Stoichiometry Calc
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100 calls/day, no card, no spam. Built by one person, in public.
About Stoich
Stoich was built for the moment you just need to handle this task and move on — no signup, no upload to a third-party server. Everything happens client-side, which means your files and data never leave your machine. The interface is intentionally minimal so you can focus on the task instead of learning the tool. It is one of about a hundred utility tools that share the same philosophy: do one thing, do it well, get out of your way.
When you'd reach for Stoich
You're hitting the daily limit of a paid SaaS and need a backup option for a single quick job.
Marketers and ops people whose primary tool is metered.
Stay productive without burning credits.
You're on a public or shared machine and don't want to leave traces of what you're working on.
Travelers, contractors, anyone working from a friend's computer.
Nothing is uploaded, nothing persists if you're not signed in.
You're cleaning up a folder of files that accumulated over a project and need to standardize them.
Designers, writers, and developers wrapping up deliverables.
Drop each file in, copy the output, move on.
You need to handle a one-off task right before a meeting and don't have time to install anything.
Anyone working remotely on a borrowed or restricted machine.
Open the page, get the result, paste it into your doc — under a minute.
Frequently asked about Stoich
- Will Stoich change my original file?
- Never. Stoich only reads your input file and produces a new output file.
- Do I need to create an account to use Stoich?
- No. Stoich works without any signup. We only ask for an email if you decide to subscribe to a paid plan.
- Are my files uploaded to a server when I use Stoich?
- Stoich processes everything in your browser using local APIs. Your files never leave your device.
- Does Stoich work on mobile?
- Yes, Stoich is fully responsive and tested on iOS Safari and Android Chrome.
- Can I use Stoich commercially?
- Yes. The output of Stoich belongs entirely to you, with no licensing restrictions.
