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Flagsmith vs Langfuse

Flagsmith logo

Flagsmith

Software

Open-source feature flag and remote config platform

From
Free
Rated
-
Full reviewWebsite
L

Langfuse

Software

Simple pricing for projects of all sizes

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Flagsmith has a free tier, so it costs nothing to try first.
  • Each has a real cost: Flagsmith the Free plan supports only a single team member, limiting collaboration for small teams.; 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.

Where they differ

Only the attributes on which Flagsmith and Langfuse actually diverge.

Attributes where Flagsmith and Langfuse differ
AttributeFlagsmithLangfuse
Starting priceFreeOn request
Pricing modelfreemiumusage-based
Free tierYesNo
Platformsweb, apiWeb

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 Flagsmith

  • Feature flags
  • Segments
  • A/B testing
  • Scheduled flags
  • SDKs
  • SAML/SSO

Only in Langfuse

Nothing recorded that Flagsmith does not also cover.

What people use each for

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

Flagsmith

  • Gradual feature rollouts across environmentsnot Langfuse
  • Remote configuration without redeploying codenot Langfuse
  • Running A/B tests tied to feature flagsnot Langfuse
  • Self-hosting feature flags for data residency requirementsnot Langfuse

Langfuse

No use cases recorded yet. See the Langfuse review.

Where each one falls short

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

Flagsmith

  • The Free plan supports only a single team member, limiting collaboration for small teams.
  • Exceeding request limits triggers overage charges after a one-time 30-day grace period.
  • Enterprise-grade SSO and governance are locked behind the Scale-Up and Enterprise tiers.
  • Self-hosting requires operating and updating the platform yourself, unlike a fully managed SaaS competitor.

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.

Pricing, plan by plan

Flagsmith

Free
  • FreeFree
    • Up to 50,000 requests/month
    • 1 team member
    • Unlimited feature flags, environments, identities and segments
  • Start-Up$45/month
    • Up to 1,000,000 requests/month
    • 3 team members
    • Scheduled flags, 2FA, A/B testing, integrations, email support
  • Scale-Up$300/month
    • 5,000,000+ requests/month
    • 5-20 team members
    • SAML/SSO, governance features, priority support

Langfuse

On request

No published plan breakdown. See the Langfuse review.

Which should you pick?

Choose Flagsmith if

  • You need feature flags.
  • You want to start without paying.
  • You work on web, api.
  • You also want segments.
Flagsmith review

Choose Langfuse if

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

Langfuse review

Questions people ask

Is Flagsmith or Langfuse better?
Neither clearly leads. Flagsmith starts at Free and Langfuse at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Flagsmith or Langfuse?
Flagsmith has a free tier; the other does not. Paid plans start at Free for Flagsmith and On request for Langfuse.
Does Flagsmith or Langfuse run on more platforms?
Flagsmith runs on web, api. Langfuse runs on Web.
Can I use Flagsmith for free?
Yes. Flagsmith has a free tier, so you can try it without paying. Langfuse starts at On request.
What is Flagsmith best used for?
Flagsmith is most often used for gradual feature rollouts across environments, remote configuration without redeploying code, running a/b tests tied to feature flags, self-hosting feature flags for data residency requirements. Of those, gradual feature rollouts across environments and remote configuration without redeploying code are not what Langfuse is typically brought in for.
What can Flagsmith do that Langfuse cannot?
Flagsmith covers Feature flags, Segments, A/B testing, Scheduled flags.

Answered from the vendors’ own pages

Flagsmith: What does Flagsmith cost?

Flagsmith has a Free plan, a Start-Up plan from $40-45/month, a Scale-Up plan from $250-300/month, and custom Enterprise pricing.

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

The Free plan supports up to 50,000 requests per month and 1 team member, with unlimited feature flags, environments, identities and segments.

Source
Flagsmith: How is usage metered?

Usage is metered by monthly API requests; exceeding a plan's limit triggers overage charges starting around $50 per million requests, with a 30-day grace period the first time a paid plan exceeds its limit.

Source
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