Softwr

Logging · head to head

Loki vs Mezmo

Loki logo

Loki

Logging

Like Prometheus but for Logs

From
Free
Rated
-
Full reviewWebsite
Mezmo logo

Mezmo

Logging

Composable Observability Platform (LogDNA)

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; Mezmo no pricing tiers or dollar amounts published on pricing page
  • They diverge on capability: Loki covers Label-based indexing, Mezmo covers AI-powered insights.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Loki and Mezmo actually diverge.

Attributes where Loki and Mezmo differ
AttributeLokiMezmo
Pricing modelopen-sourceusage-based

Identical on both: starting price (Free), free tier (Yes), platforms (Web, Api), user rating (Not yet rated), category (Logging), founded (2014).

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 Mezmo

  • AI-powered insights
  • Live tailing
  • Custom 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.

Loki

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

Mezmo

  • Log aggregation and observabilitynot Loki
  • AI-powered root cause analysisnot Loki
  • Telemetry pipeline managementnot 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

Mezmo

  • No pricing tiers or dollar amounts published on pricing page
  • No named plans available to compare
  • Pricing model not transparently disclosed upfront

Pricing, plan by plan

Loki

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

Mezmo

Free
  • FreeFree
    • Log aggregation
    • AI-powered insights
    • Live tailing

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 Mezmo if

  • You need ai-powered insights.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want live tailing.
Mezmo review

Questions people ask

Is Loki or Mezmo better?
Neither clearly leads. Loki starts at Free and Mezmo at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Loki or Mezmo?
Loki starts at Free and Mezmo at Free.
Does Loki or Mezmo 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 Mezmo is typically brought in for.
What can Loki do that Mezmo cannot?
Loki covers Label-based indexing, Real-time log streaming, LogQL query language. Mezmo covers AI-powered insights, Live tailing, Custom parsing. 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
Mezmo: How much does Mezmo cost?

Mezmo uses platform-based pricing tied to data volume and retention rather than per-query charges. The company emphasizes 'no AI surcharges' and 'no pay-per-query surprises,' with pricing scaling based on data volume, but specific dollar amounts and named tiers are not published on their pricing page.

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
Mezmo: Is there a free trial for Mezmo?

Mezmo offers a free trial available at mezmo.com/trial, allowing users to test the platform before purchasing, with pricing scaling predictably as data volume grows.

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
Mezmo: What does Mezmo's platform license include?

All Mezmo plans include telemetry pipeline ingestion, automatic noise reduction for LLM cost efficiency, AI-ready context with event clustering, agentic root cause analysis capabilities, full data control and routing, and role-based access controls, with no extra cost for AI features.

Source
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