The great Greek and Latin dictionary web resource Logeion (discussed in this post) is also available as an iOS app.
App Store link: Logeion – The University of Chicago
Greek and Latin are entered in a single search field. One difference from the web version seems to be that Greek searches must be entered as Greek characters and without diacritics. This means that you can use the built-in iOS modern Greek keyboard. Once you type a couple of letters, the app will suggest words that you can select. This is a great time-saver.

The iOS app shares many of the features of the Logeion website. I will summarize briefly here and you can refer to the earlier post for more details on the specific features.
- Example passages

- Searches also access reference works on cultural topics, etc.
Additional information is available by tapping the icon of three grey bars at the upper left of the screen. This shows:
- Word frequency rank
- Authors who use the word often
- Collocations with other words
- Information on where the word appears in textbooks
- Words within dictionary entries can be selected and if the selected word has an entry of its own, you will see a “Look Up” button in the options bar. This should not be confused with the “Define” button that is part of iOS and links only to dictionaries enabled at the system level.
There is an impressive amount of functionality packed into this app. The onscreen display is very clear and readable given the length and complexity of many of the dictionary entries (note that the screenshots are all from an iPhone, not an iPad). This is probably the best option for a combined Ancient Greek and Latin dictionary on iOS.
App Store link: Logeion – The University of Chicago