Comparison

でんたくん vs Rub Memo

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

Head to head
About

でんたくん

Features
Read full description

ただの電卓アプリですが、、 背景のグラデをお好みのデザインにしてみよう! 文字の配色とプッシュ音の設定もできます。

About

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.

Highlights
  • 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
Features
Read full description

■ Erase with Your Finger Turn on “Eraser” in the toolbar, then trace over the text you want to remove. Erase one character at a time without selecting a range. Rewrite as easily as rubbing out pencil marks on paper. If you erase too much, tap “Undo” to bring it back. ■ Meet Your Walking Cat A pixel-art cat strolls around your note screen. Choose from Calico, Black, or Robot, and enjoy 38 animations, including walking, jumping, and relaxing. Tap the cat to make it move out of your way. You can also turn it off in Settings. ■ Home Screen Widget Check the last note you opened right from your Home Screen. Tap the widget to open that note instantly. ■ More Features • Touch and hold paragraphs to move and reorder them • Insert tables, checklists, images, and hand-drawn sketches • Use the eraser to remove inserted items, including tables and images • Search all your notes with matching text highlighted • Lock individual notes with Face ID / Touch ID • Export and share notes as PDFs • Switch between Japanese and English • Adjust text size, fonts, ruled lines, and eraser width ■ No Ads, No In-App Purchases, No Account Required The app does not collect your data. Your notes are stored on your device and are never sent to external servers by the app.

Screenshots

でんたくん2 screens
Rub Memo4 screens

Verdict

The call

The clearest difference is update cadence: Rub Memo at every 6 days against でんたくん's every 34 months. でんたくん's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 16.0). On price, review sentiment, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

でんたくん ships an update every 34 months, Rub Memo every 6 days. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 5 level
でんたくん versus Rub Memo: the parameters behind the verdict, then further details
ParameterでんたくんRub Memo
PriceFreeFree
Positive reviews100.0% of reviews100.0% of reviews
Update frequencyEvery 34 monthsEvery 6 days — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13.0 — better16.0
Further details — not scored
Size2 MB14 MB
Age rating4+4+
Developeryusuke_sharp9thseiji honda

Customer experience

でんたくん

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Rub Memo

Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

でんたくん

No in-app purchases

None

Rub Memo

No in-app purchases

Questions

Is でんたくん free?
でんたくん is free to download, with no in-app purchases.
Is Rub Memo free?
Rub Memo is free to download, with no in-app purchases.
Do でんたくん or Rub Memo have ads?
Neither でんたくん nor Rub Memo shows ads.
Which is updated more often, でんたくん or Rub Memo?
でんたくん ships an update every 34 months, and Rub Memo every 6 days. Most recently, でんたくん was updated on November 1, 2026 and Rub Memo on October 31, 2026.

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