PROFLEX Connect vs e85Cal
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PROFLEX Connect
This app allows you to monitor your vehicle's fuel system performance in real-time. It displays device settings and helps locate nearby E85 fuel stations for convenient ethanol blending.
- Real-time device setting display
- E85 station locator
- Fuel ratio monitoring
- Performance flex fuel system integration
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PROFLEX Commander is a bolt on performance flex fuel system allowing your vehicle to make big power with ethanol right out of the box. No tuning needed. The PROFLEX Commander and FLEXLINK family of devices allow you to run any blend of gas and E85 at anytime, while always delivering the exact fuel ratio to your vehicle. The PROFLEX Connect app allows you to view your device settings in real-time, and even help you find a nearby e85 station.
e85Cal
This app assists users in calculating the precise amounts of standard and ethanol gasoline needed to achieve a desired ethanol percentage in their fuel mix. It simplifies the process by taking into account tank size, current fuel level, and the ethanol content of available fuel types.
- Calculate ethanol percentage goal
- Enter gas tank size
- Input standard pump gas ethanol %
- Input ethanol pump gas ethanol %
- Set target ethanol % mix
- Enter current fuel level %
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e85Cal help you calculate your ethanol percentage goal. It fast, simple, and easy to use. Just enter the following information: 1) How big is your gas tank? 2) What is the ethanol % in the standard pump gas? 3) What is the ethanol % in the ethanol pump gas? 4) What is your target ethanol % mix goal? 5) What is your current ethanol % min in your vehicle? 6) What is your current fuel level % in your vehicle? Results will display how many gallons or liters of standard and ethanol gas to pump in your vehicle based on your input.
Screenshots
Verdict
The clearest difference is review sentiment: e85Cal at 83% against PROFLEX Connect's 39%. e85Cal also leads on rating (4.7 vs 2.8). PROFLEX Connect's advantage is update cadence (weekly vs every 4 months). On price, ratings volume, 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.
e85Cal holds the better App Store score, 4.7 against 2.8. Both are backed by a comparable volume of ratings — 54 and 35 respectively. Written reviews point the same way: 39% of PROFLEX Connect's written reviews are positive against 83% of e85Cal's.
PROFLEX Connect ships an update weekly, e85Cal every 4 months. The most recent releases landed on October 8, 2026 and September 26, 2026 respectively.
| Parameter | PROFLEX Connect | e85Cal |
|---|---|---|
| Price | Free | Free |
| Rating | 2.8 (54 ratings) | 4.7 (35 ratings) — better |
| Positive reviews | 39.3% of reviews | 83.3% of reviews — better |
| Number of ratings | 54 — better | 35 |
| Update frequency | Weekly — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.4 | 12.1 — better |
| Further details — not scored | ||
| Size | 22 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | ADVANCED FUEL DYNAMICS | Michael Joe |
Customer experience
PROFLEX Connect
e85Cal
In-app purchases
PROFLEX Connect
No in-app purchases
e85Cal
No in-app purchases
