Mnemonizer vs Image to PDF
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
Image to PDF
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Create, edit, and sign PDFs on the go. PDF Composer is your all-in-one PDF editor, scanner, and converter. Easily turn images, documents, or scans into PDFs, then edit, mark up, sign, and share them from your iPhone or iPad. Key Features: Convert & Create PDFs • Turn images, scans, and documents into PDF files • Combine multiple pages into a single PDF • Import from Files, Photos, or your camera Edit & Annotate • Draw, highlight, and add comments to any page • Edit, adjust, and apply filters • Use Apple Pencil for precision on iPad Sign Documents • Add digital signatures with your finger or stylus • Save your signature for quick reuse Scan to PDF • Use your camera to scan documents • Enhance with image filters Export & Share • Save to device or share via email, cloud, or messages • All files are stored locally for maximum privacy Download PDF Composer today and handle all your PDF tasks effortlessly, anywhere. Privacy Policy: https://pdfcomposerapp.github.io/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Mnemonizer at none against Image to PDF's 3. Mnemonizer also leads on device support (4 vs 2) and iOS requirement (8.0 vs 17.5). Image to PDF's advantage is update cadence (fortnightly vs every 14 months). On price and ads 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. Image to PDF sells 3 in-app purchases, starting at $2.99 per 7 days. Mnemonizer asks for nothing beyond the download.
Mnemonizer ships an update every 14 months, Image to PDF fortnightly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | Mnemonizer | Image to PDF |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (4 ratings) — better | — |
| Positive reviews | 83.3% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 14 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 8.0 — better | 17.5 |
| Further details — not scored | ||
| Size | 18 MB | 25 MB |
| Age rating | 4+ | 17+ |
| Developer | Happymagenta UAB | Kiryl Kaveryn |
In-app purchases
Mnemonizer
No in-app purchases
Image to PDF
- Unlimited access3 Days trial$2.997 Days
- Unlimited access$3.991 Month
- Unlimited access$17.991 Year









