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Langfuse vs PromptForge

Offers open-source observability for LLM apps, unrelated to prompt discovery or UI extensions.
LangfuseOpen Source Observability & Analytics for LLM Apps 🕵️‍♂️PromptForgeSupercharge ChatGPT, Bard & Claude

Side by side

What it is
Langfuse:Langfuse is an open-source platform for tracing, evaluating and monitoring LLM applications and AI agents.
PromptForge:PromptForge is a browser extension that lets you discover, run, and manage AI prompts directly inside ChatGPT, Gemini, Claude, MidJourney and more.
Best for
Langfuse:LLM observability & analytics
PromptForge:One-click prompt management inside AI web apps
Who it’s for
Langfuse:Developers building, debugging and scaling LLM-based apps and agents.
PromptForge:Developers and prompt engineers who use web-based AI chat and image generators.
Pricing
Langfuse:Freemium
PromptForge:Freemium
Plans
Langfuse:Hobby Free · Core $29 per month · Pro $199 per month · Enterprise $2499 per month
PromptForge:—
Open source
Langfuse:Yes, 35,097 GitHub stars
PromptForge:—
Works with
Langfuse:Python, TypeScript, Go, Java, .NET, Ruby, PHP, Swift
PromptForge:ChatGPT, Google Gemini, Claude, MidJourney
DevHunt upvotes
Langfuse:89
PromptForge:14
Launched on DevHunt
Langfuse:Jan 2023
PromptForge:Jan 2024

Langfuse features

  • Hierarchical Traces. Capture every LLM call, tool invocation and retrieval step with filters for user, session, cost and latency.
  • Prompt Management. Version, fetch, release and cache prompts separately from code with one-click deployments.
  • Evaluation Engine. Run LLM-as-judge, heuristic or human-review evaluations on production data or experiments.
  • Experiments & Datasets. Define test cases, run experiments and create golden datasets for continuous improvement.
  • Dashboards & Alerts. Monitor cost, latency and quality via custom dashboards and automated alerts.
  • Human Annotation. Collaborative human-in-the-loop workflows with annotation queues.
  • Extensive Integrations. Supports Python, TypeScript, Go, Java, .NET, Ruby, PHP, Swift and 100+ agent frameworks and model providers.
  • Self-hosted & Cloud Options. Available as hosted SaaS or self-hosted under MIT license.
Langfuse on DevHunt →Alternatives

PromptForge features

  • Community & Private Prompts. Browse, save, and share thousands of community prompts or create private collections.
  • Prompt Variables. Add dynamic variables to prompts for reusable, customizable inputs.
  • Quick Continue. Insert predefined continuations into a chat with over 30 options or custom ones.
  • Prompt Extenders. Inject extra data, tone, or style modifiers into any prompt with a single click.
  • Advanced Search. Find prompts quickly using rich filtering across collections and tags.
  • Web Scraping. Live web-scraping service to pull up-to-date information into prompts.
  • Customization Settings. Adjust display, language, tone presets, and other UI options to suit your workflow.
  • Sync Across Platforms. Your prompts, favorites, and collections sync automatically across supported AI platforms.
PromptForge on DevHunt →Alternatives

Based on each tool's website and DevHunt data. Details may change; check the official sites.