Onboard Performance Tool vs Acron ETHOS EU
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Onboard Performance Tool
This application enables flight crews and ground personnel to perform real-time performance calculations for flights. It provides fast and precise data for takeoff, landing, and weight and balance, accounting for various environmental and operational factors.
- Real-time performance calculations
- Takeoff analysis
- Landing analysis
- Weight and balance information
- Accounts for weather and runway conditions
- Corrects for pressure variation and MEL items
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*** This application requires configuration files, performance and other databases, available separately. Contact your Boeing representative for details. *** The Onboard Performance Tool (OPT) permits flight crews and ground personnel to perform real-time calculations based on current weather and runway conditions, while adhering to company and regulatory policies and procedures. The Onboard Performance Tool provides self-planning capability through fast and precise calculations. It allows flight crews to calculate the takeoff analysis, landing analysis, and weight and balance information. Instant and accurate calculations save time by correcting for pressure variation, runway conditions, engine bleeds and Minimum Equipment List (MEL) items.
Acron ETHOS EU
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The Acron ETHOS EU (European server) app provides a convenient platform that allows users to run courseware and other eLearning applications hosted on the Acron Learning Management System. It is designed for the aviation training industry. This app requires a user account given to end-users currently affiliated with an Acron ETHOS contract training partner. The Acron ETHOS EU app should be used by customers whose training accounts are based on our European server. Please contact your airline training department or flight school for confirmation and download instructions.
Verdict
The clearest difference is iOS requirement: Acron ETHOS EU at 15.6 against Onboard Performance Tool's 17.6. On price, update cadence, ads and in-app purchases 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.
Both ship on a similar rhythm, roughly every 6 months. The most recent releases landed on October 1, 2026 and September 18, 2026 respectively.
| Parameter | Onboard Performance Tool | Acron ETHOS EU |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (17 ratings) — better | — |
| Positive reviews | 13.5% of reviews | — |
| Number of ratings | 17 — better | — |
| Update frequency | Every 6 months | Every 6 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPad | iPad |
| Requires iOS | 17.6 | 15.6 — better |
| Further details — not scored | ||
| Size | 42 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | The Boeing Company | Aerosim |
In-app purchases
Onboard Performance Tool
No in-app purchases
Acron ETHOS EU
No in-app purchases
