e85Cal vs Flash Tree
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.
Flash Tree
Synchronize countdown timers across multiple devices for group races or events. Start races instantly without needing external assistance. Ideal for competitive activities where precise timing is crucial.
- Synced countdown timers
- Group race functionality
- Start races instantly
- Multi-device synchronization
- Customizable countdowns
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Flash Tree is like having a synced countdown in your pocket. No more having to ask someone to start a race. Just select your preferred countdown, hit start, and GO! You can sync multiple devices to the same countdown for a group race. Flash Tree has 2 payment options Free: You can join any race invited by others for free Paid: The app asks for $1.99/month subscription to start race and invite others. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: e85Cal at 4.7 against Flash Tree's 4.0. e85Cal also leads on in-app purchases (none vs 1) and ratings volume (35 vs 4). Flash Tree's advantage is update cadence (every 10 days vs every 4 months) and review sentiment (100% vs 83%). On price, ads, device support and iOS requirement 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. Flash Tree sells 1 in-app purchase, starting at $9.99 per month. e85Cal asks for nothing beyond the download.
e85Cal holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: e85Cal has 35 ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 83% of e85Cal's written reviews are positive against 100% of Flash Tree's, so the app with the better star average is not the one people write more warmly about.
e85Cal ships an update every 4 months, Flash Tree every 10 days. Both last shipped on September 26, 2026.
| Parameter | e85Cal | Flash Tree |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (35 ratings) — better | 4.0 (4 ratings) |
| Positive reviews | 83.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 35 — better | 4 |
| Update frequency | Every 4 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.1 | 11.0 — better |
| Further details — not scored | ||
| Size | 15 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Michael Joe | BUILDMYPAGE, LLC |
Customer experience
e85Cal
Flash Tree
In-app purchases
e85Cal
No in-app purchases
Flash Tree
- Flash Tree Subscription$9.991 Month
