The best scroll box software of 2026

Convertful lists scroll boxes as one of six widget types, next to pop-ups, floating bars, full-screen welcome mats, inline widgets and floating buttons, so you can build the slide-in and the rest of your sign-up forms in one account. The page scroll trigger takes either pixels or a percentage of page height. That lets you show a box at 60% of a long article and after 300 pixels on a short product page. You can also trigger on exit intent, time on page, inactivity or a click on a page element, and narrow the audience by visit source, pages viewed, country or screen width.

The reason to pick Convertful over the cheaper tools here is account-based targeting. It reads the tags, lists and custom fields in your email platform (ActiveCampaign, Kit, Klaviyo, Mailchimp, HubSpot and Platformly among them), so a reader who already took your checklist can see a different offer in the same spot. On WordPress sites it can also target by post category, post type and visitor tag, which suits a blog that wants one scroll box per topic.

The Solo plan costs $9 a month, or $84 a year, for 10,000 pageviews on one site, but it keeps Convertful branding and leaves out CRM sync and A/B tests. Starter, at $29 a month or $17 a month billed yearly, removes the branding and adds the CRM sync that tag targeting needs. Every plan starts with a 14-day trial.

Getsitecontrol builds each widget from a template, and you can switch any template to its slide-in type, which slides in from an edge of the screen without covering the page. Its own guidance recommends a slide-in for newsletter sign-ups and for recommending a product while people browse.

The scroll trigger shows the widget once a visitor has scrolled a set percentage of the page. Getsitecontrol can also hide a widget again when the visitor reaches a second scroll depth, which is handy for a box that should disappear before your footer or comments. Other triggers cover exit intent, time on page, time on site and inactivity, and Shopify stores get add-to-cart and remove-from-cart triggers.

The catch is that every trigger, and visitor targeting by country, device or referrer, needs the Pro plan. The free plan gives you 10,000 widget views a month, but its widgets show as soon as the page loads. Pro costs $19 a month per site for 100,000 views, and Pro Max costs $29 a month for unlimited views. Getsitecontrol also includes its own email tool, billed separately at $1.60 per 1,000 emails on Pro, and it connects to Klaviyo, Mailchimp, MailerLite, ActiveCampaign, Brevo, Omnisend and GetResponse.

OptinMonster calls its scroll boxes slide-ins. By default one scrolls up from the bottom-right corner, and you can move it to another position. Its most useful extra is a minimized state: when a visitor clicks close, the slide-in shrinks to a small teaser instead of disappearing, so they can reopen it later. The scroll distance display rule decides how far down the page it appears, and you can combine it with OptinMonster's other rules, such as referrer detection, page-level targeting, geolocation and onsite retargeting.

Two warnings from OptinMonster's own help pages matter for this format. The scroll rule doesn't work correctly on pages with infinite scrolling or pages whose length changes as they load. And on phones, OptinMonster recommends hiding slide-ins and showing a mobile pop-up instead, because a tall slide-in anchored to the bottom of a small screen can push its close button out of reach.

The library has more than 700 templates and over 50 integrations. The WordPress plugin has more than a million active installs, though it needs an OptinMonster account to work, and OptinMonster also supports Shopify, Wix, Squarespace and any HTML site. Prices on the pricing page are first-year rates billed yearly. Basic is $9 a month ($108) for one site and 2,500 impressions, then renews at $210 a year. Exit intent starts on Pro.

Poptin's slide-in appears from the side or a corner of the screen while people browse. Its page scroll trigger fires when a visitor has scrolled a set distance or has reached an element you choose, such as the end of an article or a pricing table. That element option helps on pages where a percentage would land in a different place on desktop and on a phone. Poptin also has exit-intent, time-delay, inactivity, on-click and page-count triggers, and A/B testing appears on every plan in its comparison table.

The free plan covers 1,000 visitors a month on one domain with unlimited poptins, which is enough to test a slide-in on a small blog before you pay. It keeps a "Powered by Poptin" credit on your boxes. Basic removes that and raises the limit to 10,000 visitors for $20 a month billed yearly, or $25 month to month. Poptin lists more than 70 native integrations and works with WordPress, Shopify, Wix, BigCommerce, Weebly and Ecwid. It also sells an email plan with its own free tier if you don't have an email platform yet.

Thrive Leads is a WordPress plugin with every common opt-in type, and its slide-in slides into view from a corner of the screen. You can show forms on scroll triggers or on a click, and choose exactly where on your site each form appears. The feature that suits scroll boxes best is SmartLinks: Thrive Leads can hide a form from people who already subscribed, or show them a different offer, so regular readers stop seeing the same sign-up box on every post. Its built-in A/B testing compares designs and wording.

You can't buy Thrive Leads on its own. It comes in Thrive Suite, a bundle of nine Thrive plugins. The suite costs $299 for the first year, then renews at the full price of $599 a year, or $149 a quarter, and one license covers up to five websites. If you stop paying, your existing forms keep working, but updates, support and premium templates stop. That makes it good value if you already use Thrive's other tools, and expensive if you only want a slide-in.

Popup Maker is a free WordPress plugin with more than 600,000 active installs and a 4.9 out of 5 rating from 4,515 reviews on WordPress.org. It can build slide-ins as well as centered pop-ups and banners, with slide and fade animations for the entrance and exit. The free plugin opens a box after a delay or when someone clicks a button or link. The scroll trigger, which is what turns a slide-in into a scroll box, comes with Popup Maker Pro, along with exit intent, split testing and advanced targeting by user role and schedule.

Pro lists at $99 a year for one site, and the pricing page showed a first-year price of $59.40 on November 4, 2026. Pro+ adds revenue tracking and WooCommerce and Easy Digital Downloads targeting for $249 a year. The free plugin is a sensible way to design and test your box on a timer, then pay for Pro once you know where on the page it should appear.