Drugs.com Interaction Checker
drugs.com
Lists the interactions between the medicines, supplements and alcohol you enter
No sign-up
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splitwise.com
Tracks who paid for what in a group and works out the fewest transfers to settle.
Add a shared expense, choose how it splits — evenly, by share, by exact amount — and it keeps a running balance per person, then simplifies the web of debts into the smallest number of payments at the end. It is the standard answer for flatmates and holidays because everyone can log their own spend from their own phone. Settling up happens outside the app in most countries.
AltFTool does this too
If you would rather not leave the site, Group Expense Splitter covers the same job here — free, no account, and it runs in your browser.
Open Group Expense SplitterQuestions
A genuinely usable free tier with paid plans for volume or team features. The free tier now caps how many expenses you can add per day and shows ads between entries; currency conversion, receipt scanning and export are Pro.
Yes. Splitwise 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 free tier now caps how many expenses you can add per day and shows ads between entries; currency conversion, receipt scanning and export are Pro.
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
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