Drugs.com Interaction Checker
drugs.com
Lists the interactions between the medicines, supplements and alcohol you enter
No sign-up
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exrx.net
An exercise library that names the muscles each movement actually works.
Over two thousand exercises indexed by muscle group and equipment, each with an animation, execution notes and a full agonist/synergist breakdown, alongside reference articles on programme design and fitness testing. It has been the reference for trainers and physios since the late 1990s, and it cites the kinesiology rather than asserting it. The site looks its age, which is the price of it still being here.
Questions
Works the moment the page loads. No account, no email, no trial. The interface is dated and search is weak, and some calculators and articles sit behind a paid Premium tier.
Yes. ExRx.net sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
The interface is dated and search is weak, and some calculators and articles sit behind a paid Premium tier.
Alternatives
Same category or same task, ordered by how closely they overlap.
drugs.com
Lists the interactions between the medicines, supplements and alcohol you enter
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Gives the gram weight of a cup of every baking ingredient you are likely to use
medlineplus.gov
Plain-language health information from the US National Library of Medicine
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Converts between metric and imperial units and shows the working formula
omnicalculator.com
Around 3,000 small calculators, each with the formula shown underneath