Leon vs ePerf
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Leon
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.
- Mobile crew information access
- Aircraft operations support
- Scheduling and rostering
- Airplane dispatch
- Online flight watch
- Centralized database access
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LEON is an application designed for crew members. It offers a mobile access to crew information entered by air operators into Leon system. Leon is a software for aviation supporting aircraft operations fearuring many various functions that allow to run different procedures smoothly. It includes aiding in scheduling, aircraft and crew rostering, airplane dispatch, on-line flight watch, aircraft charter sales and many more. it consists of central database accessible through Internet in relation to users' privileges. The new version of the LEON app has a new design and displays office duties that were missing in the previous version.
ePerf
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.
- 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
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Get performance calculations in any phase of flight, anytime, anywhere! For airlines that seek for an economical paperless cockpit solution the ePerf is a tablet application that reduces costs and workload, and improves the aircraft performance. Our ePerf is fully stand-alone, calculating takeoff and landing performance offline in any phase of flight, anytime and anywhere. Benefits: - Less paper! Reduces or replaces paper-based material, saving weight in the cockpit; - Improved performance compared to printed performance books; - Engines Savings due to Takeoff Thrust Optimization - Saves time: quick performance calculations and lower workload; - Clean interface: straight-forward for pilots; - Analysis run offline: no Internet connection needed; - Support for all Embraer Commercial aircraft models; - Easy to update. Requirements: - Airport database compatible with ECAFM or IATA SCAP ADIS v1.0 (Airport database updates either via iTunes or wirelessly) Data enclosed in the application is provided for demonstration purposes only and shall not be used for operational purposes. Please contact Embraer for further information (opereng@embraer.com.br).
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Leon | ePerf |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (8 ratings) — better | 3.0 (2 ratings) |
| Positive reviews | 9.1% of reviews | — |
| Number of ratings | 8 — better | 2 |
| Update frequency | Every 2 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad — better | iPad |
| Requires iOS | 16.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 36 MB | 53 MB |
| Age rating | 4+ | 4+ |
| Developer | Leon Software | EMBRAER S.A. |
Customer experience
Leon
ePerf
In-app purchases
Leon
No in-app purchases
ePerf
No in-app purchases








