Networking · head to head
Nebula vs Splunk
Nebula
Networking
Certificate based overlay network from Slack, with identity and firewall rules carried in the certificate
- From
- Free
- Rated
- -
The short version
- Only Nebula has a free tier, so it costs nothing to try first.
- 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.; Splunk no prices are published on any plan; every model requires contacting sales for an estimate
- They diverge on capability: Nebula covers Certificate carried identity, Splunk covers Log aggregation.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Nebula and Splunk actually diverge.
Identical on both: user rating (Not yet rated), category (Networking).
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 Splunk
- Log aggregation
- Real-time monitoring
- Data visualization
- Full-text search
- Custom dashboards
- Alert management
- Anomaly detection
- Log parsing
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 Splunk
- Very large fleets where a central policy service on the connection path is unacceptablenot Splunk
- Environments that already run an internal certificate authority and want the network to use itnot Splunk
- Replacing per host iptables rules with policy written against roles that follow the hostnot Splunk
Splunk
- Log search and analysis across infrastructurenot Nebula
- SIEM, SOAR and UEBA for a security operations teamnot Nebula
- Application performance and infrastructure monitoringnot Nebula
- Cloud, private cloud or on-premises deploymentnot 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.
Splunk
- No prices are published on any plan; every model requires contacting sales for an estimate
- Three separate pricing models, workload, ingest and entity, so the same deployment costs different amounts depending on which was signed
- Ingest pricing bills on data volume, so cost tracks how much you log rather than how much value you get from it
- Security, observability and platform are priced separately
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
Splunk
On request- Observability Cloud - Infrastructure$15/month
- Infrastructure monitoring for per host/month pricing
- Unlimited users and ability to scale to petabytes of data
- Observability Cloud - App & Infra$60/month
- App and infrastructure monitoring for per host/month pricing billed annually
- Observability Cloud - End-to-End$75/month
- End-to-end observability for per host/month pricing billed annually
- On-Call$5/month
- On-call management for per user per month pricing billed annually
- Covers up to 10 seats
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.
Choose Splunk if
- You need log aggregation.
- You work on Web, Api.
- You also want real-time monitoring.
Questions people ask
- Is Nebula or Splunk better?
- Neither clearly leads. Nebula starts at Free and Splunk at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Nebula or Splunk?
- Nebula has a free tier; the other does not. Paid plans start at Free for Nebula and On request for Splunk.
- Does Nebula or Splunk run on more platforms?
- Nebula runs on Linux, macOS, Windows, iOS, Android, FreeBSD. Splunk runs on Web, Api.
- Can I use Nebula for free?
- Yes. Nebula has a free tier, so you can try it without paying. Splunk starts at On request.
- 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 Splunk is typically brought in for.
- What can Nebula do that Splunk cannot?
- Nebula covers Certificate carried identity, Group based host firewall, Lighthouse discovery, Noise protocol encryption. Splunk covers Log aggregation, Real-time monitoring, Data visualization, Full-text search.
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.
Splunk: What is Splunk's pricing model?
Splunk offers activity-based, ingest, or workload pricing options depending on the product. Splunk Observability Cloud and AppDynamics use per-host or per-vCPU monthly pricing billed annually. Splunk Cloud Platform and Splunk Enterprise require custom quotes from sales.
SourceNebula: Can I run it without Defined Networking?
Yes, entirely. Defined Networking sells the control plane conveniences, not the network itself.
Splunk: How much does Splunk Enterprise cost?
Splunk Enterprise pricing requires contact with sales. The vendor offers data-ingest or workload pricing options, supports unlimited users, and can scale to petabytes of data, but specific rates are not published online.
SourceNebula: 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.
Splunk: What are the differences between Splunk's pricing options?
Splunk offers multiple pricing models: ingest-based pricing charges according to data volume brought into the system; workload-based pricing charges based on computing resources consumed by workloads. Both models apply to Splunk Enterprise and Splunk Cloud Platform. Standard support is included with product purchases; premium support is available as an add-on.
SourceNebula: 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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