ChessTools.it
Chess clock and Elo calculator
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
The tournament clock and FIDE Elo calculator from chesstools.it, now native on iPhone. Free, no account, no ads.
The two tools every over-the-board player needs, now native on your
iPhone. No account, no sign-up: clock and calculator both work offline.
CHESS CLOCK
A real tournament clock, not a toy timer.
- Read it from the side: both time displays turn a quarter turn, so the
two players read them from the board, the way a real clock sits to the
right of Black
- An analog clock face if you want one: a mechanical tournament dial
where the flag drops at twelve and the hands keep going (for time
controls without increment)
- 13 time controls, from 1-minute bullet to 90+30 classical, plus a
custom one you set yourself
- Fischer increment support
- Tap with any finger, even several at once - the clock never misses
a press
- When a flag falls the clock does not stop: a blinking flag appears
and play continues, exactly as on a real board
- Adjust either side's time and move count mid-game, for penalties
and corrections
- Move counter and side-to-move indicator for both colours
- Your last time control is remembered, so you start where you left off
- The screen stays awake while the clock runs
FIDE ELO CALCULATOR
The same calculator used on chesstools.it, packaged natively.
- Rating change with the correct K-factor, including the automatic
reduction rules
- FIDE performance rating, expected score against the field, and how
your result compares to your rating
- Per-game breakdown of every opponent
- Export the whole report as a PDF (requires a connection)
TOURNAMENT TOOLS
Quick access to the pairing and tournament tools on chesstools.it.
Free. No advertising.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
A small fix for long time controls. With 1h 30min + 30 sec the time is seven
characters long, and with the numbers turned it could run over the time control
label at the bottom of each side. The label now sits to the side, clear of the
digits, whether the clock is stopped or running.
The developer, Giorgio Donnoli, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- User Content
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Giorgio Donnoli
- Size
- 3 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Giorgio Donnoli