and thesaurus. Access over 500,000 words, their meanings, synonyms, antonyms, and pronunciations. Perfect for students and professionals to improve language skills anytime, anywhere.

Offline word searchSynonyms and antonymsWord definitions
🔍 Reference
(1.2K)
subscription

FAQ about Thesaurus

What are the best thesaurus apps for iPhone?
Merriam-Webster Dictionary tops our thesaurus apps ranking as of May 2026, with a 4.8-star average from 323K App Store ratings, and it's free to download.
Yes — 17 of the top thesaurus apps we rank are free to download, including Merriam-Webster Dictionary and Power Thesaurus.
Merriam-Webster Dictionary shows ads and offers in-app purchases, according to its App Store listing as of May 2026.
We track 175+ thesaurus apps on the iOS App Store as of May 2026, ranked by rating, recency, and analysis of real user reviews.
This app provides access to America's most respected dictionary, continuously updated with new words and meanings. It's designed for English language reference, education, and vocabulary building, offering features like offline access, voice search, and a thesaurus.
Key features include offline access to definitions and synonyms, voice search, a daily 'Word of the Day,' word games for vocabulary testing, favorite word tracking, and an integrated thesaurus with over 200,000 word choices. It also offers audio pronunciations by real English speakers.

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