# FlowCalendar vs Sunadokei

The clearest difference is in-app purchases: FlowCalendar at none against Sunadokei's 1. FlowCalendar also leads on ads (none vs shown) and update cadence (every 2 days vs every 5 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Sunadokei sells 1 one-off in-app purchase. FlowCalendar asks for nothing beyond the download.

FlowCalendar ships an update every 2 days, Sunadokei every 5 weeks. The most recent releases landed on October 13, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | FlowCalendar | Sunadokei |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 days** | Every 5 weeks |
| Size | 15 MB | 12 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Masayuki Honda](https://appshunter.io/developer/1568838876) | [atsuko imai](https://appshunter.io/developer/1830783417) |

## What reviewers say

### FlowCalendar

[App page](https://appshunter.io/ios/app/flowcalendar/id6749845502)

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

**In-app purchases:** none


### Sunadokei

[App page](https://appshunter.io/ios/app/sunadokei-visual-sand-timer/id6762150420)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sunadokei Pro | $2.99 | one-time |


## Frequently asked questions

### Is FlowCalendar free?

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

### Is Sunadokei free?

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

### Do FlowCalendar or Sunadokei have ads?

Sunadokei shows ads; FlowCalendar does not.

### Which is updated more often, FlowCalendar or Sunadokei?

FlowCalendar ships an update every 2 days, and Sunadokei every 5 weeks. Most recently, FlowCalendar was updated on October 13, 2026 and Sunadokei on October 24, 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.*