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LabelStudio vs Phoenix
Side-by-side comparison of features, pricing, and ratings
Pricing
Freemium
Freemium
Plans
$0
Custom
$0/mo (open-source)
$0/mo (managed cloud)
Custom
Popularity
5.3k views
7.0k views
Skill Level
Intermediate
Intermediate
API Available
Platforms
WebAPICLI
WebAPICLI
Categories
📊 Data & Analytics🔬 Research & Education
💻 Code & Development📊 Data & Analytics
Features
Data labeling for image, text, audio, video, time series
Object detection with bounding boxes, polygons, keypoints
Named entity recognition (NER)
Audio transcription and speaker diarization
Time series classification and segmentation
Multi-modal labeling (image+text, audio+transcript)
LLM evaluation with custom rubrics and side-by-side comparison
Agentic trace evaluation and human-in-the-loop review
AI-assisted labeling with model pre-labeling
Programmable interfaces via API, Python SDK, webhooks
Customizable labeling templates and layouts
Data sync from any storage (S3, GCS, Azure)
Active learning workflow triggers
Self-hosted (Docker, pip, brew, git)
Community edition with 1M+ practitioners
Agent tracing: prompts, retrievals, tool calls, outputs
LLM-as-judge evaluations for scoring outputs
Annotation workflows with human review
Dataset creation from traces
Experiment runner for hypothesis testing
Prompt IDE for iterative prompt optimization
Evaluation on cost, latency, and performance
Self-hosting on Docker or Kubernetes
Cloud instances with no infrastructure setup
Vendor-agnostic: support for any model or framework
OpenTelemetry native support
Integrations
LlamaIndex
OpenTelemetry
NVIDIA NeMo Agent Toolkit
Docker
Kubernetes