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ESPHome vs OpenVPN

ESPHome logo

ESPHome

Smart Home

Custom firmware for ESP8266/ESP32 smart home devices

From
Free
Rated
-
Full reviewWebsite
OpenVPN logo

OpenVPN

Networking

Open source VPN protocol with a commercial Access Server product priced per simultaneous connection

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: ESPHome eSPHome runs only on supported microcontrollers; the project recommends ESP32, ESP32-S3, ESP32-C3 and ESP32-C6 and advises against ESP8266 for new projects; OpenVPN open source OpenVPN, while free, requires real technical skill to configure, secure and maintain without the Access Server admin layer
  • They diverge on capability: ESPHome covers YAML Configuration, OpenVPN covers Open source core.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which ESPHome and OpenVPN actually diverge.

Attributes where ESPHome and OpenVPN differ
AttributeESPHomeOpenVPN
Pricing modelopen-sourceOpen source core is free; Access Server billed per simultaneous connection
PlatformsESP8266, ESP32, Docker, Raspberry PiLinux, Windows, macOS, iOS, Android
CategorySmart HomeNetworking
Founded2018Unknown

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in ESPHome

  • YAML Configuration
  • OTA Updates
  • Home Assistant Native
  • Custom Components
  • Home Assistant
  • MQTT
  • API
  • Native integration

Only in OpenVPN

  • Open source core
  • Access Server admin UI
  • Per-connection licensing
  • Free tier
  • Cross-platform clients

What people use each for

The jobs each tool is most often brought in to do.

ESPHome

  • Building custom smart home sensors and switches on ESP32 hardwarenot OpenVPN
  • Replacing vendor cloud firmware on ESP based devices with locally controlled firmwarenot OpenVPN
  • Integrating DIY devices into Home Assistant over a native API or MQTTnot OpenVPN

OpenVPN

  • A technical team wanting a fully free, self-configured VPN server using the open source protocol without any vendor relationshipnot ESPHome
  • A small business wanting a supported, easier-to-administer VPN server, willing to pay per concurrent connection rather than per employeenot ESPHome
  • An organisation with more staff than typical concurrent VPN usage, since Access Server bills only active simultaneous connections, not total accountsnot ESPHome
  • An IoT or large-scale deployment needing custom Enterprise pricing above 2,000 connectionsnot ESPHome

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

ESPHome

  • ESPHome runs only on supported microcontrollers; the project recommends ESP32, ESP32-S3, ESP32-C3 and ESP32-C6 and advises against ESP8266 for new projects
  • Support for ESP32-H2, RP2040 and other newer chips is documented as less mature
  • Large displays and some sensors do not work well on ESP8266 because of its limited RAM, which is roughly a fifth of an ESP32

OpenVPN

  • Open source OpenVPN, while free, requires real technical skill to configure, secure and maintain without the Access Server admin layer
  • Per-connection billing on Access Server means usage spikes, such as an all-hands remote day, can push simultaneous connections over a licensed limit and block new connections until usage drops or the plan is upgraded
  • OpenVPN's traditional hub-and-spoke architecture routes traffic through a central server, unlike mesh VPN tools like Tailscale or NetBird that establish direct peer-to-peer connections where possible, which can add latency
  • Client configuration and certificate management for the open source version is more manual and error-prone than newer VPN tools with zero-config onboarding
  • Access Server pricing above the Growth tier reverts to custom Enterprise quoting, so very large deployments lose the pricing transparency of the lower tiers
  • The protocol's throughput is generally lower than newer kernel-integrated protocols like WireGuard under equivalent conditions, which matters for high-bandwidth use cases

Pricing, plan by plan

ESPHome

Free
  • CommunityFree
    • Full firmware
    • Home Assistant integration
    • Custom sensors

OpenVPN

Free
  • Access Server FreeFree
    • Up to 2 simultaneous connections
    • All features included
  • Access Server Growth$7/month
    • Per simultaneous connection beyond the free tier
    • Annual billing
  • Access Server Enterprise/IoT$undefined/month
    • Custom pricing for 2,000+ connections

Which should you pick?

Choose ESPHome if

  • You need yaml configuration.
  • You want to start without paying.
  • You work on ESP8266, ESP32, Docker, Raspberry Pi.
  • You also want ota updates.
ESPHome review

Choose OpenVPN if

  • You need open source core.
  • You want to start without paying.
  • You work on Linux, Windows, macOS, iOS, Android.
  • You also want access server admin ui.
OpenVPN review

Questions people ask

Is ESPHome or OpenVPN better?
Neither clearly leads. ESPHome starts at Free and OpenVPN at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ESPHome or OpenVPN?
ESPHome starts at Free and OpenVPN at Free.
Does ESPHome or OpenVPN run on more platforms?
ESPHome runs on ESP8266, ESP32, Docker, Raspberry Pi. OpenVPN runs on Linux, Windows, macOS, iOS, Android.
Can I use ESPHome for free?
Both have a free tier, so you can try either at no cost before committing.
What is ESPHome best used for?
ESPHome is most often used for building custom smart home sensors and switches on esp32 hardware, replacing vendor cloud firmware on esp based devices with locally controlled firmware, integrating diy devices into home assistant over a native api or mqtt. Of those, building custom smart home sensors and switches on esp32 hardware and replacing vendor cloud firmware on esp based devices with locally controlled firmware are not what OpenVPN is typically brought in for.
What can ESPHome do that OpenVPN cannot?
ESPHome covers YAML Configuration, OTA Updates, Home Assistant Native, Custom Components. OpenVPN covers Open source core, Access Server admin UI, Per-connection licensing, Free tier.

Answered from the vendors’ own pages

ESPHome: Is ESPHome free to use?

Yes. ESPHome is free and open-source software. The Desktop App, Device Builder, components, and recipe tools are all available at no cost.

Source
OpenVPN: Is OpenVPN free?

The open source protocol and software are free under the GPL; Access Server, the commercial packaged product, charges per simultaneous connection beyond a free 2-connection tier.

ESPHome: What is the cost to run ESPHome?

ESPHome software itself is completely free. Hardware devices and components used with ESPHome vary in cost depending on which microcontrollers and IoT devices you choose.

Source
OpenVPN: What counts as a connection for billing purposes?

A simultaneously active connected device, not a registered user account or total device count; unlimited accounts and devices can be created but only the licensed number can be connected at once.

ESPHome: Does ESPHome require a subscription or license fee?

No. ESPHome is open-source software with no subscription fees, license costs, or commercial restrictions associated with its use.

Source
OpenVPN: How does OpenVPN compare with WireGuard-based tools like Tailscale?

OpenVPN uses a traditional hub-and-spoke VPN architecture rather than the mesh, peer-to-peer approach used by newer tools like Tailscale or NetBird.

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