tool vs tool
Grafana Loki vs Splunk
Cheap-to-store versus powerful-to-search, at opposite ends of the log-management market. Loki indexes only labels and keeps the rest cheaply in object storage — 'Prometheus for logs'; Splunk indexes everything for the most powerful search in the category, at the category's highest price.
| Grafana Loki Grafana Labs | Splunk Splunk (Cisco) | |
|---|---|---|
| Category | Logs | Logs |
| License | Open core | Proprietary |
| Deployment | SaaS or self-hosted | SaaS or self-hosted |
| Monitors | LogsK8sCloud | LogsMetricsTracesServersSecurityCloudK8s |
| Pricing | Free / OSSUsage credits Free tier ✓ | Per GB ingestUsage creditsQuote-only Free tier ✓ |
| Cost | Low Self-host cheap (object storage); Cloud usage-based. | Enterprise Ingest (per GB/day), workload, or entity pricing; ~$1,800-$18,000/yr per 1-10 GB/day. |
| Self-host effort | Moderate | Heavy |
| Maturity | Established | Incumbent |
| Protocols | Syslog | |
| The catch | The label-only index is the whole trade-off — wrong (or high-cardinality) labels make queries crawl or OOM, and full-text search across big time ranges is far weaker than Elasticsearch/Splunk. | Famous for cost blowups — ingest-based pricing means a noisy app or debug-log flood can blow the annual budget, and you index everything you ingest whether you query it or not. |
First-hand data
data as of Jun 24, 2026
Polled first-hand from each vendor's public status page & GitHub. "Significant" excludes informational notices & planned maintenance; incident-minutes sum per-incident durations (not platform downtime). Method & full data →
Which should you pick?
Pick Grafana Loki if…
You want logs that are cheap to keep at volume, your queries are mostly label- and time-scoped, and you're already in the Grafana world — accepting that get-your-labels-right is the price of the low bill.
Full Grafana Loki profile →Pick Splunk if…
You need full-text search over everything, rich analytics, and the app/SIEM ecosystem — and the budget to match. Splunk is the right answer mainly when someone else signs the cheque.
Full Splunk profile →FAQ
Is Grafana Loki cheaper than Splunk?
Substantially, at scale. Loki indexes only labels and stores log content in object storage (S3/GCS), so storage cost is a fraction of an index-everything system like Splunk. The trade-off is search ergonomics: Loki queries are fast when scoped by labels and time, but it is not a full-text search engine the way Splunk is.
What do you give up moving from Splunk to Loki?
Full-text search power and the ecosystem. Splunk’s SPL, apps, and SIEM tooling are deeper than anything in the Loki/Grafana world, and ad-hoc search across unindexed fields is where Splunk shines and Loki struggles. If your investigations rely on arbitrary full-text queries, weigh that against the storage savings before switching.
Built from the monitoring tool database — same facts, everywhere they appear. Last reviewed against vendor sources; pricing drifts, so verify before you sign anything.