NPKalc is a fertilizer calculation utility for iOS and Android designed for gardeners, farmers, and landscape professionals.
The App DNA
What makes this app unique?
Users hire this app to solve complex chemical ratio arithmetic, replacing manual conversion tables with a digital input interface.
For DIY lawn enthusiasts, gardeners, landscape professionals, golf course superintendents, and farmers requiring precise fertilizer application rates.
What does it look like?
Key features
Calculates required fertilizer amounts based on user-provided input for granular and liquid types
Allows input of fertilizer quantities using various units of measure
Provides specific calculation tools tailored for landscape professionals, golf course superintendents, and farmers
How much does it cost?
The app is currently distributed as a free utility with no observable monetization gates or subscription tiers.
Velocity
Dormant developmentopaqueShow more...
The app has been inactive for over two years, with no updates recorded since the release of version 0.0.4 in September 2021. The development momentum is classified as zombie due to the lack of any activity for well over the 12-month threshold. There is no evidence of ongoing maintenance, feature development, or live operations.
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 NPKalc - Fertilizer Calculator
How's the Utilities market?
NPKalc maintains a 4.53 rating on iOS with 15 reviews, positioning it as a niche utility tool. The lack of Android updates since 2021 suggests a primary focus on the Apple ecosystem.
Read the market outlookThe rivals identified
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Access the full report for freeThe Analyst's Read
Key takeaways for NPKalc - Fertilizer Calculator
Where is it heading?
The agricultural utility market is shifting toward integrated smart-home ecosystems that combine calculation with hardware control. NPKalc remains a static tool, which will likely lead to a gradual decline in relevance as users migrate to platforms that offer automated growth metrics.
- The lack of Android updates since 2021 indicates a maintenance-mode posture that leaves the app vulnerable to competitors with active release cadences.
- The current free-only model provides no revenue to fund future development, limiting the ability to build the retention features required for market growth.
The SWOT
- Professional-grade calculation logic tailored for specific agricultural segments
- Integration with smart irrigation hardware to capture the broader DIY garden management market
Next best moves
Ship maintenance reminders because the current static calculator lacks a retention loop → increase daily active usage.
The counter-intuitive read
The app's greatest risk is not a competitor's feature set…
Read the full takeFeature gaps
Maintenance reminders (available in Fish Tank Buddy but missing here) +2
Since the last report: The analysis shifted from a tactical focus on fixing a broken launch flow to a strategic assessment of the app's long-term retention and relevance in an AI-automated market.
Bottom line
NPKalc provides precise utility for agricultural professionals but lacks the recurring engagement loops necessary for long-term retention, so the PM should prioritize adding maintenance reminders to compete with broader garden management tools.
Unlock 2 critical frictions, 1 market threat and the analyst’s take.
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