Type faster in Polytonic Greek than you do in English.

1. All ten classical marks.

   Smooth and rough breathings, acute, grave, and circumflex accents, iota subscript, diaeresis, macron, breve, and the philologist's underdot. Combine them freely. Mutually exclusive marks, like acute and grave, or macron and breve, never fight each other.

   

   iPhone iPad

2. Two ways to type.

   Enter a vowel first and decorate it with one tap, or queue up the diacritics you want and apply them all to the next vowel. Whichever mental model you prefer, Tonos follows along.

   

   iPhone iPad

3. Three layers, one keyboard.

   Letters uses the common Greek keyboard ;ςΕΡΤΥ layout. Numbers holds digits and punctuation, including ano teleia. Archaic holds rare letters from languages that use the Greek alphabet:

   • digamma (ϝ)
   • stigma (ϛ)
   • archaic koppa (ϙ)
   • koppa (ϟ)
   • sampi (ϡ)
   • san (ϻ)
   • heta (ͱ)
   • yot (ϳ)
   • sho (ϸ)
   • kai ligature (ϗ)
   • Pamphylian digamma (ͷ)

   Plus cursive and lunate letterforms, which are variant glyphs of standard Greek letters used in manuscripts and papyrology: β (ϐ), θ (ϑ), π (ϖ), κ (ϰ), ρ (ϱ), σ (ϲ), Θ (ϴ), ε (ϵ), along with reversed or dotted forms ϶, ͻ, ͼ, ͽ.

   

   iPhone iPad

4. NFC Unicode output.

   Canonically precomposed where Unicode provides a precomposed form. Characters like ἄ, ᾄ, ῶ, and ῷ drop cleanly into any app, document, or database. No legacy codepoints, no lookup tables, no surprises for your downstream tools.

5. Spacebar trackpad.

   Drag horizontally across the spacebar to slide the cursor through your text, one character at a time. Fast drags accelerate, so you can cover distance without leaving Tonos to adjust the cursor.

   

   iPhone iPad

One-time upgrade. No subscriptions, ever.

1. Auto-correct.

   Tap space, return, or punctuation and the keyboard silently replaces your word with its best polytonic match from a 1.3-million-entry dictionary merged from Classical, Koine, Byzantine, and Katharevousa corpora. A four-level picker in iOS Settings lets you pick how aggressive it is: Off, Diacritics only (keep the letters you typed, just add breathings and accents), Levenshtein 1 (also fix a single wrong, missing, or extra letter, and the default), or Levenshtein 2 (fix up to two letter errors). Candidates are rescored with an on-device language model and biased toward common iotacism pairs (ι/η/υ and ο/ω), so you never get nudged from the right word to a rarer one just because the edit distance ties.

   

   iPhone iPad

2. Typeahead.

   A suggestion bar above the keys offers up to six chips that adapt to what you are doing: spell-check candidates for the word you just typed, mid-word completions for the one you are typing now, and next-word predictions from an on-device trigram language model trained on about thirty million polytonic tokens across Ancient Greek, Byzantine, and 19th-century Katharevousa corpora. Tap a chip to insert it, or on iPad with a hardware keyboard, press Tab to commit the top suggestion and cycle through the rest. Breathings, accents, and iota subscript are preserved exactly as the model saw them.

   

   iPhone iPad

3. Style Preferences.

   Four editorial toggles tune how a word comes out after Auto-correct runs: the grave rule (word-final acute becomes grave mid-phrase, enclitic-aware: ἄνθρωπός τις, εἴ τις, λόγος ἐστί), iota subscript vs adscript, movable nu on sentence-final -ε and -σι, and elision of common particles and prepositions. A three-way picker sets the elision glyph: Koronis (᾽), Combined (a tight-to-letter manuscript style), or Apostrophe (’). Defaults follow mainstream Ancient Greek editorial convention, and every knob is configurable in iOS Settings → Tonos. Your preferences sync across all your devices via iCloud.

The polytonic dictionary and trigram language model that power Auto-correct and Typeahead are built by Dilemma, an open-source Greek lemmatizer.