Tallywell.

Spirulina (dried) vs Whey protein (dry)

Spirulina (dried) counts toward 30 plants a week; Whey protein (dry) doesn't.

Spirulina (dried)Whey protein (dry)
Protein · per 100 g57.5 g78.0 g
Fiber · per 100 g3.6 g0.0 g
Energy · per 100 g290 kcal385 kcal
Protein · per 100 kcal19.8 g20.3 g
To hit 30 g protein52 g · 151 kcal38 g · 148 kcal

Bold marks the better side of each row. "Per 100 kcal" answers the density question — which food delivers more protein for the energy it costs. Portion row is computed live from the same USDA base values shown on each food page.