Spool Ethanol Analyzer vs e85Cal
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Spool Ethanol Analyzer
This application connects to a wireless sensor kit to measure in-tank ethanol content and fuel temperature. It also features a mixing ratio calculator that can be used independently of the sensor hardware.
- Connects to Spool Wireless Ethanol Sensor Kit
- Measures in-tank ethanol content
- Measures fuel temperature
- Includes mixing ratio calculator
- Uses Low energy Bluetooth protocols
- Fast and reliable data
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Spool Ethanol Analyzer is designed to connect to the Spool Wireless Ethanol Sensor Kit and/or the Spool Handheld ethanol analyzer to help determine the in-tank/pump ethanol content and fuel temperature. It incorporates the latest Low energy Bluetooth protocols and provides fast and reliable ethanol content information right on your smartphone. The App also includes a mixing ratio calculator and it can be used even if you don't have access to the Spool Wireless Ethanol Sensor Kit. The Spool Wireless Ethanol Sensor Kit can be purchased at www.spoolperformance.us
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 Spool Ethanol Analyzer's 40%. e85Cal also leads on rating (4.7 vs 4.1) and update cadence (every 4 months vs every 13 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 4.1. Both are backed by a comparable volume of ratings — 14 and 35 respectively. Written reviews point the same way: 40% of Spool Ethanol Analyzer's written reviews are positive against 83% of e85Cal's.
Spool Ethanol Analyzer ships an update every 13 months, e85Cal every 4 months. The most recent releases landed on June 9, 2026 and September 26, 2026 respectively.
| Parameter | Spool Ethanol Analyzer | e85Cal |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (14 ratings) | 4.7 (35 ratings) — better |
| Positive reviews | 40.0% of reviews | 83.3% of reviews — better |
| Number of ratings | 14 | 35 — better |
| Update frequency | Every 13 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 11.0 — better | 12.1 |
| Further details — not scored | ||
| Size | 9 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Ajay Rajeev | Michael Joe |
Customer experience
Spool Ethanol Analyzer
e85Cal
In-app purchases
Spool Ethanol Analyzer
No in-app purchases
e85Cal
No in-app purchases
