David and Marek's earlier work was running a small web agency, chasing new client contracts where a visually strong pitch was their edge. Needing a handful of iPhone mockups for one such pitch and finding nothing online that fit, they shot their own with a DSLR in the park across from their office and released four of them free on Dribbble in 2014.

“our beginnings are in the field of web agencies. We were constantly trying to get new clients and sign contracts.”

The first people to use a Mockuuups mockup were the Dribbble community who reacted to the four free shots David and Marek posted in 2014, years before any paid product existed.

“we released four on Dribbble and the community loved them with over 10K responses”

About Us ties the first paying customers to the 2016 launch of the Mockuuups Studio app itself, which is where the record's own first_customer milestone points. The founders do not spell out exactly who bought first, but the app launched into an audience they had already built through two years of free Dribbble shots and PSD downloads, so existing_audience is our reading rather than a separately stated fact (see record discrepancies for a complication with this dating).