Fuel Density Calculation vs 777Buddy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fuel Density Calculation
This utility app assists wide-body aircrews, specifically for Boeing and Airbus aircraft, in comparing uploaded fuel quantities with actual fuel on board. It incorporates density calculations for accurate fuel management.
- Fuel density calculations
- Compare uploaded vs. actual fuel
- Designed for Boeing and Airbus aircrews
- Accurate fuel on board (FOB) verification
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Fuel Density Calculation is a cockpit utility for comparing receipt-based fuel uplift calculations against indicated fuel on board. Enter landing fuel, fuel density or specific gravity, fuel receipt quantities, and indicated FOB. The app calculates uplift, landing fuel plus uplift, and the resulting difference in both percent and pounds. Supports gallons and liters, automatic decimal formatting, and specific gravity conversion for receipts that provide SG instead of fuel density. This app is a calculation aid and does not replace approved aircraft, company, or maintenance procedures.
777Buddy
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This is a combination of several small apps I have written over the years to help operate the B777 aircraft. The values used are specific to a particular fleet of 96 aircraft that resulted from a big merger in 2012, think DEN/IAH. It works on the iPad, but looks better on the iPhone.
Screenshots
Verdict
The clearest difference is price: 777Buddy at Free against Fuel Density Calculation's $2.99. 777Buddy also leads on iOS requirement (15.0 vs 17.0). On update cadence, ads, in-app purchases and device support 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
777Buddy is free to download; Fuel Density Calculation costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Fuel Density Calculation ships an update every 2 months, 777Buddy every 6 weeks. The most recent releases landed on August 22, 2026 and September 17, 2026 respectively.
| Parameter | Fuel Density Calculation | 777Buddy |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 2 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Richard Montoya | Robert Steeneck |
In-app purchases
Fuel Density Calculation
No in-app purchases
777Buddy
No in-app purchases
Questions
Is Fuel Density Calculation free?
Is 777Buddy free?
Do Fuel Density Calculation or 777Buddy have ads?
Which is updated more often, Fuel Density Calculation or 777Buddy?
Other comparisons
