18/08/2026
🦈 Australia's community shark sighting and alert network is opening its Expressions of Interest on Birchal.
Since 2015, Dorsal has been collecting and verifying shark sightings from the public, official sources, and aerial and in-water detection technology, then pushing verified alerts out to surfers, swimmers, families and locals in moments. More than 500,000 people have downloaded the app, which holds a 4.6 rating on the App Store and 4.7 on Google Play. Over summer 2025/26, Dorsal was the number two sports app in Australia, just behind the Australian Open.
Dorsal has built this reach without paid acquisition, through a genuinely passionate community: over 627,000 social followers, 255,000 email subscribers, and 150 million views across its Facebook channels in 2025. Every sighting reported to the platform is verified by a human before it goes live.
Dorsal has never taken outside investment. Expressions of Interest open now on Birchal, funding the next stage: drone-direct reporting, in-water smartwatch alerts, and a stronger verification pipeline underneath both.
Register your interest to help build what's next for ocean safety
-> birchal.com/company/dorsal
Always consider the general CSF risk warning and offer document before investing.