# One Question per Day vs Selen

The clearest difference is in-app purchases: One Question per Day at none against Selen's 2. One Question per Day also leads on update cadence (weekly vs every 3 weeks) and iOS requirement (13.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. Selen sells 2 in-app purchases, starting at $5.99 per month. One Question per Day asks for nothing beyond the download.

One Question per Day ships an update weekly, Selen every 3 weeks. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | One Question per Day | Selen |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Size | 60 MB | 52 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Skyhook Apps](https://appshunter.io/developer/1788272217) | [Mickael Cavelier](https://appshunter.io/developer/1875316224) |

## What reviewers say

### One Question per Day

[App page](https://appshunter.io/ios/app/one-question-per-day/id6754540840)

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

**In-app purchases:** none


### Selen

[App page](https://appshunter.io/ios/app/selen/id6758859179)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Selen premium monthly | $5.99 | per month |
| Selen infini premium yearly | $49.99 | per year |


## Frequently asked questions

### Is One Question per Day free?

One Question per Day is free to download, with no in-app purchases.

### Is Selen free?

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

### Do One Question per Day or Selen have ads?

Neither One Question per Day nor Selen shows ads.

### Which is updated more often, One Question per Day or Selen?

One Question per Day ships an update weekly, and Selen every 3 weeks. Most recently, One Question per Day was updated on October 30, 2026 and Selen on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*