Report updated May 19, 2026
Modulus Calculator
For general Android users requiring a multi-functional utility tool for daily mathematical, financial, and unit conversion tasks.
Modulus Calculator is an established utilities app that is completely free. With a 4.3/5 rating from 367.1K reviews, it shows polarized user reception. Users particularly appreciate the lightweight design and fast calculation speed provide a reliable experience for daily math tasks, though calculation errors and cursor jumping during long sequences frustrate users performing complex daily financial tallies remains a common concern.
What is Modulus Calculator?
Modulus Calculator is a multi-functional utility app for Android that bundles scientific, financial, and unit-conversion tools into a single interface.
Users hire this app to consolidate disparate daily calculation tasks into one lightweight tool, reducing the need for multiple specialized applications.
Current Momentum
v1.0 · 38mo ago
Zombie- Ships general bug fixes only.
- Maintains broad Android hardware support.
What makes this app unique?
What Does It Look Like?
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What Are The Key Features?
Bundles regular, scientific, mortgage, age, BMI, discount, and date calculators into a single interface.
Provides exchange rate conversions with daily updates.
Calculates goods and services tax specifically for the Indian market.
How much does it cost?
- Free, ad-supported
The app operates as a free, ad-supported utility with no IAP or subscription gates, prioritizing massive user acquisition across the Android ecosystem.
Who Built It?
Theodore Dubois
Providing specialized open-source utilities and developer tools for technical power users and academic niches.
Portfolio
3
Apps
What other apps does Theodore Dubois make?
Explore the full Theodore Dubois report
Portfolio breakdown, audience, momentum, and every app published by Theodore Dubois.
What do users think recently?
Low confidence · 53 reviews analyzed · Based on 53 reviews. Signal may be noisy.
How did the latest release land?
What is the recent mood?
Recent user voice shows a mixed sentiment. Users appreciate the lightweight design and fast calculation speed provide a reliable experience for daily math tasks, but report calculation errors and cursor jumping during long sequences frustrate users performing complex daily financial tallies.
What Users Love
What Frustrates Users
What Users Want
How have ratings & review volume moved?
Rating, review sentiment, and total reviews over time, with release markers showing the post-launch impact.
Vertical markers = app releases. Hover any release for the post-release impact delta.
View the full user-sentiment analysis
Mood gauge, ratings & review-volume history, every praise / complaint / request, and sentiment over time.
What is the competitive landscape for Modulus Calculator?
How's The Utilities Market?
Market outlook for this category
Available very soon
The rivals identified
Nemeses(1)
This app directly competes for the utility-focused user base by offering a comprehensive suite of scientific and high-precision tools that mirror the target's core functionality.
Contenders(4)
This app competes by offering specialized physics-based calculation engines that serve the professional engineering segment of the target's user base.
This app competes by specializing in niche geometric problem-solving, capturing a segment of the target's scientific calculator audience.
This app targets the same utility-seeking demographic by emphasizing high-precision display and standard memory functions.
Dash Calc competes by focusing on speed and real-time feedback, targeting users who prioritize efficiency over the target's multi-tool approach.
Same space(3)
This app competes by offering a professional-grade conversion experience with advanced input methods.
This app targets the professional engineering segment of the target's audience with specialized, high-precision conversion tools.
This app provides a similar all-in-one conversion experience, directly challenging the target's utility suite.
Compare Modulus Calculator against every rival
All rivals in one side-by-side table — identity, store metrics, ratings & sentiment, and strategic intel — plus a head-to-head page for each.
The outtake for Modulus Calculator
Strengths to defend, gaps to attack
Core Strengths
- Regional GST calculator functions as a B2B distribution moat in India
- Broad hardware optimization maximizes Android install base
Critical Frictions
- Cursor-stability bugs in long sequences erode trust
- Dark mode contrast issues force unnecessary app restarts
- 0.47★ Android-iOS rating gap
Growth Levers
- Untapped B2B partnerships in education
- Integration of advanced loan/EMI modules to satisfy high-intent financial users
Market Threats
- High-velocity release cadence of Calculator₊
- Native system-level integration of Apple's Calculator
- Technical regressions on flagship hardware
What are the next best moves?
Rebuild cursor logic because calculation errors are the top complaint → stabilize long-sequence financial tallies
Cursor jumping and calculation errors are the primary frustration theme in user reviews.
Trade-off: Push the loan/EMI module sprint to Q3 — stability is a prerequisite for financial utility.
Audit dark mode contrast because visibility issues force app restarts → improve session retention
Users report gray-on-dark text is unreadable, forcing them to minimize and reopen the app.
Trade-off: Same-quarter capacity available — no major lever displaced.
A counter-intuitive read
The app's maintenance-mode status is a strategic asset, as it avoids the feature bloat that plagues incumbents and keeps the interface lightweight for the core Android user base.
Feature Gaps vs Competitors
- Real-time market data feeds (available in Currency Converter Plus Live but absent here)
- Specialized amortization scheduling (available in Mortgage Calculator・ but absent here)
Key Takeaways
Modulus Calculator holds its category lead through sticky regional features like the GST calculator, but technical regressions erode trust, so revenue growth hinges on stabilizing the core arithmetic engine.
Where Is It Heading?
Mixed Signals
The utility market is consolidating around high-frequency update cycles, leaving apps in maintenance mode like Modulus Calculator exposed to specialized rivals. The subject app must pivot toward advanced financial modules to retain power users, or it will lose its chart position to entrants with better amortization visualization.
Technical regressions on flagship hardware (failing icons, load errors) erode trust among high-value users, which compounds the rating drag already visible on Android.
Regional localization (GST calculator) secures a defensible B2B distribution barrier in India, which protects the app from generic global utility competitors.