UniE85 Manager vs JB4 PRO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
UniE85 Manager
Monitor your vehicle's ethanol content wirelessly via Bluetooth. Calculate fuel blends for optimal performance and integrate data over your car's CAN-BUS with compatible hardware. Requires specific modules and software for full functionality.
- Wireless ethanol content viewing
- CAN-BUS integration
- E85 Mix Calculator
- Bluetooth connectivity
- Fuel blend calculations
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Unitronic's E85 Manager allows you to wirelessly view your current ethanol content, and integrate ethanol content over your vehicle's CAN-BUS when combined together with Unitronic's UniFLEX module, an Ethanol Content Sensor, and ECU Performance Software calibrated to add Flex Fuel functionality, while using your mobile device's Bluetooth connection. The included E85 Mix Calculator allows you to calculate current and future gas/ethanol content blends to ensure you can achieve your target ethanol content using your fuel tank size, current fuel level, current ethanol content, target ethanol content, and more! NOTE: This app requires a custom Bluetooth module (Unitronic UniFLEX) to allow for wireless ethanol content viewing. This app requires customized ECU Performance Software calibrated to add Flex Fuel functionality over your vehicle's CAN-BUS.
JB4 PRO
Integrate your performance tuner with your smartphone to adjust engine maps, view real-time data, and manage system settings. This app requires a specific Bluetooth adapter for full functionality.
- Change maps
- Monitor live engine data
- Record logs
- Manage fault codes
- Update JB4 firmware
- Smartphone integration
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Smart phone integration for your JB4 performance tuner to change maps, monitor live engine data, record logs, manage fault codes, update JB4 firmware, and much more! All JB4 systems sold from 2025+ use this new FREE app!
Screenshots
Verdict
The clearest difference is review sentiment: UniE85 Manager at 100% against JB4 PRO's 50%. UniE85 Manager also leads on rating (4.8 vs 4.4) and iOS requirement (13.0 vs 16.0). JB4 PRO's advantage is update cadence (every 2 weeks vs every 2 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.
UniE85 Manager holds the better App Store score, 4.8 against 4.4. Both are backed by a comparable volume of ratings — 40 and 14 respectively. Written reviews point the same way: 100% of UniE85 Manager's written reviews are positive against 50% of JB4 PRO's.
UniE85 Manager ships an update every 2 months, JB4 PRO every 2 weeks. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.
| Parameter | UniE85 Manager | JB4 PRO |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (40 ratings) — better | 4.4 (14 ratings) |
| Positive reviews | 100.0% of reviews — better | 50.0% of reviews |
| Number of ratings | 40 — better | 14 |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 23 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Corporation Unitronic Inc | Burger Motorsports, Inc |
Customer experience
UniE85 Manager
JB4 PRO
In-app purchases
UniE85 Manager
No in-app purchases
JB4 PRO
No in-app purchases
