AI annotates. Humans validate. Data ships.
The AI-native data quality platform with auto-completion, LLM-as-Judge, and agentic evaluators. Your AI does the heavy lifting — you keep the final word. Bring your own LLM, zero installation.
No credit card required · Bring your own LLM key
App preview — Screenshot coming soon
Plébiscité par plus de 1 000 entreprises
Des leaders du secteur et des équipes visionnaires nous font confiance pour accélérer l'innovation et relever leurs défis.
AI-Powered Annotation, Human-Validated Quality
Auto-completion, LLM judges, agentic evaluators — humans only where it matters.
AI Auto-Completion
Like GitHub Copilot for annotation. AI suggests the next label or span in real-time. Accept with Tab, reject with Esc. Never start from a blank page.
Learn moreAI Conversational Copilot
Chat with AI about the document you're annotating. Ask "What entities did I miss?" or "Is this span a PERSON or ORG?". Context-aware, schema-aware.
Learn moreLLM-as-Judge
Your LLM automatically scores annotation quality (0-1 per span). Prioritize human review on low-confidence annotations. Save time on the obvious cases.
Learn moreAgentic Team Evaluators
Multiple LLM agents annotate independently, then an adjudicator agent resolves conflicts. Simulates an annotation team at near-zero marginal cost.
Learn moreDrag & Drop Schema Builder
Create annotation schemas visually — NER, classification, audio segments. Zero XML, zero JSON, zero code. Non-technical teams can set up in minutes.
Learn moreAI vs Human Agreement
Beyond Cohen's kappa: measure what fraction of AI pre-annotations humans accepted, corrected, or rejected. Optimize your LLM prompts with data.
Learn moreYour Data, Your Models:
Zero Lock-in, Full Control
Connect your S3, GCS, or Azure bucket — files stream directly to annotators via presigned URLs. Your data never lands on our servers.
Credentials encrypted in GCP Secret Manager. IAM-scoped to read-only from our Cloud Run IP.
Configure your LLM via the UI — LiteLLM proxy or direct API key. Supports Anthropic, OpenAI, Mistral, Azure, Groq, and Ollama.
We never charge you for tokens. Your key, your costs, your control.
AI Does the Work.
Humans Keep Control.
Comparison
How Tagnos compares
The only annotation platform where AI is a first-class citizen — not a plugin added after the fact.
| Feature | Tagnos | Label Studio | Doccano | Argilla |
|---|---|---|---|---|
| AI auto-completion (inline suggestions) | ||||
| AI conversational copilot | ||||
| LLM-as-Judge (auto quality scoring) | ||||
| Agentic team evaluators | ||||
| AI vs Human agreement metrics | ||||
| BYOLLM (bring your own LLM) | ||||
| BYOS (data stays on your storage) | enterprise | |||
| Zero installation | ||||
| Visual schema builder (no code) | partial | |||
| Native audio annotation | partial | |||
| Freelancer access management | partial | |||
| Inter-annotator agreement (IAA) | enterprise | partial |
Simple, Transparent Pricing
You bring your LLM key — we never charge you for tokens.
Free
Try Tagnos on a single project.
- 1 project
- 100 documents
- BYOLLM required
- Text + audio annotation
- JSONL / CSV export
- Community support
SME
For teams building NLP datasets.
- Unlimited projects
- Up to 10 users
- BYOLLM + BYOS
- Inter-annotator agreement (IAA)
- HuggingFace export
- Freelancer access windows
- CoNLL export
- Priority email support
Agency
For agencies managing annotators at scale.
- Everything in SME
- Unlimited users
- SSO (SAML)
- Audit trail
- Custom roles (RBAC)
- Dedicated support
- SLA guarantee
FAQ
Frequently asked questions
Let AI annotate. You validate.
Join the early access. AI auto-completion, LLM-as-Judge, agentic evaluators — all powered by your own LLM key. Free plan, no credit card.