Boddle vs Principia

Boddle is a K–6 learning game with math, English language arts, and science content for classrooms, families, and homeschoolers. Its learning roadmap adjusts material to a learner's performance. Student tools include text-to-speech, question explanations, a sketch scratchpad, and placement testing. Teachers can assign standards-aligned skills and review mastery reports by student, skill, and standard. Google Classroom and Clever provide single sign-on and roster syncing. The premium page describes more than 2,000 skills and over 48,500 questions, rationales, and explainer videos. Boddle says its full learning platform is free for every teacher and school, with Premium as an optional add-on. The Basic plan includes all learning content and more than 35,000 questions for students. Listed Premium prices are $4.08 per month billed annually and $9.99 per month billed monthly. Boddle runs in web browsers on Chromebooks and laptops, with iOS 12+ and Android 9+ apps. It states that it complies with COPPA, FERPA, and SOPPA and holds KidSafeSeal certification.

Principia has no write-up on Specifiction yet; its figures are above.