Mental Arithmetic Helper vs WatchNotes
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Mental Arithmetic Helper
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Calculator that can ask questions with random calculation formulas for mental arithmetic practice etc. >Mental arithmetic practice mode When you tap the mental arithmetic practice mode button, questions will be automatically asked at random. *Tap the mental arithmetic practice mode button again to return to a normal calculator.
WatchNotes
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Take your notes, documents, and PDFs anywhereβright on your wrist! WatchNotes (watch nots) is the ultimate companion app for students, professionals, and anyone who needs quick, private, and convenient access to text on their Watch. Whether you are studying for exams, looking up lecture sheets, or keeping reference materials handy, WatchNotes makes reading on a small screen incredibly comfortable and completely secure. HOW IT WORKS: Add or import your content on your phone, and it instantly syncs with your Watch using SwiftData and WatchConnectivity. Read, search, and navigate your documents with ease on watchOS. KEY FEATURES: STEALTH PRIVACY MODE (EXTREME PRIVACY) Need to quickly hide what you're reading? Our advanced Privacy Mode has your back. β’ Instantly activate by covering your screen with your palm, lowering your wrist, or double-tapping the screen. β’ Your text is immediately replaced by an innocent-looking digital watch face showing the current time. β’ Unlock and return to your notes with a secret 1.5-second long press. OCR TEXT SCANNER Turn physical paper into watch-ready digital notes. Use your iPhone's camera to scan hand-outs, textbook pages, whiteboards, or printed summaries, and watch them convert to searchable text instantly. WEB LINK PARSER Easily import online lectures, articles, or reference web pages. Simply paste the URL, and WatchNotes will extract the clean text content, stripping away ads and clutter. PDF & DOCUMENT IMPORT Directly import PDF, DOC, TXT, and general files. The app reads and formats text so it displays perfectly on watchOS. SMART WATCH LAYOUT & FORMATTING Say goodbye to horizontal scrolling. Long documents are automatically parsed into organized, structured chapters and digestible topics. β’ Support for Bulleted Lists β’ Support for complex Tables β’ Support for Math Formulas β’ Font size adjustments (pinch or scroll to resize text for comfortable reading) ADVANCED SEARCH & HIGHLIGHT Find what you need in seconds. Search through your notes on both iPhone and Watch with real-time text highlighting. NEAT ORGANIZATION Categorize your notes into folders: Lectures, Study, Cheat Sheets, or Uncategorized, so you always stay organized. Stay prepared, keep your documents close, and read on your own terms. Download WatchNotes today!
Screenshots
Verdict
The clearest difference is ads: WatchNotes at none against Mental Arithmetic Helper's shown. WatchNotes also leads on update cadence (daily vs fortnightly). Mental Arithmetic Helper's advantage is iOS requirement (15.8.3 vs 18.0). On price, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Mental Arithmetic Helper ships an update fortnightly, WatchNotes daily. The most recent releases landed on October 11, 2026 and October 6, 2026 respectively.
| Parameter | Mental Arithmetic Helper | WatchNotes |
|---|---|---|
| Price | Free | Free |
| Update frequency | Fortnightly | Daily β better |
| Ads | Yes | No β better |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod β better | iPhone, Apple Watch |
| Requires iOS | 15.8.3 β better | 18.0 |
| Further details β not scored | ||
| Size | 37 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Hideaki Uchikoshi | Ilia Evseev |
In-app purchases
Mental Arithmetic Helper
No in-app purchases
WatchNotes
No in-app purchases
Questions
Is Mental Arithmetic Helper free?
Is WatchNotes free?
Do Mental Arithmetic Helper or WatchNotes have ads?
Which is updated more often, Mental Arithmetic Helper or WatchNotes?
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