Terrestream vs AirGradient ONE

Manufacturer page checked September 12, 2026. AirGradient positions AirGradient ONE as an indoor air-quality monitor with open-source orientation and smart-home relevance. Its current product page lists 11 RGB LEDs, local/self-hosted data flexibility, and a $230 assembled price; Home Assistant documents a built-in local-polling integration. AirGradient also lists 12 months of hosted dashboard/API access with purchase.

Where AirGradient fits. AirGradient ONE belongs on the shortlist for buyers who prioritize open hardware culture, Home Assistant workflows, and a direct sensor-first approach.

Where Terrestream differs. Terrestream is built as a residential product and evidence system: twelve signals, outdoor context, source-pattern interpretation, primary-source component documentation, and plain-English recommendations.

Factual distinction. AirGradient is the open-home comparison point. Terrestream focuses on a more finished buyer experience, source explanations, and a measurement-evidence story designed for residential and commercial conversations.