Construction Calculator vs SkyChrono

Build faster, measure smarter. Pro² is a complete construction calculator for decking, roofing, concrete, stairs, framing and precise on-site measurements. It’s made for builders, carpenters, contractors and serious DIY who need accurate answers in seconds. DECKING & FLOORING • Area, board runs, spacing and waste allowance • Material takeoff for boards and joists ROOFING (METAL & TILE) • Coverage and sheet/tile counts • Overhangs, pitch, angle and rafter length helpers STAIRS & STRINGERS • Rise/run, slope %, angle (°) and stringer length • Clear breakdowns and step-by-step visuals BALUSTERS, RAILING & EVEN SPACING • Perfect marks from 0 to full length • Spacing tables for clean, consistent layouts CONCRETE, ASPHALT, GRAVEL & SOIL • Volume estimators for slabs, pads, footings and fills • Smart rounding for real-world quantities SLOPE, PITCH & ANGLES • Fast framing helpers for cuts and layout • Metric and imperial support in every tool UNIT CONVERTER • Length, area, volume, density and weight • Built for mixed-unit jobs (mm, ft, inches) QUICK CALCULATOR • Running history with one-tap copy/share MADE FOR THE JOBSITE • Fraction support and practical defaults • Works fully offline—no signal required • Clean visuals that stay readable outdoors WHY PROS USE PRO² • One app instead of juggling multiple separate tools • Accurate results, simple inputs and clear diagrams • New tools and improvements arrive regularly based on user feedback Pro² is built for professional construction, carpentry, decking, roofing and framing work—yet intuitive enough for DIY home projects. Upgrade to unlock additional tools and advanced features when you’re ready to grow your toolkit. SUBSCRIPTION TERMS • Carpenter Pro is an optional auto-renewing subscription with Weekly and Annual plans. • A 3-day free trial is available on the Annual plan. • Payment is charged to your Apple ID and subscriptions renew automatically unless cancelled at least 24 hours before the end of the period. • You can manage or cancel your subscription in your App Store account settings. • Lifetime is a one-time purchase and does not auto-renew. • The localized price is shown in-app before you confirm. Terms of Use (Apple EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://shapkin.dev/apps/carpenter/privacy.html

SkyChrono is a real-time astronomical dashboard for anyone who plans around the sky—astronomers, astrophotographers, navigators, and curious stargazers. SUN • Live altitude & azimuth • Sunrise, sunset, and solar noon • Civil / nautical / astronomical twilight • Current lighting state (day, twilight, night) + day length MOON • Current phase with illumination % • Moonrise & moonset • Live altitude & azimuth • Phase progression at a glance TIME SYSTEMS • Local time + timezone • UTC • Julian Date (JD) / Modified Julian Date (MJD) • Greenwich Mean Sidereal Time (GMST) • Local Sidereal Time (LST) LOCATION • Automatic GPS position (optional) • Manual coordinates anywhere on Earth • Decimal degrees or DMS input ALERTS & NIGHT MODE • Notifications for sunrise/sunset, twilight boundaries, golden hour, and major moon phases • Night Vision mode (red theme) to preserve dark adaptation EXPORT & LEARN • Save the dashboard as a high-resolution image • Export data as JSON, or copy any value with a tap • Built-in explanations for key astronomy concepts PRIVACY FIRST • No ads, no subscriptions • No tracking—your location stays on device • Manual location mode for complete control SkyChrono helps you pick the right moment—whether you’re planning a shoot, observing, or learning celestial mechanics.