Coval vs Langfuse

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Cheaper paid plan: Langfuse — $29/mo vs $100/mo for Coval
Free plan: Only Langfuse (Coval has paid plans only)
Public API: Both have one
Higher Trust score: Coval — 88 vs 80 for Langfuse
Best fit: Coval: Product and QA teams shipping voice agents in regulated industries such as finance, insurance or healthcare · Langfuse: Engineering teams running LLM apps or agents in production who need traces and cost tracking

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

CovalSimulation, monitoring and human review platform for testing and evaluating voice and chat AI agents before and after launch.

LangfuseOpen-source LLM engineering platform for tracing agents, versioning prompts, running evals and tracking cost, hosted or self-hosted.

Side by side

Fact	Coval	Langfuse
Category	LLM Observability & Evaluation	LLM Observability & Evaluation
Pricing model	Paid	Freemium
Starts at	$100/mo	$29/mo
Public API	Yes	Yes
Trust score	88 / 100	80 / 100
Platforms	Web, API	Web, API
Company	Datawave, Inc. (dba Coval)	Langfuse GmbH
Launched	2024	2023
Last verified	Oct 2, 2026	Oct 29, 2026

What our research says

Coval

Coval is built for teams that already have a voice or chat agent heading to production and need repeatable evidence that it behaves, which a handful of manual test calls cannot give. It covers simulation, live monitoring and human review under one roof, and the price list is published. It is more tooling than a solo builder prototyping a bot will need, and simulation minutes burn through the cheaper tiers quickly.

Pros

Covers simulation, production monitoring and human review in one platform
Published tiers with unlimited seats from the Starter plan
API, CLI and MCP server fit into existing developer workflows
SOC 2 Type II, HIPAA and GDPR coverage is claimed on every plan

Cons

Entry price is $100 a month with only 100 simulation minutes
Starter retains traces for 30 days and offers email support only
The Starter and Growth trial needs a credit card

Langfuse

Langfuse is a strong default for teams that want tracing, prompt versioning and evaluations in one open-source tool, with the option to keep data on their own infrastructure. Teams that only want a hosted logging proxy with no SDK work, or that need guaranteed enterprise SSO without paying for add-ons, may find simpler or more bundled options.

Pros

MIT-licensed core that can be self-hosted without usage limits
Covers tracing, prompt management, evaluation and dashboards in one product
Generous free cloud tier and unlimited users from the $29 Core plan
OpenTelemetry support and SDKs for Python and JavaScript

Cons

Usage above the included 100k units is billed extra, so busy apps pay more than the headline price
Free tier keeps only 30 days of data and two users
Enterprise SSO and RBAC require the $300 Teams add-on on Pro or the Enterprise plan

Which one fits

Choose Coval if you need

Product and QA teams shipping voice agents in regulated industries such as finance, insurance or healthcare
Companies comparing voice-agent vendors on the same scripted scenarios
Engineering teams who want regression tests for prompt and model changes

Choose Langfuse if you need

Engineering teams running LLM apps or agents in production who need traces and cost tracking
Organisations that must self-host observability data for compliance
Teams that want prompts, datasets and evals tied to the same traces