Comparison

LEO Dictionary vs Thesaurus

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

Head to head
About

LEO Dictionary

Access extensive language dictionaries with example sentences and audio pronunciations. Improve your vocabulary with a spaced repetition system and get help with language questions in community forums.

Highlights
  • Extensive multilingual dictionaries
  • Audio pronunciation
  • Vocabulary trainer with spaced repetition
  • User-created wordlists
  • Language learning forums
  • Noun and verb tables
  • Grammar and etymology
Features
Read full description

This app offers free access to LEO's dictionaries, vocab trainer and forums. Are you in need of a reliable language reference? LEO’s comprehensive dictionaries include wide-ranging vocabulary, example sentences and audio pronunciation. Or would you like to take a foreign language to the next level? Why not try our vocab trainer with its tried-and-tested spaced repetition system. In LEOs Forum kannst du dir zudem Rat zu Sprachfragen holen, die über eine reine Wörterbuchfunktion hinausgehen. Our dictionaries contain around ­ 2,944,000 entries and is being updated as you read this. * English ⇔ German (840,000 entries) * French ⇔ German (280,000 entries) * Spanish ⇔ German (261,000 entries) * Italian ⇔ German (258,000 entries) * Chinese ⇔ German (238,000 entries) * Russian ⇔ German (373,000 entries) * Portuguese ⇔ German (171,000 entries) * Polish ⇔ German (99,000 entries) * English ⇔ Spanish (232,000 entries) * Spanish ⇔ Portuguese (77,000 entries) * English ⇔ French (61,000 entries) * English ⇔ Russian (54,000 entries) With LEO you can do more than just look up the meaning of a word in a different language. LEO also provides: * noun and verb tables * real voice audio pronunciation (no speech synthesis) * definitions * grammar and etymology, as well as other information relevant to the search term(s) including * orthographically similar words * possible base forms for inflected words * links to forum discussions containing the search term(s) Vocabulary trainer Our free vorab trainer is the perfect companion to build your vocabulary – whether at school or on your holidays. All you need is a free user account and you’re good to start your learning journey. * Use our curated wordlists to practice vocabulary used in German textbooks at secondary schools * Learn words with LEO’s spaced repetition system * Create your own wordlists – be it for school, for professional contexts or for your holidays * Set your learning targets and learn at your own speed * Enhance your language skills with a sustainable approach * Collect as many words and phrases as you like – there is no word limit even in the free version of our app Forums The LEO Forum exists to provide a platform for language-related questions that are not answered in the dictionary. If you would like to get help from other users or contribute to questions yourself, you need to register a user account (free of charge). The app contains adverts which you can choose to remove by subscribing to our ad-free version. https://www.apple.com/legal/itunes/appstore/dev/stdeula You can find a detailed description of all of our services on our website https://www.leo.org

About

Thesaurus

Easily look up synonyms for German words. This app utilizes the open-source OpenThesaurus.de database, a collaborative German dictionary for synonyms.

Highlights
  • Synonym lookup
  • German language support
  • OpenThesaurus.de database
  • Collaborative dictionary
Features
Read full description

Einfach Synonyme nachschlagen. Basiert auf openthesaurus.de OpenThesaurus ist ein freies deutsches Wörterbuch für Synonyme, bei dem jeder mitmachen kann.

Screenshots

LEO Dictionary4 screens
Thesaurus2 screens

Verdict

The call

The clearest difference is rating: LEO Dictionary at 4.0 against Thesaurus's 1.0. LEO Dictionary also leads on ratings volume (225 vs 1) and update cadence (every 3 weeks vs every 2 months). Thesaurus's advantage is in-app purchases (none vs 5) and ads (none vs shown). On price, device support and iOS requirement 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. LEO Dictionary sells 5 in-app purchases, starting at $7.49 per year. Thesaurus asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

LEO Dictionary holds the better App Store score, 4.0 against 1.0. That said, the two scores are not equally well evidenced: LEO Dictionary has 225 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 68% of LEO Dictionary's written reviews are positive against 100% of Thesaurus's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

LEO Dictionary ships an update every 3 weeks, Thesaurus every 2 months. The most recent releases landed on October 17, 2026 and September 20, 2026 respectively.

Scorecard7 real differences · 3 level
LEO Dictionary versus Thesaurus: the parameters behind the verdict, then further details
ParameterLEO DictionaryThesaurus
PriceFreeFree
Rating4.0 (225 ratings) — better1.0 (1 ratings)
Positive reviews67.6% of reviews100.0% of reviews — better
Number of ratings225 — better1
Update frequencyEvery 3 weeks — betterEvery 2 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.013.0
Further details — not scored
Size40 MB17 MB
Age rating4+4+
DeveloperLEO GmbHChristian Meindl

Customer experience

LEO Dictionary

All ratings225 ratings
Positive72.4%
Neutral8.4%
Negative19.1%
Written reviews488 reviews
Positive67.6%
Neutral9.0%
Negative23.4%

Thesaurus

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

LEO Dictionary

Reported bugs

4 issues
  • Search function not working reliably
  • App crashes when switching between languages
  • Saved word lists not syncing across devices
  • Inconsistent performance on older devices

Requested features

5 requests
  • Offline dictionary functionality
  • Improved word list management and editing
  • Customizable user interface and themes
  • Enhanced verb conjugation and grammar tools
  • Seamless integration with language learning apps

Thesaurus

Not enough reviews yet to summarise bugs or requests.

In-app purchases

5 purchases

LEO Dictionary

Subscriptions1
  • Ad-free annual subscription$7.491 Year
One-time4
  • Westermann Camden Town 5$8.95
  • Westermann Camden Town 6$8.95
  • Westermann Camden Town 7$8.95
Show 1 more
  • Westermann Camden Town 8$8.95
None

Thesaurus

No in-app purchases

Questions

Is LEO Dictionary free?
LEO Dictionary is free to download, with in-app purchases available.
Is Thesaurus free?
Thesaurus is free to download, with no in-app purchases.
Which has better reviews, LEO Dictionary or Thesaurus?
LEO Dictionary is rated higher. LEO Dictionary averages 4.0 out of 5 from 225 ratings, while Thesaurus averages 1.0 from 1 ratings.
Do LEO Dictionary or Thesaurus have ads?
LEO Dictionary shows ads; Thesaurus does not.
Which is updated more often, LEO Dictionary or Thesaurus?
LEO Dictionary ships an update every 3 weeks, and Thesaurus every 2 months. Most recently, LEO Dictionary was updated on October 17, 2026 and Thesaurus on September 20, 2026.

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