Comparison

RubiMask 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

RubiMask

Translate and read aloud text from physical books or documents using your device's camera. Tap any word for instant definitions and meanings within its sentence context. Supports various languages and text formats, including vertical Japanese.

Highlights
  • Live camera translation
  • Read aloud functionality
  • Tap-to-define word lookup
  • Furigana masking for Japanese
  • PDF and photo text extraction
  • Export text, PDF, or audio
Features
Read full description

Read books in any language — in your own language. Point your camera at a page, select a passage, and RubiMask translates it and reads it aloud. Tap any word to see what it means. Japanese novels, Chinese web fiction, English paperbacks, manga, textbooks, printed handouts: if it's on a page, you can read it. HOW IT WORKS 1. Scan a page with the camera, or open a photo or PDF 2. Drag over the passage you want to read 3. Listen to the translation — then tap words to learn them KEY FEATURES 【Just Point Your Camera】 - Hold your camera over a page and keep still: the page is read and translated right on screen, no photo needed - Reading Japanese? Hide furigana live with the camera, too 【Made for iPhone Duo】 - Half open: the page on top, the translation (or recognized text) below. Fully open: the page and its translation side by side - Furigana-free pages open as a two-page spread, like a real book (right to left for vertical Japanese) - The live camera shows the camera view and the translation together 【Translate Any Page】 - Detects the book's language automatically - Translates on your device with Apple's translation engine - Reads the translation aloud automatically, or plays the original for listening practice - Books already in your language are read aloud without translating 【Tap a Word, Get the Meaning】 - Every word in the passage is tappable - Shows the reading (hiragana for Japanese, pinyin for Chinese) and a quick translation - Look words up in the built-in iOS dictionary - On devices with Apple Intelligence, see what the word means in this exact sentence 【Made for Real Books】 - Built-in document scanner straightens and crops pages - Pinch to zoom in on small print, then select precisely - Vertical Japanese text supported, with furigana (ruby) ignored so it doesn't scramble the text - Save your book and pick up where you left off 【Furigana Masking & OCR Tools】 - Automatically mask furigana on vertical Japanese books - Extract text from PDFs and photos in many languages - Export as text, masked PDF, images, or audio (M4A) PERFECT FOR - Reading books in a language you're learning - Enjoying Japanese novels and manga before they're translated - Understanding textbooks, handouts, and printed documents - Listening to a page instead of reading it FREE & PREMIUM Free: 20 reads per day, and word meanings are always free. Premium: - Unlimited reading - Remove all ads - Unlimited pages (free: 100 pages) - Unlimited project saves (free: 3 projects) - PDF export - Audio export (M4A) Automatic translation requires iOS 18 or later. "In this sentence" meanings require a device with Apple Intelligence. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://keik.co.jp/rubimask/privacy-en.html

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

RubiMask4 screens
Go Clock Duo4 screens

Verdict

The call

The clearest difference is ads: Go Clock Duo at none against RubiMask's shown. RubiMask's advantage is update cadence (every 2 weeks vs every 2 months) and iOS requirement (17.0 vs 26.0). On price, in-app purchases 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. RubiMask sells 3 in-app purchases, starting at $2.99 per month and Go Clock Duo sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

RubiMask ships an update every 2 weeks, Go Clock Duo every 2 months. The most recent releases landed on November 9, 2026 and November 10, 2026 respectively.

Scorecard3 real differences · 6 level
RubiMask versus Go Clock Duo: the parameters behind the verdict, then further details
ParameterRubiMaskGo Clock Duo
PriceFreeFree
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 2 weeks — betterEvery 2 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 — better26.0
Further details — not scored
Size27 MB14 MB
Age rating4+4+
DeveloperKeiK LLCVincent Grellert

In-app purchases

3 purchases

RubiMask

Subscriptions2
  • RubiMask Premium$2.991 Month
  • RubiMask Premium7 Days trial$11.991 Year
One-time1
  • RubiMask Premium$19.99
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 RubiMask free?
RubiMask is free to download, with in-app purchases available.
Is Go Clock Duo free?
Go Clock Duo is free to download, with in-app purchases available.
Do RubiMask or Go Clock Duo have ads?
RubiMask shows ads; Go Clock Duo does not.
Which is updated more often, RubiMask or Go Clock Duo?
RubiMask ships an update every 2 weeks, and Go Clock Duo every 2 months. Most recently, RubiMask was updated on November 9, 2026 and Go Clock Duo on November 10, 2026.

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