igotimer vs Go Clock Duo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
igotimer
This application serves as a game clock specifically designed for the board game Go. It offers multiple time control modes, customizable settings for main time and overtime periods, and audible countdowns in various languages or beeps.
- Four time control modes
- Customizable main time
- Configurable byoyomi/kouryo time
- Handicap settings
- Audible countdowns (Japanese, English, beeps)
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'IgoTimer' is a game clock application(App) used in Go(game). - The App has four modes of Time Controls (Sudden death, Byo-yomi, Kouryo-time and Canadian overtime). - You can set up the main time, the byoyomi time, the kouryo time and the handicap. - Counting the seconds (byoyomi, kouryotime) in Japanese, English or beeps is available.
Go Clock Duo
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The Go clock that speaks byo-yomi. Digits large enough to read across a goban, two halves facing opposite directions, and tap zones you can hit without looking down. Byoyomi Timer turns your iPhone or iPad into the clock your club has always needed. TIME SYSTEMS • Japanese byo-yomi — main time plus numbered periods that reset in full with every completed move • Canadian overtime — stone-based blocks such as 25 stones in 10 minutes, with a tappable stone counter • Fischer bonus time — with optional cap, the current AGA standard • Ing overtime — three purchasable periods, two penalty points each • NHK format — 30 seconds a move backed by ten one-minute reserves • Progressive overtime — the stone quota grows with each block • Sudden death — a plain absolute limit PRESETS FOR EVERY OCCASION Blitz, quick game, club standard, tournament, tournament Canadian, AGA bonus time, NHK style, professional game, title match and Ing official. Edit any of them, or build and name your own. A VOICE THAT COUNTS FOR YOU The last ten seconds of every period are announced aloud, so you can keep your eyes on the board. Available in English, German, Japanese, Korean and Mandarin — chosen independently of the interface language. Prefer beeps, or silence? Both are one tap away. PASS BUTTONS Two consecutive passes stop the clock, exactly as the game does. TEACHING GAMES AND HANDICAPS Both clocks are fully independent. Different systems, different times, different period counts on each side — a teacher can play three minutes against a student's forty. FOR REFEREES Time, periods and stones can all be corrected mid-game without restarting. WORKS ANYWHERE Fully offline, even in airplane mode. Runs on the Lock Screen as a Live Activity. No account, no ads, no tracking. Your settings and history stay on your device. ALSO AT HOME WITH Shogi, chess, Xiangqi, Gomoku and any other two-player board game — byo-yomi is the Shogi standard, and Fischer and sudden death come from chess. FREE AND PRO The core clock — byo-yomi, Canadian, Fischer, sudden death and per-move play — stays free, without ads and without a time limit. Pro adds custom time systems, tournament presets, independent clocks for teaching games, fifteen further colour themes, sound packs, landscape mode, saved setups and game history. Available monthly, yearly, or as a one-time lifetime purchase. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://byoyomitimer.com/privacy/
Screenshots
Verdict
The clearest difference is in-app purchases: igotimer at none against Go Clock Duo's 3. igotimer also leads on iOS requirement (9.2 vs 26.0). Go Clock Duo's advantage is update cadence (every 2 months vs every 5 months). 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. Go Clock Duo sells 3 in-app purchases, starting at $0.99 per month. igotimer asks for nothing beyond the download.
igotimer ships an update every 5 months, Go Clock Duo every 2 months. The most recent releases landed on November 1, 2026 and November 10, 2026 respectively.
| Parameter | igotimer | Go Clock Duo |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 9.2 — better | 26.0 |
| Further details — not scored | ||
| Size | 2 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Takashi Takeda | Vincent Grellert |
In-app purchases
igotimer
No in-app purchases
Go Clock Duo
- Pro Monthly$0.991 Month
- Pro Yearly$8.991 Year
- Byoyomi Timer Pro$24.99








