IAB LEAN Ads and Coalition for Better Ads​

Contobox is committed to providing great customer experiences in online advertising and is fully compliant with the guidelines provided by IAB Tech Lab’s LEAN Principles and the Coalition for Better Ads. Our ad units, across all formats, support: 

  • A lower number of HTTP requests

  • Small file weight for initial, subload and user initiated load

  • Optimized CPU load

  • Compressed files with Gzip

  • Asynchronous scripts loading

  • User-initiated sound in autoplay videos

  • User-initiated expansion*

  • Adhere to AdChoices principles for Online Behavioural Advertising

  • Delivered over HTTPS protocols

*Contobox ads can support two types of expansion, depending on the publisher requirements. Expansion on click or swipe actions, compliant with the LEAN Ads guidelines. As well as expansion on rollover for three seconds, compliant with the Coalition for Better Ads guidelines.


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3575 St. Laurent, Montreal, QC H2X 2T7


New York

200 Broadway, New York, NY 10007

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