Game-night recaps, a reading log, a solo RPG, and free calculators, from a one-person Seattle workshop.
Six Axes: one pilot GM’s six campaigns. Litmus: all accounts, many shelves imported from Goodreads. Both as of September 30, 2026, test accounts left out.
Two for the game table, one for readers, one for people selling what they make, and one still on the bench.
A solo tabletop RPG with an AI game master
Tell the game master the kind of world you want, in your own words. It builds the setting, draws the map, voices every character, and rolls fair dice while you play.
Session notes and stats for tabletop RPG groups
A Discord bot records each player on their own track, or a Chrome extension catches every D&D Beyond roll. After the game, Six Axes drafts the recap, updates the campaign wiki, and logs every attack, save, and hit point.
A reading tracker that shows whose voices you read
Shelves, ratings, streaks, and book clubs, on the web and Android. Litmus reads the author and theme data already attached to your books and shows the mix across your shelf. It never guesses about a person.
An AI marketing engine you can correct
Describe your product in a sentence. Shyll runs five stages, each checked against live web search: profile, market, channels, copy, and playbook. Edit any stage and everything after it is marked stale until you rerun it.
A run log for people who make things. Log every print, cut, and job in one place, and get job costing and machine calibration that improve as your history grows.
They run in your browser, so your numbers never leave it. All four share one statistics core that passes its 26 self-tests. Each is shown with its built-in example.
Enter visitors and conversions for each version. You get the chance each one is best and what picking wrong would cost.
Next step: Shyll finds the channels worth testing.
Turns a landing-page smoke test into projected buyers and profit, from worst case to best, before you pay for a production run.
Next step: SpoolStack, once it ships.
Weighs each piece of evidence by who gave it. A stranger who paid counts for more than a friend who said it sounds cool.
Next step: Shyll maps the market around the idea.
Flags leading, loaded, and two-in-one questions and suggests a neutral rewrite, then reads your responses with a proper margin of error.
Next step: Shyll turns what you learn into copy.
Kerf and Code is Terry Mickail, a measurement scientist in Seattle who also likes to make things. He built QuestSolo, Six Axes, Litmus, Shyll, and the four free calculators, is building SpoolStack, and took every shop photo on this page.
Questions, bugs, or a product you want built: write to him directly.