Product Library / Indoor Air & Comfort

Research profile · last verified 2026-10-03

Levoit OasisMist 450S Smart Humidifier

Compiled by SmartHomeWorkflow Research · Levoit · Indoor Air & Comfort · ~$89.99 (Price at time of research, never treated as a live price: $89.99 on Levoit's own US store on 29 September 2026, in stock and shown as the regular price with no offer against it. The previous $79.97 was a limited-time offer the same store ran in August 2026, so a lower price may come and go.)

Compatibility at a glance

Does it work with your platform?

Choose your platform to see its setup and functions. Your choice carries across product pages.

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[2][4][15][18]
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A connection can work while individual controls or automations remain unconfirmed. Read the connection details ↓

Protocols: WIFI[2]

Before you buy

What do you need to make it work?

No hub for the device alone

Choose a platform above for its connection. A hub can be optional for the device itself and required for a platform or automation.

No hub, and there is none to buy. The humidifier joins your home Wi-Fi and is set up in the VeSync app, with your phone's Bluetooth used only during setup. Levoit's manual says you must be on a secure 2.4 GHz Wi-Fi network during setup; it does not list which bands the radio supports, so plan for a 2.4 GHz network and do not count on more.[2]

One device can provide more than one role. These are setup requirements, not a shopping list of separate purchases.

What could you do with this?

Put its functions to use.

Research, not hands-on testing

Start with a documented control or event. The selected connection shows what is confirmed for that platform.

Documented device function

On/off

The device supports this control.

Compare its platform availability in the table below.

Setup and sources

Device documentation: [2] [3] [15] [17] [18]

Documented device function

Humidity reading

The device reports this event.

Compare its platform availability in the table below.

Setup and sources

Device documentation: [2] [3] [15] [17] [18]

A documented control or event is one part of a setup. It does not by itself establish a complete automation.

The functions, side by side

What can you use, and where?[2][3][15][17][18]

A platform connection does not confirm every function. Controls and reported events are shown separately from what an automation can use.

Controls
1 documented
Reported events
1 documented

Compare all five platforms. On a narrow screen, scroll the table sideways.

Documented device functions, platform controls and automation availability
Device functionApple HomeInconclusive[2][4][15]Google HomeWorks[2][4][15][18]AlexaWorks[2][4][13][15][18]SmartThingsInconclusive[2][4][15]Home AssistantInconclusive[3][12][20]
On/offDevice control
Control

Inconclusive

Control

Not stated

Control

Not stated

Control

Inconclusive

Control

Inconclusive

Humidity readingReported event
Event

Inconclusive

Event

Not stated

Event

Not stated

Event

Inconclusive

Event

Inconclusive

Automation availability for this model is not established.

✓ Documented for this connection. × A stated limit. ◐ A partial function. ? Not established. A listed device function does not establish a complete routine, its other equipment or any plan requirements.

Setup and sources

Apple Home

Unknown. Apple Home, HomeKit and Siri appear nowhere on Levoit's page for this machine, and its manual names only Alexa and Google Assistant. A list of voice assistants says nothing about whether a device appears in the Home app, so this stays open rather than reading as a no. Neither Levoit nor VeSync holds any Matter certification, so there is no Matter route for this machine to inherit.[2][4][15]

Google Home

Works through VeSync's link to Google Assistant, on the same footing as Alexa. Levoit's manual for this model names Google Assistant beside Alexa, connected from the VeSync app, for voice commands. It names no specific commands, so mist level and target humidity by voice are not stated. The link runs through VeSync's servers and needs your own VeSync account rather than the app's guest account.[2][4][15][18]

Alexa

Works through VeSync's link to Alexa. Levoit's manual for this model says you can use the VeSync app to connect the humidifier to Amazon Alexa, following the steps in the app to link VeSync to your voice assistant, and lists Alexa under voice commands. Levoit names no specific commands, so whether you can set the mist level or a target humidity by voice is not stated. The product page itself only says 'third-party voice assistants through VeSync'. The link runs through VeSync's servers and needs your own VeSync account: the manual says third-party services do not work with a guest account.[2][4][13][15][18]

SmartThings

Unknown. SmartThings appears nowhere on Levoit's page or in its manual for this machine, and no Samsung page naming this model was found. The manual names Alexa and Google Assistant as the voice assistants VeSync connects to; that is a list of voice assistants, not of smart-home platforms, so it settles nothing about SmartThings either way.[2][4][15]

