Rainfall Calculator is a productivity tool for iOS that estimates rainwater harvesting potential and annual cost savings based on roof catchment area.
The App DNA
What makes this app unique?
Users hire this tool to evaluate the ROI of installing rainwater storage systems without the privacy trade-offs of ad-supported utilities.
For Homeowners and gardeners interested in sustainable water management and evaluating the cost-effectiveness of rainwater collection systems.
What does it look like?
Key features
Calculates annual water volume based on roof area and rainfall depth.
Estimates annual monetary savings by inputting local municipal water costs.
How much does it cost?
The app utilizes a single-purchase model at $2.99, positioning itself as an ad-free, privacy-focused utility.
Velocity
Maintenance developmentperformanceopaqueShow more...
The app has shipped only one release in the last six months, averaging approximately 0.04 releases per week. This cadence indicates a maintenance-focused development cycle with no evidence of new feature development or live operations. The latest release provided only generic stability improvements and device compatibility updates. Development activity has remained stagnant since February 2026.
Who built it?
Nitrio
13+ apps tracked · Productivity
DC Power Cable Size Calc
Mass Molarity Calculator
Molecular Weight Calculator
Simple Harmonic Motion Calc
MemoPop +
Voltage Divider Calc
Hydraulic Pressure Calculator
Air Density Calculator
Impulse and Momentum Calc
Wallpaper Collection Supercars Edition
Wallpapers Collection Anime Edition
Wallpapers Collection Beautiful Girls EditionUser 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 Rainfall Calculator
How's the Productivity market?
Rainfall Calculator maintains a stable, niche presence in the productivity category with a 5-star rating. Its $2.99 price point serves as a barrier to entry compared to free, ad-supported alternatives.
Read the market outlookThe rivals identified
Unlock the deeper market read.
Access the full report for freeThe Analyst's Read
Key takeaways for Rainfall Calculator
Where is it heading?
The utility market is consolidating around automated, data-connected tools, leaving static calculators like this one in a niche position. Future viability depends on shifting from a manual calculator to a data-integrated service to prevent churn to free, modern alternatives.
- The app remains in maintenance mode with no new features, which limits growth but preserves the current user base.
The SWOT
- One-time purchase model ($2.99) removes recurring subscription friction
- Integration with local weather APIs could automate rainfall data entry
Next best moves
Integrate local weather API because manual entry is a friction point → increase daily utility
The counter-intuitive read
Users report: The app's lack of updates is a feature, not a bug…
Read the full takeSince the last report: The analysis shifted from recommending static content updates to proposing functional API integrations to address manual input friction.
Bottom line
Rainfall Calculator provides a functional, privacy-first tool for basic water harvesting estimates, but its lack of active development risks obsolescence against automated, data-connected alternatives, so the PM should prioritize a low-effort API integration to maintain relevance.
Unlock 1 critical friction, 1 market threat and the analyst’s take.
Access the full report for freeSources
- [1] App Store, source
Report last updated