Comparison
Rigorous Reasoning vs. Brilliant
Brilliant is a well-designed general STEM platform with a logic section among many other subjects. Rigorous Reasoning only teaches structured reasoning. Here's what that difference actually looks like.
Primary focus
Logic and structured reasoning — exclusively.
General STEM: math, science, computer science, data analysis, with logic as one track among many.
Logic coverage depth
8 reasoning domains: foundations, propositional logic, categorical logic, fallacies, inductive, abductive, Bayesian, predicate logic, problem-solving.
Introductory logic puzzles and set-theory tracks; less formal depth on fallacies, Bayesian reasoning, or free-text argument analysis.
Feedback on free-text responses
Every written answer gets rubric-scored feedback (strengths, weaknesses, next step). Optional AI rewriting for pedagogical prose.
Primarily multiple-choice / interactive puzzles. Less focus on free-text argument writing.
Spaced repetition
Built-in SM-2 review queue across everything you've studied.
Not a core feature.
Adaptive recommendations
Per-unit adaptive engine that recommends skip, advance, review, focus, or explore based on your performance profile.
Sequenced course paths; less granular per-unit adaptation.
Instructor / classroom mode
Courses, assignments, rosters, gradebook CSV export, join codes.
Primarily consumer-facing; classroom tools are not the product.
Free tier
Foundations unit + first lesson of each other unit + full diagnostic + 5 AI-feedback uses / month.
Free tier exists but most content requires Premium.
Paid tier pricing
See our pricing page.
Brilliant Premium is billed annually; check brilliant.org for current pricing.
Information about Brilliant is based on publicly available content on brilliant.org as of 2026. We're not affiliated with Brilliant. Their platform is excellent for what it does — we just do one thing instead of many.
Try it free
See how logic feedback actually feels.
Ten-minute diagnostic, no card required. You'll see the rubric engine evaluate your reasoning and point you at your weakest domain.