Useful tools.
Documented experiments.

Tools, Data & Experiments for Digital Product Sellers.

IY Digital Lab is an independent project operated from Japan. We build practical tools and document digital product selling experiments, with clear assumptions and source links.

What we publish

Free web tools, guides and observations. Our first tool estimates Etsy profit; our first experiment follows a new Etsy shop. Future topics may include Gumroad, KDP and localized Japanese marketplaces.

How we work

We separate measured outcomes from estimates. Missing data stays blank. Tools and guides are reviewed against official sources; they cannot guarantee sales or profit.

Privacy & independence

Calculator inputs are processed in your browser. This version uses no analytics, cookies or advertising trackers. Hosting may process request information to serve the site. There are currently no affiliate links. Any future affiliate content will be identified. We are not affiliated with Etsy.