About Day21

Day21 is an independent software studio based in the United States. We build focused tools — browser extensions that do one job well, with your privacy as the default, not a setting.

Why "Day21"

They say it takes 21 days to form a habit. That is the bar we build for: a good tool should disappear into your routine — something you reach for without thinking, that works every time, and that never asks for more than it needs.

How we build

• One job, done well. Every product has a single, clearly stated purpose. No feature sprawl, no upsell mazes.
• Privacy-first. We collect as little as possible — and wherever possible, nothing at all. Processing happens on your device unless a feature genuinely requires otherwise, and each product's privacy policy states exactly what it does.
• No dark patterns. No nagging, no fake urgency, no hard-to-cancel anything.
• Plain-language legal. Our privacy policies and terms are written to be read, not skimmed past.

What we make

We currently publish the Bulk Social Media Downloader browser extension, with more tools in the works. You can find every product, and the legal documents for each, on our legal page.

Get in touch

Questions, feedback, or anything else — see the contact page or write to day21dev2026@gmail.com.