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Plainso
✓ Verified ownerUsers can run business and money calculations without an account, or embed the same tools on their own website in minutes.
Plainso offers free, browser-based calculators and estimators covering freelance rates, project pricing, margins, loans, and other business and money figures.
- Freelancers pricing their time and projects
- Founders and small teams estimating costs
- Agencies adding calculators to their sites
- Website owners seeking interactive lead capture
Features
- Free calculators — Calculators and estimators across freelance, business, money, and math categories.
- One-line embeds — Copy a single iframe snippet to add a tool to any website.
- Theme and size controls — Set light or dark theme and adjust iframe width, height, and corner radius.
- No account required — Tools run entirely in the browser with no sign-up or API keys.
- Embeddable quizzes — Answer-based tools such as 'Which tool do you need?'
Pros
- All tools are free to use and free to embed.
- Embeds work on WordPress, Shopify, Webflow, Squarespace, Wix, Ghost, and plain HTML.
- No account, API keys, or coding are required.
- Tools run entirely in the browser.
Cons
- The 'Powered by Plainso' branding cannot currently be removed.
- Custom branding and lead capture are not yet available.
- A paid tier with extra features is planned but not launched.
- Embed colours and fonts follow the embed's own theme rather than per-pixel overrides.
Overview
Plainso is a collection of free, browser-based calculators and estimators aimed at freelancers, founders, and small businesses. The toolset spans freelance rates, project quotes, profit margins, break-even analysis, ROI, startup runway, salary conversion, loans, discounts, VAT, and other money and math figures. Each tool runs entirely in the browser with no account, and the site also offers embeddable quizzes that help a visitor choose between options.
The site's second focus is embedding. Every tool can be placed on another website with a single iframe snippet, and the embed section explains how to copy the code and paste it into WordPress, Shopify, Webflow, Squarespace, Wix, Ghost, or a hand-coded page. Embeds can be set to light or dark theme, resized through the iframe's width and height, and adjusted with a corner radius. Plainso states that embedding is free and shows a small 'Powered by Plainso' link, and that branding removal, custom branding, and lead capture are planned for a future paid tier rather than being available now. The site also publishes guides and a blog covering the math behind each calculator.
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