Seaweed Sorter 4+

Pacific Northwest edition

Patrick Martone

Designed for iPhone

    • 5.0 • 7 Ratings
    • $3.99

iPhone Screenshots


Seaweed Sorter helps users identify more than 120 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 Books can be quickly out-of-date, but Seaweed Sorter content will be updated frequently with taxonomic revisions, additional photos, new species, and more.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 23.09.05

Major update, seaweed-lovers!
Added 5 new species: Ahnfeltia fastigiata, Fredericqia chiton, Fredericqia decewii, Gracilariopsis andersonii, Gracilaria sp.
Added 2 new questions for species found on sandy beaches or in mudflats
Updated name for Macrocystis tenuifolia (!)
Updated code to ensure questions were parsed correctly, with unhelpful questions discarded

Ratings and Reviews

5.0 out of 5
7 Ratings

7 Ratings

Jayammon ,

Thanks for the algae identification resource!

I'm just starting out, as a researcher in algae, so I'm not familiar with the specimens, and a lot of published academic literature is lacking, as far as library resources. I'm glad to have access to an app like yours, for learning about the ocean life and organisms.

App Privacy

The developer, Patrick Martone, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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