Alternatives to Nebula
Certificate-based, open-source overlay mesh network created by Slack
Nebula ranks #8 of 11 in Mesh VPNs, with an Alt Score of 70. It is licensed under MIT, open source with paid hosting and available on Windows, macOS, Linux, iOS and Android. 10 of 12 checklist rows are verified against a public source.
Nebula is an open-source peer-to-peer mesh networking tool originally built and battle-tested internally at Slack before being open-sourced. It uses its own lightweight, certificate-based identity and encryption scheme (not WireGuard) to build encrypted mesh networks across NATs and firewalls at scale, and it is fully self-hostable with no SaaS dependency. A commercial hosted control plane for it is offered separately by Defined Networking.
System administrators and infrastructure teams who want to build and self-host a private overlay network connecting servers, laptops, and mobile devices across clouds, datacenters, and NATs without managing their own PKI by hand.
An open-source, certificate-authenticated overlay networking tool with built-in firewall-style access rules (Nebula security groups), UDP hole punching for NAT traversal, optional routing of external subnets or a default route through a gateway host (unsafe_routes), and an experimental DNS resolver served from lighthouse nodes for name-based host lookup.
Each host runs the nebula binary with a certificate signed by a self-hosted certificate authority (via the nebula-cert tool) that asserts its overlay IP, name, and group memberships; one or more lighthouse nodes with routable IPs let peers discover each other and establish direct, mutually authenticated tunnels using the Noise Protocol Framework, falling back to relays when direct connectivity isn't possible.
Why people leave Nebula
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Ranked alternatives
Ordered by Alt Score. Click any score to see the breakdown.
Firezone is an open-source, self-hostable remote access platform built on WireGuard that creates direct, encrypted peer connections between users and internal resources through lightweight gateways.
Headscale is an open-source coordination/control server that is API-compatible with the official Tailscale client apps, letting teams self-host their own control plane while keeping the same mobile an.
OpenZiti is an open-source, programmable zero-trust networking platform stewarded by NetFoundry that builds an overlay fabric of routers and identities instead of exposing listening ports on hosts.
Defguard is an open-source, Rust-built WireGuard VPN manager that adds multi-factor authentication, an identity/SSO gateway, and a web UI for managing peers, gateways, and access policies.
innernet is an open-source tool built by Tonari that wraps raw WireGuard to automate peer key exchange and IP address allocation for private mesh networks, similar in goal to Nebula and early Tailscal.
Feature comparison
Rows come from the Mesh VPNs checklist (16 rows). Human-verified cells only. ? means the value has not been verified.
| Mesh VPNs checklist | Nebula | NetBird | ZeroTier | Firezone | Headscale | Netmaker |
|---|---|---|---|---|---|---|
| Pricing model | ||||||
| Starts at | ||||||
| License | ||||||
| Platforms | ||||||
| WireGuard-based | ||||||
| Self-hostable control plane | ||||||
| NAT traversal | ||||||
| Exit nodes | ||||||
| ACLs / access rules | ||||||
| SSO integration | ||||||
| Device limit (free tier) | ||||||
| MagicDNS-style naming | ||||||
| Subnet routing | ||||||
| Open source clients | ||||||
| Audit published | ||||||
| Mobile support |
Every fact and feature listed for Nebula is verified against its own pages. Each alternative is sourced on its own page.
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License MIT verified 2026-07-30
MIT License
https://raw.githubusercontent.com/slackhq/nebula/master/LICENSE -
Platforms Windows, macOS, Linux, iOS, Android verified 2026-07-30
Nebula is portable, and runs on Linux, OSX, Windows, iOS, and Android.
https://raw.githubusercontent.com/slackhq/nebula/master/README.md -
Pricing model OSS + paid hosting verified 2026-07-30
Nebula itself is free, self-hosted, MIT-licensed software. Defined Networking is a separate company selling managed hosting built on Nebula; its own pricing is not sourced here since defined.net is ou
Managed Nebula from Defined Networking handles all of this for you.
https://raw.githubusercontent.com/slackhq/nebula/master/README.md -
Status active verified 2026-07-30
Labels Release v1.11.0 (dated 2026-07-23 per the release page timestamp) as the current release, one week before this research was conducted.
Latest
https://github.com/slackhq/nebula/releases -
WireGuard-based No verified 2026-07-30
Uses its own protocol built on the Noise Protocol Framework, not WireGuard.
Nebula is a mutually authenticated peer-to-peer software-defined network based on the Noise Protocol Framework.
https://raw.githubusercontent.com/slackhq/nebula/master/README.md -
Self-hostable control plane Yes verified 2026-07-30
Running a lighthouse requires very few compute resources, and you can easily use the least expensive option from a cloud hosting provider.
https://raw.githubusercontent.com/slackhq/nebula/master/README.md -
NAT traversal Yes verified 2026-07-30
Discovery nodes (aka lighthouses) allow individual peers to find each other and optionally use UDP hole punching to establish connections from behind most firewalls or NATs.
https://raw.githubusercontent.com/slackhq/nebula/master/README.md -
Exit nodes Yes verified 2026-07-30
Achieved via the unsafe_routes feature routing a 0.0.0.0/0 default route through a gateway host, rather than a dedicated 'exit node' toggle.
it supports 0.0.0.0/0 unsafe_routes, allowing for more precise routing decisions based on the packet tags
https://raw.githubusercontent.com/slackhq/nebula/master/examples/config.yml -
ACLs / access rules Yes verified 2026-07-30
Nebula security group configuration
https://raw.githubusercontent.com/slackhq/nebula/master/examples/config.yml -
SSO integration No verified 2026-07-30
OSS Nebula authenticates hosts via self-issued certificates, not centralized SSO. The separate commercial Defined Networking product advertises desktop SSO for certificate issuance, but that is a dist
Nebula uses certificates to assert a node's IP address, name, and membership within user-defined groups.
https://raw.githubusercontent.com/slackhq/nebula/master/README.md -
MagicDNS-style naming Yes verified 2026-07-30
Lighthouse DNS dynamically resolves nebula hostnames, comparable to MagicDNS-style naming in other mesh VPNs.
serve_dns optionally starts a dns listener that responds to various queries and can even be delegated to for resolution
https://raw.githubusercontent.com/slackhq/nebula/master/examples/config.yml -
Subnet routing Yes verified 2026-07-30
Unsafe routes allows you to route traffic over nebula to non-nebula nodes
https://raw.githubusercontent.com/slackhq/nebula/master/examples/config.yml -
Open source clients Yes verified 2026-07-30
Desktop/server client is this same MIT-licensed repo; the mobile app source is published in a separate DefinedNet/mobile_nebula repo linked directly from the official README.
Mobile ([source code](https://github.com/DefinedNet/mobile_nebula))
https://raw.githubusercontent.com/slackhq/nebula/master/README.md -
Mobile support Yes verified 2026-07-30
Nebula is portable, and runs on Linux, OSX, Windows, iOS, and Android.
https://raw.githubusercontent.com/slackhq/nebula/master/README.md
FAQ
Yes. ZeroTier, Firezone and Headscale have a free tier or are fully free. Free-tier limits in the comparison table are verified and dated.
NetBird, ZeroTier and Firezone — every license claim links its source.