How does the Supascribe Popup Modal work?

The popup is an overlay that appears on your website based on a trigger you set — exit intent, scroll depth, or time on page. When it fires, visitors see a branded subscribe form and can sign up to your Substack list without leaving the page.

Does the popup work on mobile?

Yes. The popup is mobile-responsive by default. Exit intent isn't available on mobile (no cursor), but scroll depth and time on page both work.

Does it work on any website?

Yes. The Popup Modal works on any site that accepts custom HTML — WordPress, Squarespace, Wix, Carrd, Shopify, and custom-built sites.

Will the popup feel intrusive to visitors?

It depends on the trigger. Exit intent and scroll depth (60-70%) both fire after the visitor has already engaged with your content, which makes the popup feel earned rather than forced. Pairing it with a relevant offer improves conversion without being disruptive.

Substack Popup Modal

Q: What triggers are available for the popup?

Three triggers: exit intent (cursor moves toward the browser bar), scroll depth (fires after a visitor scrolls a set percentage of the page), and time on page (fires after a set number of seconds).

A customisable subscribe popup for any website. Triggers on exit intent, scroll depth, or time on page to grow your Substack list.

The Supascribe Popup Modal is a customisable subscribe overlay for any website. Set it to appear on exit intent, scroll depth, or time on page — visitors see a branded subscribe form and can join your Substack list without leaving.

#What It Does

The popup appears over your page when a trigger fires. It shows a subscribe form with your design, headline, and CTA. Visitors enter their email and are added directly to your Substack subscriber list.

Exit intent is the highest-converting trigger for most sites: the popup fires when the visitor's cursor moves toward the browser bar, catching them at the moment before they leave. Unlike an inline form that waits to be noticed, the popup reaches visitors who would otherwise have left without subscribing.

Scroll depth and time on page both target visitors who've already demonstrated engagement — a better audience for a subscribe ask than someone who just landed on the page.

#Triggers

Exit intent — fires when the cursor moves toward the top of the browser window. Reaches visitors at the last useful moment before they leave.

Scroll depth — fires after a visitor scrolls a set percentage of the page. A 60–70% threshold means you're reaching someone who's genuinely read what you wrote.

Time on page — fires after a visitor has been on the page for a set number of seconds. Useful on long-form content where scroll percentage alone doesn't capture reading time.

#What You Can Configure

Design: Set your own brand colours, font, headline text, and button copy. Add an image for visual context. The popup is mobile-responsive by default.

Content: Custom headline, description, and CTA button text. Pair with a lead magnet — a free resource, a curated archive, or a bonus issue — to increase conversions beyond a plain subscribe ask.

Trigger settings: Choose which trigger to use and set the threshold (scroll percentage or time in seconds). Control whether the popup shows again to visitors who've already seen it.