Yes—you can use one Android phone as a shared chess clock for an over-the-board game. The practical setup is simple: open 1Chess Clock, put the phone where both players can read it, agree on the time control, and use the same tap-after-moving routine throughout the game. The app works offline and does not require an account, so the phone can stay beside the board rather than becoming a second online playing surface.
Prepare the phone and board
Put the phone in a central position that both players can reach without leaning across the board. Each player should be able to see their own time and identify which side is active. Before the game, agree who will make the first move and how the two players will handle an accidental tap. That small conversation is more useful than trying to settle a clock dispute after several moves.
Open the app before the pieces are arranged or while both players are still setting up. If you need to decide between 3+2, 5+0, 10+5, and 15+10, use the common time-control setup guide. For the basic screen and start flow, the getting-started guide is the shorter reference.
Set the time before the first move
Choose a preset or open Game settings and enter the agreed starting time. If the game uses Fischer increment or Bronstein delay, select the matching mode rather than relying on the numbers alone. Read both player panels before you start. A phone is convenient because the configuration is visible to both players, but that only helps when the players check the display together.
Make two practice moves while the clock is stopped or before the real game begins. Confirm which panel each player taps and whether the time changes as expected. With an increment, the added seconds should appear after the completed move; with a plain countdown, no seconds are added. If the result is not what the players announced, correct the setting now.
Use the same hand-over every turn
After you make a move, tap your own side of the clock. Your time stops and the opponent's side becomes active. The large player panels are intended for this quick hand-over; do not open settings in the middle of a game just to check what the clock is doing. The opponent should wait for the display to change before starting the next move.
This routine keeps a phone clock predictable even when the board is busy. If a tap is missed or made twice, stop and follow the rule agreed before the game. For a temporary interruption, use the central pause control rather than changing the time control; the pause and reset guide explains that distinction.
Make the phone part of the board setup
A phone clock works well for casual games, practice sessions, and clubs that want a readily available timer. A physical clock may still be preferable when the event requires dedicated hardware or a particular operating procedure. The phone-versus-physical-clock comparison helps you choose based on the setting, not on the assumption that one option fits every game.