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Logging · head to head

Loki vs Sematext

Loki logo

Loki

Logging

Like Prometheus but for Logs

From
Free
Rated
-
Full reviewWebsite
Sematext logo

Sematext

Logging

Full Stack Observability Platform

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Loki the Grafana Cloud free tier caps log ingestion at 50 GB a month with 14 day retention; Sematext the $5 Basic plan caps ingestion at 500 MB a day and retains logs for 7 days
  • They diverge on capability: Loki covers Label-based indexing, Sematext covers APM.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Loki and Sematext actually diverge.

Attributes where Loki and Sematext differ
AttributeLokiSematext
Pricing modelopen-sourceusage-based
Founded20142007

Identical on both: starting price (Free), free tier (Yes), platforms (Web, Api), user rating (Not yet rated), category (Logging).

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 Loki

  • Label-based indexing
  • Real-time log streaming
  • LogQL query language

Only in Sematext

  • APM
  • Metrics monitoring
  • Anomaly detection

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.

Loki

  • Aggregating application and infrastructure logs with label based indexingnot Sematext
  • Querying logs alongside metrics in Grafananot Sematext

Sematext

  • Centralised log management and search across servicesnot Loki
  • Infrastructure and application monitoring alongside logsnot Loki

Where each one falls short

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

Loki

  • The Grafana Cloud free tier caps log ingestion at 50 GB a month with 14 day retention
  • Paid log pricing is split across three separate meters, at $0.050 per GB processed, $0.400 per GB written and $0.100 per GB retained
  • Retaining logs is billed separately from ingesting them, so keeping data costs on an ongoing basis rather than once
  • The Pro plan carries a $19 a month platform fee before any usage charges

Sematext

  • The $5 Basic plan caps ingestion at 500 MB a day and retains logs for 7 days
  • Ingestion and storage are billed on separate meters, at $0.10 per GB received and $0.15 per GB stored
  • Retention is a plan property rather than a setting, so keeping logs longer means moving tier
  • The published pricing page renders Standard and Pro figures from unresolved template placeholders, so only the Basic numbers are actually readable

Pricing, plan by plan

Loki

Free
  • FreeFree
    • Log aggregation
    • Label-based indexing
    • Real-time log streaming

Sematext

Free
  • FreeFree
    • Log aggregation
    • APM
    • Metrics monitoring

Which should you pick?

Choose Loki if

  • You need label-based indexing.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want real-time log streaming.
Loki review

Choose Sematext if

  • You need apm.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want metrics monitoring.
Sematext review

Questions people ask

Is Loki or Sematext better?
Neither clearly leads. Loki starts at Free and Sematext at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Loki or Sematext?
Loki starts at Free and Sematext at Free.
Does Loki or Sematext run on more platforms?
Both run on Web, Api, so platform support will not decide this one for you.
Can I use Loki for free?
Both have a free tier, so you can try either at no cost before committing.
What is Loki best used for?
Loki is most often used for aggregating application and infrastructure logs with label based indexing, querying logs alongside metrics in grafana. Of those, aggregating application and infrastructure logs with label based indexing and querying logs alongside metrics in grafana are not what Sematext is typically brought in for.
What can Loki do that Sematext cannot?
Loki covers Label-based indexing, Real-time log streaming, LogQL query language. Sematext covers APM, Metrics monitoring, Anomaly detection. Both handle Log aggregation, API, Webhooks, REST.

Answered from the vendors’ own pages

Loki: What does it cost to use Grafana Loki?

Loki is open source and free under the AGPLv3 license for self-hosted deployments. Grafana's managed Cloud Logs service includes a free tier up to 50GB of logs at no cost.

Source
Sematext: How much does Sematext cost?

Sematext uses a transparent usage-based pricing model. Customers can set a Max Daily Volume for automatic rejection of excess data to prevent unexpected charges and keep costs predictable. Specific tier pricing is available through their cost calculator tool.

Source
Loki: Are there paid options for Loki beyond the free tier?

Yes. Grafana Cloud Logs offers paid tiers for teams and enterprises, and Enterprise Logs provides self-managed options with expert support for organizations with data localization or privacy requirements.

Source
Sematext: How does Sematext's pricing compare to competitors?

Sematext is positioned as +3x cheaper than Datadog, with potential annual savings of $800,000 for customers logging more than 200TB/month and a reported 75% decrease in price per GB compared to alternatives.

Source
Loki: What license does open source Loki use?

Loki is released under the AGPLv3 license, which requires you to share modifications and publish your source code if you deploy modifications publicly.

Source
Sematext: Does Sematext offer a free trial?

Yes, Sematext offers a 14-day free trial with no credit card required, allowing you to test the platform before committing to a paid plan.

Source
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