# こいびと日記 vs Question Diary 365

こいびと日記 and Question Diary 365 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. こいびと日記 sells 2 in-app purchases, starting at $1.99 per 7 days and Question Diary 365 sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

こいびと日記 ships an update fortnightly, Question Diary 365 every 3 weeks. Both last shipped on November 5, 2026.

## The numbers

| Metric | こいびと日記 | Question Diary 365 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Size | 25 MB | 126 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Starcrown Inc](https://appshunter.io/developer/1082624152) | [Masami Mitsuta](https://appshunter.io/developer/1803880391) |

## What reviewers say

### こいびと日記

[App page](https://appshunter.io/ios/app/365/id6764788921)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro | $1.99 | per 7 days |
| Yearly Pro | $29.99 | per year |


### Question Diary 365

[App page](https://appshunter.io/ios/app/question-diary-365/id6777899186)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |
| Yearly | $49.99 | per year |


## Frequently asked questions

### Is こいびと日記 free?

こいびと日記 is free to download, with in-app purchases available.

### Is Question Diary 365 free?

Question Diary 365 is free to download, with in-app purchases available.

### Do こいびと日記 or Question Diary 365 have ads?

Neither こいびと日記 nor Question Diary 365 shows ads.

### Which is updated more often, こいびと日記 or Question Diary 365?

こいびと日記 ships an update fortnightly, and Question Diary 365 every 3 weeks. Most recently, こいびと日記 was updated on November 5, 2026 and Question Diary 365 on November 5, 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.*