# Astrodate vs Twilight Time

The clearest difference is price: Twilight Time at Free against Astrodate's $0.99. Twilight Time also leads on update cadence (every 2 weeks vs every 12 months) and iOS requirement (16.7.10 vs 18.0). Astrodate's advantage is ads (none vs shown). On in-app purchases and device support there is nothing between them.

Twilight Time is free to download; Astrodate costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Astrodate ships an update every 12 months, Twilight Time every 2 weeks. The most recent releases landed on October 31, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Astrodate | Twilight Time |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/astrodate/id308461774/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 12 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 1 MB | 36 MB |
| Requires iOS | 18.0 | **16.7.10** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Flying Titans, Inc.](https://appshunter.io/developer/308461777) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### Astrodate

[App page](https://appshunter.io/ios/app/astrodate/id308461774)

This app provides the current date and time in multiple specialized formats, including Julian Date, Modified Julian Date, and Truncated Julian Date. It also offers standard Gregorian ISO 8601 formats, eliminating the need for manual calculations. Ideal for astronomers and those requiring precise timekeeping across various systems.

**Highlights:** Julian Date conversion, Modified Julian Date, Truncated Julian Date, Dublin Julian Date, Gregorian ISO 8601 format, Astronomical date calculations

**Features:** macOS Compatibility

**In-app purchases:** none


### Twilight Time

[App page](https://appshunter.io/ios/app/twilight-time/id6503278537)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Astrodate free?

Astrodate costs $0.99, with no in-app purchases.

### Is Twilight Time free?

Twilight Time is free to download, with no in-app purchases.

### Do Astrodate or Twilight Time have ads?

Twilight Time shows ads; Astrodate does not.

### Which is updated more often, Astrodate or Twilight Time?

Astrodate ships an update every 12 months, and Twilight Time every 2 weeks. Most recently, Astrodate was updated on October 31, 2026 and Twilight Time 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.*