iPhone Screenshots


Seaweed Sorter helps users identify more than 110 species of macroalgae commonly found along the west coast of British Columbia, Canada, including many species that extend from Alaska down to Washington, Oregon, and northern California.

Unlike printed dichotomous keys, which use jargon and often require specialized knowledge, Seaweed Sorter uses easy-to-understand, illustrated questions that assume no prior knowledge and allows users to skip questions at any time.

Seaweed Sorter includes more than 250 photos, current and former names, taxonomic details, clear morphological and ecological descriptions, and lists of other seaweeds that “could be confused with” your specimen – all curated by Dr. Patrick Martone (Professor of Phycology, UBC). Books can be quickly out-of-date, but Seaweed Sorter content will be updated frequently with taxonomic revisions, additional photos, new species, and more. Plus, content is available anytime and doesn’t require an internet connection, making Seaweed Sorter an excellent companion on any trip to the coast.

Great for educators, students, consultants, and naturalists!

What’s New

Version 20.1.12

Happy new year, seaweed-lovers! This update includes:
- 3 new species (Lomentaria hakodatensis, Caulacanthus ustulatus, Griffithsia pacifica)
- 2 new questions to help refine your search
- Updated Xcode to ensure full screen (instead of "modal") presentation
- Updated data file, including accounting for the fact that Gelidium can appear reddish (thanks, Megan Fass!)
** Please review the Seaweed Sorter on the App Store, and happy seaweed hunting!

Ratings and Reviews

5.0 out of 5
8 Ratings

8 Ratings

awckr ,

FANTASTIC resource for anyone who’s ever been near a tide pool

This is the by far the best resource (app, book, website or otherwise) for quick, accurate, in situ identification of all the species of algae in the Pacific Northwest.

Trips to the shore have been completely transformed for my family since being able to confidently figure out what everything is we’re looking at.

Whoever built this is clearly both an expert in what they’re doing, but also clearly passionate and have managed to make a beautiful, useful, and incredibly value resource for all us couch potato scientists.

Invaluable for us on Vancouver Island!


Patrick Martone
147.1 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad and iPod touch.



Age Rating


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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