Software · Books · Art

Tools for the details that matter.

TDH Digital Works, LLC creates practical software for personal organization and recordkeeping, publishes useful books under Tanya Hammil, J. T. Willow, and Willow Press, and shares original watercolor paintings through Willow Press Art Box as printable tutorials.


Our software

PepFolio app iconPepFolio

PepFolio helps people organize peptide reference information and their own inventory, schedules, reminders, administration records, weight progress, and reports in one place.

Explore PepFolio, its screenshots, and download options.

Records entered in PepFolio are stored in a local database on the device. The app includes user-controlled backup and restore tools.

Purpose
Personal organization and recordkeeping
Platform
Windows and Android
Availability
Available now

PepFolio is an organizational and calculation tool, not medical advice. It does not diagnose conditions, recommend substances or doses, or determine whether a substance or schedule is safe or effective.

Willow Press Art Box

Printable watercolor tutorials.

Explore beginner-friendly digital lessons featuring spring, ocean, Halloween, autumn, and Christmas subjects. Each tutorial includes guided instruction and printable outline choices.

Explore the watercolor collection

Six printable watercolor tutorial paintings

New · Ocean Collection

Paint the sea, one easy lesson at a time.

Six original sea-life paintings, each turned into a beginner-friendly, step-by-step watercolor tutorial: a leaping dolphin, jellyfish, sea turtle, seahorse, starfish, and a seashell trio. Every lesson includes guided instructions and printable tracing outlines.

Get all six together in the Ocean bundle and save 30%.

New · Spring Collection

Paint a cheerful spring, one easy lesson at a time.

Six original garden and farm paintings, each turned into a beginner-friendly, step-by-step watercolor tutorial: a white hen, strawberry blossom, two geese, frog and dragonfly, daisy and bee, and a white rooster. Every lesson includes guided instructions and printable tracing outlines.

Get all six together in the Spring bundle and save 30%.

Books & publishing

Explore the library.

Discover books published under Tanya Hammil, J. T. Willow, and Willow Press. Browse the current collection, view the book covers, and find each title directly through Amazon.

Browse the full book library

Featured title

Nature's Healing Pantry

A featured title from the TDH Digital Works publishing library, available through Amazon.

View on Amazon