Willow
Willow: A command-focused voice interface for DIY smart homes, not a general conversational assistant. Ranked #16 of 19 in AI Voice Assistants by our editors (6.6/10); pricing: Free plan; best for DIY smart-home users prioritizing local commands.
At a glance
- Editor score6.6 / 10
- PricingFree plan
- Best forDIY smart-home users prioritizing local commands
- Free planYes
- Paid fromFree
- Smart-home controlYes
- Facts checked24 Sep 2026
Where it wins
- Recognizes up to 400 configured commands on-device.
- Routes commands to Home Assistant, openHAB, or REST endpoints.
- Includes audio processing with echo cancellation and noise suppression.
Where it doesn't
- Device configuration requires a separate Willow Application Server.
- Compatible ESP32-S3-BOX hardware is purchased separately.
- Its command-focused feature set does not provide conversation memory.
Our verdict on Willow
Willow is an open-source voice-assistant platform designed primarily for ESP32-S3-BOX hardware. It suits people configuring a voice interface for smart-home control, especially those who want to route commands to Home Assistant, openHAB, or REST endpoints. Wake-word detection and voice activity detection help determine when to listen and when speech has ended. Willow can recognize configured commands on-device, or send audio to a Willow Inference Server for transcription. It is a focused fit for custom smart-home control rather than a turnkey general-purpose assistant.
Its command workflow is the defining strength. On-device recognition supports up to 400 commands, while recognized text can be routed to Home Assistant, openHAB, or generic REST/HTTP endpoints. Audio processing includes automatic gain control, echo cancellation, and noise suppression. Optional LCD and touchscreen interfaces are available on the ESP32-S3-BOX-3. This routing and command recognition make Willow relevant to users building custom actions around an existing smart-home setup; they do not make it a conversational assistant. The published feature set does not include conversation memory or web search.
Setup involves more than choosing commands: Willow requires a separate Application Server for device configuration, and users can self-host the Inference Server for speech transcription. Compatible hardware is separate from the free software. Willow's self-hosted approach and focused feature set will appeal to technically inclined users who want a configurable voice control layer and can manage its components. People seeking a turnkey Echo or Google Home replacement, mobile or desktop apps, or a general conversational assistant should look elsewhere.
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Willow pricing
Willow fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Mobile apps | No |
| Desktop apps | No |
| Smart-home control | Yes |
| Custom actions | Yes |
| Web search | No |
| Conversation memory | None |
| Deployment | Self-hosted, Cloud, Browser extension |
| Platforms | Web |
| Support | Community, Docs |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 3 integrations: Home Assistant, openHAB, Generic REST APIs |
| Pricing | Free plan |
| Website | heywillow.io |
| Facts checked | 24 Sep 2026 |
Willow integrations
Willow lists 3 integrations on its own site.
- Home Assistant
- openHAB
- Generic REST APIs
Alternatives to Willow
- GeminiA connected assistant for voice, research, files, and Google apps across devices.9.2
- BixbyA free, Galaxy-focused assistant for device control, routines, reminders and SmartThings.8.5
- Meta AIFree voice chat with web search, file analysis and access across Meta apps.8.4
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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