Mnemonizer vs Columns.app
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Mnemonizer
This app offers a unique method to secure sensitive information like PINs and passwords by disguising them within a visually camouflaged grid of random characters. It allows users to create mnemonic cards, mentally mapping data positions for uncrackable privacy.
- Hide PINs and passwords
- Mnemonic card system
- Camouflaged data display
- Automatic iCloud sync
- Multiple data cards
- Uncrackable security
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Mnemonizer hides your PIN codes and passwords in a camouflaging environment, making them uncrackable for frauds and undetectable for spying eyes. ○○○ “Mnemonizer provides a novel security approach, enabling you to obscure your codes in plain text.” – TUAW ○○○ HOW IT WORKS The system generates a mnemonic card with a cell field. Each cell starts with a random editable value - number/letter/symbol and color. All you need to do is choose a place, where you’d like to hide your data and edit the corresponding cells. Place your data on the field in any convenient way (in a simple line, in a zigzag or even as a skip pattern). Then mentally mark its position, give a name to the card and your stored information is ready to use. On second opening, your brain instantly recognizes the position of the data, while everyone else sees a mess. In a variety of up to 9,223,372,036,854,775,807 (2^63) of possible arrangement combinations, guessing or cracking gets impossible. Thus, yours will stay only yours. FEATURES - your data stays safe at all times, even if someone sees your screen - hide passwords and PIN codes among random symbols on mnemonic cards - store all data on one card or create separate cards for different data - nothing to intercept or spy, thus nearly impossible to crack - automatic iCloud sync and backup ○○○ More from Happymagenta: · Spyglass - outdoor GPS with augmented reality · Scany - WiFi scanner and network utility
Columns.app
Organize your thoughts and tasks with a unique column-based list manager. Ideal for planning, tracking, and managing projects, ideas, or collections. It offers a structured, linear approach similar to mind maps for clear visualization.
- Organize with linear columns
- Plan and track progress
- Manage projects and ideas
- Create roadmaps
- Teamwork organization
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Columns is a list manager. Lists are great for organizing things and see the big picture. It's perfect for planning, tracking, noting, managing and thinking. It is like mind maps but organized in a linear, columns structure. What for? Make a list of movies you want to see. Put all your recipes together. Create a roadmap for your project. Organize teamwork. Lists help track progress. Write a novel. So it’s a tool for organizing lists, and lists are a tool for organizing things. If you need the ultimate organizer, you found it.
Screenshots
Verdict
The clearest difference is review sentiment: Mnemonizer at 83% against Columns.app's 50%. Mnemonizer also leads on rating (4.8 vs 4.3) and device support (4 vs 2). Columns.app's advantage is update cadence (every 3 weeks vs every 14 months). On price, ratings volume, 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.
Mnemonizer holds the better App Store score, 4.8 against 4.3. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews point the same way: 83% of Mnemonizer's written reviews are positive against 50% of Columns.app's.
Mnemonizer ships an update every 14 months, Columns.app every 3 weeks. The most recent releases landed on November 13, 2026 and November 3, 2026 respectively.
| Parameter | Mnemonizer | Columns.app |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (4 ratings) — better | 4.3 (3 ratings) |
| Positive reviews | 83.3% of reviews — better | 50.0% of reviews |
| Number of ratings | 4 — better | 3 |
| Update frequency | Every 14 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 8.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 18 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Happymagenta UAB | Columns, inc. |
Customer experience
Mnemonizer
Columns.app
In-app purchases
Mnemonizer
No in-app purchases
Columns.app
No in-app purchases









