The latest articles on DEV Community by SadhanaBuilds (@sadhana_builds). https://dev.to/sadhana_builds https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4132929%2Ffeeab145-8b37-45ce-9bbc-8bc92be66b30.png https://dev.to/sadhana_builds en SadhanaBuilds Sat, 19 Sep 2026 14:01:52 +0000 https://dev.to/sadhana_builds/i-built-a-free-scientific-calculator-with-a-real-natural-math-display-no-signup-1gnp https://dev.to/sadhana_builds/i-built-a-free-scientific-calculator-with-a-real-natural-math-display-no-signup-1gnp <h2> Why I built this </h2> <p>Most free online calculators show math as flat text — 3/4 in one line, no real fraction rendering. That never felt right, especially compared to an actual physical calculator.<br> So I built OnlineScientificCalc — a free scientific calculator with a proper natural display. Fractions, integrals, derivatives all render the way they would on a real calculator screen.</p> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Farticles%2Fs558mz0p2ykhs4ss8bgv.jpeg" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Farticles%2Fs558mz0p2ykhs4ss8bgv.jpeg" alt=" " width="800" height="748"></a></p> <h2> Tech stack </h2> <p>Built with Astro.js + Tailwind CSS v4. Modeled after the Casio fx-991 layout (same buttons, SHIFT/ALPHA system) so it feels familiar if you've used one before.</p> <h2> Try it </h2> <p>🔗 <a href="https://onlinescientificcalc.com" rel="noopener noreferrer">https://onlinescientificcalc.com</a> — no signup, no download, works instantly. Also just launched this on Product Hunt today if you'd like to check it out there -&gt; <a href="https://www.producthunt.com/products/onlinescientificcalc" rel="noopener noreferrer">https://www.producthunt.com/products/onlinescientificcalc</a></p> <p>Would love feedback from this community — especially on performance, UX, or anything that feels off. This is my first shipped project and I'm planning to build more tools like this.</p> webdev showdev javascript productivity