CAISI vs Julian
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CAISI
This mobile guide provides essential technical and functional information for users of Army automated sustainment systems. It ensures users have the necessary data to effectively interface with communications systems, optimizing sustainment functions.
- Optimize communications system interface
- Access technical information
- Access functional information
- Ensure sustainment function continuity
- Information for automated sustainment systems
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This mobile guide is designed as a tool for the users of the Army sustainment systems to use in order to optimize their interface with the communications system. Without the ability to communicate sustainment functions, even the fastest computer system becomes little more than a paperweight. Therefore the point of this app is to ensure that all Army automated sustainment information systems users have the information (e.g. technical and functional) they need.
Julian
This app provides a quick and efficient way to view and convert between 11 different types of dates, including standard Julian dates, Mars Sol dates, and Unix time. It features a calendar for easy navigation and allows copying dates to the clipboard. The current date can be displayed on the app icon and Apple Watch complications.
- 11 date type conversions
- Calendar view
- Copy to clipboard
- App icon badge display
- Apple Watch complications
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Julian makes it simple to find any day of the year, convert dates, and understand your year at a glance on iPhone, iPad, and Apple Watch. Browse the calendar to explore past and future dates, or enter a day number to jump straight to the matching date. Choose the date format you prefer and instantly see the day of the year, year progress, days remaining, week number, and current quarter. Convert between calendar dates, ordinal dates, ISO 8601 dates, ISO week dates, Julian calendar dates, Julian Day Numbers, and Unix timestamps. Add or subtract days, weeks, months, or years, or calculate the exact time between two dates. Julian supports a wide range of astronomical and time counting systems, including CCSDS Julian Date, CNES Julian Date, Dublin Julian Date, Lilian Date, Mars Sol Date, Modified Julian Date, Rata Die, Reduced Julian Date, Truncated Julian Date, and Unix Time. Copy any date value with a tap, or copy and share a complete date summary. Save your favorite formats for fast access whenever you need them. Keep important date information visible with Home Screen and Lock Screen widgets. Customize their layout, colors, and content. Larger widgets can show additional date values and calendar views without opening the app. On Apple Watch, quickly view yesterday, today, and tomorrow, look up any day of the year, and choose complications that match your watch face. Use Siri to retrieve date values and check your year progress. Add Julian actions to Shortcuts to convert dates, perform calculations, copy results, and open detailed date information. Personalize Julian with seven color themes, alternate app icons, and System, Light, or Dark appearance. Set your preferred first day of the week and choose which month begins your first quarter. For an instant glance, enable the optional app icon badge to show the current day of the year. Badge updates are silent and do not create banners or sounds. Notification permission is required. Use the International Fixed Calendar, with 13 months of 28 days, across Julian, widgets, and Apple Watch. Share a personalized image of today's date and year progress.
Screenshots
Verdict
The clearest difference is review sentiment: Julian at 67% against CAISI's 0%. Julian also leads on rating (4.8 vs 4.1) and update cadence (every 2 months vs every 26 months). CAISI's advantage is in-app purchases (none vs 3) and iOS requirement (8.4 vs 17.0). On price, ads and device support 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. Julian sells 3 one-off in-app purchases. CAISI asks for nothing beyond the download.
Julian holds the better App Store score, 4.8 against 4.1. That said, the two scores are not equally well evidenced: Julian has 4.7K ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 0% of CAISI's written reviews are positive against 67% of Julian's.
CAISI ships an update every 26 months, Julian every 2 months. The most recent releases landed on October 6, 2026 and October 21, 2026 respectively.
| Parameter | CAISI | Julian |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (7 ratings) | 4.8 (4.7K ratings) — better |
| Positive reviews | 0.0% of reviews | 66.7% of reviews — better |
| Number of ratings | 7 | 4.7K — better |
| Update frequency | Every 26 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 8.4 — better | 17.0 |
| Further details — not scored | ||
| Size | 30 MB | 19 MB |
| Age rating | 9+ | 4+ |
| Developer | TRADOC Mobile | Juan Carlos Perez |
Customer experience
CAISI
Julian
Bugs and requests
CAISI
Not enough reviews yet to summarise bugs or requests.
Julian
Reported bugs
3 issues- Complication not updating correctly on Apple Watch
- Date displayed incorrectly, one day behind
- App not functioning properly after updates
Requested features
4 requests- Display current date along with Julian date
- Add countdown/days remaining functionality
- Display week number
- Show Julian date on app icon
In-app purchases
CAISI
No in-app purchases
Julian
- Short Cup$0.99
- Tall Cup$1.99
- Grande Cup$2.99








