Comparison

Mnemonizer vs Catch

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

Head to head
About

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.

Highlights
  • Hide PINs and passwords
  • Mnemonic card system
  • Camouflaged data display
  • Automatic iCloud sync
  • Multiple data cards
  • Uncrackable security
Features
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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

About

Catch

Capture your thoughts quickly and easily with this journaling app designed for busy individuals. It offers multiple input methods and a unique linking feature to connect ideas, helping you record life's moments in small increments.

Highlights
  • Quick entry creation
  • Multiple media input methods (text, drawing, images)
  • Link entries together
  • Time-efficient journaling
  • User-friendly interface
Features
Read full description

Catch is a pocket notebook for the ideas you'd otherwise lose. Press one button and capture it — by text, voice, photo, or a quick drawing — before it's gone. Catch is perfect for academics capturing text and photos from new subjects they need to remember. For photographers connecting shots and notes on locations they've scouted. For podcasters grabbing ideas fifteen seconds at a time for the next show. For travelers eating and drinking their way through a holiday, always finding something new to tell people back home. CAPTURE In Catch, you don't start by creating a document, a title or even deciding where to sort something before you capture — you create cards that fit a single idea. Whether by writing it out, talking out loud, using your camera, or simply drawing an idea out with your finger, a simple idea is saved to a single card. LINK Like any PKM system, you can link ideas together, but Catch simplifies that all the way down. Instead of hashtags or folders, you just link a card to another. It doesn't matter if it's a photo of your amazing lunch in Rome or that fortune cookie you found on the way back after work that read, "Life brings you a bold and dashing adventure." These two are connected, and you don't have to explain why. Your brain will relive that connection. RIFF Catch doesn't just allow you to link cards but to instantly bounce off another card. When you capture something by bouncing off another, you can flip back and forth between your reference and the next one. When you submit, that new card will instantly be connected to the previous one. Some users create a title card, bookmark it, and then create off that original card. All their cards interconnect and stay on theme. Simple and powerful. CREATIVITY Catch is designed with constraints in mind to keep you creative and, more important, keep your ideas sharp and raw. Max 200 text characters per text card, 15 seconds of audio per audio card, or even just having to fit your content inside the shape of a small card forces you into the habit of being concise. Instead of trying to fit that large idea into a single card, spread it out over several cards and link them together. EXPORT You are fully in charge of your data. Nothing you create is trapped in Catch — your text, photos, audio, and drawings export to open files you can take anywhere, any time.

Screenshots

Mnemonizer4 screens
Catch4 screens

Verdict

The call

The clearest difference is update cadence: Catch at every 2 months against Mnemonizer's every 14 months. Catch also leads on rating (5.0 vs 4.8) and review sentiment (100% vs 83%). Mnemonizer's advantage is ratings volume (4 vs 1) and device support (4 vs 1). 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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

Catch holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 4 and 1 respectively. Written reviews point the same way: 83% of Mnemonizer's written reviews are positive against 100% of Catch's.

UpkeepUpdate frequency

Mnemonizer ships an update every 14 months, Catch every 2 months. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

Scorecard6 real differences · 4 level
Mnemonizer versus Catch: the parameters behind the verdict, then further details
ParameterMnemonizerCatch
PriceFreeFree
Rating4.8 (4 ratings)5.0 (1 ratings) — better
Positive reviews83.3% of reviews100.0% of reviews — better
Number of ratings4 — better1
Update frequencyEvery 14 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone
Requires iOS8.0 — better18.0
Further details — not scored
Size18 MB53 MB
Age rating4+4+
DeveloperHappymagenta UABFreddie Iboy

Customer experience

Mnemonizer

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews12 reviews
Positive83.3%
Neutral0.0%
Negative16.7%

Catch

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Mnemonizer

No in-app purchases

None

Catch

No in-app purchases

Questions

Is Mnemonizer free?
Mnemonizer is free to download, with no in-app purchases.
Is Catch free?
Catch is free to download, with no in-app purchases.
Which has better reviews, Mnemonizer or Catch?
Catch is rated higher. Mnemonizer averages 4.8 out of 5 from 4 ratings, while Catch averages 5.0 from 1 ratings.
Do Mnemonizer or Catch have ads?
Neither Mnemonizer nor Catch shows ads.
Which is updated more often, Mnemonizer or Catch?
Mnemonizer ships an update every 14 months, and Catch every 2 months. Most recently, Mnemonizer was updated on October 24, 2026 and Catch on October 7, 2026.

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