I'm Gavin Kohn, a builder-operator out of Ohio. I design, build, and run my own software business, including a 5-brand data network and other fun builds.
Recent builds: Street Time Machine, Patchwork, Roofline · See more
Four live storefronts and a free data map, one engine, zero employees. Pick a geography, build a list, pay, and the CSV is in your inbox before you close the tab. Lead records are sold once and never resold.
FlagshipExclusive turning-65 Medicare lead data. Agents pick a county and a birthday cohort, check out, and their list downloads in seconds.
Verified voter data for campaigns. Build a county voter list, see live counts, and download it instantly.
Likely-homeowner leads for solar, roofing, and HVAC teams that mail, knock, and call.
A free map of Medicare, senior and household data. Zoom from state to county to neighborhood and see the market before you buy it.
Five storefronts host-routed off one deployment. Stripe checkout with idempotent webhook fulfillment, record-level sold-once fingerprinting, programmatic SEO that AI assistants actually cite, and a self-healing enrichment pipeline that grows inventory while I sleep. Every piece self-hosted and owned end to end.
Free tools too: try the ZIP lookup →
Free tools and apps built for the fun of it. The Labs install on your phone, work offline, and keep your data on your device.
desktop · vault · private
A personal memory vault: every photo and video you have kept, as a 3D universe you can fly through. Free for Windows and Mac, and your photos never leave your computer.
maps · 1880s to now · usgs
Type an address and slide from the 1880s to today over historic USGS maps laid on current aerial photos. See your street as the surveyors drew it.
solver · lift, drag · phone
Pocket-sized wing analysis: a real panel-method solver that shows the lift, drag, and pressure of any airfoil, right on your phone.
sky · 9,100 stars · the iss
Point your phone at the sky and see what is up there right now: stars, planets, the Moon, the ISS and bright satellites, with real orbital math on your phone.
canvas · endless · 32 hues
An endless pixel canvas that everyone paints together, with a map that glows where people are and a button that takes you there. Free, in your browser or on your phone.
idle · ten goods · offline
An idle game about a living market: prices move with supply and demand, yours included, and keep moving while you are away. Free, in your browser or on your phone, and it works offline.
overdose · counties · trend
Overdose and care, county by county, for every county in the United States: death rates with a twenty-year trend, prescribing, shortage areas and vulnerability.
access · 53 measures · tract
Health, access and need for six states: conditions, checkups, disability, coverage and the safety net, county to tract.
creators · link · stripe
A free donation page for creators: share your own link and accept one-time or monthly support through Stripe Connect, paid straight to your bank.
simulator · scope · offline
Draw a circuit on your phone and watch it run: a real simulator with diodes, transistors and op-amps, animated current, and a four-channel scope.
Most of my time goes into systems I own and operate. I still take on a handful of client projects a year: websites, dashboards, automations, and data pipelines. If it lives in code, I can build it.
