Use one app to look up any Greek or Latin word: Logeion was developed at the University of Chicago to provide simultaneous lookup of entries in the many dictionaries and reference works that make up the Perseus Classical collection. Most works represented in this app are based on digitized texts from the Perseus Digital Library at Tufts University. In addition, for frequent words, some frequency and collocation information is given plus examples from the corpus at

• Liddell and Scott's Greek-English Lexicon (1940)
• DGE (Diccionario Griego–Español). In progress; up to έξαυος.
• Autenrieth's Homeric Dictionary
• Slater's Lexicon to Pindar (1969)
• Liddell and Scott's Intermediate Greek Lexicon (1889)
• NEW: Woordenboek Grieks/Nederlands (in progress).

• Lewis and Short, Latin-English Lexicon (1879)
• NEW: The Dictionary of Medieval Latin from British Sources, ed. R. E. Latham, D. R. Howlett, & R. K. Ashdowne (London: British Academy, 1975-2013)
• Lewis's Elementary Latin Dictionary (1890)

The app draws data from the following Greek and Latin textbooks.
• NEW Frieze (rev. Dennison) Vergil’s Aeneid Books I-XII, with an Introduction, Notes, and Vocabulary
• Greek: An Intensive Course, by Hardy Hansen and Gerald M. Quinn
• Reading Greek: Grammar and Exercises, by Joint Association of Classical Teachers
• Learn to Read Greek, by Andrew Keller and Stephanie Russell
• Learn to Read Latin, by Andrew Keller and Stephanie Russell
• Introduction to Attic Greek (2nd edition), by Donald Mastronarde
• Wheelock's Latin, by Frederic M. Wheelock and Richard A. Lafleur
• Basiswoordenlijst Latijn [Basic Latin Vocabulary], by J.K.L. Babeliowsky, D. den Hengst, W. Holtland, W. van Lakwijk, J.Th.K. Marcelis, H. Pinkster, J.J.L. Smolenaars, Staatsuitgeverij (NEW: English translations of the example sentences)

What’s New

Version 2.0

• Simplified user interface for easier navigation.
• Added support for Slide Over and Split View Multitasking.
• Added recent searches above the word wheel.
• Added DMLBS, the Dictionary of Medieval Latin from British Sources, courtesy of the British Academy, as well as the first installments of the new Greek Dutch dictionary.
• Added lexicon on the Aeneid by Frieze (rev. Dennison), thanks to Christopher Francese at Dickinson College.
• Sentences from the Basic Latin Vocabulary have been translated into English.

Full bibliographic information and further information can be found by clicking the info button at the bottom of the word wheel. As always, please report problems through our “Report a Problem” link, which can also be found there.

Ratings and Reviews

4.5 out of 5
32 Ratings

32 Ratings

Brian W. Davidson ,

Almost perfect

The only thing keeping this app from being 5 stars is the small text size. Hoping to see the ability to adjust the text size in version 2.1.

This app is, however, such a quality piece of work. I don't know of a better free app on the market. As a matter of fact, if all you are looking for is a digital lexicon, Logeion is even better than the apps you pay for. It just works, and does so quickly.

If you read Greek or Latin, you gotta have Logeion.

dcreader6 ,

The one classics reference to get!

After having a few different Latin and Greek dictionary apps on my phone, I happened upon Logeion and was instantly won over.

Ease of use, selection of reference sources, comprehensiveness—it ticks all the boxes.

My go-to for any translating/reading as an advanced beginner working to learn both languages.

Alex Poulos ,

Marvelous App

The update is most welcome. My favorite lexical app has become even more useful. The multitasking functionality, though perhaps overdue, is fantastic.

Suggestions for future features:
• ability to choose default lexicon (eg, if I'm reading Homer, it would be nice to be able to make Autenreith the default.)
• modularity for the lexica (it would be nice to be able to remove the lexica you don't use)

Thanks for creating such a marvelous piece of software!


The University of Chicago
453.1 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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