Calculator x Calculator vs Zerosec Note
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculator x Calculator
This app displays two independent calculators on a single screen, allowing for increased work efficiency. It's designed to streamline calculations by offering dual functionality. Contact the developer via Twitter for feedback.
- Two independent calculators
- Simultaneous calculations
- Improved work efficiency
- Dual screen display
Read full descriptionHide full description
When you open the app, two calculators are displayed. Since each is an independent calculator, please use it to improve work efficiency. Please contact the review section or DM here. https://twitter.com/corasck
Zerosec Note
Read full descriptionHide full description
The 'Zerosec Note' app is a powerful tool designed to improve and enhance brain efficiency. It introduces an "extreme" method of note-taking to help users tackle challenges like slow thinking, difficulty gathering information, indecision, and procrastination. By "extreme," we mean you must complete one note in 1 minute and dedicate 10 minutes daily to write 10 notes. After several weeks of consistent practice, you'll notice significant improvements in your thinking abilities. The app draws inspiration from the bestseller "Zero Second Thinking" by Yuji Akaba, a former McKinsey consultant. In his book, Akaba shares how he used A4 paper to organize fragmented thoughts, focusing on 1-minute "mental exercises" to enhance thinking and boost productivity. The 1.0 release offers core features such as note-taking, countdown timers, viewing, and editing notes. Stay tuned for future updates with exciting new features!
Screenshots
Verdict
The clearest difference is update cadence: Zerosec Note at weekly against Calculator x Calculator's every 4 months. Calculator x Calculator's advantage is device support (3 vs 1) and iOS requirement (11.0 vs 16.4). On price, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Calculator x Calculator ships an update every 4 months, Zerosec Note weekly. Both last shipped on October 28, 2026.
| Parameter | Calculator x Calculator | Zerosec Note |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 11.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 18 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Kazuya Fujita | 崇旭 王 |
In-app purchases
Calculator x Calculator
No in-app purchases
Zerosec Note
No in-app purchases
Questions
Is Calculator x Calculator free?
Is Zerosec Note free?
Do Calculator x Calculator or Zerosec Note have ads?
Which is updated more often, Calculator x Calculator or Zerosec Note?
Other comparisons
