Your data, your control
SteelThumb keeps data local and in your hands.
vsClosed systems lock you into their cloud.
Home garden automation from seed to table.
Plan, monitor, water, and grow with tools you own, not another monthly bill.
More food. Less cost. Less time.
For home growers and self-reliant families.
- sprFresh starts every week
- tray4 grow zones
- shdBuilt to last
- potReady for transplant
Not another closed growing appliance.
SteelThumb helps you improve the garden you own with self-hosted software, practical hardware, local data, and no required subscriptions.
No required subscriptions
One-time purchase. No ongoing fees.
vsClosed systems require ongoing payments.
Open and adaptable
Modular, open standards, built to evolve.
vsClosed systems are locked and limited.
Repairable. Upgradeable.
Built with real parts and long-term support.
vsClosed systems cannot be easily repaired.
The SteelThumb Ecosystem
bed
SteelThumb
Garden planning, forecasting, and control
Learn more ->hub
Tendril
Garden monitor and automation hub
Learn more ->Growline
Continuous seed-starting system
Learn more ->tag
PlotTags
Garden labels and localization markers
Learn more ->seed
SeedPort
Coming soon: seed inventory and planting workflow
Learn more ->Tendril field demo
Local-first garden automation, ready for the first public proof run.
Tendril is the SteelThumb garden node for watching plant growth, recording water-level telemetry, capturing timelapses, and controlling a pump only after local safety checks pass.
Physical install status: Pending human, prework completed.
Pictures and timelapses
Hourly captures become a public growth artifact after privacy review.
Water level plus pump control
Reservoir depth gates a bounded pump cycle; unknown state keeps pump power off.
Phone dashboard over Tailscale
The operator checks health, latest image, and telemetry without exposing the controller publicly.
PlotTags
Readable bed and row labels tie photos, notes, and future SeedPort records to real places.
How it works
Plan
Map your garden, plan crops, and forecast with confidence.
Monitor
Track conditions, soil, water, and equipment in real time.
Start
Use Growline to start healthy seedlings on repeat.
Grow
Transplant, maintain, and harvest more through the season.
Local-first
Your data stays close to home.
Grow real food
Tools that support real gardens.
Built to last
Durable hardware. Repairable design.
Privacy first
No selling data. No tracking.
Plan + map
Know your space. Grow with intent.
No required subscriptions
One-time purchase. No ongoing fees.
Software that puts you in control.
SteelThumb software helps you plan, monitor, and automate your garden, all from a system you own and control.
See how it works ->My GardenMapPlanLogsReports
Devices
Tendril Hub Online
Growline Online
Soil Sensor A 30%
Water Level68%
Rain Barrel