Isokratis

Ison for Byzantine chant

A steady ison, in every mode, wherever you chant.

Tap a note and Isokratis holds it while you chant. Match the choir's pitch to the moria, and keep your chant books open right beside it.

Free to use. No account needed.

Made for chanters

Tap a note

The ison starts at once and holds until you tap the note again. Tap another note and it moves there.

Scale and sound

Choose the scale of the mode you are chanting, and how it sounds: a pure oscillator or recorded samples.

Match the choir

Move the pitch by a single moria, or by six (a semitone), until the ison sits right under the choir.

Phone or tablet

The layout fits any screen, in English, Greek, German, Spanish, Romanian, Bulgarian and Russian.

Premium

Your chant books, beside the ison

The Reader opens your PDF books right under the player, and your library syncs across your devices.

  • Bookmarks, favourites and your recent books
  • Paper-toned or dark pages, easy on the eyes in a dim church
  • Your books by their covers, with search by title
The Reader on a tablet and a phone: a chant book open under the ison keys

Free, with Premium when you want more

Free

€0forever

  • Ison with oscillator
  • Standard Byzantine scales
  • Pitch shift controls
  • Language selection
  • No account needed

Premium

€2.49per month

or €19.99 per year (save 33%)

14 days free · no card neededCreate an account and Premium is yours free for 14 days. No card needed, nothing renews.

  • Everything in Free
  • Reader: open your PDF scores beside the drone
  • Sync your settings, presets, samples and library across devices
  • Use custom audio samples as notes
  • Custom key/note layouts
  • Polyphonic mode: hold several notes at once
  • Advanced sound settings
  • Create & edit custom scales
  • Save & manage presets
  • Custom app colors

Prices include VAT. Google Play and the App Store show the price in your own currency. Subscribing needs an account.

Get Isokratis

Android

For Android phones and tablets, on Google Play.

Get it onGoogle Play

iPhone & iPad Coming soon

We're preparing the version for iPhone and iPad. Until it arrives, Isokratis is available on Android.

About me

I'm Konstantinos Chafis, a chanter at the Holy Church of the Transfiguration of the Saviour in Acharnes, Greece, and a student at the School of Byzantine and Traditional Music of Metamorfosi, whose website I also made. I graduated in Informatics and Telematics from Harokopio University.

I built Isokratis because I wanted an ison and a book reader that work as one, in a single app. No other app offers both, at the quality and completeness I'm aiming for.