DRUID

In-app purchases
3.9
164 reviews
10K+
Downloads
Content rating
Teen
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About this app

Druid is a test for personal and workplace use that measures the impairment of cognitive and motor functions. Available for all smartphones and tablets, users can choose with each use between either a 1-minute Rapid Test or a 3-minute Benchmark Test.

Grounded in cognitive neuroscience, Druid is a breakthrough technology. It brings you a sophisticated tool that measures impairment from any cause, including cannabis and other drugs, alcohol, fatigue, illness, injury, chronic condition, or severe stress. Druid operates like a video game while it measures hundred of neurophysiological indicators.

Start your free 14-day trial today.

Are your employees fit for duty? Employees impaired by drugs, alcohol, fatigue, or stress exhibit slower reflexes, impaired balance, and poor judgement. Impairment reduces productivity, increases liability costs, and magnifies employees' and co-workers' exposure to risk of injury or even death. The Druid app, coupled with Druid Enterprise, an online management dashboard, and database, allows employers to monitor and analyze their employees' fitness for duty. For Druid in the workplace, please contact info@impairmentscience.com.
Updated on
Oct 20, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info and Device or other IDs
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

3.9
162 reviews
Cove Arts Photography
September 28, 2024
The individual scores may bear a resemblance to reality, but the aggregate score calclation is broken. No matter my individual score results, the aggregate reports a 75 - the worst possible score - every test except the 1st 2 times I ran the app. Since then, it's latched to 75 - the end of Druid's scale. Further to that note, as anyone with measurements expertise can tell you, if you attempt a measurement and you hit either limit of your scale, you are no longer measuring anything. #fail
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Jimmy Nguyen
November 28, 2025
Very cool app. Likely a good way to test for impairment but I can't say accurately since I've never tried any other apps before using this or have a lot of experience with impairment testing in general. However, I've done a couple testing sessions of the app for this company in the past and it does seem to know when I'm (very) impaired. Furthermore, the company staff are a very nice team of people and they seem to be very actively tweaking the algorithms.
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ones imus
December 17, 2020
i don't drink.... Much, but I do have a chronic health condition which produces impairment. Until now, and finding druid, there wasn't really any way of assessing the level of impairment. I'm finding it to be a useful tool in self-assessment. Do wish however, that the score would be broken down by the individual tests. Thank you.
8 people found this review helpful
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What’s new

Fixes and Improvements

App support

Phone number
+16177850353
About the developer
IMPAIRMENT SCIENCE, INC.
info@impairmentscience.com
1035 Cambridge St Ste 1 Cambridge, MA 02141-1154 United States
+1 617-612-5800