Tools built for
entrepreneurs.
We build simple, practical digital tools that help online sellers and entrepreneurs make better decisions — for free.
8+
Free web tools
10+
POD providers tracked
378
Holiday calendar events
iOS
DOKR PDF Pro
Our Products
Everything we've built
Chayaani
Free POD profit tools for online sellers
8 free tools built for print-on-demand entrepreneurs — profit calculator, Etsy fee calculator, break-even planner, seasonal calendar, mockup generator, and more. No sign-up, works instantly in your browser.
- PODMargin Calculator
- Etsy Fee Calculator
- Break-Even & ROI
- Product Catalog
- Design Size Guide
- Seasonal Calendar
- Mockup Generator
- Etsy Keywords
DOKR PDF Pro
Scan, sign, fill & manage PDFs on the go
A powerful PDF toolkit for iPhone and iPad. Scan documents with your camera, sign PDFs with your finger or stylus, fill forms, merge files, and manage your document library — all offline, all private.
- Camera document scanner
- Sign with finger or Apple Pencil
- Fill PDF forms
- Merge & split PDFs
- Offline — no cloud required
- Share & export anywhere
About TSN Studio
TSN Studio is an independent studio building digital tools for e-commerce entrepreneurs and everyday users. We believe that powerful tools shouldn't require expensive subscriptions or complicated setup.
Everything we build is designed to be fast, private, and useful from the moment you open it — whether on the web or on your iPhone.
Need DOKR PDF Pro support?
Find help, view our privacy policy for the app, or reach out to us directly.