| Core Identity |
| Developer | Prometheus Interactive LLC | Mustafa Tolga DALBUDAK | Adysseus | Rome Rock LLC | Oyku Gul Imran | Webtoweb | Cider Software LLC | Wuhan Ananta Technology Co., Ltd. | H Valeur | Webtoweb |
| Category | Utilities | Utilities | Productivity | Utilities | Productivity | Tools | Utilities | Utilities | Utilities | Tools |
| Platform | iOS, Android | iOS, Android | iOS, Android | Android, iOS | iOS, Android | Android | iOS | iOS, Android | iOS, Android | Android, iOS |
| Store Metrics |
| Rating | 4.6 / 5 | 0.0 / 5 | 4.8 / 5 | 4.7 / 5 | 0.0 / 5 | 4.5 / 5 | 4.8 / 5 | 4.7 / 5 | 4.3 / 5 | 1.8 / 5 |
| Ratings Count | 1,142 | 0 | 1,215 | 967 | 0 | 2,687 | 2,033 | 15,204 | 3 | 5 |
| Price | Free | Free | Free | Free | Free | Free | $9.99 | Free | $0.99 | $3.99 |
| Release Date | Feb 24, 2012 | Nov 5, 2022 | Jul 4, 2016 | Mar 6, 2018 | Jul 12, 2024 | Dec 6, 2018 | Dec 26, 2013 | Dec 24, 2019 | May 31, 2021 | Feb 6, 2024 |
| Last Updated | Apr 9, 2025 | Feb 18, 2023 | Aug 2, 2024 | Oct 31, 2023 | Jul 12, 2024 | Jan 7, 2026 | Mar 22, 2026 | Apr 15, 2026 | Sep 2, 2025 | Jun 11, 2024 |
| Sentiment & Reviews |
| Sentiment | - | positive | positive | positive | excellent | positive | positive | positive | - | positive |
| Score | - | 85/100 | 82/100 | 75/100 | 92/100 | 85/100 | 85/100 | 85/100 | - | 85/100 |
| Praises | - | - | - Minimalist interface design provides a fast and distraction-free experience for daily unit conversions
| - High accuracy and simple interface design make daily unit conversions fast and reliable for users
| - Extensive unit library and customization options provide utility for professional engineering and academic tasks
- Clean interface design avoids intrusive advertisements and unnecessary bloatware found in competing conversion tools
| - Simplicity and speed of conversion
| - Calculation history tape provides reliable verification for long strings of business numbers
| - Aesthetic variety and cute interface design
| - | - Specialized geometry focus
|
| Complaints | - | - | - Inability to manually reorder unit categories prevents users from prioritizing their most frequent conversions
| - Complex navigation through long lists makes finding specific conversion categories difficult for casual users
| - Inconsistent currency conversion availability creates confusion regarding the removal of specific national currencies
| - Lack of offline functionality
| - Widget functionality fails to trigger correctly on iPadOS and iOS devices
| - Ad frequency in the free version
| - | |
| Requests | - | - | - Manual reordering of unit categories would allow users to prioritize their most frequently used measurements
| - Favorite conversions and reverse toggle buttons would reduce repetitive navigation for frequent users
| - Customizable result separators and saved conversion lists would improve workflow efficiency for frequent users
| - Advanced mathematical features
| - Apple Watch integration requested to enable quick calculations from the wrist
| - Advanced scientific functions
| - | |
| Strategic Intel |
| Strengths | - Formula-display mechanism provides educational value for students
- Minimalist UI reduces cognitive load for single-task users
| - 400+ unit library provides broad utility for niche engineering segments
- Offline currency conversion ensures functionality in low-connectivity environments
| - Minimalist interface design reduces cognitive load for daily tasks
- High-precision rounding logic supports professional-grade utility
- iPad multitasking integration drives power-user retention
| - Multi-language unit library functions as a B2B distribution barrier into international markets
- Offline-first architecture ensures utility in travel environments
- Scientific prefix support targets high-value technical users
| - Clean interface design reduces churn by avoiding intrusive ad-bloat
- Offline-first architecture ensures utility in field environments
- Custom unit-saving mechanism embeds the app into specialized professional workflows
| - French-specific linguistic library creates a niche barrier against English-centric conversion suites
- High-visibility interface reduces friction for administrative check-filling tasks
| - Ad-free business model increases long-term user trust
- History tape functionality creates high switching costs for professionals
| - 60+ theme library drives organic install velocity
- Lightweight startup speed outperforms default system calculators
| - Focused GCF-based workflow reduces cognitive load for students [Segment: Students]
- Step-by-step explanation logic provides educational value beyond simple output [Feature: Step-by-step]
| - Specialized geometry library for 15 tank types
- Simplified interface reduces cognitive load
|
| Weaknesses | - Zero Android rating volume indicates failed platform adoption
- Lacks home screen widgets compared to category incumbents
| - Lack of home screen widgets limits daily active usage
- One-time payment model restricts long-term revenue growth per user
| - Fixed category order creates navigation friction
- Lack of quick-switch menu between categories
- 0.02 rating gap between iOS and Android platforms
| - Navigation friction caused by long lists
- Lack of fractional imperial units
- Missing pressure measurement types
| - Premium tier lacks clear value-add differentiation
- 0.7★ rating gap between platforms suggests inconsistent feature parity
- No cloud-save functionality despite user requests
| - Ad-supported model creates session churn
- No offline-save capability despite student-demographic reliance on low-connectivity environments
| - Widget functionality failures erode premium user utility
- Intrusive rating prompts drive negative sentiment
| - Premium tier lacks professional-grade utility features
- Ad-heavy free experience creates churn friction
| - $0.99 price point on iOS vs free Android version creates platform-parity friction [Pricing: iOS vs Android]
- Lack of calculation history tapes limits utility for complex multi-step problems [Feature: History]
| - $3.99 iOS price point above category median
- No cloud-save for calculation history
- 0.7★ rating gap between Android and iOS
|
| Pricing | free | freemium | free | free | freemium | freemium | paid | subscription | freemium | freemium |
| Momentum | Zombie | Zombie | Zombie | Maintenance | Zombie | Maintenance | - | Maintenance | Maintenance | Maintenance |
| Update Cadence | 2 versions, ~107d avg | 2 versions, 1 majors/6mo, ~1082d avg | 2 versions, ~352d avg | 2 versions, ~857d avg | 2 versions, ~631d avg | 1 versions, 1 majors/6mo | - | 2 versions, 1 majors/6mo, ~28d avg | 3 versions | 2 versions, ~587d avg |
