# Duos vs Performance Engineer Trainer

The clearest difference is in-app purchases: Performance Engineer Trainer at none against Duos's 5. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Duos sells 5 in-app purchases, starting at $9.99 per 7 days. Performance Engineer Trainer asks for nothing beyond the download.

Duos ships an update every 8 days, Performance Engineer Trainer every 4 days. The most recent releases landed on October 2, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Duos | Performance Engineer Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/duos-ai-job-interview-prep/id6443408884/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 days | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 143 MB | 4 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Marina Gladysheva](https://appshunter.io/developer/1645287289) | [Kirill Kalistratov](https://appshunter.io/developer/1888794382) |

## What reviewers say

### Duos

[App page](https://appshunter.io/ios/app/duos-ai-job-interview-prep/id6443408884)

Practice job interviews with an AI coach that provides personalized feedback and realistic scenarios. Build confidence and refine your skills through interactive mock interviews and debrief sessions. Learn and grow in a game-like environment designed for effective career preparation.

**Highlights:** AI interviewers with unique personalities, Tailored technical and soft skill practice, Real-time, constructive feedback, Progress tracking and performance metrics, Game-like learning environment, Personalized preparation journey

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 week Pro | $9.99 | per 7 days |
| 1 month Pro | $19.99 | per month |
| 3 month Pro | $41.99 | per 3 months |
| Unlock Interview Analysis | $1.99 | one-time |
| premium | $9.99 | one-time |


### Performance Engineer Trainer

[App page](https://appshunter.io/ios/app/performance-engineer-trainer/id6761308281)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Duos free?

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

### Is Performance Engineer Trainer free?

Performance Engineer Trainer is free to download, with no in-app purchases.

### Do Duos or Performance Engineer Trainer have ads?

Neither Duos nor Performance Engineer Trainer shows ads.

### Which is updated more often, Duos or Performance Engineer Trainer?

Duos ships an update every 8 days, and Performance Engineer Trainer every 4 days. Most recently, Duos was updated on October 2, 2026 and Performance Engineer Trainer on September 29, 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.*