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Ha Ma
Ha Ma

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How I Built a Simple Gmail Follow-Up Reminder Chrome Extension

Like many people who work inside Gmail all day, I often caught myself thinking:

“Did I reply to that email?”

Gmail is great, but it doesn’t have a simple built-in way to visually track follow-ups directly in the inbox. Most tools hide reminders in side panels or require multiple clicks.

So I decided to build a small Chrome extension to solve this problem.

The Idea

The goal was simple:

Make follow-ups visible directly in the inbox

Reduce the number of clicks needed to set reminders

Keep everything private and local

The extension adds a few small features that change the workflow significantly.

Key UX Decisions

  1. One-Click Follow-Ups

Instead of opening a dialog every time, reminders can be set directly from the inbox row:

Click → reminder for tomorrow

Shift + Click → reminder next week

Alt + Click → custom date picker

This reduces friction when processing emails quickly.

  1. Visual Status Indicators

Reminders appear inside the Gmail thread list as badges:

Blue badge → scheduled follow-up

Red badge → overdue reminder

This makes it possible to scan your inbox and immediately see which conversations still need attention.

  1. Automatic Cleanup

If you reply to a thread, the reminder is automatically cleared.

This keeps the inbox from filling with outdated reminders.

  1. Dynamic Email Templates

Templates support simple variables like:

{first_name}

{subject}

{days_since}

These are replaced automatically when inserting a template.

The Result

The extension ended up becoming a lightweight productivity tool that helps reduce inbox anxiety and repetitive typing.

If you're curious about the project, you can check it out here:

👉 https://didireply.app

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