About Osvian

What we make

Osvian is one quiet toolkit, not a pile of disconnected calculators. Each tool answers a single question — how long until this debt is paid off, what your daily calorie needs are, what to charge for a job — and then gets out of your way. The tools cover three areas: money, health, and business for small operators. They run in your browser, so you get an instant answer with nothing to install and no account to create.

Our honesty contract

We hold ourselves to four standing promises. They are not marketing; they describe how the product actually works, and we won't add a feature that breaks one of them.

• Just the answer. The calculator is the first thing on every page. The explanation, the formula, and the fine print sit below the result, never in front of it.
• No funnel. There is no signup, no email wall, no ads, and no "check your rate" lead-gen. We don't gate the result behind your contact details.
• We show our work. Every tool names the formula it uses and cites the source behind it. On tools whose data changes over time — tax tables, inflation figures — we show when we last reviewed them.
• Your numbers stay yours. Calculations happen in your browser. We don't send what you type to a server, and we don't have an account system to store it in.

How we make money

Right now, we don't. Osvian has no ads, no paid tier, no affiliate links, and no lead-generation deals — the kind of arrangements that quietly turn a "free" calculator into a sales funnel. If that ever changes, we'll say so plainly on this page before it happens. We would rather the tools stay honest than turn your question into a lead.

Your numbers stay yours

The numbers you enter are calculated in your browser and are not sent to us. We have no login and no server-side database, so there is no account holding your data. A few tools that keep a log — like a blood-pressure or medication list — save it in your browser's local storage on your device, and you can clear it at any time. On our most sensitive tools, including the cycle, ovulation, and pregnancy tools and the doctor-visit prep tools, we run no analytics at all. For the full picture of what we do and don't collect, see our privacy page.

How we show our work

We believe a calculator you can't check isn't worth trusting. Each tool shows the formula it uses and links the authoritative source behind it — the IRS, the CDC, the WHO, the BLS, and similar bodies. Our methodology page explains how we choose formulas, what we mean by "estimate," and how often we review the tools that go out of date. We are not a financial, medical, or legal adviser, and we never invent reviews, ratings, or "reviewed by" credentials we don't have. The outputs are educational estimates to help you think — see our disclaimer for what that means for each kind of tool.

Contact

Found a mistake, an outdated number, or a tool that's behaving oddly? Email us at [email protected] and we'll take a look.