# Leon vs ePerf

The clearest difference is rating: Leon at 4.3 against ePerf's 3.0. Leon also leads on update cadence (every 2 weeks vs every 2 months) and ratings volume (8 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Leon holds the better App Store score, 4.3 against 3.0. Both are backed by a comparable volume of ratings — 8 and 2 respectively.

Leon ships an update every 2 weeks, ePerf every 2 months. The most recent releases landed on September 15, 2026 and July 17, 2026 respectively.

## The numbers

| Metric | Leon | ePerf |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (8 ratings)](https://appshunter.io/ios/app/leon/id443136426/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/eperf/id586166665/reviews) |
| Number of ratings | **8** | 2 |
| Positive reviews | 9.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 36 MB | 53 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | **iPhone, iPad** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Leon Software](https://appshunter.io/developer/443136429) | [EMBRAER S.A.](https://appshunter.io/developer/507436833) |

## What reviewers say

### Leon

[App page](https://appshunter.io/ios/app/leon/id443136426)

This application provides aviation crew members with mobile access to crew information managed by air operators. It supports aircraft operations with features for scheduling, rostering, dispatch, and flight watch, all accessible through a central online database.

**Highlights:** Mobile crew information access, Aircraft operations support, Scheduling and rostering, Airplane dispatch, Online flight watch, Centralized database access

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

**In-app purchases:** none


### ePerf

[App page](https://appshunter.io/ios/app/eperf/id586166665)

This application provides pilots with real-time aircraft performance calculations for any flight phase, offline. It aims to reduce cockpit workload, save fuel through takeoff thrust optimization, and eliminate paper-based materials for a more economical and efficient flight operation.

**Highlights:** Offline flight performance calculations, Takeoff and landing performance, Reduced paper cockpit materials, Engine savings through thrust optimization, Quick performance calculations, Support for Embraer Commercial aircraft

**In-app purchases:** none


## Frequently asked questions

### Is Leon free?

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

### Is ePerf free?

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

### Which has better reviews, Leon or ePerf?

Leon is rated higher. Leon averages 4.3 out of 5 from 8 ratings, while ePerf averages 3.0 from 2 ratings.

### Do Leon or ePerf have ads?

Neither Leon nor ePerf shows ads.

### Which is updated more often, Leon or ePerf?

Leon ships an update every 2 weeks, and ePerf every 2 months. Most recently, Leon was updated on September 15, 2026 and ePerf on July 17, 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.*