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Networking · head to head

Nebula vs OpenWrt

Nebula logo

Nebula

Networking

Certificate based overlay network from Slack, with identity and firewall rules carried in the certificate

From
Free
Rated
-
Full reviewWebsite
OpenWrt logo

OpenWrt

Operating Systems

Linux firmware replacement for routers and embedded network devices, with a package manager and writable filesystem

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Nebula the open source project has no user interface, no enrolment workflow and no revocation service, so certificate issuing, distribution and expiry become scripts you write and then have to keep working.; OpenWrt support is per device and per hardware revision, so a model number that worked last year may point at a different chipset this year and be unsupported.
  • They diverge on capability: Nebula covers Certificate carried identity, OpenWrt covers Package manager.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Nebula and OpenWrt actually diverge.

Attributes where Nebula and OpenWrt differ
AttributeNebulaOpenWrt
PlatformsLinux, macOS, Windows, iOS, Android, FreeBSDRouters, Access points, x86-64, ARM, MIPS, Embedded gateways
CategoryNetworkingOperating Systems

Identical on both: starting price (Free), pricing model (Open source, no licence fee), 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 Nebula

  • Certificate carried identity
  • Group based host firewall
  • Lighthouse discovery
  • Noise protocol encryption
  • Unsafe routes
  • Managed option

Only in OpenWrt

  • Package manager
  • LuCI web interface
  • Traffic shaping
  • VPN and DNS
  • VLAN and multi-network
  • OpenWrt One

What people use each for

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

Nebula

  • Flattening a network across several clouds and datacentres without VPC peering or route tablesnot OpenWrt
  • Very large fleets where a central policy service on the connection path is unacceptablenot OpenWrt
  • Environments that already run an internal certificate authority and want the network to use itnot OpenWrt
  • Replacing per host iptables rules with policy written against roles that follow the hostnot OpenWrt

OpenWrt

  • Extending the useful life of an ISP-supplied router that has stopped receiving security updatesnot Nebula
  • Separating guest, IoT and work devices onto VLANs on hardware that does not offer it nativelynot Nebula
  • Running WireGuard, ad blocking or DNS over TLS at the edge rather than configuring every clientnot Nebula
  • Building small industrial or retail gateways where a full Linux distribution is too heavynot Nebula

Where each one falls short

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

Nebula

  • The open source project has no user interface, no enrolment workflow and no revocation service, so certificate issuing, distribution and expiry become scripts you write and then have to keep working.
  • Revoking a compromised host means distributing a blocklist entry to every other host and reloading them, which is a fleet wide operation rather than a click, and easy to get wrong under pressure.
  • Changing a host group membership means reissuing and redeploying its certificate, so policy changes are a deployment rather than a configuration edit.
  • There is no identity provider integration or single sign on in the open source version, so it maps well to servers and badly to a fleet of user laptops.
  • NAT traversal is best effort and hosts behind symmetric NAT need a relay configured deliberately, so connectivity failures show up as intermittent rather than immediate and are awkward to diagnose.

OpenWrt

  • Support is per device and per hardware revision, so a model number that worked last year may point at a different chipset this year and be unsupported.
  • Flashing can brick a device permanently, and on hardware without a serial console or a recovery bootloader there is no way back.
  • Devices with 4MB or 8MB of flash have been dropped from recent releases, so a lot of older hardware is stuck on unsupported versions with known vulnerabilities.
  • Hardware acceleration for NAT and routing depends on vendor drivers, and enabling traffic shaping frequently cuts a gigabit connection to a fraction of its rated throughput.
  • A sysupgrade keeps your configuration but not your installed packages, so every release upgrade is followed by reinstalling and reconfiguring add-ons by hand.

Pricing, plan by plan

Nebula

Free
  • NebulaFree
    • Full functionality under the MIT licence
    • No host limit
    • You operate the certificate authority and lighthouses
  • Defined Networking$undefined/month
    • Hosted control plane and enrolment
    • Managed certificate lifecycle and revocation
    • Policy and DNS interface

OpenWrt

Free
  • OpenWrtFree
    • No licence fee for any device count
    • All packages from the official feeds
    • Community support via forum and wiki

Which should you pick?

Choose Nebula if

  • You need certificate carried identity.
  • You want to start without paying.
  • You work on Linux, macOS, Windows, iOS, Android, FreeBSD.
  • You also want group based host firewall.
Nebula review

Choose OpenWrt if

  • You need package manager.
  • You want to start without paying.
  • You work on Routers, Access points, x86-64, ARM, MIPS, Embedded gateways.
  • You also want luci web interface.
OpenWrt review

Questions people ask

Is Nebula or OpenWrt better?
Neither clearly leads. Nebula starts at Free and OpenWrt at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Nebula or OpenWrt?
Nebula starts at Free and OpenWrt at Free.
Does Nebula or OpenWrt run on more platforms?
Nebula runs on Linux, macOS, Windows, iOS, Android, FreeBSD. OpenWrt runs on Routers, Access points, x86-64, ARM, MIPS, Embedded gateways.
Can I use Nebula for free?
Both have a free tier, so you can try either at no cost before committing.
What is Nebula best used for?
Nebula is most often used for flattening a network across several clouds and datacentres without vpc peering or route tables, very large fleets where a central policy service on the connection path is unacceptable, environments that already run an internal certificate authority and want the network to use it, replacing per host iptables rules with policy written against roles that follow the host. Of those, flattening a network across several clouds and datacentres without vpc peering or route tables and very large fleets where a central policy service on the connection path is unacceptable are not what OpenWrt is typically brought in for.
What can Nebula do that OpenWrt cannot?
Nebula covers Certificate carried identity, Group based host firewall, Lighthouse discovery, Noise protocol encryption. OpenWrt covers Package manager, LuCI web interface, Traffic shaping, VPN and DNS.

Answered from the vendors’ own pages

Nebula: Does it use WireGuard?

No. Nebula predates the common WireGuard mesh tools and uses the Noise protocol framework with its own certificate format.

OpenWrt: How do I know my router is supported?

Check the Table of Hardware for your exact model and revision before buying or flashing. Do not assume that a supported model number means a supported unit; manufacturers change chipsets within a model.

Nebula: Can I run it without Defined Networking?

Yes, entirely. Defined Networking sells the control plane conveniences, not the network itself.

OpenWrt: Is the OpenWrt One worth buying over a used router?

If you are evaluating OpenWrt rather than rescuing hardware you own, yes. It is supported by definition, has an unbrickable boot arrangement, and part of the price funds the project.

Nebula: How do I revoke a host?

Add its certificate fingerprint to the blocklist in the configuration of the other hosts and reload them. There is no online revocation check.

OpenWrt: Will flashing void my warranty?

Almost always, and it may also break the ISP remote management your provider relies on for support. Keep the stock firmware image before you start.

Nebula: Is it a good fit for laptops?

Less so than the identity provider based tools. There is no single sign on, so every laptop needs a certificate issued and renewed by whatever process you build.

OpenWrt: Is opkg still the package manager?

It is in the current stable releases, but development has moved towards apk, so expect package tooling and command syntax to change at the next major release.

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