Report updated May 20, 2026
FOE Calculator
For forge of Empires players requiring game-specific calculations and general users needing a multi-purpose utility calculator.
FOE Calculator is an established games app that is free with in-app purchases. With a 4.3/5 rating from 367.1K reviews, it shows polarized user reception. Users particularly appreciate the lightweight design provides a fast and efficient calculation experience for daily tasks, though cursor jumping and number duplication during long addition sequences disrupt the calculation flow remains a common concern.
What is FOE Calculator?
FOE Calculator is a multi-purpose utility app for Android and iOS that combines a Forge of Empires game calculator with standard scientific, financial, and unit conversion tools.
Users hire this app to consolidate daily calculation needs and game-specific math into one offline-capable tool, reducing the need for multiple specialized applications.
Current Momentum
v1.5 · 14mo ago
Maintenance- Ships minor improvements on iOS.
- Maintains long-term Android utility base.
Active Nemesis
Mathway: Math Problem Solver
By Chegg
Other Rivals
7-Day Rank Pulse 🇺🇸
GamesNo ranking data
Rating Pulse 🇺🇸
Recent User Mood
What makes this app unique?
What Does It Look Like?
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What Are The Key Features?
Calculates contribution and secures spots for buildings in Forge of Empires with custom arc bonus settings
Provides trigonometric functions and logarithms for complex mathematical operations
Converts currencies with daily updated rates and various physical units
Computes exact installment amounts for loans and mortgages
Allows usage of calculation tools without an active internet connection
How much does it cost?
- Free (Android)
- $0.99 (iOS)
Monetization is split by platform, using a one-time purchase on iOS and ad-supported free access on Android.
Who Built It?
Christoph Amerstorfer
Providing utility-focused tools for mobile users, ranging from complex mathematical calculations to image management workflows.
Portfolio
2
Apps
What other apps does Christoph Amerstorfer make?
Explore the full Christoph Amerstorfer report
Portfolio breakdown, audience, momentum, and every app published by Christoph Amerstorfer.
What do users think recently?
High confidence · 50 reviews analyzed · Based on 50 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 provides a fast and efficient calculation experience for daily tasks, but report cursor jumping and number duplication during long addition sequences disrupt the calculation flow and dark mode display issues render calculated results invisible against the background.
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 FOE Calculator?
How's The Games Market?
How does it evolve in the Games market?
The app maintains a high-volume install base on Android (367k+ ratings) but lacks the update cadence of academic-focused rivals like Mathway. The $0.99 iOS price point creates a monetization ceiling that limits growth compared to ad-heavy Android utility competitors.
Rank progression
2 active rankings tracked — 30-day window
The rivals identified
Nemeses(1)
This app directly competes by targeting the tablet-specific utility market, offering a robust suite of scientific and visual tools that overlap with the FOE Calculator's all-in-one value proposition.
Contenders(4)
Targets the professional and engineering segment by offering advanced workspace management features that exceed standard calculator capabilities.
Competes as a lightweight alternative for users who prefer a stripped-down, minimalist interface over the FOE Calculator's feature-heavy design.
This app competes by emphasizing speed and real-time results, directly challenging the FOE Calculator's utility-first approach.
A direct contender that focuses on high-precision display and multitasking, appealing to the same productivity-minded user base.
Same space(3)
Competes by providing a robust, professional-grade conversion toolset that mirrors the FOE Calculator's utility scope.
Directly overlaps with the FOE Calculator's conversion tools but specializes in technical and engineering-grade precision.
Competes by offering a similar 'all-in-one' utility experience, specifically targeting the productivity category.
Compare FOE 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 FOE Calculator
Strengths to defend, gaps to attack
Core Strengths
- Offline-first architecture ensures consistent tool reliability
- Niche game-specific calculator provides direct paid-conversion lever
Critical Frictions
- Persistent input bugs during addition sequences
- Flagship hardware incompatibility on recent Android builds
- Lack of dark-mode contrast for calculated results
Growth Levers
- Memory functions for complex accounting tasks
- Regional currency support for underserved denominations
- Wearable integration for quick-access utility
Market Threats
- Mathway update cadence outpaces current development
- Flagship hardware incompatibility risks losing high-value users
- Specialized financial apps siphoning vertical traffic
What are the next best moves?
Rebuild input logic for addition sequences because user complaints cite cursor jumping → restore calculation trust
Input bugs are the #1 complaint theme in sentiment analysis.
Trade-off: Push the wearable companion app sprint to Q3 — wearable demand is lower than core input stability needs.
Audit dark mode CSS for contrast because results are invisible against backgrounds → reduce churn
Dark mode display issues are a persistent friction point in user reviews.
Trade-off: Same-quarter capacity available — no major lever displaced.
A counter-intuitive read
The app's maintenance-mode status is its primary risk; a single live-ops rival with a 2-week update cadence will erode the user base faster than any feature gap.
Feature Gaps vs Competitors
- Step-by-step algebraic solving (available in Mathway)
- AI-powered equation scanning (available in Calculator Air)
- Customizable calculator layouts (available in CalcKit)
Key Takeaways
FOE Calculator holds its niche through game-specific utility but bleeds users to specialized rivals due to input bugs, so the PM must prioritize core calculation stability to protect the Android base.
Where Is It Heading?
Mixed Signals
The utility calculator market is consolidating around specialized academic and AI-driven solvers, leaving generalist tools like FOE Calculator vulnerable to churn. The PM must transition from maintenance-mode to a stability-first update cycle to prevent further erosion of the Android user base.
Persistent input bugs during addition sequences erode user trust, which compounds the rating drag already visible on flagship Android hardware.
Recent updates focused on minor improvements, indicating a maintenance-mode posture that leaves the app exposed to faster-moving competitors.