# 一日一問 vs Main Arc

The clearest difference is in-app purchases: 一日一問 at none against Main Arc's 4. 一日一問 also leads on device support (3 vs 1) and iOS requirement (12.0 vs 17.0). Main Arc's advantage is ads (none vs shown) and update cadence (every 4 days vs every 12 months). On price there is nothing between them.

Both are free to download. Main Arc sells 4 in-app purchases, starting at $0.29 per month. 一日一問 asks for nothing beyond the download.

一日一問 ships an update every 12 months, Main Arc every 4 days. The most recent releases landed on October 27, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | 一日一問 | Main Arc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 12 months | **Every 4 days** |
| Size | 59 MB | 10 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Shunsuke Abe](https://appshunter.io/developer/1606720824) | [Denys Khomenko](https://appshunter.io/developer/6773156392) |

## What reviewers say

### 一日一問

[App page](https://appshunter.io/ios/app/id1606720822)

**Features:** macOS Compatibility

**In-app purchases:** none


### Main Arc

[App page](https://appshunter.io/ios/app/main-arc-winter-arc-tracker/id6806285592)

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Main Arc Pro Monthly | $0.29 | per month |
| HabitMint Pro Weekly | $3.99 | per 7 days |
| HabitMint Pro Yearly | $24.99 | per year |
| Main Arc Pro Lifetime | $1.99 | one-time |


## Frequently asked questions

### Is 一日一問 free?

一日一問 is free to download, with no in-app purchases.

### Is Main Arc free?

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

### Do 一日一問 or Main Arc have ads?

一日一問 shows ads; Main Arc does not.

### Which is updated more often, 一日一問 or Main Arc?

一日一問 ships an update every 12 months, and Main Arc every 4 days. Most recently, 一日一問 was updated on October 27, 2026 and Main Arc on October 29, 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.*