Comparison

Thai Fast Dictionary vs Merriam

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Thai Fast Dictionary

Access an extensive offline dictionary with definitions and examples across multiple languages. An integrated AI chatbot offers instant assistance for clarifying terms, expanding vocabulary, and practicing pronunciation.

Highlights
  • Offline global standard database
  • Extensive word repository
  • Definitions and examples
  • Integrated AI chatbot
  • Instant assistance
  • Pronunciation practice
Features
Read full description

Thai Fast Dictionary is a Thai↔English dictionary built for speed. The entire dictionary lives on your device, so lookups are instant — no internet connection required. FEATURES • Instant Thai↔English word lookup, no waiting on a server • Clear definitions with parts of speech, example sentences, and synonyms • Search history and a favorites list, so you can find words you've looked up before • Two vocabulary games — Quiz and Hang Pig — to help you learn as you go • Works fully offline once installed Whether you're a Thai speaker learning English or an English speaker learning Thai, Thai Fast Dictionary keeps a complete dictionary in your pocket. Thai Fast Dictionary is free to use, supported by ads. An optional Advance Access subscription removes ads and unlocks unlimited daily lookups. Subscription terms: • Advance Access is available as a monthly or yearly auto-renewing subscription, billed to your Apple ID • Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period • Manage or cancel anytime in your Apple ID account settings • Payment is charged to your Apple ID account upon confirmation of purchase Privacy Policy: https://thaifastdict.com/privacy_policy.html Terms of Use: https://thaifastdict.com/term_of_use.html

About

Merriam

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.

Highlights
  • Offline dictionary access
  • Voice search for words
  • Daily Word of the Day
  • Vocabulary word games
  • Integrated thesaurus
  • Audio pronunciations
Features
Read full description

Get America's most useful and respected dictionary, optimized for your iPhone, iPad, and Apple Watch. Continuously updated with the newest words and meanings, this is the premier iOS app for English language reference, education, and vocabulary building. Key Features: * Offline access: Complete access to definitions and synonyms whether or not you're connected * Voice Search: look up a word without having to spell it * Word of the Day: learn a new word every day * Word Games: fun, fast quizzes to test your vocabulary * Favorite Words and Search History: keep track of the words that are most important to you * Favorite Word Syncing Through iCloud: share your favorites between devices and on the Web * In-app purchase: an ad-free experience + access to Kids, Medical, and Legal dictionaries * For Tablets: browse the entire dictionary with a scrolling index * Apple Watch Extension: see the Word of the Day and find watch-sized definitions with voice search Expert Word Guidance: * Integrated Thesaurus: more than 200,000 word choices with examples of their use * Example Sentences: understand how a word is used in context * Audio Pronunciations: voiced by real English speakers, not text-to-speech robots Terms of Use: https://www.merriam-webster.com/terms-of-use

Screenshots

Thai Fast Dictionary4 screens
Merriam4 screens

Verdict

The call

The clearest difference is ratings volume: Merriam at 328K against Thai Fast Dictionary's 1. Merriam also leads on review sentiment (83% vs 60%) and chart position (#37 vs unranked). Thai Fast Dictionary's advantage is rating (5.0 vs 4.8). On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Thai Fast Dictionary sells 7 in-app purchases, starting at $0.99 per month and Merriam sells 4 in-app purchases, starting at $1.79 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Thai Fast Dictionary holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Merriam has 328K ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 60% of Thai Fast Dictionary's written reviews are positive against 83% of Merriam's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Thai Fast Dictionary ships an update every 6 weeks, Merriam every 3 months. The most recent releases landed on September 24, 2026 and September 26, 2026 respectively.

Scorecard4 real differences · 7 level
Thai Fast Dictionary versus Merriam: the parameters behind the verdict, then further details
ParameterThai Fast DictionaryMerriam
PriceFreeFree
Rating5.0 (1 ratings) — better4.8 (328K ratings)
Positive reviews59.6% of reviews83.2% of reviews — better
Number of ratings1328K — better
Update frequencyEvery 6 weeks — betterEvery 3 months
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank—#37 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS14.0.0 — better15.0
Further details — not scored
Size143 MB255 MB
Age rating4+12+
DeveloperTHAI FAST COMPANY LIMITEDMerriam-Webster, Inc.

Customer experience

Thai Fast Dictionary

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews94 reviews
Positive59.6%
Neutral3.2%
Negative37.2%

Merriam

All ratings327,751 ratings
Positive96.7%
Neutral2.1%
Negative1.2%
Written reviews2,510 reviews
Positive83.2%
Neutral4.8%
Negative12.0%

Bugs and requests

Thai Fast Dictionary

Not enough reviews yet to summarise bugs or requests.

Merriam

Reported bugs

4 issues
  • App crashes when searching for certain words
  • Widget does not update daily word
  • Scribble feature is buggy
  • Inconsistent ad behavior

Requested features

5 requests
  • Add spelling correction suggestions
  • Improve word game timer and scoring
  • Expand etymology information
  • Add more languages beyond English
  • Improve widget functionality

In-app purchases

7 purchases

Thai Fast Dictionary

Subscriptions4
  • Advance features$0.991 Month
  • Offline IPA with no Ads$2.991 Year
  • English meaning and samples$2.991 Year
Show 1 more
  • Advance features$4.991 Year
One-time3
  • Point 1000 pts$2.99
  • Point 5500 pts$12.99
  • Point 12000 pts$29.99
4 purchases

Merriam

Subscriptions4
  • Premium Monthly$1.791 Month
  • Remove Ads$2.991 Year
  • All References + Remove Ads7 Days trial$5.991 Year
Show 1 more
  • Premium Annual7 Days trial$9.991 Year

Questions

Is Thai Fast Dictionary free?
Thai Fast Dictionary is free to download, with in-app purchases available.
Is Merriam free?
Merriam is free to download, with in-app purchases available.
Which has better reviews, Thai Fast Dictionary or Merriam?
Thai Fast Dictionary is rated higher. Thai Fast Dictionary averages 5.0 out of 5 from 1 ratings, while Merriam averages 4.8 from 328K ratings.
Do Thai Fast Dictionary or Merriam have ads?
Both Thai Fast Dictionary and Merriam show ads.
Which is updated more often, Thai Fast Dictionary or Merriam?
Thai Fast Dictionary ships an update every 6 weeks, and Merriam every 3 months. Most recently, Thai Fast Dictionary was updated on September 24, 2026 and Merriam on September 26, 2026.

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