The free tier is genuinely useful for simple projects. Pro pays for itself with a single localized release. A freelance designer charges $50-100+ per screenshot set for one language. Localizing 5 languages costs $250-500+. Pro is $12.50/mo for unlimited screenshots in 40+ languages.
Those are general design tools. Screenshot Otter is purpose-built for App Store screenshots, with correct export dimensions, direct store upload, and one-click localization into 40+ languages. No design skills needed.