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Networking · head to head

Nebula vs RudderStack

Nebula logo

Nebula

Networking

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

From
Free
Rated
-
Full reviewWebsite
RudderStack logo

RudderStack

Automation Integration

The open-source customer data platform

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.; RudderStack on the free plan data processing stops after a second consecutive overage rather than being billed, so exceeding 250,000 events twice breaks the pipeline
  • They diverge on capability: Nebula covers Certificate carried identity, RudderStack covers Data collection.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Nebula and RudderStack actually diverge.

Attributes where Nebula and RudderStack differ
AttributeNebulaRudderStack
Pricing modelOpen source, no licence feefreemium
PlatformsLinux, macOS, Windows, iOS, Android, FreeBSDWeb, Self-hosted
CategoryNetworkingAutomation Integration
FoundedUnknown2018

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 Nebula

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

Only in RudderStack

  • Data collection
  • Event tracking
  • Audience segmentation
  • Warehouse ingestion
  • Real-time sync
  • Data transformation
  • Privacy controls
  • 200+ destinations

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 RudderStack
  • Very large fleets where a central policy service on the connection path is unacceptablenot RudderStack
  • Environments that already run an internal certificate authority and want the network to use itnot RudderStack
  • Replacing per host iptables rules with policy written against roles that follow the hostnot RudderStack

RudderStack

  • Collecting event data from apps and websites and routing it to warehouses and toolsnot Nebula
  • Building a warehouse first customer data pipelinenot 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.

RudderStack

  • On the free plan data processing stops after a second consecutive overage rather than being billed, so exceeding 250,000 events twice breaks the pipeline
  • The free plan allows 250,000 events a month
  • Growth starts at $265 a month for 1 million events, with volume sold in tiers up to 25 million
  • Overage is charged as the gap to the next tier's price rather than per event, so a small excess costs a full tier step

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

RudderStack

Free
  • FreeFree
    • 250K events per month
    • 16 SDK sources
    • 200+ cloud destinations
  • Growth$265/month
    • 1 million events per month (up to 25 million available)
    • Unlimited team members
    • Tracking plans
  • Enterprise$null/mo
    • 5-minute warehouse sync
    • Unlimited transformations
    • Access to Profiles & Data Apps

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 RudderStack if

  • You need data collection.
  • You want to start without paying.
  • You work on Web, Self-hosted.
  • You also want event tracking.
RudderStack review

Questions people ask

Is Nebula or RudderStack better?
Neither clearly leads. Nebula starts at Free and RudderStack at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Nebula or RudderStack?
Nebula starts at Free and RudderStack at Free.
Does Nebula or RudderStack run on more platforms?
Nebula runs on Linux, macOS, Windows, iOS, Android, FreeBSD. RudderStack runs on Web, Self-hosted.
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 RudderStack is typically brought in for.
What can Nebula do that RudderStack cannot?
Nebula covers Certificate carried identity, Group based host firewall, Lighthouse discovery, Noise protocol encryption. RudderStack covers Data collection, Event tracking, Audience segmentation, Warehouse ingestion.

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.

RudderStack: What is RudderStack's free plan limit?

RudderStack's free plan includes 250K events per month with 16 SDK sources, 200+ cloud destinations, warehouse destinations, and Reverse ETL at no cost.

Source
Nebula: Can I run it without Defined Networking?

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

RudderStack: How much does RudderStack Growth plan cost?

RudderStack Growth plan costs $265 per month with annual billing discount available, providing 1 million events per month (up to 25 million available), unlimited team members, and 2 workspaces.

Source
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.

RudderStack: What happens if I exceed my RudderStack event limit?

On the free plan, data processing stops after your second consecutive overage. Paid plan customers face overage fees calculated as the difference between the next tier's pricing and their current plan.

Source
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.

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