# Twilight Time vs SI Converter

The clearest difference is update cadence: Twilight Time at every 2 weeks against SI Converter's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Twilight Time ships an update every 2 weeks, SI Converter every 2 months. The most recent releases landed on September 23, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | Twilight Time | SI Converter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Size | 36 MB | 4 MB |
| Requires iOS | **16.7.10** | 17.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [Ramon A. Marchante Castellanos](https://appshunter.io/developer/1735326162) |

## What reviewers say

### Twilight Time

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

**Features:** macOS Compatibility

**In-app purchases:** none


### SI Converter

[App page](https://appshunter.io/ios/app/si-converter/id6504356195)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Twilight Time free?

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

### Is SI Converter free?

SI Converter is free to download, with no in-app purchases.

### Do Twilight Time or SI Converter have ads?

Both Twilight Time and SI Converter show ads.

### Which is updated more often, Twilight Time or SI Converter?

Twilight Time ships an update every 2 weeks, and SI Converter every 2 months. Most recently, Twilight Time was updated on September 23, 2026 and SI Converter on May 16, 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.*