ToolBoro
Free, fast, privacy-first online calculators, converters, text tools, and developer utilities that run 100% in your browser.
Developer Tools·Health & Fitness·Finance
What is ToolBoro?
ToolBoro is a free collection of online micro-tools and calculators, including financial calculators, text converters, and developer utilities. According to the page, it offers more than 15 tools that run entirely inside the browser tab, so no server calls are made and no data is stored in a database.
The site is aimed at anyone who needs quick everyday calculations or simple utilities without signing up. Popular categories include Finance, Health, Text and Words, and Developer tools. Examples listed on the page include a Real Estate and Rental ROI Calculator, a Compound Interest and Investment Calculator, a BMI Calculator, a Loan and EMI Calculator, a Word and Character Counter, a Secure Password Generator, a QR Code Generator, and a JSON Formatter and Validator.
What sets it apart, according to the page, is the privacy and speed model. The page states that user data never leaves the device, there is no tracking, no account is required, and there are no ads or popups. Because everything executes locally, the page also notes that the tools are ready to work offline.
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FounderPlaybooks.
What other founders did to grow.
2722 dispatches from hundreds of founders, pulled from the week's best podcasts.
You can link to your products or to your company somewhere in there, but it should not be the front and center call to action — because then people will be suspicious of your intentions, and they may not react as strongly to what is valuable content.
Bury the CTA — the product link belongs deep inside genuinely helpful content
An overt product CTA in Reddit-style helpful content kills conversion because readers smell the pitch. Keep the link deep inside the post and make the content stand on its own — the click-through rate is higher when the audience has already been helped.
Our expense number one is Meta and TikTok, then maybe a little bit of Google, maybe a little bit of Apple search. I'd say a third is somehow accurate — a third of our revenue, that is.
Paid ads cost roughly one third of revenue — track CAC as a share, not a number
Paid acquisition runs at roughly one third of revenue, with Apple's 15% cut and a small infrastructure plus AI bill on top. A bootstrapped consumer app can stay highly profitable when CAC is tracked as a fixed share of top-line rather than an absolute number.
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