# こかげ vs Prometheus Ember

こかげ and Prometheus Ember are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. こかげ sells 4 one-off in-app purchases and Prometheus Ember sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

こかげ ships an update every 3 weeks, Prometheus Ember every 2 weeks. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | こかげ | Prometheus Ember |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Size | 158 MB | 9 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Orcalogy LLC](https://appshunter.io/developer/6792312335) | [Prometheus Academics LLC](https://appshunter.io/developer/6815355173) |

## What reviewers say

### こかげ

[App page](https://appshunter.io/ios/app/id6792312333)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 言の葉 - ミニ | $0.49 | one-time |
| 言の葉 - S | $2.99 | one-time |
| 言の葉 - 中 | $9.99 | one-time |
| 言の葉 - 大 | $29.99 | one-time |


### Prometheus Ember

[App page](https://appshunter.io/ios/app/prometheus-ember/id6815355170)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Prometheus Plus (Monthly) | $9.99 | per month |
| Prometheus Plus (Yearly) | $99.00 | per year |


## Frequently asked questions

### Is こかげ free?

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

### Is Prometheus Ember free?

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

### Do こかげ or Prometheus Ember have ads?

Neither こかげ nor Prometheus Ember shows ads.

### Which is updated more often, こかげ or Prometheus Ember?

こかげ ships an update every 3 weeks, and Prometheus Ember every 2 weeks. Most recently, こかげ was updated on October 24, 2026 and Prometheus Ember on October 26, 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.*