37x vs Letterhead
Side-by-side comparison of features, pricing, and ratings
At a glance
| Dimension | 37x | Letterhead |
|---|---|---|
| Pricing | free | contact · from Studio Custom (contact sales) |
| Best for | Consumers in 32 European countries looking for the best price on electronics, fashion, home goods, and more, Budget-conscious shoppers who want hourly price updates without signing up for anything | Newsletter teams managing multiple newsletters or brands, Media companies and publishers scaling email operations |
| Standout features | Real-time price comparison across 3,000+ shops · Search by product, brand, or model · Live prices updated hourly | AI agents for content curation and audience segmentation · Global lockable drag-and-drop email templates · Unified portfolio analytics with AI recommendations |
| Viability score | 87/100 | 75/100 |
| API | No | Yes |
37x is the stronger pick for consumers in 32 european countries looking for the best price on electronics, fashion, home goods, and more; Letterhead fits better for newsletter teams managing multiple newsletters or brands.
Built from live tool data, last verified 2026-07-17.
Who should pick which
- European bargain hunterPick: 37x
37x is free, covers 32 European countries, and provides hourly price updates across thousands of shops. Perfect for finding the best deal without any commitment.
- Multi-newsletter publisherPick: Letterhead
Letterhead offers portfolio management, AI agents for curation, unified analytics, and revenue tools designed for scaling multiple newsletters. The MCP server integration (added Jan 2025) allows custom AI workflows.
- Solo creator with one newsletterPick: Letterhead
Letterhead is overkill and likely too expensive. A simpler tool like Mailchimp or ConvertKit would be more suitable. Neither tool is ideal; suggest looking elsewhere.
- Retailer seeking CSS partnerPick: 37x
37x is a Google Shopping CSS partner with no setup fees, offering commission-based monetization. Retailers can list products without upfront cost and reach price-conscious shoppers across 32 countries.
- Enterprise with existing ESPPick: Letterhead
Letterhead's Studio mode layers portfolio analytics, AI, and revenue tools on top of an existing ESP, enabling advanced newsletter operations without migrating send infrastructure.
Frequently Asked Questions
Which is better, 37x or Letterhead?
The best choice between 37x and Letterhead depends on your specific use case — we compare them independently on features, current pricing, integrations, and real-world signals (with an on-demand sentiment scan available for each). See the side-by-side breakdown above to match them to your needs.
What are the main differences between 37x and Letterhead?
The key differences include pricing model, feature set, platform support, and skill level requirements. Review the full comparison on RightAIChoice for a detailed breakdown.
Is there a free version of 37x or Letterhead?
Check the pricing section in the comparison for the latest pricing details on both tools, including free tiers, trial options, and paid plans.
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