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Marketing · head to head

Insider vs Sailthru

Insider logo

Insider

Marketing

Omnichannel personalisation platform with web experimentation and WhatsApp as first-class channels

From
On request
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

  • Each has a real cost: Insider delivery depends heavily on the assigned account team, so results vary by region and a team change mid-contract can be felt immediately in campaign output.; 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: Insider covers Architect journeys, Sailthru covers Interest profiles.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Insider and Sailthru actually diverge.

Attributes where Insider and Sailthru differ
AttributeInsiderSailthru
PlatformsWeb, iOS, Android, REST APIWeb, REST API
CategoryMarketingEmail Marketing

Identical on both: starting price (On request), pricing model (quote), free tier (No), 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 Insider

  • Architect journeys
  • Web and app personalisation
  • WhatsApp commerce
  • Predictive segments
  • InStory and InMobile
  • Experimentation

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.

Insider

  • A retailer in a WhatsApp-first market that needs conversational commerce rather than more email volumenot Sailthru
  • Personalising category and product pages by segment without waiting for engineering release cyclesnot Sailthru
  • A marketing team without in-house campaign operations that needs the vendor to build and run journeysnot Sailthru
  • Unifying web, app and messaging targeting on one profile store after outgrowing separate point toolsnot Sailthru

Sailthru

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

Where each one falls short

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

Insider

  • Delivery depends heavily on the assigned account team, so results vary by region and a team change mid-contract can be felt immediately in campaign output.
  • The suite is licensed by module, so the platform fee quoted at the start typically excludes the channels and predictive features that make the business case work.
  • Template-driven web personalisation targets the rendered DOM, which breaks on single-page applications that re-render after the template applies unless a developer wires in the framework hooks.
  • Reporting exports are limited compared with warehouse-native tools, so teams that want campaign data alongside finance data end up pulling it through the API on a schedule.
  • Contracts are annual and negotiated per traffic band, so a seasonal spike in visitors can push you into a renegotiation rather than a metered overage.

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

Insider

On request
  • Insider Growth Management Platform$undefined/year
    • Licensed by module and by monthly traffic or user volume
    • Channels such as WhatsApp, SMS and email priced separately
    • Annual contract with an assigned delivery team

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 Insider if

  • You need architect journeys.
  • You work on Web, iOS, Android, REST API.
  • You also want web and app personalisation.
Insider 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 Insider or Sailthru better?
Neither clearly leads. Insider starts at On request and Sailthru at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Insider or Sailthru?
Insider starts at On request and Sailthru at On request.
Does Insider or Sailthru run on more platforms?
Insider runs on Web, iOS, Android, REST API. Sailthru runs on Web, REST API.
What is Insider best used for?
Insider is most often used for a retailer in a whatsapp-first market that needs conversational commerce rather than more email volume, personalising category and product pages by segment without waiting for engineering release cycles, a marketing team without in-house campaign operations that needs the vendor to build and run journeys, unifying web, app and messaging targeting on one profile store after outgrowing separate point tools. Of those, a retailer in a whatsapp-first market that needs conversational commerce rather than more email volume and personalising category and product pages by segment without waiting for engineering release cycles are not what Sailthru is typically brought in for.
What can Insider do that Sailthru cannot?
Insider covers Architect journeys, Web and app personalisation, WhatsApp commerce, Predictive segments. Sailthru covers Interest profiles, Personalisation engine, Prediction Manager, Site personalisation.

Answered from the vendors’ own pages

Insider: Is WhatsApp actually usable at scale here?

Yes. It is a supported primary channel with catalogue and template message support, though WhatsApp conversation fees from Meta are passed through and are separate from the licence.

Sailthru: Who owns Sailthru now?

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

Insider: Can we run it without vendor help?

You can, but the pricing assumes a managed relationship. Teams with strong in-house campaign operations often find they are paying for services they do not use.

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.

Insider: Does it work for B2B?

Rarely a good fit. The segmentation, recommendations and channel mix are built around high-frequency consumer behaviour.

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.

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