# Know AI vs DuoMentor

The clearest difference is ads: Know AI at none against DuoMentor's shown. Know AI also leads on update cadence (weekly vs fortnightly). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Know AI sells 2 in-app purchases, starting at $9.99 per month and DuoMentor sells 10 in-app purchases, starting at $3.49 per month. Whichever you choose, the download price is not the number that matters.

Know AI ships an update weekly, DuoMentor fortnightly. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Know AI | DuoMentor |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Fortnightly |
| Size | 32 MB | 105 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DEVNEST (PTY) LTD](https://appshunter.io/developer/1803135127) | [ERTUGRUL YILMAZ](https://appshunter.io/developer/1888585657) |

## What reviewers say

### Know AI

[App page](https://appshunter.io/ios/app/know-ai-homework-solver/id6746722205)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $9.99 | per month |
| Yearly Subscription | $69.99 | per year |


### DuoMentor

[App page](https://appshunter.io/ios/app/duomentor-video-homework-help/id6761280193)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Question Pack Monthly | $3.49 | per month |
| Pro 3 Months | $27.99 | per 3 months |
| Teacher Pro 3 Months | $27.99 | per 3 months |
| Question Pack Yearly | $31.99 | per year |
| Pro 6 Months | $53.99 | per 6 months |
| Teacher Pro 6 Months | $53.99 | per 6 months |
| 100 Video Credits | $2.99 | one-time |
| 250 Video Credits | $6.99 | one-time |
| 600 Video Credits | $15.99 | one-time |
| 1000 Video Credits | $24.99 | one-time |


## Frequently asked questions

### Is Know AI free?

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

### Is DuoMentor free?

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

### Do Know AI or DuoMentor have ads?

DuoMentor shows ads; Know AI does not.

### Which is updated more often, Know AI or DuoMentor?

Know AI ships an update weekly, and DuoMentor fortnightly. Most recently, Know AI was updated on November 8, 2026 and DuoMentor on November 5, 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.*