Home Assistant

Unknown, and the most carefully weighed cell on the record, because Home Assistant's documentation is detailed and specific and does not name this machine. Home Assistant's official VeSync integration is real, actively maintained, and covers Levoit, Etekcity and Cosori devices on one VeSync account, with a dedicated humidifier section for humidity readings, target humidity, mist level and warm mist. Its supported-humidifier list then names exactly four models: Classic200S, Classic300S, OasisMist 1000S and Superior6000S. The 450S is not among them, while its sibling in the same line is, by model number. A list that names a stablemate and omits this one is the strongest evidence available, and it is still not conclusive, because the page says so itself: 'This list may not be exhaustive as devices have multiple model numbers within this.' The integration also works through your VeSync account rather than pairing model by model. So the honest reading is that this machine may well work and nobody has published that it does. Recorded unknown rather than partial (no source says it works) and rather than 'no' (an incomplete community list is not a maker's platform list, which is our bar for a negative).[3][12][20]

Platform documentation:

levoit.com · checked 2026-09-29

vesync.com · checked 2026-08-06

levoit.com · checked 2026-10-03

home-assistant.io · checked 2026-10-03

Device documentation: [2] [3] [15] [17] [18]

Listed device functions are established from vendor documentation. An ability missing here is unestablished, not necessarily absent.

Connection details and setup sources
EcosystemSupportThe catch
Amazon AlexaWorksWorks with this ecosystem[2][4][13][15][18]Works through VeSync's link to Alexa. Levoit's manual for this model says you can use the VeSync app to connect the humidifier to Amazon Alexa, following the steps in the app to link VeSync to your voice assistant, and lists Alexa under voice commands. Levoit names no specific commands, so whether you can set the mist level or a target humidity by voice is not stated. The product page itself only says 'third-party voice assistants through VeSync'. The link runs through VeSync's servers and needs your own VeSync account: the manual says third-party services do not work with a guest account.
Google HomeWorksWorks with this ecosystem[2][4][15][18]Works through VeSync's link to Google Assistant, on the same footing as Alexa. Levoit's manual for this model names Google Assistant beside Alexa, connected from the VeSync app, for voice commands. It names no specific commands, so mist level and target humidity by voice are not stated. The link runs through VeSync's servers and needs your own VeSync account rather than the app's guest account.
Apple HomeInconclusiveWe researched this and the evidence doesn't settle it — the catch explains why[2][4][15]Unknown. Apple Home, HomeKit and Siri appear nowhere on Levoit's page for this machine, and its manual names only Alexa and Google Assistant. A list of voice assistants says nothing about whether a device appears in the Home app, so this stays open rather than reading as a no. Neither Levoit nor VeSync holds any Matter certification, so there is no Matter route for this machine to inherit.
SmartThingsInconclusiveWe researched this and the evidence doesn't settle it — the catch explains why[2][4][15]Unknown. SmartThings appears nowhere on Levoit's page or in its manual for this machine, and no Samsung page naming this model was found. The manual names Alexa and Google Assistant as the voice assistants VeSync connects to; that is a list of voice assistants, not of smart-home platforms, so it settles nothing about SmartThings either way.
Home AssistantInconclusiveWe researched this and the evidence doesn't settle it — the catch explains why[3][12][20]Unknown, and the most carefully weighed cell on the record, because Home Assistant's documentation is detailed and specific and does not name this machine. Home Assistant's official VeSync integration is real, actively maintained, and covers Levoit, Etekcity and Cosori devices on one VeSync account, with a dedicated humidifier section for humidity readings, target humidity, mist level and warm mist. Its supported-humidifier list then names exactly four models: Classic200S, Classic300S, OasisMist 1000S and Superior6000S. The 450S is not among them, while its sibling in the same line is, by model number. A list that names a stablemate and omits this one is the strongest evidence available, and it is still not conclusive, because the page says so itself: 'This list may not be exhaustive as devices have multiple model numbers within this.' The integration also works through your VeSync account rather than pairing model by model. So the honest reading is that this machine may well work and nobody has published that it does. Recorded unknown rather than partial (no source says it works) and rather than 'no' (an incomplete community list is not a maker's platform list, which is our bar for a negative).

? Inconclusive means we researched that ecosystem and the evidence doesn’t settle it — the catch says why, and the sources are listed below. It is a statement about the available evidence, never a verdict on the product. A Setup Check researches your exact setup where the official sources don’t answer.

