Cornerstone Cards vs Rub Memo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Cornerstone Cards
This app helps trading card enthusiasts and sellers capture high-quality images of cards and their corners. It streamlines the process of showcasing card condition, enabling sellers to generate professional photos that build buyer trust.
- High-quality card image capture
- Focus on card corners
- Streamlines condition showcasing
- Professional photo generation
- Builds buyer trust
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Cornerstone is an app designed specifically for trading card enthusiasts and sellers. This app streamlines the process of showcasing the quality and condition of trading cards by focusing on capturing high-quality images of the card and its corners. The corners of a card are often the most scrutinized part when assessing its condition, and Cornerstone ensures that these critical details are highlighted with precision. By using Cornerstone, sellers can quickly and efficiently generate professional photos that accurately represent the state of their cards, making it easier to attract potential buyers and establish trust in the marketplace.
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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■ 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
Verdict
The clearest difference is update cadence: Rub Memo at every 6 days against Cornerstone Cards's every 3 weeks. Cornerstone Cards's advantage is device support (3 vs 1) and iOS requirement (13.4 vs 16.0). On price, ads, in-app purchases and monetization model 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.
Cornerstone Cards ships an update every 3 weeks, Rub Memo every 6 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.
| Parameter | Cornerstone Cards | Rub Memo |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 weeks | Every 6 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 13.4 — better | 16.0 |
| Further details — not scored | ||
| Size | 21 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Andrew Hicks | seiji honda |
Customer experience
Cornerstone Cards
Rub Memo
In-app purchases
Cornerstone Cards
No in-app purchases
Rub Memo
No in-app purchases









