Show Dev: I built a fast offline calculator hub with Next.js & Cloudflare
Source: Dev.to
Introduction
Hi everyone! I’m a full‑stack engineer and, like many of you, I’m tired of “utility” websites that are bloated with ads, cookies, painfully slow, and overloaded with trackers.
So I decided to build qalc.ai — a clean, lightning‑fast hub for calculators and practical tools that actually respect the user experience. It works fully offline after the first load, has no intrusive pop‑ups, and only a single small banner ad that can be closed for the entire day without interrupting anything.
Originally, I built most of these tools for myself — things I was constantly calculating or Googling while working with finance, crypto, and everyday conversions. Over time, it turned into a growing collection of calculators and productivity tools that I now keep expanding.
The Tech Stack 🛠️
- Frontend: Next.js (App Router) for SSR + ISR
- Styling: Tailwind CSS with shadcn UI
- Edge & SEO: Cloudflare caching + IndexNow for instant indexing
- Logic: Pure TypeScript (no heavy backend)
UX Philosophy
- Works offline
- No clutter
- No annoying ads
- No tracking
- Just input → result
I’d Love Your Feedback 🎤
I’d really appreciate a technical roast or constructive feedback:
- Performance: Does it feel instant?
- UI/UX: Is navigation clear?
- Features: What calculator or tool do you Google most often?
Thanks for checking it out — happy hacking! 🚀