37x vs Letterhead
Side-by-side comparison of features, pricing, and ratings
At a glance
| Dimension | 37x | Letterhead |
|---|---|---|
| Pricing | Free | Contact for pricing |
| Target Audience | Consumers in 32 European countries | Multi-newsletter teams and publishers |
| Core Function | Price comparison across 3,000+ shops | Newsletter production and portfolio management |
| AI Features | None | AI agents for curation, segmentation, and analytics |
| Integration Capabilities | None listed | Zapier, REST API, webhooks, MCP server |
| Geographic Availability | 32 European countries | Global (internet-based) |
37x is a solid free tool for European shoppers seeking the lowest price on electronics or home goods, but its utility is limited to price comparison. Letterhead is a purpose-built enterprise platform for scaling multi-newsletter operations with AI and analytics. Choose 37x if you're a consumer bargain hunter; choose Letterhead if you're a media team needing to streamline newsletter production across multiple brands.
Email operating system for multi-newsletter teams: build, manage, and monetize at scale
Visit WebsiteWhat real users say: 37x vs Letterhead
Not marketing copy and not our opinion — a structured sweep of public discussion (reviews, forums, communities and video comments), showing what people praise and what they complain about for each tool.
37x
40 mentions across 2 sources · 0% positive — critical
Hacker News, Lemmy
What users praise
- • Free for consumers with no hidden fees.
- • Covers 32 European countries for cross-border shopping.
- • Independent, not a seller — no bias toward retailers.
- • Prices updated hourly for timeliness.
What frustrates them
- • Almost no community feedback to verify claims.
- • Name creates SEO noise from unrelated tech topics.
- • No user reviews on any major platform.
- • Real-world price accuracy and coverage unconfirmed.
Researched Jul 3, 2026
Letterhead
60 mentions across 3 sources · 0% positive — critical
Hacker News, Bluesky, Lemmy
What users praise
- • Targets multi-newsletter portfolio management with unified analytics.
- • Studio mode integrates with any ESP, avoiding migration pain.
- • Suite mode replaces ESP with built-in deliverability and IP warmup.
- • AI agents for content curation and audience segmentation.
What frustrates them
- • No community evidence validates claimed time or revenue gains.
- • Pricing is opaque — only 'contact us' with no public tiers.
- • Designed for large teams; solo newsletters get expensive overkill.
- • Only Zapier integration listed; missing Slack, HubSpot, etc.
Researched Jul 16, 2026
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
37x vs Letterhead: which should you choose?
37x is a solid free tool for European shoppers seeking the lowest price on electronics or home goods, but its utility is limited to price comparison. Letterhead is a purpose-built enterprise platform for scaling multi-newsletter operations with AI and analytics. Choose 37x if you're a consumer bargain hunter; choose Letterhead if you're a media team needing to streamline newsletter production across multiple brands.
Is 37x free?
Yes, 37x is completely free for consumers. It makes money through affiliate commissions when users click through to retailers.
Does Letterhead have a free plan?
No, Letterhead requires contacting sales for pricing. There is no free tier or self-serve signup.
Can 37x compare prices outside Europe?
No, 37x only supports 32 European countries. It does not cover other regions.
What integrations does Letterhead offer?
Letterhead integrates with Zapier and provides a versioned REST API, webhooks, and a native MCP server for AI agent integrations (announced Jan 2025).
Does 37x have an API?
No, 37x does not list any API or integration capabilities. It is purely a web-based price comparison tool.
Which tool is better for a single newsletter owner?
Neither is ideal for a simple single newsletter. Consider a dedicated email marketing platform instead.
Can Letterhead replace my existing email service?
Yes, Letterhead offers Studio (layers on top) and Suite (replaces ESP). Suite includes sending infrastructure and deliverability tools.
Does 37x show deals from all shops?
37x compares prices from over 3,000 shops, but not all retailers are included. It focuses on those in its CSS network.
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Last reviewed: July 3, 2026