Calm tools that do one job well
Single-purpose digital tools for money, work and life admin. Buy once, own the file, use it offline. No subscription, no account, your data stays on your device.
Pay once. Keep it.
Every tool is a one-off purchase. No monthly bill, no renewal email, no "your subscription will lapse." The file is yours.
Works offline. Always.
A single .html file that runs in any browser. Open it on a laptop on a plane, on a desktop with the wifi off, on a phone in a basement.
Your data, your machine.
Everything you type is saved to your own browser's local storage. Nothing is sent anywhere. We can't see it because there's no server to see it from.
Debt Snowball vs Avalanche Calculator
Type in your debts. The tool runs both payoff strategies at once — snowball (smallest balance first) and avalanche (highest interest first) — and shows you the date you're actually debt-free under each. With the total interest you pay either way. No subscription, no account, no third party seeing your numbers. The file saves to your own browser. Close the tab and the data stays. Move to a new laptop and your numbers move with the file.
Tools you own outright. Imagine that.
I counted my recurring software bill last month. Twenty-three subscriptions for tools I open twice a year and one I use every day. Together they cost more than my electricity.
We're building Plain the other way. Each tool is a single .html file you download once, open in your browser, and own forever. No accounts. No syncing. No "your trial expires in 14 days." The file is yours the same way a paid app from the 1990s was yours — except this one runs in every browser on every device you'll ever own.
Your data stays on your machine because the tool has no server to send it to. You can read the source to verify that. You can't read the source of a SaaS product.
Plain isn't trying to be the next $100M productivity platform. We're a small studio that ships small, calm, useful things. If you've quietly gotten tired of every tool turning into a $19/mo subscription with a notifications system and an AI feature you didn't ask for — Plain is the other thing. Open the file. Use it. Close the tab.
— The Plain team
A handful to start with
13 of 46 live · see all →More tools landing soon
We're publishing one category at a time, end-to-end tested before each tool goes live. Coming next:
Common questions
Do I have to subscribe?
No. Every Plain tool is a one-off purchase. You pay once, you keep the file forever. We have no monthly plan and no plan to add one.
Where does my data go?
Nowhere. The tools run in your browser and save to your own device's local storage. We never see what you enter — there's no server to send it to.
What if it doesn't work for me?
14-day no-questions refund. Email hello@byplain.com inside two weeks of buying and you get your money back. No form, no survey, no hard feelings.
What's the license?
Personal use. Use it on every device you own, forever. Don't redistribute the file or resell it as your own — but feel free to share screenshots, send the byplain.com link, or recommend it loudly.
Will it still work in five years?
Yes. Each tool is a single .html file that runs offline. As long as your browser opens HTML — which will be a long time — the tool keeps working. No company you depend on can pivot, sunset, or get acquired out of existence.
Are there hidden upsells inside the tools?
No upsells, no ads, no pop-ups, no "unlock pro" buttons. What you bought is what you bought.
Browse the full catalogue
46 tools live today, each a single .html file you can read, save, and keep. New ones land most weeks.