Krypton vs ZuluTime+GPS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
ZuluTime+GPS
This app provides pilots and others with instant, at-a-glance access to accurate Zulu (UTC) and local time, along with live GPS coordinates including latitude, longitude, altitude, and accuracy. It features a high-contrast dark interface, customizable units, and options to keep the screen on or toggle GPS to save battery.
- Large, easy-to-read time display (Zulu/UTC and local)
- Live GPS coordinates (latitude, longitude, altitude, accuracy)
- CAP grid reference calculation
- Customizable units (meters/feet)
- Continuous clock display option
- Battery-saving GPS toggle
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ZuluTime GPS is the essential cockpit companion for pilots and anyone else who needs accurate time and position data at a glance. Time at a Glance Instantly see both Zulu (UTC) and local time displayed in large, easy-to-read monospaced digits. Never fumble with time zone math during preflight or mission briefings again. Live GPS Coordinates Track your real-time position with latitude, longitude, altitude, and accuracy — all displayed clearly on screen. Altitude and accuracy display in your choice of meters or feet. CAP Grid Reference Automatically calculates your CAP grid reference from your current GPS position. Built for the Field Keep the screen on so it acts as a continuous clock display Toggle GPS tracking on or off to save battery Choose meters or feet for altitude and accuracy Clean, high-contrast dark interface readable in any lighting Zulu Time provides time and location reference information only and is not intended for navigation, aviation, maritime, or safety-critical use.
Screenshots
Verdict
The clearest difference is price: ZuluTime+GPS at Free against Krypton's $2.99. ZuluTime+GPS also leads on update cadence (every 3 weeks vs every 10 months). Krypton's advantage is device support (4 vs 1) and iOS requirement (14.0 vs 17.0). On rating, 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
ZuluTime+GPS is free to download; Krypton costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Krypton against 5.0 for ZuluTime+GPS. Both are backed by a comparable volume of ratings — 2 and 3 respectively.
Krypton ships an update every 10 months, ZuluTime+GPS every 3 weeks. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.
| Parameter | Krypton | ZuluTime+GPS |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 5.0 (2 ratings) | 5.0 (3 ratings) |
| Number of ratings | 2 | 3 — better |
| Update frequency | Every 10 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone |
| Requires iOS | 14.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 110 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Steve Lidie | Addison English |
Customer experience
Krypton
ZuluTime+GPS
In-app purchases
Krypton
No in-app purchases
ZuluTime+GPS
No in-app purchases









