Chrome Extension

Set up SendPI in 60 seconds

Download and install the Chrome extension manually. Start predicting how your messages will land — on Gmail, Slack, LinkedIn, WhatsApp, and any website.

Installation Steps

Follow these steps to manually install the SendPI Chrome Extension. It takes about 60 seconds.

1

Download the extension

Click the button below to download the SendPI Chrome Extension zip file.

2

Unzip the file

Find the downloaded sendpi-extension.zip file and unzip/extract it to a folder on your computer.

On Mac: double-click the zip. On Windows: right-click → Extract All.
3

Open Chrome Extensions

Open Chrome and go to chrome://extensions in the address bar. Or click the three dots menu → Extensions → Manage Extensions.

You can also type chrome://extensions directly in your address bar.
4

Enable Developer Mode

Toggle the "Developer mode" switch in the top-right corner of the extensions page. This is required to load the extension manually.

5

Load the extension

Click "Load unpacked" button that appears in the top-left. Select the folder where you unzipped the extension files.

Select the folder that contains manifest.json — not the zip file itself.
6

Pin SendPI to your toolbar

Click the puzzle icon in Chrome's toolbar, find SendPI, and click the pin icon so it's always visible. You're ready to go!

Quick Summary
Download zip
Unzip
chrome://extensions
Developer Mode ON
Load unpacked
Pin to toolbar

What the extension does

Real-time PI Score

See your 0-100 score update as you type. Know exactly how your message will land before hitting send.

15+ Emotional Signals

Detects aggressive, passive-aggressive, guilt-tripping, over-apologizing, sarcasm, dismissive, and more.

One-click Rewrite

7 tones, 12 intents — choose how you want to come across and SendPI rewrites it for you.

Context Modes

Set your profession and relationship (boss, client, team) for context-aware rewrites.

PI Craft

Turn rough AI instructions into precision casts for ChatGPT, Claude, Gemini, and more.

Works Everywhere

Gmail, Slack, LinkedIn, WhatsApp Web, Twitter/X, Reddit — any text field on any website.

Using SendPI on your favorite platforms

Gmail

  1. 1Open Gmail and compose a new email
  2. 2Start typing your message
  3. 3SendPI panel appears at the bottom-right of the compose window
  4. 4Check your PI Score and rewrite if needed before clicking Send

Slack

  1. 1Open any Slack channel or DM
  2. 2Click the message input and start typing
  3. 3SendPI floating panel appears near the input field
  4. 4Great for preventing Slack misunderstandings in async communication

LinkedIn

  1. 1Open LinkedIn messaging or post composer
  2. 2Type your message or post
  3. 3SendPI analyzes tone — especially useful for cold outreach and connection requests
  4. 4Rewrite to sound professional and get more replies

WhatsApp Web

  1. 1Open web.whatsapp.com in Chrome
  2. 2Select a conversation and start typing
  3. 3SendPI appears to analyze your message tone
  4. 4Perfect for sensitive personal or professional conversations

How it connects to your account

Open the extension popup, enter your email, and verify with a 6-digit code. Your account syncs instantly.

Privacy first

Your message content never leaves your device. Zero storage.

Email login

No password needed. Enter email, get code, connect instantly.

Works offline

Basic emotion detection runs locally even without internet.

Troubleshooting

Still having issues?

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