It uses the phone's mic to listen for sound of coin hitting the floor (which means the app works best in quiet environments).
When used correctly (see the guide below), it can measure with an accuracy close to 1/2" (1cm) for heights up to 3 meters. Welldrop is a handy tool for when a measuring tape isn't available or the height to measure is too high for tape.
Theory of operation is simple: you drop a small coin from 0.5cm (1/4") above the edge of your phone. Welldrop will measure the time between when the coin hits the phone and when it hits the ground. Using some simple physics magic, it calculates the drop height.
Welldrop shows the measured height in both metric and imperial systems. Just tap the figure to switch between the two.
Get source code for this app at https://github.com/oxplot/welldrop
We do not host Welldrop on our servers. We did not scan it for viruses, adware, spyware or other type of malware. This app is hosted by Galad and passed their terms and conditions to be listed there. We recommend caution when installing it.
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| Downloads: 12 | ||||
| Updated At: 2026-10-07 00:28:08 | ||||
| Publisher: Mansour Behabadi | ||||
| Operating System: Android | ||||
| License Type: Free |