Comparison

zChess Clock vs Flag

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

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.

About

Flag

Features
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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

zChess Clock3 screens
Flag4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Flag sells 1 one-off in-app purchase. zChess Clock asks for nothing beyond the download.

Scorecard2 real differences · 4 level
zChess Clock versus Flag: the parameters behind the verdict, then further details
ParameterzChess ClockFlag
PriceFreeFree
Update frequency—Every 2 days
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhoneiPhone
Requires iOS26.018.6 — better
Further details — not scored
Size2 MB51 MB
Age rating4+4+
DeveloperBenjamin ZobristAnton Voropaiev

In-app purchases

None

zChess Clock

No in-app purchases

1 purchases

Flag

One-time1
  • Flag Pro$4.99

Questions

Is zChess Clock free?
zChess Clock is free to download, with no in-app purchases.
Is Flag free?
Flag is free to download, with in-app purchases available.
Do zChess Clock or Flag have ads?
Neither zChess Clock nor Flag shows ads.

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