zChess Clock vs Flag
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
zChess Clock
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Keep your games moving with zChess Clock, a clean, chess clock that’s easy to use and fully customizable. Whether you’re blitzing with friends or testing long time controls, ChessClock has you covered. Features: • Classic and modern modes – choose from standard time controls or create your own. • Custom timers – add increment, delay, or Bronstein time delay. • Hourglass mode – watch time flow between players for a fast, dynamic feel. • Simple and stylish design – tap to switch turns, and focus on the fun. • Save your favorites – quickly load your most-used setups. Built for chess lovers who just want to hit play and start the clock. Ready? Tap, move, and let the games begin.
Flag
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A real chess clock, built for real chess players. Most apps stop at Fischer, swap your color every turn, and put Bronstein behind a paywall. Flag does all of it, without a subscription. FIVE INCREMENT MODES • Fischer — increment added after every move. OTB and online standard. • Delay (USCF) — clock pauses for a fixed delay before counting down. • Bronstein — used time returned at end of move, capped at the increment. • Hourglass — time flows from one side to the other. • Byo-yomi — Japanese overtime periods after main time runs out. DISPLAY & TAP • Split or Color display modes. • Tap your own half (chess tradition) or tap anywhere — your choice. • Persistent White/Black sides — they don't swap based on turn. ALSO IN FLAG • Full game history with per-move timing • Stats dashboard — averages, move-time charts, time-trouble heatmap • Pause, resign, agree-draw shortcuts • Customizable haptics and sounds • Custom time-control presets — bullet, blitz, rapid, classical, byo-yomi PRO — ONE-TIME UNLOCK. NO SUBSCRIPTION. 7-day trial of every Pro feature. After that, a one-time unlock keeps everything forever. No subscription. No ads. Pay once, own it. Pro adds Bronstein, Hourglass, and Byo-yomi modes; 12+ premium clock themes (Wood, Tournament felt, Brass DGT, Carrara Marble, Library, Fischer 72, Havana, Zen, Frost, Streamer, Neon and more); unlimited custom presets; and premium switch sounds. PRIVACY Privacy: https://bountyapps.com/flag/privacy.html Terms: https://bountyapps.com/flag/terms.html
Screenshots
Verdict
The clearest difference is in-app purchases: zChess Clock at none against Flag's 1. Flag's advantage is iOS requirement (18.6 vs 26.0). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Flag sells 1 one-off in-app purchase. zChess Clock asks for nothing beyond the download.
| Parameter | zChess Clock | Flag |
|---|---|---|
| Price | Free | Free |
| Update frequency | — | Every 2 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone | iPhone |
| Requires iOS | 26.0 | 18.6 — better |
| Further details — not scored | ||
| Size | 2 MB | 51 MB |
| Age rating | 4+ | 4+ |
| Developer | Benjamin Zobrist | Anton Voropaiev |
In-app purchases
zChess Clock
No in-app purchases
Flag
- Flag Pro$4.99








