Comparison

Leon vs ePerf

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Mobile crew information access
  • Aircraft operations support
  • Scheduling and rostering
  • Airplane dispatch
  • Online flight watch
  • Centralized database access
Features
Read full description

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.

About

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.

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
Read full description

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

Leon4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
Leon versus ePerf: the parameters behind the verdict, then further details
ParameterLeonePerf
PriceFreeFree
Rating4.3 (8 ratings) — better3.0 (2 ratings)
Positive reviews9.1% of reviews—
Number of ratings8 — better2
Update frequencyEvery 2 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad — betteriPad
Requires iOS16.015.0 — better
Further details — not scored
Size36 MB53 MB
Age rating4+4+
DeveloperLeon SoftwareEMBRAER S.A.

Customer experience

Leon

All ratings8 ratings
Positive75.0%
Neutral12.5%
Negative12.5%
Written reviews11 reviews
Positive9.1%
Neutral9.1%
Negative81.8%

ePerf

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

Leon

No in-app purchases

None

ePerf

No in-app purchases

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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