# Qualife vs DuoSub

The clearest difference is iOS requirement: Qualife at 15.5 against DuoSub's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Qualife sells 1 one-off in-app purchase and DuoSub sells 3 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

Qualife ships an update every 6 weeks, DuoSub monthly. The most recent releases landed on October 25, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Qualife | DuoSub |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 6 weeks | **Monthly** |
| Size | 160 MB | 12 MB |
| Requires iOS | **15.5** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Trung Nguyen](https://appshunter.io/developer/1144335586) | [Vui Nguyen](https://appshunter.io/developer/1697789456) |

## What reviewers say

### Qualife

[App page](https://appshunter.io/ios/app/qualife/id6783875360)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 4,950 Credits | $0.99 | one-time |


### DuoSub

[App page](https://appshunter.io/ios/app/duosub-subtitle-translator/id6799621505)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DuoSub Pro - 1 Month | $6.99 | per month |
| DuoSub Pro - 3 Months | $14.99 | per 3 months |
| DuoSub Pro - 1 Year | $49.99 | per year |


## Frequently asked questions

### Is Qualife free?

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

### Is DuoSub free?

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

### Do Qualife or DuoSub have ads?

Both Qualife and DuoSub show ads.

### Which is updated more often, Qualife or DuoSub?

Qualife ships an update every 6 weeks, and DuoSub monthly. Most recently, Qualife was updated on October 25, 2026 and DuoSub on November 6, 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.*