# When2Do vs Big Number Calendar

The clearest difference is ads: When2Do at none against Big Number Calendar's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

When2Do ships an update every 10 days, Big Number Calendar every 9 days. The most recent releases landed on October 24, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | When2Do | Big Number Calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/when2do/id1672746901/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 10 days | **Every 9 days** |
| Monetization | Free | — |
| Size | 2 MB | 58 MB |
| Requires iOS | 16.1 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Danilo Bottini](https://appshunter.io/developer/304768858) | [daehyun sung](https://appshunter.io/developer/6785252586) |

## What reviewers say

### When2Do

[App page](https://appshunter.io/ios/app/when2do/id1672746901)

This app helps you plan your activities by scheduling them based on duration, deadline, and your work schedule. It tracks task progress and can export data to CSV. View your overall schedule in a GANTT style.

**Highlights:** Automated activity scheduling, Task duration and deadline input, Work schedule and holiday consideration, Task execution status tracking, CSV data export, GANTT style schedule view

**Features:** macOS Compatibility

**In-app purchases:** none


### Big Number Calendar

[App page](https://appshunter.io/ios/app/big-number-calendar/id6785252584)

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

**In-app purchases:** none


## Frequently asked questions

### Is When2Do free?

When2Do is free to download, with no in-app purchases.

### Is Big Number Calendar free?

Big Number Calendar is free to download, with no in-app purchases.

### Do When2Do or Big Number Calendar have ads?

Big Number Calendar shows ads; When2Do does not.

### Which is updated more often, When2Do or Big Number Calendar?

When2Do ships an update every 10 days, and Big Number Calendar every 9 days. Most recently, When2Do was updated on October 24, 2026 and Big Number Calendar on October 8, 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.*