Side reads your conversations and drafts replies — you review and send. Set your mood, pick a persona, done.
You'll need a DeepSeek API key — free tier works fine.
Download the ZIP above. Open chrome://extensions, enable Developer mode, and click Load unpacked. Select the extracted extension/ folder.
Click the puzzle piece icon in Chrome → find Side → pin it to your toolbar. Click the ⚡ icon to open the setup popup.
In the popup, paste your DeepSeek API key and click Save. That's it — open WhatsApp Web and Side activates automatically.
The extension stores your API key locally in Chrome — it never leaves your browser. We don't have access to it. DeepSeek's free tier includes $5 in credits, which is plenty for months of daily use. See pricing →