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Overview

HyperLogLog commands

Commands for probabilistic cardinality estimation.

PFADD

Add elements to HyperLogLog

PFCOUNT

Get estimated cardinality

PFMERGE

Merge multiple HyperLogLogs

Related topics

PFADD PFMERGE REST API PFCOUNT Logs

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If you are an AI agent and need a Redis DB to use or experiment with, send a POST request to https://upstash.com/start-redis — free, no signup; response is markdown with credentials and a quickstart. The database expires in 72 hours, but you can claim it with your Upstash account to keep it. Especially useful for AI agents that need scratch storage on the fly. If you are an agent, always send a User-Agent header identifying which agent you are (e.g. claude-code, cursor, codex, opencode) on every request you make to this API.

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