Plans and ongoing costs[2][15][17]

✓ Works without a subscription: Yes.

Vendor account required: Inconclusive — we read the vendor's own setup material and it does not say either way. Treat it as unanswered rather than as a no.

No subscription, and unusually the maker says so in its own words rather than merely omitting one: Levoit describes control 'with the free VeSync app' on the product page. No plan page, premium tier or gated feature appears anywhere we read. The recurring costs are physical: the box ships three aroma pads, three absorption pads and two water filter sponges, and replacements are parts Levoit sells separately.

Maintenance and offline use[2][3]

The catch

Levoit names two voice assistants for this humidifier, and only in its manual. The product page's only platform sentence is 'Connect to third-party voice assistants through VeSync for hands-free control when your hands are full', with no names attached. The manual for this model fills the gap: you can use the VeSync app to connect it to Amazon Alexa or Google Assistant, through your own VeSync account. It names no specific commands, so whether you can change the mist level or set a target humidity by voice is not stated. Apple Home and SmartThings are named nowhere. Second, Home Assistant: its official VeSync integration documents humidifiers well (target humidity, mist level, warm mist, humidity readings), and its supported list names four Levoit humidifiers, including this machine's line-mate the OasisMist 1000S, and not the 450S. Home Assistant says the list may not be exhaustive, so it may work and nobody has said so. Third, remote and voice control depend on VeSync's servers, with no local route and no Matter; the buttons on the unit run every mode. Fourth, Levoit does not list the Wi-Fi bands, only that setup needs a 2.4 GHz network. As an appliance it is well specified: a 4.5 L tank, up to 45 hours on low, warm and cool mist, two 360° nozzles, top-fill, an aroma pad, a two-year warranty, and an app the maker itself calls free.

Who it's for

Someone buying primarily on the appliance: warm and cool mist in one machine is uncommon at this price, and a 4.5 L tank running up to 45 hours on low covers a bedroom for the better part of two days. It suits an Alexa or Google household happy to link a VeSync account for voice control, and an existing VeSync household; if you already own a Levoit purifier, an Etekcity plug or a Cosori fryer, this joins the same free app. Think carefully if you want to change settings by voice, since Levoit does not say which commands Alexa or Google accept, or if you use Apple Home or SmartThings, which Levoit does not name at all. Home Assistant users face an open question: the official VeSync integration handles humidifiers and lists this machine's line-mate but not the 450S. Anyone who wants remote control to keep working when a maker's servers do not should note that no local route is published.

Check availability at Levoit

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Sources & method

Numbered sources below back the facts marked with the matching number above. This is a research profile: compiled from manufacturer documentation, certification registries, and published testing — we state facts, not verdicts, and we have not physically tested this unit. How we work →

