# Sharp Eye vs Duko

The clearest difference is update cadence: Duko at every 4 days against Sharp Eye's monthly. Sharp Eye's advantage is iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Sharp Eye sells 3 in-app purchases, starting at $0.99 per month and Duko sells 7 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Sharp Eye ships an update monthly, Duko every 4 days. Both last shipped on October 28, 2026.

## The numbers

| Metric | Sharp Eye | Duko |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Monthly | **Every 4 days** |
| Size | 28 MB | 100 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ivan Gastilovic](https://appshunter.io/developer/1599069138) | [Shawn Wilson](https://appshunter.io/developer/1896760419) |

## What reviewers say

### Sharp Eye

[App page](https://appshunter.io/ios/app/sharp-eye/id6748249331)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month No Ads Subscription | $0.99 | per month |
| 6 Months No Ads Subscription | $4.99 | per 6 months |
| 1 Year No Ads Subscription | $8.99 | per year |


### Duko

[App page](https://appshunter.io/ios/app/duko-sudoku-reimagined/id6770674054)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10 Hints | $0.99 | one-time |
| Video Game Pack | $0.99 | one-time |
| Explorer Pack | $0.99 | one-time |
| Halloween Pack | $0.99 | one-time |
| Fun & Games Pack | $0.99 | one-time |
| Mythology Pack | $0.99 | one-time |
| Remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is Sharp Eye free?

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

### Is Duko free?

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

### Do Sharp Eye or Duko have ads?

Both Sharp Eye and Duko show ads.

### Which is updated more often, Sharp Eye or Duko?

Sharp Eye ships an update monthly, and Duko every 4 days. Most recently, Sharp Eye was updated on October 28, 2026 and Duko on October 28, 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.*