Blog

How to Choose the Right POS System for Your Kirana Store in 2025

With hundreds of billing apps on the market, choosing the right POS for your kirana store can feel overwhelming. Here's what actually matters.

How to Generate App Icons for iOS, Android, macOS, and Web — The Complete Guide

Every platform demands different icon sizes, and manually exporting each one is a time sink. Here's the right way to handle app icons.

Why We're Building the Offline-First Business OS for Indian SMBs

75 million small businesses run India's economy. Almost none of them have software built for the way they actually operate. We're changing that.

GST Billing Software for Small Businesses: What You Need to Know

GST compliance doesn't have to be complicated. A guide to what good billing software must do for Indian small business owners.

Digital Payments for Small Businesses in India: UPI, QR Codes, and Beyond

India's payments revolution has reached every tea stall and vegetable vendor. Here's how small businesses can make the most of it.

Inventory Management for Indian Retailers: A Practical Guide

Overstocking ties up cash. Stockouts lose sales. Getting inventory right is the difference between a profitable store and a struggling one.

JWT Tokens Explained: What Every Developer Needs to Know

JWTs are everywhere in modern auth flows, but they're often misunderstood. A clear breakdown of how they work and where they go wrong.

Regular Expressions for Developers: A Practical Guide with Examples

Regular expressions are one of the most powerful tools a developer can know — and one of the most avoided. This guide makes them approachable.

CSS Gradients: The Complete Guide to Linear, Radial, and Conic Gradients

CSS gradients have become one of the most expressive tools in a frontend developer's kit. Master all three types and stop copying StackOverflow.

Why We Built a Suite of Free Developer Tools

We needed these tools ourselves. So we built them properly, made them free, and shipped them at tanvrit.com/tools. Here's the thinking behind it.

What India's 75 Million Small Businesses Actually Need from Software

A kirana in Patna, a parlour in Pune, a coaching centre in Kota — they're all small businesses, but they have very different needs. Here's what they share.

The Technical Stack Behind Tanvrit: How We Build at Scale

We build in public. Here's an honest look at every layer of Tanvrit's technical architecture — what we chose, why, and what we'd do differently.

UPI AutoPay for Indian Businesses: How to Set Up Recurring Payments

UPI AutoPay lets Indian businesses collect subscription fees, EMIs, and recurring charges automatically — no monthly invoice chasing. Here's how it works and how to set it up.

MSME Registration in India: Complete 2025 Guide for Small Business Owners

Udyam registration unlocks collateral-free loans, government tender access, and delayed payment protection. A step-by-step guide for Indian small business owners.

WhatsApp Business for Indian SMBs: From Customer Chats to Automated Orders

WhatsApp is already how Indian businesses communicate. Here's how to set it up properly — catalog, auto-replies, order management — and where its limits are.

GST Invoice Format Requirements in India: What Must Every Invoice Include?

A missing GSTIN or wrong place of supply can cost your customer their input tax credit. Here are the 16 mandatory fields and the rules every Indian business must follow.

How to Reduce Dead Stock in Your Indian Retail Business

Dead stock ties up capital, costs 20–30% of its value per year in carrying costs, and triggers GST ITC reversals. Here's how to prevent it and clear what you already have.

Base64 Encoding and Decoding: A Complete Developer's Guide

Base64 is everywhere — JWTs, data URIs, Basic Auth, MIME attachments — but few developers understand how the algorithm actually works. This guide covers the alphabet, the encoding steps, Base64URL, common use cases, and the pitfalls that trip up even experienced engineers.

UUID Guide for Developers: v4, v7, ULIDs, and When to Use Each

UUID v4 has been the default for years, but UUID v7 and ULIDs have changed the calculus. This guide covers every practical UUID variant, the B-tree index fragmentation problem, and a clear decision framework for choosing identifiers.

Unix Timestamps Explained: The Developer's Complete Reference

Unix timestamps underpin every date field in every system you work with — yet milliseconds vs seconds confusion, DST traps, and 32-bit overflow are a constant source of bugs. This guide covers conversions, timezone handling, the Year 2038 problem, and correct timestamp arithmetic.

SVG Optimization for Web Performance: Tools, Techniques, and Best Practices

An SVG from Figma or Illustrator can be 50–80% smaller after optimization with no visual difference. This guide covers SVGO, inline vs img vs CSS background tradeoffs, React SVGR integration, accessibility, and the pitfalls that break layouts in production.

JSON Formatting and Validation: A Developer's Practical Guide

JSON looks simple but hides real traps: float precision loss, BOM characters, circular references, and schema gaps that let malformed data propagate deep into a system. This guide covers JSON Schema, ajv, streaming parsers, JSON5/JSONC, and the jq command-line tool.