The idea behind this one is easy to relate to. The maker wanted bags in custom dimensions but got worn down by the arithmetic, especially redoing curve calculations over and over for every new size. So they built a free web tool that turns entered measurements into a printable PDF pattern, and pattern drafting is something they feel should be open to everyone.
Putting a pattern together looks straightforward. Dropdowns cover clutch, tote, and bucket bag designs, and button selectors let you pick what the bag will carry, like a smartphone, tablet, laptop, or tumbler. Sliders handle the width-to-height ratio, the top-to-bottom width ratio, base shape, and corner roundness on the base, and a preview panel redraws an outline graphic as you move them.
Several details stand out to me. The sheets label each part, from base pattern and main body to reinforcement, lining facing, and handle layouts, and they note things like a zipper finished length of 452 mm. There is a 50 mm calibration bar on each sheet to verify printing accuracy, downloads come print-ready at scale for A4 or A3, and the patterns target leather around 1.0 to 1.2 mm thick. No signup or email is needed and downloads are unlimited. The interface was coded with help from Claude, though the designs and formulas come from the maker's own leathercraft experience.
One thing to keep in mind: the maker assumes crafters will handle partial skiving and choose suitable reinforcements for each bag shape themselves. The tutorial videos for the clutch and tote are up but in Korean only so far, with a bucket bag build tutorial promised soon.