writeGPT vs Letterhead
Side-by-side comparison of features, pricing, and ratings
At a glance
| Dimension | writeGPT | Letterhead |
|---|---|---|
| Best For | Knowledge workers needing AI on any website | Teams scaling multi-newsletter operations |
| Pricing | Freemium | Contact sales (custom enterprise pricing) |
| Core Function | Browser extension for ChatGPT on any site | Newsletter OS with AI agents & portfolio management |
| AI Features | Context-aware suggestions, summarize, rewrite, code | AI curation, segmentation, portfolio recommendations |
| Integrations | No native integrations listed | Zapier, MCP server, REST API, webhooks |
| Latest News | Gemma-4 26B runs on CPU at 124 tok/s; ARM64 web server demo | Native MCP server for AI agent integrations (Jan 2025) |
writeGPT is the pick if you need instant AI help across any website — summarizing, writing, or coding without leaving your browser. Letterhead wins for teams running a portfolio of newsletters, offering AI agents for content curation and segmentation. Choose writeGPT for personal productivity; choose Letterhead for multi-newsletter ops at scale.
Email operating system for multi-newsletter teams: build, manage, and monetize at scale
Visit WebsiteWho should pick which
- Knowledge professional needing quick AI help while browsingPick: writeGPT
writeGPT's browser extension provides context-aware AI on any website, ideal for summarizing, writing, and research without leaving the page.
- Newsletter team managing multiple brandsPick: Letterhead
Letterhead's portfolio management, AI agents for curation, and unified analytics are purpose-built for multi-newsletter operations.
- Developer wanting code generation while codingPick: writeGPT
writeGPT generates code snippets directly in the browser, useful for quick coding assistance during development.
- Media company scaling email revenuePick: Letterhead
Letterhead offers direct ads, programmatic, house promotions, and conversion CTAs within a unified portfolio analytics dashboard.
- Solo creator sending a single newsletterPick: writeGPT
Letterhead is overkill for one newsletter; writeGPT's free tier can assist with writing and research at no cost.
Frequently Asked Questions
writeGPT vs Letterhead: which should you choose?
writeGPT is the pick if you need instant AI help across any website — summarizing, writing, or coding without leaving your browser. Letterhead wins for teams running a portfolio of newsletters, offering AI agents for content curation and segmentation. Choose writeGPT for personal productivity; choose Letterhead for multi-newsletter ops at scale.
Does writeGPT work on Firefox or Safari?
No, writeGPT is a Chrome extension only.
Can Letterhead replace my existing ESP?
Yes, the Suite mode replaces the ESP with built-in audience management, sending, and deliverability tools.
Is writeGPT free?
writeGPT is freemium, so there is a free tier with optional paid features.
Does Letterhead support transactional emails?
Yes, transactional email support is available in the Suite plan.
What is the MCP server in Letterhead?
Announced Jan 2025, it's a native server that lets AI agents read data, sync audiences, and curate content across newsletters.
Can writeGPT summarize long articles?
Yes, it can read and summarize page content using ChatGPT.
Does Letterhead have a self-serve signup?
No, pricing is contact-based and requires a sales call.
What hardware does writeGPT's latest news about Gemma-4 require?
Gemma-4 26B runs on CPU only via Apeg.dev at 124 tokens/sec, no GPU needed.
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Last reviewed: July 3, 2026