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Software · head to head

Langfuse vs Logto

L

Langfuse

Software

Simple pricing for projects of all sizes

From
On request
Rated
-
Full reviewWebsite
Logto logo

Logto

Software

Open-source identity and authentication infrastructure for apps and APIs

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Logto has a free tier, so it costs nothing to try first.
  • Each has a real cost: Langfuse billing is metered per unit, where a unit is any trace, observation, or score sent to the platform; the free Hobby tier includes only 50,000 units per month before graduated per-unit charges apply, as of August 2026.; Logto advanced features like RBAC, organizations, MFA, and enterprise SSO are billed as separate paid add-ons rather than included in Pro.

Where they differ

Only the attributes on which Langfuse and Logto actually diverge.

Attributes where Langfuse and Logto differ
AttributeLangfuseLogto
Starting priceOn requestFree
Pricing modelusage-basedfreemium
Free tierNoYes
PlatformsWebweb, api

Identical on both: user rating (Not yet rated), category (Unknown).

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 Langfuse

Nothing recorded that Logto does not also cover.

Only in Logto

  • Prebuilt sign-in UI
  • Social connectors
  • Role-based access control
  • Multi-factor authentication
  • Machine-to-machine apps
  • Audit logs

What people use each for

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

Langfuse

No use cases recorded yet. See the Langfuse review.

Logto

  • Adding sign-in to a new SaaS productnot Langfuse
  • Implementing SSO for B2B customersnot Langfuse
  • Securing internal APIs with M2M tokensnot Langfuse
  • Adding RBAC and organizations to a multi-tenant appnot Langfuse

Where each one falls short

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

Langfuse

  • Billing is metered per unit, where a unit is any trace, observation, or score sent to the platform; the free Hobby tier includes only 50,000 units per month before graduated per-unit charges apply, as of August 2026.

Logto

  • Advanced features like RBAC, organizations, MFA, and enterprise SSO are billed as separate paid add-ons rather than included in Pro.
  • Enterprise pricing is not published and requires contacting sales.
  • Token-based billing can make cost forecasting harder than flat per-MAU pricing for high-traffic apps.

Pricing, plan by plan

Langfuse

On request

No published plan breakdown. See the Langfuse review.

Logto

Free
  • FreeFree
    • Up to 50,000 MAU
    • 50K tokens included
    • 3 applications
  • Pro$24/month
    • Unlimited MAU and applications
    • 3 included API resources
    • Passkey sign-in

Which should you pick?

Choose Langfuse if

Nothing in the data separates Langfuse from Logto on the points above - pick on price and on how each one feels to use.

Langfuse review

Choose Logto if

  • You need prebuilt sign-in ui.
  • You want to start without paying.
  • You work on web, api.
  • You also want social connectors.
Logto review

Questions people ask

Is Langfuse or Logto better?
Neither clearly leads. Langfuse starts at On request and Logto at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Langfuse or Logto?
Logto has a free tier; the other does not. Paid plans start at On request for Langfuse and Free for Logto.
Does Langfuse or Logto run on more platforms?
Langfuse runs on Web. Logto runs on web, api.
Can I use Logto for free?
Yes. Logto has a free tier, so you can try it without paying. Langfuse starts at On request.
What can Langfuse do that Logto cannot?
Logto covers Prebuilt sign-in UI, Social connectors, Role-based access control, Multi-factor authentication.

Answered from the vendors’ own pages

Logto: What does Logto cost?

Logto offers a Free plan at $0/month, a Pro plan starting at $24/month with 50K free tokens included, and a custom-priced Enterprise plan. Extra add-ons like RBAC or MFA are billed separately on Pro.

Source
Logto: Is there a free plan, and what are its limits?

Yes. The Free plan supports up to 50,000 monthly active users, 3 total applications, 1 machine-to-machine app, 3 social connectors, 1 webhook, and 3-day audit log retention.

Source
Logto: How is usage metered?

Logto uses token-based billing: only access tokens issued for authentication and authorization activity are counted, rather than charging purely per MAU.

Source
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