# /cards vs AI钥匙串

/cards and AI钥匙串 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. /cards sells 4 in-app purchases, starting at $2.99 per month and AI钥匙串 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

/cards ships an update every 3 weeks, AI钥匙串 monthly. The most recent releases landed on September 23, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | /cards | AI钥匙串 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Size | 5 MB | 4 MB |
| Requires iOS | 18.0 | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Parra LLC](https://appshunter.io/developer/1865552317) | [欣悦 王](https://appshunter.io/developer/1880251143) |

## What reviewers say

### /cards

[App page](https://appshunter.io/ios/app/cards-claude-code-flashcards/id6770581039)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $2.99 | per month |
| Pro Annual | $7.99 | per year |
| Pro Annual | $19.99 | per year |
| Pro lifetime | $14.99 | one-time |


### AI钥匙串

[App page](https://appshunter.io/ios/app/ai/id6778318694)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Key Cards | $0.99 | one-time |


## Frequently asked questions

### Is /cards free?

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

### Is AI钥匙串 free?

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

### Do /cards or AI钥匙串 have ads?

Neither /cards nor AI钥匙串 shows ads.

### Which is updated more often, /cards or AI钥匙串?

/cards ships an update every 3 weeks, and AI钥匙串 monthly. Most recently, /cards was updated on September 23, 2026 and AI钥匙串 on September 18, 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.*