Spool Ethanol Analyzer is a utility for automotive enthusiasts that displays real-time ethanol content and fuel temperature from Spool Performance hardware on iOS.
The App DNA
What makes this app unique?
The app removes the friction of manual fuel testing by providing instant, wireless data readouts for performance tuners who need precise ethanol mixture calculations.
For Automotive enthusiasts and performance tuners who use Spool Performance hardware to monitor ethanol fuel content.
What does it look like?
Key features
Displays real-time ethanol content and fuel temperature via Bluetooth connection to Spool sensor kits.
Calculates fuel mixing ratios for ethanol blends with customizable tank size settings.
Integrates with Spool handheld ethanol analyzer hardware for mobile data readout.
How much does it cost?
The app functions as a free utility to support the sale of proprietary physical hardware kits sold via the developer's website.
Velocity
Dormant developmentnew contentUX improvementsShow more...
Spool Ethanol Analyzer has been inactive for 2,141 days, placing it firmly in the zombie category. The development momentum has ceased entirely, with no feature updates, bug fixes, or maintenance patches shipped in over five years. The last release focused on hardware integration and UI adjustments for then-current devices, but the lack of activity since indicates the project is no longer being actively supported.
Who built it?
User Sentiment
What do users think recently?
How are ratings & reviews evolving?
Not enough recent reviews to extract reliable themes yet.
Read the full review analysisCompetition
Competitive landscape for Spool Ethanol Analyzer
How's the Utilities market?
Spool Ethanol Analyzer functions as a hardware-tethered utility within the Automotive Utilities space. The absence of updates for over 2,100 days indicates a maintenance-only lifecycle, prioritizing hardware sales over software-driven market share growth.
Read the market outlookThe rivals identified
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Access the full report for freeThe Analyst's Read
Key takeaways for Spool Ethanol Analyzer
Where is it heading?
The market for performance-tuning utilities is shifting toward cross-platform, hardware-agnostic solutions that offer more frequent feature updates. Spool Ethanol Analyzer remains stable but exposed, as its long-term viability depends entirely on the continued relevance of the associated Spool Performance hardware.
- The 2,142-day update gap indicates a complete halt in feature development, which will eventually lead to compatibility failures on newer iOS versions.
- The app maintains a stable, niche role as a hardware support tool, which does not require active development to satisfy its core user base.
The SWOT
- Proprietary hardware integration creates high switching costs
- Cloud-based fuel logging could unlock recurring revenue
Next best moves
Audit OS compatibility because the 5-year update gap risks app-store delisting → maintain current user access
The counter-intuitive read
The app's lack of updates is a feature, not a bug…
Read the full takeSince the last report: The app's functional state remains unchanged, but the analytical framework has shifted to emphasize the technical risks of its five-year development hiatus. The assessment now prioritizes the threat of obsolescence over the previous focus on hardware-driven retention.
Bottom line
Spool Ethanol Analyzer serves as a functional tether for hardware sales, but its five-year development silence risks obsolescence as mobile OS standards shift. Maintaining basic compatibility is the only necessary move to protect the existing hardware-user experience.
Unlock 1 critical friction, 1 market threat and the analyst’s take.
Access the full report for freeFAQ
Is Spool Ethanol Analyzer compatible with non-Spool sensors?
Does the app require a subscription to use the mixing calculator?
Why has the app not been updated in several years?
Sources
- [1] App Store, source
Report last updated