Comparison

igotimer vs Go Clock Duo

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

Head to head
About

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.

Highlights
  • Four time control modes
  • Customizable main time
  • Configurable byoyomi/kouryo time
  • Handicap settings
  • Audible countdowns (Japanese, English, beeps)
Features
Read full description

'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.

About

Go Clock Duo

Features
Read full description

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

igotimer3 screens
Go Clock Duo4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
igotimer versus Go Clock Duo: the parameters behind the verdict, then further details
ParameterigotimerGo Clock Duo
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 5 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad
Requires iOS9.2 — better26.0
Further details — not scored
Size2 MB14 MB
Age rating4+4+
DeveloperTakashi TakedaVincent Grellert

In-app purchases

None

igotimer

No in-app purchases

3 purchases

Go Clock Duo

Subscriptions2
  • Pro Monthly$0.991 Month
  • Pro Yearly$8.991 Year
One-time1
  • Byoyomi Timer Pro$24.99

Questions

Is igotimer free?
igotimer is free to download, with no in-app purchases.
Is Go Clock Duo free?
Go Clock Duo is free to download, with in-app purchases available.
Do igotimer or Go Clock Duo have ads?
Neither igotimer nor Go Clock Duo shows ads.
Which is updated more often, igotimer or Go Clock Duo?
igotimer ships an update every 5 months, and Go Clock Duo every 2 months. Most recently, igotimer was updated on November 1, 2026 and Go Clock Duo on November 10, 2026.

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