# Smart Subjects AI-Powered Subject Lines & Preview Texts

## Use AI to craft compelling email subject lines and preview texts that boost open rates and save time.

**Smart Subjects** is a tool that helps newsletter publishers quickly generate effective, on-brand email subject lines and preview text using AI.

Writing compelling subject lines and preview texts can take time and effort. Smart Subjects reduces that workload by suggesting optimized options based on your newsletter content and past performance.

#### How It Works

- When scheduling a newsletter, you’ll see a Generate with AI icon '**✨**' in the **Subject line** and **Preview text** fields.
- The AI uses your newsletter’s **themes, headlines, and top-performing past subject lines** to suggest options.
- You can **refine** or **regenerate** these suggestions before sending.

#### How to Use Smart Subjects

Smart subjects \| HubSpot Video

1. **Compose your newsletter** as usual.
2. Click **Preview and Schedule**.
3. On the right-hand side, locate the **Inbox Preview** section.
4. In the **Email Subject** or **Preview Text** field, click the **AI icon**.
5. The field will display _“Generating…”_ and then populate with the AI suggestion.

Review the result: you can **edit**, **refine**, or **regenerate** until you’re satisfied.

ℹ️  **Note**

If you’re not scheduling immediately, be sure to Save as Draft so your AI-generated subject line and preview text are not lost.

#### Best Practices Built In

Our generator is designed to:
- Avoid spam trigger words and phrases.
- Keep subject lines **concise, simple, and attention-grabbing**.
- Learn from your **top 5 performing subject lines** to optimize for higher open rates over time.