Tokumaru Labs

Small tools.
Clear purpose.

Tokumaru Labs builds focused browser tools and themes for everyday work, learning, and play.

集中する毎日に、静かに馴染む小さな道具。仕事にも、学びにも、遊びにも。

Products

Five small things, each built to do one job well. ひとつの目的に絞った、小さな道具たち。

Nagamaru Capture illustration: a cheerful camera mascot stitching several browser screenshots into one long page. In development開発中

Chrome Extension · In development

Nagamaru Capture

A cheerful, local-first full-page screenshot tool for Chrome, designed around Japanese users and long, changing pages.

長いページを、かわいくまるっと。遅延読み込みや無限スクロールにも配慮した、日本語UIのローカル完結キャプチャです。

In development · 開発中
Transcript Sidecar shown beside a video player, with timestamped transcript rows and copy controls in Chrome's Side Panel.

Chrome Extension

Transcript Sidecar

View, copy, format, and export YouTube transcripts from Chrome's Side Panel — no account, tracking, ads, or transcript server.

YouTube の字幕をサイドパネルで表示・コピー・保存。アカウント・トラッキング・広告はありません。

Overview 日本語の使い方 GitHub Chrome Web Store
Arcade Counter Timer: a count-up timer reading 00:12:34 and a large count of 18, with START and COUNT buttons.

Chrome Extension

Arcade Counter Timer

A count-up timer and tally counter that stays out of your way, then turns into a small arcade machine when you hit a milestone.

邪魔をしないカウントアップタイマーとタリーカウンター。節目にだけ、少しだけアーケードになります。

Overview GitHub Chrome Web Store
Midnight Cockpit theme preview with a deep-navy Chrome frame, subdued inactive tabs, and a cyan-accented active tab.

Chrome Theme

Tokumaru Midnight Cockpit

A calm, deep-navy Chrome theme with a cyan-to-blue accent on the active tab. Colors only — no scripts, no permissions.

深いネイビーに、アクティブタブだけシアン〜ブルー。色だけで作られた、静かな Chrome テーマです。

Overview GitHub Chrome Web Store
Progress Sidecar: a task list showing total, completed, remaining, and estimated remaining time, with an overall progress indicator.

Chrome Extension

Task Meter – Progress Sidecar

See total, completed, remaining, and estimated remaining time at a glance, and update progress right in the side panel.

総量・完了・残り・推定残り時間をひと目で。サイドパネルの一覧のまま進捗を更新できます。

Overview Privacy Chrome Web Store

Philosophy

A few rules that every Tokumaru Labs tool follows.

Focused

One clear purpose, done well.一つの目的を明確に。

Local-first

Your data stays on your device wherever possible.可能な限り、端末の中で。

Built to be used

Tools we actually want to reach for every day.毎日ほんとうに使いたいものを。

Tokumaru Labs is an independent software studio building small, focused tools. Tokumaru Labs は、小さく焦点の合ったソフトウェアをつくる個人開発スタジオです。