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Machine Learning · head to head

Langwatch vs Voiceflow

Langwatch logo

Langwatch

Machine Learning

LLM engineering platform for testing and evaluating AI agents in production

From
Free
Free plan
Yes
Full reviewWebsite
Voiceflow logo

Voiceflow

AI

Design, build, and launch AI agents

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Each has a real cost: Langwatch free plan limited to 50k events per month, restricting larger deployments; Voiceflow the free plan is limited to a single active workspace collaborator, so team collaboration requires upgrading to the paid Pro or Team tiers
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Langwatch and Voiceflow actually diverge.

Attributes where Langwatch and Voiceflow differ
AttributeLangwatchVoiceflow
Pricing modelTiered subscription with usage-based overage chargesfreemium
PlatformsWeb, Docker, KubernetesWeb
CategoryMachine LearningAI

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

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 Langwatch

  • Agent simulation testing
  • LLM evaluation
  • OpenTelemetry tracing
  • Langy AI Engineer
  • Governance controls
  • Multiple deployment options
  • Framework support

Only in Voiceflow

Nothing recorded that Langwatch does not also cover.

What people use each for

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

Langwatch

  • Continuous testing of AI agents before production deploymentnot Voiceflow
  • Automated test creation from product requirementsnot Voiceflow
  • LLM response quality evaluation and scoringnot Voiceflow
  • Production agent monitoring and cost trackingnot Voiceflow
  • Governance and access control for AI systemsnot Voiceflow

Voiceflow

  • Automating customer support by resolving 59% of support tickets without human interventionnot Langwatch
  • Managing conversational agents across web, app, WhatsApp, SMS, and voice channels simultaneouslynot Langwatch
  • Designing and testing conversation flows visually before production deploymentnot Langwatch
  • Connecting AI agents to Salesforce, Shopify, Zendesk, Airtable for data integrationnot Langwatch

Where each one falls short

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

Langwatch

  • Free plan limited to 50k events per month, restricting larger deployments
  • Pricing in EUR may complicate budgeting for US-based teams
  • Usage-based overage model can create unpredictable costs
  • Self-hosted option requires DevOps expertise

Voiceflow

  • The free plan is limited to a single active workspace collaborator, so team collaboration requires upgrading to the paid Pro or Team tiers

Pricing, plan by plan

Langwatch

Free
  • DeveloperFree
    • 50k events per month
    • 14-day data access
    • 2 users
  • Growth$29/month
    • 200k events per month included
    • 5 EUR per 100k additional events
    • 30-day data retention
  • Enterprise$undefined/custom
    • Custom event limits
    • Hybrid, self-hosted or on-premises deployment
    • Custom SSO and RBAC

Voiceflow

Free

No published plan breakdown. See the Voiceflow review.

Which should you pick?

Choose Langwatch if

  • You need agent simulation testing.
  • You want to start without paying.
  • You work on Web, Docker, Kubernetes.
  • You also want llm evaluation.
Langwatch review

Choose Voiceflow if

  • You want to start without paying.
Voiceflow review

Questions people ask

Is Langwatch or Voiceflow better?
Neither clearly leads. Langwatch starts at Free and Voiceflow at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Langwatch or Voiceflow?
Langwatch starts at Free and Voiceflow at Free.
Does Langwatch or Voiceflow run on more platforms?
Langwatch runs on Web, Docker, Kubernetes. Voiceflow runs on Web.
Can I use Langwatch for free?
Both have a free tier, so you can try either at no cost before committing.
What is Langwatch best used for?
Langwatch is most often used for continuous testing of ai agents before production deployment, automated test creation from product requirements, llm response quality evaluation and scoring, production agent monitoring and cost tracking. Of those, continuous testing of ai agents before production deployment and automated test creation from product requirements are not what Voiceflow is typically brought in for.
What can Langwatch do that Voiceflow cannot?
Langwatch covers Agent simulation testing, LLM evaluation, OpenTelemetry tracing, Langy AI Engineer.

Answered from the vendors’ own pages

Langwatch: Is there a permanent free tier?

Yes, Langwatch's Developer plan is free forever with 50k events per month, 14-day data access, 2 users, and no credit card required. It is specifically designed for individual developers prototyping AI applications.

Source
Voiceflow: Can non-technical team members build conversational agents with Voiceflow?

Yes, Voiceflow's visual flow editor allows designers and non-technical staff to design conversation paths, test interactions in real-time, and iterate without writing code.

Source
Langwatch: What is Langy and how does it save time?

Langy is an AI-powered tool that automates test creation. It converts product requirements into test scenarios, runs simulations, scores results, and generates pull requests with fixes in a median of 14 minutes.

Source
Voiceflow: Does Voiceflow support HIPAA and GDPR compliance?

Yes, Voiceflow is used by healthcare and financial services organizations and offers HIPAA and GDPR compliance certifications for regulated customer interactions.

Source
Langwatch: What frameworks does Langwatch support?

Langwatch works with LangGraph, LangChain, CrewAI, OpenAI Agents, AWS Bedrock, Azure OpenAI, Vertex AI, and other major LLM frameworks and platforms.

Source
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