Drugs.com Interaction Checker
drugs.com
Lists the interactions between the medicines, supplements and alcohol you enter
No sign-up
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Track, calculate and decide the ordinary things.
drugs.com
Lists the interactions between the medicines, supplements and alcohol you enter
exrx.net
An exercise library that names the muscles each movement actually works
fdc.nal.usda.gov
The USDA's laboratory-measured nutrient data for tens of thousands of foods
kingarthurbaking.com
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
metric-conversions.org
Converts between metric and imperial units and shows the working formula
omnicalculator.com
Around 3,000 small calculators, each with the formula shown underneath
openfoodfacts.org
Scan a barcode and see the ingredients, additives and processing level
sleepfoundation.org
Explains sleep with a medical review panel, plus bedtime and cycle calculators
splitwise.com
Tracks who paid for what in a group and works out the fewest transfers to settle
Questions
There is no single answer, which is why this page lists 10 of them with their limits stated. If you want to avoid signing up entirely, 9 of these work with no account at all.
Every site in this category sends your input to its own server to do the work. That is fine for public material; for anything containing personal data, check the on-device collection instead.
Nothing in this category has shut down so far. When something does, it moves to the Archive with a named successor rather than being deleted, so the answer to "what replaced it" survives.