| Core Identity |
| Developer | DOUBLE U s.r.o. | 7th Gear | Nitrio | Enbright LLC | smalltech sarl | MobArts | Rome Rock LLC | ZipoApps | Oyku Gul Imran | Webtoweb |
| Category | Utilities | Utilities | Utilities | Utilities | Utilities | Utilities | Utilities | Utilities | Productivity | Tools |
| Platform | Android, iOS | iOS | iOS | iOS, Android | iOS | iOS | Android, iOS | iOS, Android | iOS, Android | Android |
| Store Metrics |
| Rating | 4.7 / 5 | 4.7 / 5 | 4.0 / 5 | 5.0 / 5 | 4.4 / 5 | 4.8 / 5 | 4.7 / 5 | 4.6 / 5 | 0.0 / 5 | 4.5 / 5 |
| Ratings Count | 288 | 60,844 | 8 | 3 | 275 | 3,095 | 967 | 1,142 | 0 | 2,687 |
| Price | Free | Free | $2.99 | $4 | Free | Free | Free | Free | Free | Free |
| Release Date | Nov 9, 2018 | Jul 30, 2011 | Jan 6, 2019 | Nov 16, 2024 | Sep 30, 2011 | Apr 13, 2011 | Mar 6, 2018 | Feb 24, 2012 | Jul 12, 2024 | Dec 6, 2018 |
| Last Updated | Apr 27, 2026 | Dec 9, 2020 | Jan 16, 2026 | Apr 27, 2026 | Apr 13, 2020 | Feb 28, 2026 | Oct 31, 2023 | Apr 9, 2025 | Jul 12, 2024 | Jan 7, 2026 |
| Sentiment & Reviews |
| Sentiment | positive | - | excellent | excellent | - | - | positive | - | excellent | positive |
| Score | 82/100 | - | 90/100 | 90/100 | - | - | 75/100 | - | 92/100 | 85/100 |
| Praises | - Simplified time math calculations allow users to manage work schedules and logbooks without manual conversion
| - | - The core application experience provides a satisfying and enjoyable utility for the user base
| - Minimalist design philosophy avoids intrusive advertisements and recurring monthly subscription costs for users
| - | - | - 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
|
| Complaints | - Aggressive advertising and subscription renewal issues disrupt the user experience for those who paid for ad removal
| - | - | - | - | - | - 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
|
| Requests | - Pure hours and minutes display format requested to replace the default days, hours, and minutes structure
| - | - | - | - | - | - 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
|
| Strategic Intel |
| Strengths | - Specialized time-math logic eliminates decimal-conversion errors
- Memory keys solve professional work-hour tracking pain points
| - 75-significant-digit math engine supports professional-grade accuracy requirements
- Tactile leather-texture UI provides a distinct visual identity on iPad
- Integrated drawing and notes tab enables hybrid math-and-scratchpad workflows
| - Focused interface tuned for motor physics
- Lightweight footprint avoids calculator bloat
| - Minimalist design philosophy reduces cognitive load for daily math tasks
- Smart History feature increases utility for recurring financial tracking
- One-time purchase model builds trust with privacy-focused users
| - | - | - 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
| - Formula-display mechanism provides educational value for students
- Minimalist UI reduces cognitive load for single-task 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
|
| Weaknesses | - Persistent ads for paying users erode trust
- Lack of split-screen support limits multitasking
| - Aggressive subscription prompts for basic features drive negative sentiment
- Lack of graphing or equation-solving modules limits appeal to STEM students
- Ad-supported model creates friction compared to ad-free engineering alternatives
| - Premium tier at $2.99 above free category median
- Low review volume limits social proof
| - Premium tier at $4.00 above category median
- No scientific functions restricts addressable market
- Limited user base restricts organic discovery velocity
| - | - | - Navigation friction caused by long lists
- Lack of fractional imperial units
- Missing pressure measurement types
| - Zero Android rating volume indicates failed platform adoption
- Lacks home screen widgets compared to category incumbents
| - 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
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| Pricing | free | freemium | paid | paid | free | free | free | free | freemium | freemium |
| Momentum | Maintenance | Zombie | - | Intense | - | - | Maintenance | Zombie | Zombie | Maintenance |
| Update Cadence | 2 versions, 2 majors/6mo, ~203d avg | 1 versions | - | 5 versions | - | - | 2 versions, ~857d avg | 2 versions, ~107d avg | 2 versions, ~631d avg | 1 versions, 1 majors/6mo |
