| Core Identity |
| Developer | 42nd Parallel | Calculated Industries | Calculated Industries | Procore Technologies, Inc. | Hilti Fieldwire, Inc. | Impala Studios |
| Category | Utilities | Utilities | Utilities | Business | Business | Utilities |
| Platform | iOS, Android | Android, iOS | Android, iOS | iOS, Android | iOS, Android | Android, iOS |
| Store Metrics |
| Rating | 4.7 / 5 | 4.9 / 5 | 4.9 / 5 | 4.6 / 5 | 4.8 / 5 | 4.7 / 5 |
| Ratings Count | 68 | 37,538 | 4,036 | 43,088 | 12,905 | 1,715,926 |
| Price | USD24.99 | Free | Free | Free | Free | Free |
| Release Date | Oct 14, 2009 | May 5, 2010 | Sep 8, 2010 | Jun 3, 2010 | Dec 20, 2013 | Oct 22, 2010 |
| Last Updated | Mar 29, 2026 | Apr 16, 2026 | Jan 31, 2026 | Apr 15, 2026 | Apr 14, 2026 | Apr 23, 2026 |
| Sentiment & Reviews |
| Sentiment | excellent | - | positive | - | - | mixed |
| Score | 85/100 | - | 75/100 | - | - | 45/100 |
| Praises | - Advanced stair and baluster layout functions save significant time for professional carpenters on job sites
- Responsive customer support provides rapid solutions to technical issues for long-term professional users
| - | - High precision and reliability in construction calculations keep professionals engaged across multiple project types
| - | - | - All-in-one utility including scientific functions and unit converters provides significant daily value
|
| Complaints | - Input field logic automatically erases user values when calculating irregular hip roof dimensions
- Lack of a dedicated refresh button forces manual workarounds to clear calculation fields
| - | - Transition from lifetime purchase model to recurring subscription creates significant friction for long-term users
| - | - | - Removal of the running total feature post-update disrupts established user calculation habits
|
| Requests | - Haptic feedback integration for button presses to improve tactile confirmation in field environments
| - | - Reintroduction of specific shortcut buttons to improve speed during repetitive construction measurement tasks
| - | - | - Integration of currency converter and memory functions into the core stock calculator experience
|
| Strategic Intel |
| Strengths | - Specialized stair-layout engine functions as a B2B distribution moat for professional documentation
- High-touch developer support drives retention among long-term professional tradespeople
- Interactive calculation logic reduces field errors compared to legacy hardware calculators
| - | - Specialized construction-math logic replaces physical hardware [Professional Segment]
- High-precision conversion engine sustains daily utility [Professional Segment]
| - | - | - 200 million download footprint provides massive top-of-funnel acquisition
- All-in-one utility design creates high daily session utility
- VoiceOver and high-contrast accessibility features expand addressable market
|
| Weaknesses | - Manual field-clearing workflow creates UI friction for high-frequency users
- Input logic overwriting custom values during roof calculations disrupts professional workflows
- Android version lacks feature parity with the iOS build
| - | - Subscription-only model triggers legacy user churn [Monetization]
- 0.38★ Android-iOS rating gap indicates platform-specific regression [Platform Quality]
| - | - | - Removal of running total feature disrupts power-user calculation habits
- Aggressive subscription prompts drive high churn in the free tier
- UI scaling issues on non-full-screen devices hinder input visibility
|
| Pricing | paid | freemium | subscription | free | freemium | freemium |
| Momentum | Intense | Active | Active | Intense | Intense | Active |
| Update Cadence | 5 versions | 5 versions | 5 versions | 5 versions | 5 versions | 5 versions, 3 majors/6mo, ~14d avg |
