# KET PET AAA vs LightLing

The clearest difference is price: LightLing at Free against KET PET AAA's $9.99. LightLing also leads on update cadence (every 4 days vs every 13 months). KET PET AAA's advantage is in-app purchases (none vs 3) and iOS requirement (13.2 vs 15.6). On ads and device support there is nothing between them.

LightLing is free to download; KET PET AAA costs $9.99 up front. LightLing sells 3 in-app purchases, starting at $2.99 per month. KET PET AAA asks for nothing beyond the download.

KET PET AAA ships an update every 13 months, LightLing every 4 days. The most recent releases landed on September 24, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | KET PET AAA | LightLing |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 4 days** |
| Size | 25 MB | 95 MB |
| Requires iOS | **13.2** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [贞平 阮](https://appshunter.io/developer/1369966007) | [PXBT](https://appshunter.io/developer/1803806340) |

## What reviewers say

### KET PET AAA

[App page](https://appshunter.io/ios/app/ket-pet-aaa/id1503472643)

**In-app purchases:** none


### LightLing

[App page](https://appshunter.io/ios/app/lightling-language-learning/id6758724787)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Thunderbolt Monthly | $2.99 | per month |
| Thunderbolt Year | $12.99 | per year |
| Thunderbolt Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is KET PET AAA free?

KET PET AAA costs $9.99, with no in-app purchases.

### Is LightLing free?

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

### Do KET PET AAA or LightLing have ads?

Neither KET PET AAA nor LightLing shows ads.

### Which is updated more often, KET PET AAA or LightLing?

KET PET AAA ships an update every 13 months, and LightLing every 4 days. Most recently, KET PET AAA was updated on September 24, 2026 and LightLing 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.*