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Langfuse vs Wraith

Observability for LLM apps, unrelated to interview assistance.

Side by side

What it is: Langfuse:Langfuse is an open-source platform for tracing, evaluating and monitoring LLM applications and AI agents.; Wraith:Invisible AI assistant that helps developers answer technical interview questions discreetly.
Best for: Langfuse:LLM observability & analytics; Wraith:Stealth AI support during interviews
Who it’s for: Langfuse:Developers building, debugging and scaling LLM-based apps and agents.; Wraith:Developers preparing for live technical interviews.
Pricing: Langfuse:Freemium; Wraith:Paid
Plans: Langfuse:Hobby Free · Core $29 per month · Pro $199 per month · Enterprise $2499 per month; Wraith:—
Open source: Langfuse:Yes, 35,097 GitHub stars; Wraith:—
Works with: Langfuse:Python, TypeScript, Go, Java, .NET, Ruby, PHP, Swift; Wraith:Ollama, Kilo Code, Windows, macOS, Linux
DevHunt upvotes: Langfuse:89; Wraith:1
Launched on DevHunt: Langfuse:Jan 2023; Wraith:Apr 2026

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.

Ghost Capture. Keeps the app frameless and out of shared-screen view.
Session Memory. Three-layer in-memory context tracks interview turns and follow-ups.
Resume Intelligence. Injects your resume data into prompts for personalized answers.
Connector System. Supports local Ollama and Kilo Code cloud models via a unified API.
Stealth Browser. Hardware toggles control mic, camera, audio and invisibility mode.
Smart Follow-up Detection. Auto-detects elliptical questions and rewrites them with full context.
Stream Cancel. Allows aborting any in-flight AI response instantly.
GPU Offload Controller. Adjusts GPU usage for real-time inference performance.

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