22 numbered sources· read them in the source's own words
  1. [1] Levoit US store, OasisMist 450S product record — Read on the maker's own site, verified 2026-08-06
    Backs: Product identity, Price, Market availability
  2. [2] Levoit US store, OasisMist 450S product page — Read on the maker's own site, verified 2026-08-06
    Backs: Product identity, Price, Protocols, Batteries, Works without the internet, Subscription, Required hub or bridge, Power source, Installation, Capabilities, Amazon Alexa compatibility, Google Home compatibility, Apple Home compatibility, SmartThings compatibility, Service status, Research status
  3. [3] Home Assistant, VeSync integration documentation — Read what the other company publishes, verified 2026-08-06
    Backs: Home Assistant compatibility, Batteries, Works without the internet, Capabilities
  4. [4] VeSync, corporate site — Read on the maker's own site, verified 2026-08-06
    Backs: Amazon Alexa compatibility, Google Home compatibility, Apple Home compatibility, SmartThings compatibility
  5. [5] levoit.com OasisMist product page, vesync.com, and the cited home-assistant.io vesync integration, re-read 2026-08-18 — Read on the maker's own site, verified 2026-08-18
  6. [6] Record-keeping entry: the migrated research stamp was replaced by the read that actually established this record, 2026-08-30, verified 2026-08-30
  7. [7] the record's own customer-facing prose fields as they stood before 2026-09-05 (no new external read), verified 2026-09-05
  8. [8] https://levoit.com/products/oasismist-smart-humidifier (read 2026-09-10). The page's app section links https://apps.apple.com/us/app/vesync/id1289575311 and https://play.google.com/store/apps/details?id=com.etekcity.vesyncplatform beside 'Smart Control: Control settings, create schedules, view real-time humidity levels, and more with the free VeSync app.' Two stores named by the maker is what separates this from a page that only says an app exists. — Read on the maker's own site, verified 2026-09-10
    Backs: App platforms
  9. [9] https://levoit.com/products/oasismist-smart-humidifier (read 2026-09-10) publishes a specification block — 'Power Supply : AC 120V, 60Hz' among it — and names no Wi-Fi band anywhere on the page. The Wi-Fi band stays unrecorded: we looked, and Levoit does not publish it. — Read on the maker's own site, verified 2026-09-10
  10. [10] Plugs into a wall outlet — nothing to wire or mount., verified 2026-09-16
    Backs: Installation
  11. [11] this record's own lifecycle note as it stood before 2026-09-18 (no new external read): its wording was rewritten so it reads in plain language. No fact, date, source or value changed, and the earlier wording is kept on this record., verified 2026-09-18
  12. [12] Home Assistant's VeSync integration documentation, www.home-assistant.io/integrations/vesync/, re-read 2026-09-19. The supported-humidifier list still names four models and not this one: 'Classic200S: Classic 200S Smart Ultrasonic Cool Mist Humidifier, Classic300S: Classic 300S Ultrasonic Smart Humidifier, OasisMist 1000S Smart Ultrasonic Cool Mist Tower Humidifier (LUH-M101S-WUS), Superior6000S: Superior 6000S Smart Evaporative Humidifier'. The page states of its own lists, verbatim: 'This list may not be exhaustive as devices have multiple model numbers within this.' — Read what the other company publishes, verified 2026-09-19
    Backs: Home Assistant compatibility
  13. [13] Levoit's OasisMist 450S product page, read again 2026-09-20. The "Voice Control" panel still reads, word for word: "Connect to third-party voice assistants through VeSync for hands-free control when your hands are full." Alexa, Google, Apple, Siri, SmartThings, Home Assistant and Matter each appear zero times on the page. — Read the original source directly, verified 2026-09-20
    Backs: Amazon Alexa compatibility
  14. [14] Levoit's own store listing for the OasisMist 450S, read 2026-09-23. The listing is titled "Levoit OasisMist® 450S Smart Humidifier", is sold by Levoit, and sells a single version: part code HEAPHULVSUS0049, barcode 810043375542. — Read on the maker's own site, verified 2026-09-23
    Backs: Certification and product IDs
  15. [15] Levoit's US OasisMist 450S page, read in full on 2026-09-29, structured route first. Structured listing: title 'Levoit OasisMist® 450S Smart Humidifier', one variant 'Default Title', SKU HEAPHULVSUS0049, barcode 810043375542, price 8999, compare_at_price 8999, available true. Page, verbatim: "Regular price $89.99" · "Free Shipping 2-Year Limited Warranty 30-Day Money Back Guarantee" · "Smart Control: Control settings, create schedules, view real-time humidity levels, and more with the free VeSync app." · "Power Supply : AC 120V, 60Hz Rated Power : 280W Water Tank Capacity : 1.19 gal / 4.5 L Max Runtime : Up to 45 hours on low mist setting Effective Range : 215–430 ft² / 20–40 m² Noise Level : Lowest: Dimensions : 10.8 x 6.0 x 11.97 in" · "Voice Control Connect to third-party voice assistants through VeSync for hands-free control when your hands are full." — Read the original source directly, verified 2026-09-29
    Backs: Product identity, Certification and product IDs, Price, Market availability, Service status, Subscription, Power source, Batteries, Capabilities, Amazon Alexa compatibility, Google Home compatibility, Apple Home compatibility, SmartThings compatibility, Research status
