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Buttondown vs Sailthru

Buttondown logo

Buttondown

News

The easiest way to start and grow your newsletter

From
Free
Rated
-
Full reviewWebsite
Sailthru logo

Sailthru

Email Marketing

Retail and publisher email personalisation, now one product inside the Marigold portfolio

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Buttondown has a free tier, so it costs nothing to try first.
  • Each has a real cost: Buttondown limited built-in monetization compared to Substack, which offers native payment processing; Sailthru the product sits in a portfolio with several overlapping platforms under one owner, so roadmap investment is a portfolio decision rather than a product decision and is worth asking about in writing.
  • They diverge on capability: Buttondown covers Newsletter creation, Sailthru covers Interest profiles.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Buttondown and Sailthru actually diverge.

Attributes where Buttondown and Sailthru differ
AttributeButtondownSailthru
Starting priceFreeOn request
Pricing modelUnknownquote
Free tierYesNo
PlatformsWebWeb, REST API
CategoryNewsEmail Marketing
Founded2017Unknown

Identical on both: user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Buttondown

  • Newsletter creation
  • Markdown support
  • Subscriber management
  • Analytics
  • Paid subscriptions
  • Zapier
  • Stripe
  • Twitter

Only in Sailthru

  • Interest profiles
  • Personalisation engine
  • Prediction Manager
  • Site personalisation
  • Zephyr templating
  • Lifecycle optimiser

What people use each for

The jobs each tool is most often brought in to do.

Buttondown

  • Newsletter publishingnot Sailthru
  • Email marketingnot Sailthru
  • Audience buildingnot Sailthru

Sailthru

  • A publisher sending a personalised daily newsletter assembled per reader from a content cataloguenot Buttondown
  • A retailer that wants email and on-site recommendations driven by the same affinity modelnot Buttondown
  • High-cadence sending where per-recipient content assembly matters more than journey branchingnot Buttondown
  • Teams that want churn and lifetime value scores available as native campaign conditions rather than imported fieldsnot Buttondown

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Buttondown

  • Limited built-in monetization compared to Substack, which offers native payment processing
  • Fewer growth and discovery features compared to Beehiiv or Ghost
  • Smaller community and ecosystem than larger newsletter platforms
  • Basic automation compared to full-featured email marketing platforms
  • No native mobile app for managing newsletters on the go

Sailthru

  • The product sits in a portfolio with several overlapping platforms under one owner, so roadmap investment is a portfolio decision rather than a product decision and is worth asking about in writing.
  • Pricing counts stored profiles, so retained inactive readers keep costing money long after they stopped opening anything.
  • On-site personalisation requires a developer to implement the JavaScript and maintain the content feed, which puts the highest-value feature behind engineering time.
  • Zephyr is a proprietary templating language, so template maintenance skills are scarce compared with the Liquid syntax used by most competitors.
  • It is built for high-cadence content and retail sending, and B2B lifecycle programmes with long sales cycles sit poorly on the model.

Pricing, plan by plan

Buttondown

Free
  • Free$undefined/mo
    • Up to 100 subscribers
    • Core newsletter features
    • Hosted archives
  • Paid$undefined/mo
    • Pricing scales by subscriber count above 100
    • Add-on features from $9/month

Sailthru

On request
  • Sailthru$undefined/year
    • Priced on stored profiles and send volume
    • Site personalisation and prediction features licensed by module
    • Annual contract through Marigold

Which should you pick?

Choose Buttondown if

  • You need newsletter creation.
  • You want to start without paying.
  • You also want markdown support.
Buttondown review

Choose Sailthru if

  • You need interest profiles.
  • You work on Web, REST API.
  • You also want personalisation engine.
Sailthru review

Questions people ask

Is Buttondown or Sailthru better?
Neither clearly leads. Buttondown starts at Free and Sailthru at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Buttondown or Sailthru?
Buttondown has a free tier; the other does not. Paid plans start at Free for Buttondown and On request for Sailthru.
Does Buttondown or Sailthru run on more platforms?
Buttondown runs on Web. Sailthru runs on Web, REST API.
Can I use Buttondown for free?
Yes. Buttondown has a free tier, so you can try it without paying. Sailthru starts at On request.
What is Buttondown best used for?
Buttondown is most often used for newsletter publishing, email marketing, audience building. Of those, newsletter publishing and email marketing are not what Sailthru is typically brought in for.
What can Buttondown do that Sailthru cannot?
Buttondown covers Newsletter creation, Markdown support, Subscriber management, Analytics. Sailthru covers Interest profiles, Personalisation engine, Prediction Manager, Site personalisation.

Answered from the vendors’ own pages

Buttondown: How much does Buttondown cost?

Buttondown is free for your first 100 subscribers and includes core newsletter features. After that, pricing scales based on subscriber count. Add-on features start at $9/month each.

Source
Sailthru: Who owns Sailthru now?

Marigold, formerly CM Group, which also owns Campaign Monitor, Emma, Selligent, Liveclicker and Cheetah Digital.

Buttondown: What editor options does Buttondown offer?

Buttondown supports Markdown, HTML, and WYSIWYG editors so you can compose newsletters in your preferred format.

Source
Sailthru: Does that affect the roadmap?

It can. Overlapping products in one portfolio compete for investment, so ask which platform is the strategic one for your segment before signing multi-year.

Buttondown: Does Buttondown track analytics?

Analytics are disabled by default in Buttondown, prioritizing privacy. You can enable tracking if desired, and the platform is GDPR-compliant.

Source
Sailthru: Is it worth it just for newsletters?

For personalised daily newsletters at publisher scale it remains one of the strongest options. For simple broadcast sending it is heavily over-specified.

Buttondown: What is Buttondown's company structure?

Buttondown is an independent, self-funded, and profitable SaaS platform founded by Justin Duke with no plans to take external investment or change that model.

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