# key_card vs Duo.Link

key_card and Duo.Link are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

key_card ships an update fortnightly, Duo.Link every 10 days. The most recent releases landed on October 4, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | key_card | Duo.Link |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 10 days** |
| Size | 36 MB | 42 MB |
| Requires iOS | 13.0 | 13 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Manish Pipaliya](https://appshunter.io/developer/1715792055) | [Ali Javaid](https://appshunter.io/developer/1750635616) |

## What reviewers say

### key_card

[App page](https://appshunter.io/ios/app/key-card/id6471648440)

**Features:** macOS Compatibility

**In-app purchases:** none


### Duo.Link

[App page](https://appshunter.io/ios/app/duolink/id6504041613)

**In-app purchases:** none


## Frequently asked questions

### Is key_card free?

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

### Is Duo.Link free?

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

### Do key_card or Duo.Link have ads?

Neither key_card nor Duo.Link shows ads.

### Which is updated more often, key_card or Duo.Link?

key_card ships an update fortnightly, and Duo.Link every 10 days. Most recently, key_card was updated on October 4, 2026 and Duo.Link on October 1, 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.*