# UTC Orbit vs JulianCal

The clearest difference is in-app purchases: UTC Orbit at none against JulianCal's 1. JulianCal's advantage is update cadence (every 5 days vs every 8 months) and iOS requirement (15.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. JulianCal sells 1 one-off in-app purchase. UTC Orbit asks for nothing beyond the download.

UTC Orbit ships an update every 8 months, JulianCal every 5 days. The most recent releases landed on November 2, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | UTC Orbit | JulianCal |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/utc-orbit/id1049069115/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 5 days** |
| Monetization | Free | — |
| Size | 2 MB | 38 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Dave Massey](https://appshunter.io/developer/1029584286) | [Matteo Masin](https://appshunter.io/developer/1869119076) |

## What reviewers say

### UTC Orbit

[App page](https://appshunter.io/ios/app/utc-orbit/id1049069115)

This utility converts between human-readable dates and a YYDDD.FFFFFF format essential for spacecraft orbital element calculations. It also features a UTC alarm clock based on the day of the year and a large digit UTC display.

**Highlights:** UTC time conversion, YYDDD.FFFFFF format display, UTC alarm clock, Day of Year alarm setting, Large digit UTC clock display, Background alarm notifications

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### JulianCal

[App page](https://appshunter.io/ios/app/juliancal/id6757821490)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| JulianCal Pro | $2.99 | one-time |


## Frequently asked questions

### Is UTC Orbit free?

UTC Orbit is free to download, with no in-app purchases.

### Is JulianCal free?

JulianCal is free to download, with in-app purchases available.

### Do UTC Orbit or JulianCal have ads?

Neither UTC Orbit nor JulianCal shows ads.

### Which is updated more often, UTC Orbit or JulianCal?

UTC Orbit ships an update every 8 months, and JulianCal every 5 days. Most recently, UTC Orbit was updated on November 2, 2026 and JulianCal on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*