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Comparison · 4 picks
Alexa vs Google vs Siri vs HA Assist 2026
Until 2024, the voice-assistant comparison was a three-way: Alexa, Google, Siri. By 2026 it's properly a four-way, because Home Assistant Assist - paired with a local LLM running on a £150 Mini PC - is now a credible privacy-first alternative to the big-cloud assistants. This comparison covers smart-home device coverage, general-knowledge accuracy, privacy posture, and integration breadth across all four.
At a glance
All 4 options side by side.
| Amazon Alexa (Echo) | Google Assistant (Nest Hub) | Apple Siri (HomePod) | Home Assistant Assist + Ollama | |
|---|---|---|---|---|
| Price | £50 | £100 | £100 | £150 |
| Best for | Still the broadest smart-home device support, the most polished setup experience, and the lowest-friction recommendation if family members are sharing the assistant. | Best for general-knowledge questions (closest to GPT-4 level depth thanks to the Gemini-powered upgrade), strong smart-home support, native deep integration with Google services (Calendar, Maps, Photos, YouTube Music). | The right Apple-ecosystem pick - on-device processing for many commands, HomePod's audio is genuinely good for music, the privacy story is the cleanest of the cloud assistants. | you own operations + setup time. |
The picks in detail
Amazon Alexa (Echo)
Bottom line. Still the broadest smart-home device support, the most polished setup experience, and the lowest-friction recommendation if family members are sharing the assistant. Privacy posture is the weakest of the four (audio uploaded to AWS, retention controls partial).
Google Assistant (Nest Hub)
Bottom line. Best for general-knowledge questions (closest to GPT-4 level depth thanks to the Gemini-powered upgrade), strong smart-home support, native deep integration with Google services (Calendar, Maps, Photos, YouTube Music). Privacy roughly equivalent to Alexa.
Apple Siri (HomePod)
Bottom line. The right Apple-ecosystem pick - on-device processing for many commands, HomePod's audio is genuinely good for music, the privacy story is the cleanest of the cloud assistants. Smart-home device support is HomeKit/Matter-centric (narrower than Alexa/Google but covers all major brands now).
Home Assistant Assist + Ollama
Bottom line. Best for privacy and offline-resilience. Pair a Home Assistant Voice Preview Edition puck or ESPHome satellite with a local LLM (Llama 3.1 8B or fixt/home-3b-v3 via Ollama) running on a Mini PC. 2-4 second latency on the mid-tier hardware, completely cloud-free. Trade-off: you own operations + setup time.
Which has the best smart-home device support?
Alexa wins on raw device count - 130,000+ certified products as of late 2024, plus deep Routines-builder for multi-device flows. Most smart-home brands ship Alexa support as the default integration. Google Assistant is a close second - 50,000+ certified devices and strong fan-out via Routines. Apple Siri traditionally lagged but Matter changed that: any Matter-1.0+ device pairs with HomeKit, and from 2026 onward HomeKit's device pool effectively matches the others for new purchases. Home Assistant Assist doesn't have a 'certified device' concept - it operates on whichever Home Assistant entities exist, so it implicitly supports everything Home Assistant supports (the largest integration list in the smart-home world, ~3,000+ integrations). The catch: HA Assist requires you have those integrations set up; Alexa and Google can pair some brands directly without any hub.
Which is most accurate for general-knowledge questions?
Google Assistant on Gemini is the clear winner here in 2026 - the Nest Hub series benefited materially from the Gemini upgrade, and ChatGPT-level depth is now the baseline. Alexa with the Alexa+ Generative AI tier closes the gap considerably (we have a separate Alexa+ review on this), but it's behind Google's Gemini on knowledge depth. Siri remains weaker on open-ended knowledge despite the iOS 18 Apple Intelligence upgrades. Home Assistant Assist with a 3-8 billion parameter local LLM is notably weaker than any of the cloud options on general knowledge - this is a real trade-off, not a marketing footnote.
Which has the strongest privacy posture?
Local HA Assist beats them all - audio never leaves your LAN, no cloud processing, no vendor analytics. Siri is the strongest of the cloud assistants: on-device processing for many commands, Private Cloud Compute architecture for the rest, and Apple's general privacy posture. Google and Amazon both upload audio to vendor servers for processing, store transcripts with retention controls that the user can adjust but not fully audit, and have documented use of audio for model training (opt-in by default in some markets, opt-out in others - check current consent settings).
Which integrates best with the rest of your tech stack?
Pick based on what you already use:
- Apple Music, iCloud Calendar, Find My, HomeKit: Siri integrates natively.
- Spotify, YouTube Music, Audible, Amazon Music, Amazon Shopping: Alexa wins on shopping; the music story is roughly equivalent across all three.
- Google Calendar, Gmail, Google Photos, YouTube, Google Maps: Google Assistant integrates natively.
- Home Assistant entities and any local services: HA Assist wins because it shares the same entity model as your dashboards and automations.
Should you mix multiple voice assistants?
Yes, more often than people realise. Many home-automation enthusiasts run HA Assist inside the house for smart-home control (because the latency and privacy are right for that use case) and keep one HomePod mini or Echo for general-knowledge queries and music. The wake words are distinct, so there's no conflict, and you get the best of each.
The pattern that doesn't work: trying to have one assistant manage all your smart-home devices when those devices are scattered across HomeKit, Alexa-exclusive, and Google-exclusive ecosystems. In that case you typically need to use Home Assistant as a hub layer that bridges everything, then expose the result through whichever assistant you prefer.