Caktus

Caktus AI is an AI study platform built specifically for students. It brings together more than 25 tools in one place: an essay writer that includes real citations, a step-by-step math and science solver, a research assistant, flashcard and study-guide makers, paraphrasing and more.

Instead of a single general chatbot, each tool is tuned for a specific school task, which makes it faster to go from a blank page to a finished draft or a solved problem with explanations. Caktus positions itself around academic integrity, with features that help students understand and cite their sources. The company says more than 3 million students use it.

Good fit if you: are a high-school or university student who wants AI help with writing, math, science and studying in one place.
Less ideal if you: plan to submit AI-generated work unchanged; check your school's rules on AI use and use Caktus to learn, not to cheat.

Pricing: you can sign up and try it; full access requires a paid subscription.