Seaweed Sorter 4+

Pacific Northwest edition

Patrick Martone

Designed for iPhone

    • 5.0 • 10 Ratings
    • $5.49

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 Books can be quickly out-of-date, but Seaweed Sorter content will be updated frequently with taxonomic revisions, additional photos, new species, and more.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 22.01.16

Happy new year, seaweed lovers! New species added: Gelidium purpurascens! A tricky little seaweed that can be confused with Gelidium coulteri. Hope these photos and description clear it up! Big thanks to Mike Chung and Hannah Levit for bringing this to our attention.

Remember to click "?" on the homescreen to submit problems and suggestions. And please rate us in the App Store!

Ratings and Reviews

5.0 out of 5
10 Ratings

10 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!

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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