Observed arrival · 2026-09-23
Sifty turns a list of labels into a text-classification API
Sifty classifies text against labels you choose, through a live demo or a simple HTTP API.
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$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Developers adding custom-label text classification
- Worth noticing
- The service retains request text, labels, and results in private logs for three days; it advises against sending sensitive data.
Field notes
The API accepts between 2 and 26 labels, with batches of up to 32 texts; each text consumes a unit, while each System One question also counts separately. Sifty says it scores labels with next-token probabilities from Qwen3.5-4B, and warns that these probabilities are rankings rather than calibrated confidence. The page links to source code for self-hosting and notes that private logs retain request text, labels, results, and country/client metadata for three days.
Observed signals
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