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Login is required before upload/annotation. Your progress is saved to cloud and can be resumed next time.

After sign-in, you will see upload + saved datasets.

Saved Datasets

Sign in to load saved datasets.

Upload a dataset and build a clean annotation trail.

Bring a CSV (or JSONL) containing sentences. We will infer columns, then guide you through fact vs non-fact labeling with autosave and export.

Cloud synced

Local autosave

Structured JSON export

Drop CSV/JSONL here

or click to browse files

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Delimiter

Header row

Text column

Sentence mode

Split into sentences (recommended)

1 / 1 Unlabeled

Upload a dataset to begin.

Shortcuts: F Fact, N Non-Fact, ← Prev, → Next

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