# Deadliner待办日历 vs Vellum

The clearest difference is update cadence: Vellum at weekly against Deadliner待办日历's every 3 weeks. Vellum also leads on iOS requirement (18.6 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Deadliner待办日历 sells 1 one-off in-app purchase and Vellum sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Deadliner待办日历 ships an update every 3 weeks, Vellum weekly. Both last shipped on October 25, 2026.

## The numbers

| Metric | Deadliner待办日历 | Vellum |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Size | 57 MB | 44 MB |
| Requires iOS | 26.0 | **18.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [容皓 崔](https://appshunter.io/developer/1511704086) | [四扬 叶](https://appshunter.io/developer/6797699915) |

## What reviewers say

### Deadliner待办日历

[App page](https://appshunter.io/ios/app/deadliner/id6760482719)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Deadliner Geek 终身会员 | $2.99 | one-time |


### Vellum

[App page](https://appshunter.io/ios/app/vellum-topic-notes-and-ideas/id6799964763)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Vellum pro lifetime | $2.99 | one-time |


## Frequently asked questions

### Is Deadliner待办日历 free?

Deadliner待办日历 is free to download, with in-app purchases available.

### Is Vellum free?

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

### Do Deadliner待办日历 or Vellum have ads?

Neither Deadliner待办日历 nor Vellum shows ads.

### Which is updated more often, Deadliner待办日历 or Vellum?

Deadliner待办日历 ships an update every 3 weeks, and Vellum weekly. Most recently, Deadliner待办日历 was updated on October 25, 2026 and Vellum on October 25, 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.*