This utility app converts between Julian and Gregorian dates and tracks Julian Day Numbers. It's designed for users in fields like astronomy, military operations, and historical research who need precise date management for daily operations.






250+ iOS apps curated and reviewed
Out of 250+ 365 days calendar apps on iOS, 17 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 | $1.99 | 4.7★ (27) | No | No | Oct 2026 | ||
| 2 | Free | 2.9★ (51) | No | Yes | Oct 2026 | ||
| 3 | Free | — | No | Yes | Oct 2026 | ||
| 4 | Free | 4.0★ (1) | No | No | Oct 2026 | ||
| 5 | $4.99 | 1.0★ (1) | No | No | Oct 2026 | ||
| 6 | Free | 3.0★ (2) | No | No | Oct 2026 | ||
| 7 | Free | 2.0★ (3) | No | Yes | May 2026 | ||
| 8 | Free | — | No | No | Oct 2026 |






This utility app converts between Julian and Gregorian dates and tracks Julian Day Numbers. It's designed for users in fields like astronomy, military operations, and historical research who need precise date management for daily operations.

This app offers a comprehensive calendar experience with lunar views, contact birthday reminders, and yearly overviews. Users can personalize the background and view the clock directly within the app. It also provides iPad support.





