Zentrova Tools
Your Daily Intelligence Hub — 50+ free tools in one place
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Zentrova Tools - Your Daily Intelligence Hub — 50+ free tools in one place

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Live currency & gold rates, prayer timings for any city, CNIC/tax/loan calculators, and 40+ everyday utilities — all free, fast, and ad-free. Built for Pakistan, useful anywhere.

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Maker
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Hey Product Hunt! I'm Rana, and I built Zentrova Tools solo — it started as a personal project to stop juggling 5 different apps/sites for daily stuff (checking gold rates, namaz timings, currency conversion) and grew into 50+ free tools. A few highlights: 🕌 Live prayer times for any city worldwide, with countdown to next prayer 💰 Real-time gold/USD/crypto rates for Pakistan 🧮 30+ everyday calculators (BMI, GPA, loan EMI, tax, and more) ⚡ Everything runs instantly, no signup, no clutter Built with Next.js, fully free. Would genuinely love your feedback — especially which tool you'd want added next!

A nice all in one toolkit. One feature that would make it even more useful is offline access for prayer timings and currency rates, maybe with a small downloadable data cache so people can check them without internet during travel or load shedding.

Maker

 Hi Nihat, thank you for the fantastic feedback! You hit the nail on the head. Given the local context of load shedding and connectivity issues during travel, offline support is a huge priority.

My next major milestone for Zentrova Tools is implementing full PWA (Progressive Web App) capabilities. I'll be using Service Workers to cache the daily fetched prayer timings, basic calculator logic, and the latest currency rates locally on the user's device so they are always accessible offline. Really appreciate you highlighting this!

How does it keep the currency and gold rates updated in real time without ads or a paid tier backing it?

Maker

 Great question! The secret to keeping it free and ad-less lies in the architecture—specifically Next.js ISR (Incremental Static Regeneration).

Instead of hitting the external APIs on every single user request, the server fetches the live rates in the background at specific intervals (e.g., every 30-60 mins) and caches the static page globally. This drastically reduces the number of direct API calls, allowing me to stay comfortably within the free tiers of financial data providers. Since this is a community-first passion project, keeping it fast and ad-free was my top priority!

How does Zentrova keep the currency and gold rates updating in real time without any ads or fees to cover the data costs?

Maker

 Great question! The secret to keeping it free and ad-less lies in the architecture—specifically Next.js ISR (Incremental Static Regeneration).

Instead of hitting the external APIs on every single user request, the server fetches the live rates in the background at specific intervals (e.g., every 30-60 mins) and caches the static page globally. This drastically reduces the number of direct API calls, allowing me to stay comfortably within the free tiers of financial data providers. Since this is a community-first passion project, keeping it fast and ad-free was my top priority!