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Log Management · head to head

Grafana Loki vs Splunk

Grafana Loki logo

Grafana Loki

Log Management

Log Aggregation for Grafana Stack

From
Free
Rated
-
Full reviewWebsite
Splunk logo

Splunk

Network & Connectivity

Turn Data Into Doing

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Grafana Loki grafana Cloud Logs Pro plan includes only 30-day retention; retention beyond 30 days requires Enterprise plan with minimum $25,000 annual commitment; Splunk no prices are published on any plan; every model requires contacting sales for an estimate
  • They diverge on capability: Grafana Loki covers Label-based indexing, Splunk covers Real-time monitoring.

Where they differ

Only the attributes on which Grafana Loki and Splunk actually diverge.

Attributes where Grafana Loki and Splunk differ
AttributeGrafana LokiSplunk
Pricing modelfreemiumusage-based
PlatformsSelf-hosted (open source), Managed (Grafana Cloud Logs), Enterprise (self-managed with support)Web, Api
CategoryLog ManagementNetwork & Connectivity
Founded20142003

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 Grafana Loki

  • Label-based indexing
  • LogQL language
  • Cost-effective

Only in Splunk

  • Real-time monitoring
  • Data visualization
  • Full-text search
  • Custom dashboards
  • Alert management
  • Anomaly detection
  • Log parsing

Both cover

  • Log aggregation
  • API
  • Webhooks
  • REST
  • Web support
  • Api support

What people use each for

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

Grafana Loki

  • Cost-sensitive organisations deploying Kubernetes and Prometheus ecosystemsnot Splunk
  • Teams needing index-free log aggregation for high-volume environmentsnot Splunk

Splunk

  • Log search and analysis across infrastructurenot Grafana Loki
  • SIEM, SOAR and UEBA for a security operations teamnot Grafana Loki
  • Application performance and infrastructure monitoringnot Grafana Loki
  • Cloud, private cloud or on-premises deploymentnot Grafana Loki

Where each one falls short

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

Grafana Loki

  • Grafana Cloud Logs Pro plan includes only 30-day retention; retention beyond 30 days requires Enterprise plan with minimum $25,000 annual commitment
  • Open-source version requires self-hosting all infrastructure including storage and scaling

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

Grafana Loki

Free

No published plan breakdown. See the Grafana Loki review.

Splunk

Free
  • FreeFree
    • Log aggregation
    • Real-time monitoring
    • Data visualization

Which should you pick?

Choose Grafana Loki if

  • You need label-based indexing.
  • You want to start without paying.
  • You work on Self-hosted (open source), Managed (Grafana Cloud Logs), Enterprise (self-managed with support).
  • You also want logql language.
Grafana Loki review

Choose Splunk if

  • You need real-time monitoring.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want data visualization.
Splunk review

Questions people ask

Is Grafana Loki or Splunk better?
Neither clearly leads. Grafana Loki starts at Free and Splunk at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Grafana Loki or Splunk?
Grafana Loki starts at Free and Splunk at Free.
Does Grafana Loki or Splunk run on more platforms?
Grafana Loki runs on Self-hosted (open source), Managed (Grafana Cloud Logs), Enterprise (self-managed with support). Splunk runs on Web, Api.
Can I use Grafana Loki for free?
Both have a free tier, so you can try either at no cost before committing.
What is Grafana Loki best used for?
Grafana Loki is most often used for cost-sensitive organisations deploying kubernetes and prometheus ecosystems, teams needing index-free log aggregation for high-volume environments. Of those, cost-sensitive organisations deploying kubernetes and prometheus ecosystems and teams needing index-free log aggregation for high-volume environments are not what Splunk is typically brought in for.
What can Grafana Loki do that Splunk cannot?
Grafana Loki covers Label-based indexing, LogQL language, Cost-effective. Splunk covers Real-time monitoring, Data visualization, Full-text search, Custom dashboards. Both handle Log aggregation, API, Webhooks, REST.
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