# Quantin vs DayInBook

The clearest difference is in-app purchases: Quantin at none against DayInBook's 4. Quantin also leads on device support (3 vs 1) and iOS requirement (10.3 vs 17.0). DayInBook's advantage is update cadence (every 3 days vs every 3 months). On price and ads there is nothing between them.

Both are free to download. DayInBook sells 4 in-app purchases, starting at $1.99 per month. Quantin asks for nothing beyond the download.

Quantin ships an update every 3 months, DayInBook every 3 days. Both last shipped on October 4, 2026.

## The numbers

| Metric | Quantin | DayInBook |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 days** |
| Size | 25 MB | 15 MB |
| Requires iOS | **10.3** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [LADONNEE Consulting SARL](https://appshunter.io/developer/1588731787) | [阳 曹](https://appshunter.io/developer/1599300891) |

## What reviewers say

### Quantin

[App page](https://appshunter.io/ios/app/quantin/id1588731485)

**Features:** macOS Compatibility

**In-app purchases:** none


### DayInBook

[App page](https://appshunter.io/ios/app/dayinbook-fire/id6756570968)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO月订阅 | $1.99 | per month |
| PRO年订阅 | $9.99 | per year |
| AI积分100 | $1.99 | one-time |
| AI积分1000 | $17.99 | one-time |


## Frequently asked questions

### Is Quantin free?

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

### Is DayInBook free?

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

### Do Quantin or DayInBook have ads?

Neither Quantin nor DayInBook shows ads.

### Which is updated more often, Quantin or DayInBook?

Quantin ships an update every 3 months, and DayInBook every 3 days. Most recently, Quantin was updated on October 4, 2026 and DayInBook on October 4, 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.*