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kei31

Substacknewsletter · by kei31

Investigate Visit
Audience
Not shown publicly
We show a dash rather than guess
Observed frequency
Several times a week
From 3 posts indexed in the last 90 days
Last post
Nov 9, 2026
6 days ago
Likely audience
personal productivity enthusiasts
Inferred from post content

kei31 is a Substack newsletter by kei31 covering personal knowledge management, AI-augmented note-taking and voice-to-text memo capture. NewsletterFIT indexed 3 posts from it in the last 90 days, most recently on Nov 9, 2026.

Topics

Recent posts

  • 全人類に告ぐ！徹底的に自…
  • ポッドキャスト1本を、記…
  • ポッドキャストを配信する…

Sponsors detected

No sponsored posts detected in the last 180 days of indexed posts.

Detected automatically from posts marked as sponsored. Detection can miss or misread placements.

See the full picture on kei31

Subscriber momentum over time, every detected sponsor with the source post, companies and people it mentions, guests, and an alert when any of it changes.

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Compiled from public pages · refreshed Nov 9, 2026 · How NewsletterFIT collects and labels data