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Here is a list of some good construction apps for the iPhone.

Measurements

: A handy unit conversion tool. Includes length, area, volume, pressure, energy and more. Price: $0.99

: Allows your to draw specs and measurements on photos. Price: $5.99

: A calculator than handles fractions, which makes working with measuring tape easier. Price: $0.99

: Construction calculator with special functions for calculating things like stair length and roof pitch. Price: $9.99

Tools

: Calibrate using the iPhone’s tilt sensors and lay your iPhone on whatever you want to make sure is level. The best iPhone level app. Price: $0.99

: This app takes very large measurements using the iPhone’s GPS feature. Stand one place and mark the beginning of a measurement, then move to another place and take the end of the measurement. GPS usually isn’t very accurate, so this is better for measuring, say, a lot than a couch. Price: $0.99

: This app takes care of small measurements – small, as in no bigger than the iPhone’s screen. Price: $0.99

LEED (Leadership in Energy and Environmental Design) apps:

: A good app for learning about LEED. Price: $4.99

: Tally LEED credits for construction projects to track paths to certification. Price: $3.99

Other things:

: Best weather app for forecasts, severe weather alerts and a really useful radar map. Price: Free

: The simplest and best language translation app. Price: free