# DayInBook vs VulpFlow

The clearest difference is update cadence: DayInBook at every 3 days against VulpFlow's every 4 months. VulpFlow's advantage is iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. DayInBook sells 4 in-app purchases, starting at $1.99 per month and VulpFlow sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

DayInBook ships an update every 3 days, VulpFlow every 4 months. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | DayInBook | VulpFlow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 4 months |
| Size | 15 MB | 58 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [阳 曹](https://appshunter.io/developer/1599300891) | [Yufan Shi](https://appshunter.io/developer/1888358413) |

## What reviewers say

### 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 |


### VulpFlow

[App page](https://appshunter.io/ios/app/vulpflow-cash-flow-planner/id6761236176)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VulpFlow Pro Plan - Monthly | $4.99 | per month |
| Lifetime Access | $29.99 | one-time |


## Frequently asked questions

### Is DayInBook free?

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

### Is VulpFlow free?

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

### Do DayInBook or VulpFlow have ads?

Neither DayInBook nor VulpFlow shows ads.

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

DayInBook ships an update every 3 days, and VulpFlow every 4 months. Most recently, DayInBook was updated on October 30, 2026 and VulpFlow on October 31, 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.*