e85Cal vs BuildSpec
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
BuildSpec
Easily track, organize, and showcase your car modification projects. Log parts, costs, and installation details for multiple vehicles in a structured, searchable garage. Designed for car builders and modifiers to maintain a complete build history.
- Track modifications and parts
- Log costs and installation details
- Maintain build history
- Create multiple vehicle profiles
- Store specifications and photos
- Organized garage dashboard
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BuildSpec is the ultimate app for tracking, organizing, and showcasing your car builds. Whether you're modifying a daily driver, building a track car, or restoring a classic, BuildSpec keeps everything in one place. KEY FEATURES Track Modifications • Log parts, upgrades, and changes • Record costs and installation details • Maintain a complete build history Vehicle Profiles • Create builds for multiple vehicles • Store specifications and photos • Track mileage and vehicle details Organized Garage • Manage all builds from one dashboard • Quickly access vehicle information • Keep everything structured and searchable Designed for Enthusiasts • Clean, fast, and distraction-free interface • Built specifically for car builders and modifiers BuildSpec makes it easy to track your progress and showcase your builds.
Screenshots
Verdict
The clearest difference is rating: BuildSpec at 5.0 against e85Cal's 4.7. BuildSpec also leads on review sentiment (100% vs 83%). e85Cal's advantage is ratings volume (37 vs 1) and iOS requirement (12.1 vs 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.
BuildSpec holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: e85Cal has 37 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 83% of e85Cal's written reviews are positive against 100% of BuildSpec's.
e85Cal ships an update every 4 months, BuildSpec every 3 months. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.
| Parameter | e85Cal | BuildSpec |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (37 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 83.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 37 — better | 1 |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 12.1 — better | 17.6 |
| Further details — not scored | ||
| Size | 15 MB | 11 MB |
| Age rating | 4+ | 9+ |
| Developer | Michael Joe | Grant Johnson |
Customer experience
e85Cal
BuildSpec
In-app purchases
e85Cal
No in-app purchases
BuildSpec
No in-app purchases
