Calcat vs Rub Memo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calcat
A calculator app designed for cat lovers, featuring a cute cat sound when calculations are complete. It prioritizes ease of use with a clear display of input and results, allowing users to review their steps and correct mistakes.
- Cat sound on calculation
- Easy-to-use interface
- View calculation history
- Input process display
- General calculator mode
- Function calculator mode
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"Calcat" is a calculator for people who like cats. When you push the "="button, you hear a cute mew of the cat. Not only cute, it is a calculator sticking to ease of use. You can leave calculation results, see the process of input and immediately notice a mistake. This calculator calculates in input order like a general calculator. *General Calculator (calculation in input order) 1 + 2 × 3 = 9 [1 + 2 × 3 = 9] *Function Calculator 1 + 2 × 3 = 7 [1 + (2 × 3) = 7]
Rub Memo
This app allows you to erase text by rubbing your finger over it, mimicking the feel of erasing pencil on paper. It also offers a home screen widget for quick access, reordering paragraphs, and inserting various media like tables, checklists, and drawings.
- Erase text with finger rub
- Home screen widget for notes
- Reorder paragraphs by long-press and drop
- Insert tables, checklists, images, and drawings
- Full-text search with highlighted matches
- Lock notes with Face ID/Touch ID
- Export and share as PDF
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■ Rub to erase Turn on the "Eraser" in the toolbar and just rub your finger over the text you want gone. Characters fade away one by one — no selecting and deleting. It feels like rubbing out pencil on a paper notebook, right on your phone. ■ Home Screen widget Your most recent note appears in a Home Screen widget. Tap it to jump straight back in. ■ More features ・Long-press a paragraph to lift it, then drop it anywhere to reorder ・Insert tables, checklists, images, and finger drawings (you can erase those too) ・Full-text search with highlighted matches ・Lock individual notes with Face ID / Touch ID ・Export and share as PDF ・Switch between Japanese and English ・Adjust font size, font, ruled lines, and eraser width ■ No ads, no in-app purchases, no sign-up, no data collection. All your data stays on your device.
Screenshots
Verdict
The clearest difference is ads: Rub Memo at none against Calcat's shown. Rub Memo also leads on update cadence (every 6 days vs every 12 months) and review sentiment (100% vs 84%). On price, in-app purchases, device support and iOS requirement 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.
Calcat ships an update every 12 months, Rub Memo every 6 days. The most recent releases landed on October 17, 2026 and October 10, 2026 respectively.
| Parameter | Calcat | Rub Memo |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (105 ratings) — better | — |
| Positive reviews | 83.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 105 — better | — |
| Update frequency | Every 12 months | Every 6 days — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 16.0 |
| Further details — not scored | ||
| Size | 7 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | sky-nexus Inc. | seiji honda |
Customer experience
Calcat
Rub Memo
In-app purchases
Calcat
No in-app purchases
Rub Memo
No in-app purchases
