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 Books can be quickly out-of-date, but Seaweed Sorter content will be updated frequently with taxonomic revisions, additional photos, new species, and more.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 20.12.10

Happy holidays, Seaweed-Lovers! This is a substantial update that will improve the basic usability of the Seaweed Sorter. Thank you for all the fantastic feedback!
Nuts & Bolts updates
-- Homescreen now fills the entire screen of the latest iPhone models (very slick!)
-- Fixed a "dark-mode" error that improves the overall look of the app
-- Fixed a screen rotation error that caused the app to reset
-- Updated the sorting logic to help tease apart more subtle differences in species

Data updates
-- Added 4 new illustrated questions, and removed one redundant question
-- Refined the wording in a two questions
-- Improved the data for Bangia and Rhodymenia

Ratings and Reviews

5.0 out of 5
6 Ratings

6 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

    With Family Sharing set up, up to six family members can use this app.

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