# VIKI KNOWS vs Todo Flow

The clearest difference is update cadence: Todo Flow at every 3 weeks against VIKI KNOWS's every 2 months. VIKI KNOWS's advantage is iOS requirement (11.3 vs 16). On price, ads, 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.

VIKI KNOWS ships an update every 2 months, Todo Flow every 3 weeks. Both last shipped on October 15, 2026.

## The numbers

| Metric | VIKI KNOWS | Todo Flow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 113 MB | 40 MB |
| Requires iOS | **11.3** | 16 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [VIKIKNOWS](https://appshunter.io/developer/1146360176) | [Chengdu Dance Elephant Technology Co., LTD.](https://appshunter.io/developer/1741861571) |

## What reviewers say

### VIKI KNOWS

[App page](https://appshunter.io/ios/app/viki-knows/id1152283111)

**Features:** macOS Compatibility

**In-app purchases:** none


### Todo Flow

[App page](https://appshunter.io/ios/app/todo-flow-task-reminder/id6670187897)

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

**In-app purchases:** none


## Frequently asked questions

### Is VIKI KNOWS free?

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

### Is Todo Flow free?

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

### Do VIKI KNOWS or Todo Flow have ads?

Neither VIKI KNOWS nor Todo Flow shows ads.

### Which is updated more often, VIKI KNOWS or Todo Flow?

VIKI KNOWS ships an update every 2 months, and Todo Flow every 3 weeks. Most recently, VIKI KNOWS was updated on October 15, 2026 and Todo Flow on October 15, 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.*