Compare · Letterhead vs Sailthru
Outgrown Sailthru? Switch to a complete platform built for content.
Sailthru is a personalization-led ESP for retail and media. Newsletter teams switch to Letterhead Suite — a complete email and audience platform — for real template control, content-first workflows, modern AI, and a platform that’s easier to run, at a better price.
Why teams choose Letterhead over Sailthru
Built for newsletters, easier to run, better priced.
Sailthru was built as a personalization-led ESP. Newsletter teams need template control, editorial workflows, and modern AI — without the cost and complexity.
Own your templates
Full template and layout control — restyle any edition without a developer or a support ticket.
Content-first workflows
Curation, editorial roles, approvals, and scheduling built for editions — and far easier to run day to day.
Modern AI, built in
AI curation, subject-line help, and content assistance live inside the workflow, not bolted on.
A better price
Newsletter operations at portfolio scale without enterprise-ESP pricing or long lock-in.
Head to head
Where Letterhead fits next to Sailthru.
| Capability | Letterhead | Sailthru |
|---|---|---|
| Scope | A complete email + audience platform, with a content engine. | Personalization-led ESP for retail and media. |
| Template control | Own your templates and layouts; restyle without code. | Native drag-and-drop composer; Zephyr scripting for advanced dynamic content. |
| Content & curation | RSS, bookmarks, AI curation, and editorial slots. | Template/zone composer with dynamic content from data feeds. |
| Editorial workflow | Multi-role roles, approvals, and scheduling for editions. | Campaign and trigger setup; no native multi-author editorial workflow. |
| Modern AI | AI curation, subject lines, and content help in-workflow. | Predictive personalization, next-best-action, and send-time optimization (Prediction Manager). |
| Ease of use | Built for editorial teams to run themselves. | Enterprise ESP; onboarding involved, with a learning curve for advanced (Zephyr) personalization. |
| Personalization & send-time | Reader-level 1:1 personalization, AI recommendations, and send-time optimization. | Reader-level 1:1 personalization and send-time options. |
| Price | Portfolio-scale pricing, no long lock-in. | Enterprise ESP pricing and contracts. |
FAQ
Letterhead vs Sailthru: your questions, answered.
Who owns Sailthru now — Marigold or Zeta Global?
As of July 2026, Sailthru is a Zeta Global product. Zeta completed its acquisition of Marigold’s enterprise business — including Sailthru — on November 24, 2025. Marigold kept its SMB products, such as Campaign Monitor and Emma.
Is Letterhead a replacement for Sailthru?
It can be. Many newsletter teams move production, curation, portfolio management, and monetization to Letterhead Suite; others keep sending through Sailthru and add Letterhead on top. Both paths work — we’ll map whichever fits your stack.
Do you need a developer to build emails in Sailthru?
Sailthru has a drag-and-drop editor for standard sends. Its more advanced, per-recipient personalization is built with Sailthru’s Zephyr scripting language, which typically involves a developer. Letterhead gives editors no-code control over layouts and dynamic content.
Does Sailthru handle newsletter ad sales and sponsorships?
Sailthru’s documented toolset centers on personalization, lifecycle messaging, and recommendations; it doesn’t include built-in newsletter ad-inventory or sponsorship management. Letterhead’s Revenue module manages direct ads, house promotions, and per-send reporting.
How much does Sailthru cost?
Sailthru is quote-based and enterprise-oriented — it doesn’t publish list pricing and has no free trial. Independent estimates (for example, Vendr, early 2026) put mid-market deployments in the tens of thousands of dollars a year, and large enterprise higher. Letterhead prices to your portfolio size.
How long does it take to switch from Sailthru to Letterhead?
Most teams are live in days, not quarters. We map your templates and audiences, and you can send through Letterhead or keep your current ESP.
What customers say
Letterhead has been an invaluable resource for us. Not only did it meet our budget needs, but it also enabled us to create personalized, creative newsletters that made our brand stand out. Their flexible platform allowed us to grow and adapt as our subscriber list and needs changed.
Jessica FordDirector, Startup Digest, TechstarsIt’s made newsletter advertising cleaner, more consistent, and far less time-consuming. Thanks to Letterhead, our newsletters have become the cornerstone of our strategy.
Danielle HastingsVP of OperationsWe at the Patch local news network have worked with Letterhead to create a critical monetization engine. They’ve been the best kind of partner — striving to understand our needs, quick to respond, and building for the future. Couldn’t have done it without them!
Simone WilsonSenior Manager, Patch.comSee your Sailthru newsletters on Letterhead.
Bring a recent Sailthru send and your templates. We’ll show you the same program with full template control, modern AI, and an easier workflow — and exactly what the switch looks like.