Fuel vs CalFi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fuel
Monitor your vehicle's ethanol concentration and fuel temperature in real-time. This app wirelessly connects to a compatible Bluetooth module, freeing up your device's port for simultaneous charging and monitoring. It includes an ethanol fill-up concentration calculator and customizable display views.
- Real-time ethanol concentration monitoring
- Real-time fuel temperature monitoring
- Wireless Bluetooth connectivity
- Ethanol fill-up concentration calculator
- Fahrenheit or Celsius display options
- Two display views
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***Note that this app requires a custom Bluetooth module to function. Info on the module can be found here: https://fuel-it.com/products/fuel-it-bluetooth-flex-fuel-analyzer The Fuel-It ECA gives you realtime feedback from your Continental Ethanol sensor. Wireless communication frees up your device's port so you can monitor and charge at the same time. Features: Ethanol concentration monitoring Fuel temperature monitoring 2 Display Views Fuel temperature display in Fahrenheit or Celsius Ethanol fill-up concentration calculator
CalFi
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CalFi is most advanced financial calculator to help in understanding financial needs and plan expenses and investments in better way.
Screenshots
Verdict
The clearest difference is update cadence: CalFi at every 5 days against Fuel's every 10 months. CalFi also leads on iOS requirement (11.0 vs 13.4). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Fuel ships an update every 10 months, CalFi every 5 days. The most recent releases landed on October 22, 2026 and October 8, 2026 respectively.
| Parameter | Fuel | CalFi |
|---|---|---|
| Price | Free | Free |
| Rating | 3.1 (33 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 33 — better | — |
| Update frequency | Every 10 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.4 | 11.0 — better |
| Further details — not scored | ||
| Size | 20 MB | 30 MB |
| Age rating | 4+ | 17+ |
| Developer | Dmac Mobile Developments, LLC | Vishwanath Reddy |
In-app purchases
Fuel
No in-app purchases
CalFi
No in-app purchases
