Seven formats.
One tag.
Display, Native, In-Image, Video, Slider, Ad Wall and NewsReader. Each one is built for a different reader moment, and all of them run from the same Keystone tag. Turn them on, tune them or pause them without touching your site.
Display
Standard IAB display units in your articles and layout, delivered and managed through the same tag as every other format.
Standard IAB sizes for desktop and mobile layouts
Placed where they fit your layout and perform best, set up by your Babel team
Blocked pages and page rules apply automatically
300×250 · the most common IAB size
Video player
We place a partner video player in your article, wherever you choose, and manage it from the same tag.
Video players from leading partners, or your own custom player
Placed wherever you choose in the article
No video library of your own required
In-article video player
Native
Ads that match the look of your editorial content, in feeds and in articles, managed from the same tag.
Designed to sit naturally in your layout
In-article and in-feed placements
Page rules and blocked pages apply, like every other format
Clearly labeled as sponsored, to keep your readers' trust
In-feed native card
Slider
A corner card that slides in once the reader starts scrolling. It plays a VAST video first and falls back to multisize display.
Video first (VAST via Google IMA), with display as the fallback
Refreshes only while it's actually in view, cross-checked with Google Ad Manager's own viewability signal. A refreshed card keeps its size and never jumps
Corner, margins and video width set per device, plus a close button and frequency cap
Header bidding built in: Prebid video and display auctions are rolling out on the Slider first
Corner card · video first, display fallback
In-Image
Your editorial photos become ad inventory without covering the story. You choose which images can carry ads, and ads always fit the image.
Include and exclude rules: for example, only images in the article body, never galleries or recommendation widgets
Only requests ad sizes that fit the image natively
Monetizes image-heavy pages that have few traditional ad slots
Clearly labeled as an ad
In-Image · sized to fit the image
NewsReader
An AI-written audio summary of each article, read aloud in a natural voice. Readers unlock it by watching a rewarded ad.
Summary and voice generated by AI, in the article's language
Voice, accent and language chosen per site
The listen button appears only once the article's audio is ready
Listen to a summary
1 min · NewsReader
Watch a short ad to unlock the audio
NewsReader player
Ad Wall
A rewarded gate placed after a paragraph of your article. Readers watch a short ad to unlock the rest, or subscribe. You get rewarded demand and a new way into your subscription funnel.
Your colors, logo, copy and subscribe link
Frequency controls: start from a given pageview in the session, and cap walls per session or per number of hours
Subscribe clicks and sign-ups are tracked, so you can see what the wall does for subscriptions
Optional AI-written hook for each article, in the article's language, so the wall feels relevant to what readers are about to unlock and they're more likely to engage
Ad Wall · rewarded content gate
Start with
one tag
Tell us which formats fit your site. We configure them, you preview them on your own pages, and you install one script.