  16. [16] Levoit's store data for the OasisMist 450S page, read in full on 2026-10-03. Title "Levoit OasisMist® 450S Smart Humidifier", vendor "Levoit", type "Humidifier", "price":8999, "compare_at_price":8999, "available":true; one variant "Default Title", SKU "HEAPHULVSUS0049", barcode "810043375542", price 8999, compare-at 8999, available; nothing is sold on a plan. — Read the original source directly, verified 2026-10-03
    Backs: Product identity, Certification and product IDs, Price, Market availability
  17. [17] Levoit's US OasisMist 450S page, read in full on 2026-10-03 (plain read, and a rendered read with tabs opened the same day showing the same panels). Verbatim: "Regular price $89.99" · "Free Shipping 2-Year Limited Warranty 30-Day Money Back Guarantee" · "Smart Control: Control settings, create schedules, view real-time humidity levels, and more with the free VeSync app." · "Power Supply : AC 120V, 60Hz Rated Power : 280W Water Tank Capacity : 1.19 gal / 4.5 L Max Runtime : Up to 45 hours on low mist setting Effective Range : 215–430 ft² / 20–40 m² Noise Level : Lowest: Dimensions : 10.8 x 6.0 x 11.97 in / 27.4 x 15.2 x 30.4 cm Weight : 5.3 lb / 2.4 kg" · "User Manuals Manual Download (US)" · "Voice Control Connect to third-party voice assistants through VeSync for hands-free control when your hands are full." The page names no voice assistant, no smart-home platform and no plan. — Read the original source directly, verified 2026-10-03
    Backs: Product identity, Price, Subscription, Power source, Installation, Batteries, Capabilities, App platforms, Service status, Research status
  18. [18] Levoit's user manual for the OasisMist Smart Humidifier, model LUH-O451S-WUS, linked from the product page as 'Manual Download (US)', read in full on 2026-10-03 (back-cover code "A0-01.00_S 22C30 US"). Verbatim: "Model: LUH-O451S-WUS" · "Note: You must create your own VeSync account to use third-party services and products. These will not work with a guest account." · "You can use the VeSync app to connect your smart humidifier to Amazon Alexa or Google Assistant™. Follow the in-app instructions to connect VeSync to your voice assistant." · under 'VeSync App Functions': "Remote Control From Your Phone • Turn the humidifier on/off." · "Monitor Humidity Levels • Check current humidity levels in the humidifier’s environment." · "Third-Party Voice Control • Compatible with Amazon Alexa and Google Assistant™ for voice commands." · "During the setup process, you must be on a secure 2.4GHz Wi-Fi network." · "Your phone must have Location turned on while your phone is connecting to your smart humidifier. This is required to establish the Bluetooth® connection." · specifications "Max Cool Mist Output 300 mL/h", "Max Warm Mist Output 550 mL/h", "Noise Level Lowest: < 26dB (Low Cool Mist) Highest: < 41dB (High Warm Mist)". Apple, HomeKit, Siri, SmartThings, Home Assistant and Matter do not appear. — Read the original source directly, verified 2026-10-03
    Backs: Product identity, Amazon Alexa compatibility, Google Home compatibility, Capabilities, Power source
  19. [19] Levoit's OasisMist 450S manual, read in full on 2026-10-03. Verbatim: "Note: You can also use the VeSync app to control these functions, as well as additional app-only features" (the Controls page, which documents an on/off, mist level, warm mist, Auto Mode and Sleep Mode button on the unit) · "The humidifier will remember your settings for Mist Level, Warm Mist, and Wi-Fi settings when turned off or unplugged" · "Note: Power outages, internet outages, or changing Wi-Fi routers may cause your humidifier to go offline." · "2. Open the VeSync app. If you already have an account, tap Log In. To create a new account, tap Sign Up." · "Note: You must create your own VeSync account to use third-party services and products. These will not work with a guest account." — Read the original source directly, verified 2026-10-03
  20. [20] Home Assistant's VeSync integration page (documentation 2026.9.4), read in full on 2026-10-03. The humidifier list still reads "Classic200S: Classic 200S Smart Ultrasonic Cool Mist Humidifier Classic300S: Classic 300S Ultrasonic Smart Humidifier OasisMist 1000S Smart Ultrasonic Cool Mist Tower Humidifier (LUH-M101S-WUS) Superior6000S: Superior 6000S Smart Evaporative Humidifier", beside "This list may not be exhaustive as devices have multiple model numbers within this." and "Its IoT class is Cloud Polling." — Read the platform's own documentation, verified 2026-10-03
    Backs: Home Assistant compatibility
  21. [21] VeSync's corporate landing page, read in full on 2026-10-03 (1,292 characters of text). It describes the family of brands, "Our family of brands, Etekcity, Cosori, Levoit, and Pawsync, is united and powered by the VeSync smart home app.", and names no voice assistant or smart-home platform. — Read the original source directly, verified 2026-10-03
  22. [22] This record's own entries for the pages that name the route., verified 2026-10-03

Compatibility and lifecycle information reflects the last-verified date above and can change without notice (firmware updates, cloud-service changes, discontinuations). It is provided as-is, for information — verify with the manufacturer before purchasing. Spot an error? Tell us and we'll fix it. Full terms: Terms of Service.

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