# LexFlow vs KnowUp

The clearest difference is update cadence: KnowUp at every 2 days against LexFlow's every 4 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. LexFlow sells 2 in-app purchases, starting at $3.99 per month and KnowUp sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

LexFlow ships an update every 4 days, KnowUp every 2 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | LexFlow | KnowUp |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | **Every 2 days** |
| Size | 46 MB | 89 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [kanta mori](https://appshunter.io/developer/1604311224) | [Wenfeng Duan](https://appshunter.io/developer/1454244715) |

## What reviewers say

### LexFlow

[App page](https://appshunter.io/ios/app/lexflow-ai/id6759219724)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LexFlow Pro (Monthly) | $3.99 | per month |
| LexFlow Pro (Annual) | $22.99 | per year |


### KnowUp

[App page](https://appshunter.io/ios/app/knowup-ai-flashcards-and-study/id6779905080)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| knowup monthly | $2.99 | per month |
| knowup annual | $24.99 | per year |


## Frequently asked questions

### Is LexFlow free?

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

### Is KnowUp free?

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

### Do LexFlow or KnowUp have ads?

Neither LexFlow nor KnowUp shows ads.

### Which is updated more often, LexFlow or KnowUp?

LexFlow ships an update every 4 days, and KnowUp every 2 days. Most recently, LexFlow was updated on October 31, 2026 and KnowUp 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.*