Comparison

Krypton vs True Random Numbers

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

Head to head
About

Krypton

Securely encrypt and protect your personal documents and folders with strong encryption. This app acts like a digital vault, keeping your sensitive files safe from unauthorized access on your devices and cloud storage.

Highlights
  • Strong encryption for documents and folders
  • Acts as a secure digital vault
  • Supports various file types (pictures, movies, PDFs, etc.)
  • Cloud synchronization with iCloud Drive and Dropbox
  • Available on iOS and macOS
Features
Read full description

Protecting your personal and confidential information since 2009, Krypton is the first, simplest and most reliable App on the iOS Store to strongly encrypt entire documents and folders. Now also available on the macOS App Store. Your stuff is secure from prying eyes no matter where you are in the world. Metaphorically, Krypton keeps your encrypted items in a special vault, with each item contained in their own deposit box; to gain access to an encrypted item the vault must be open and the passcode key must be used to unlock the deposit box before you can discern the plaintext contents inside. In iOS the vault may be open or closed, while on macOS the vault opens upon Log In. Because the unit of encryption is an entire document or folder, Krypton is not a password manager in the traditional sense, although you can maintain a document of all your passwords that you encrypt between uses. Krypton can encrypt any type of document, including but not limited to: • Pictures and movies from your photo album. • Email messages from your mailbox. • Songs, PDFs, movies, Zip files, word processing documents, text files, images, program source code or any other object that you can download over the network or from your personal web server. • Anything on the iOS pasteboard. • Any document other Apps are willing to Share, such as Pages, Numbers and Keynote. • iCloud Drive and Dropbox files for easy cloud synchronization. Krypton uses strong encryption on each item. This has several ramifications: • If your passcode is strong enough to withstand a brute force attack, no one is going to see your stuff. • If you forget your passcode, no one can recover your stuff for you! But only that one document is lost, not your entire collection of items. • Your stuff is secure even if your iDevice or Mac is stolen, or iCloud Drive or Dropbox account is compromised. Visit http://www.bigcatos.com to learn more.

About

True Random Numbers

Features
Read full description

Most random number generators calculate the numbers with pseudo random number generators. But this app leverages your device's motion sensors, swipes, or camera input, to generate authentically random numbers and shuffles. It also doesn't have a modulo bias, a common problem with random number generators.

Screenshots

Krypton4 screens
True Random Numbers1 screens

Verdict

The call

The clearest difference is price: True Random Numbers at Free against Krypton's $2.99. True Random Numbers also leads on update cadence (every 2 days vs every 10 months). Krypton's advantage is in-app purchases (none vs 1) and ads (none vs shown).

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

True Random Numbers is free to download; Krypton costs $2.99 up front. True Random Numbers sells 1 one-off in-app purchase. Krypton asks for nothing beyond the download.

UpkeepUpdate frequency

Krypton ships an update every 10 months, True Random Numbers every 2 days. The most recent releases landed on September 22, 2026 and September 20, 2026 respectively.

Scorecard6 real differences · 3 level
Krypton versus True Random Numbers: the parameters behind the verdict, then further details
ParameterKryptonTrue Random Numbers
Price$2.99Free — better
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 10 monthsEvery 2 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaid—
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS14.0 — better17.6
Further details — not scored
Size110 MB5 MB
Age rating4+4+
DeveloperSteve LidieFrank Buss

In-app purchases

None

Krypton

No in-app purchases

1 purchases

True Random Numbers

One-time1
  • Remove Ads$1.99

Questions

Is Krypton free?
Krypton costs $2.99, with no in-app purchases.
Is True Random Numbers free?
True Random Numbers is free to download, with in-app purchases available.
Do Krypton or True Random Numbers have ads?
True Random Numbers shows ads; Krypton does not.
Which is updated more often, Krypton or True Random Numbers?
Krypton ships an update every 10 months, and True Random Numbers every 2 days. Most recently, Krypton was updated on September 22, 2026 and True Random Numbers on September 20, 2026.

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