The controls-system alternative for under-$50k SMB cultivation operations. Plug in a Raspberry Pi, wire your sensors with our 80+ part library, deploy in minutes — monitor humidity, run edge PID loops, automate temperature and lighting from one dashboard. No integrator, no PLC, no cloud round-trips on the control loop.
Free tier — no credit card. Bring your own Pi or buy ours.
Six named apps, each one tuned for a single common cultivation problem. Pick the one that maps to your top fear or your biggest monthly task — you can layer the others later from the same dashboard.
Pick this if a room temperature or humidity drift can ruin a crop.
Threshold + drift alerts on every sensor in a room. SMS + email when humidity is outside the recipe band for longer than the dwell window. Universal across mushroom rooms, microgreens, cannabis, and lab grows.
Start with Catch a Drifting RoomPick this if a stuck valve or a tripped breaker is your top-5 incident type.
Duty-cycle tracking and "should-be-running-but-isn't" detection on every actuator. Surfaces stuck relays, missed runtimes, and ramp-time creep before they cascade.
Start with Maintenance WatcherPick this if your operation runs batches against a written setpoint timeline.
Stage-by-stage setpoint progression (e.g., flower week 1 → week 6, mash → boil → ferment). One dashboard runs the recipe; alerts fire on any deviation.
Start with Recipe RunnerPick this if you owe an inspector a temperature log every month.
One-click monthly CSV / PDF rollup of every sensor in scope, pre-signed for HACCP / FSMA / USDA-grade audits. Emails itself to your records address on day-1 of the next month.
Start with Compliance CSV ExportPick this if a tank running dry or overflowing is on your list of fears.
Level + flow sensor monitoring with hysteresis, dose-pump duty cap, and overflow alerts. Built for hydroponic reservoirs, brewery liquor tanks, and microgreens flood trays.
Start with Tank / Reservoir WatchdogPick this if a lighting schedule slip costs you a flowering cycle.
Photoperiod schedule visualization for every lighting channel — actual-vs-target overlay, missed-trigger detection, sunrise/sunset offset for greenhouse supplement lighting.
Start with Photoperiod SentinelFrom sensor to automation in minutes
Product demo video
Watch on YouTube →Real-time telemetry from every sensor on a single screen.
Trend charts with synchronized LTTB downsampling.
Threshold alerts, schedules, and conditional logic.
From unboxing to automation in minutes
Plug in your Raspberry Pi and scan the QR code in the app. Your device appears on the dashboard in seconds.
Build your automation visually in the Configurator. Wire up sensors, actuators, and PID controllers with drag-and-drop.
Push your flow to the Pi with one click. Changes are live in moments — no SSH, no terminal required.
Watch your data live from any device. Set alerts, tune setpoints, and control actuators from anywhere in the world.
Get actionable data that will help grow your business
Real-time data and process control are essential for any manufacturer to maximize productivity and efficiency. LoopString makes industrial-grade automation accessible — without the capital costs of traditional PLC systems. Monitor, control, and optimize your processes from anywhere, on any device.
10+Years of process control and automation experience behind the platform.
$0Free tier to start — no credit card, no PLC integrator quote required.
23Project templates for grow rooms, greenhouses, breweries, mushroom farms, and more.
24/7Edge-first PID keeps your processes controlled even if the cloud is unreachable.
See It in Action
Everything you need to monitor, control, and automate
Monitor every sensor, actuator, and controller from a single pane of glass. Room-based organization, live sparklines, and instant status indicators keep you in control.
Dive deep into your process data with multi-signal charts, configurable time ranges, and CSV export. Track trends, spot anomalies, and make data-driven decisions.
Design automation flows visually with our drag-and-drop configurator. Connect sensors to controllers to actuators — no code required.
Manage all your devices from one dashboard. Monitor health, track deployments, and scale from one controller to hundreds.
Pricing that scales with your automation needs
From hobby projects to full-scale operations. No PLC costs, no engineering consultants.
Connect your first Pi and see live sensor data. Full platform for one device.
Best for: Trying us out, hobby builds, single-room evaluation
$0/mo
No credit card required
Scheduled automation and remote access for personal IoT and small grows.
Best for: Single grow tents, home fermentation, hobby smoke + HVAC
$9/mo
PID loops, analytics, and flow versioning for serious makers and small operators.
Best for: Mushroom fruiting chambers, nano-breweries, single-room cultivators
$29/mo
Multi-room production with team sharing, conditional logic, and device health monitoring.
Best for: Multi-room grow rooms, craft brewers, single-site cold storage, small food production
$109/mo
Multi-location grouping, fleet management, and compliance reporting for full-scale operations.
Best for: Licensed cultivators, multi-location food producers, regional HVAC fleets
$249/mo
Dedicated infrastructure, SLA, custom integrations, and audit-grade reporting.
Best for: Commercial cannabis at scale, food-production chains, regulated industries
Custom
| Feature | Free | Hobby | Maker | Pro | Business | Enterprise |
|---|---|---|---|---|---|---|
| Devices | 1 | 2 | 5 | 15 | 50 | Unlimited |
| Sensor Slots | 8 | 20 | 60 | 200 | 500 | Unlimited |
| Data Retention | 24h | 30 days | 90 days | 1 year | 2 years | Unlimited |
| Dashboard | ||||||
| Basic Sensors | ||||||
| Time-based Scheduling | ||||||
| Sensor Calibration | ||||||
| PID Control | ||||||
| Analytics | ||||||
| Dashboard Sharing | ||||||
| Conditional Logic | ||||||
| Multi-Location Grouping | ||||||
| Compliance Reports (HACCP/FDA/USDA) | ||||||
| Priority Support | ||||||
| Custom Integrations |
Early adopter access
We're working hand-in-hand with the first grow rooms, breweries, and food producers running LoopString in production — refining the Configurator, expanding the parts library, and shipping fixes the same week they're reported. We'd rather earn real testimonials than seed fake ones. Want a free Pi setup, three months of Pro, and a direct line to engineering in exchange for honest feedback and a case study?
Limited early-adopter slots — we want to be hands-on with each one.
Leave us your contact information and any questions you may have and we will get back to you shortly.
