It's 11pm, your pathophysiology tutorial is at 9, and you still can't explain why heart failure makes someone's ankles swell. Your tutor is asleep. Office hours were on Tuesday. So you open an AI chat and type the question, and it answers in three seconds. The answer is good. You nod along. Then you close the tab, and by morning you couldn't explain it to anyone.
That's the thing to judge an AI tutor on. The best AI tutor for a uni student is the one that makes you do the thinking and sticks to what your course actually teaches. For explaining anything at all, ChatGPT, Claude and Gemini are all excellent and all have a free tutoring mode. For questions answered strictly from your own readings, NotebookLM. For being taught and then tested on each week's lecture, with the questions you missed coming back later, that's what I build The Study Mill to do, so weigh my opinion accordingly.
What makes an AI a good tutor (and not just a good answer machine)
A human tutor rarely just tells you the answer. They ask what you already think, let you get it wrong, then nudge. That's slower, and it's annoying at 11pm, but it's why tutoring works. Producing an answer yourself builds memory in a way reading someone else's answer doesn't. That effect, retrieval practice, is one of the most reliable findings in learning research. Why rereading feels better than it works.
So when I compare these, I'm asking four things. Does it make you think before it tells you? Does it stick to your course, or drift into the textbook version? Does it remember what you struggled with last week? And will it be right about the specifics your exam marks?
The general chatbots, in tutor mode
All three big chatbots now have a mode built for learning. You switch it on, and instead of handing you the answer, the AI asks guiding questions and checks your understanding as you go.
ChatGPT Study mode
Pick "Study and learn" from the tools menu and ChatGPT stops lecturing and starts asking. It's available on the free plan, with lower message limits than paid plans. ChatGPT Plus is around US$20 a month at the time of writing.
It's the most flexible explainer here. Ask for the Frank-Starling mechanism as an analogy, then as a diagram description, then as a one-line summary, and it'll keep going until one lands. It's also strong on worked problems in statistics or accounting, though it can slip on arithmetic, so check the working.
The catch: Study mode is easy to switch off when you're tired, and the regular mode will happily do your thinking for you. It also doesn't know your course unless you give it your slides, and even then it drifts toward the general version of a topic. Prompts that keep ChatGPT useful for study.
Claude with the Learning style
Claude has a "Learning" option in its style menu. It started inside Anthropic's university plan and was opened up to everyone in 2025. It's Socratic in the same way: it asks what you think, then builds from your answer.
In my experience Claude is the best of the three at long, careful explanations and at pushing back gently when your reasoning has a gap. That makes it good for essay-heavy subjects like law and psychology, where how you argue matters as much as what you know. The free plan has a usage cap that resets over time, and a long session can hit it. Pro is around US$20 a month at the time of writing.
Gemini Guided Learning
Google's version is called Guided Learning, and it's in the free Gemini app. It leans on visuals more than the other two, pulling in diagrams, images and short videos, and it can turn a topic into a quick quiz or flashcards. For visual subjects like anatomy, that helps. Google has also run free paid-plan offers for students in some countries, including Australia, so check whether one is open where you are.
Khanmigo: a real tutor, built for school
Khanmigo is Khan Academy's AI tutor, and it's the most disciplined of the lot about not giving answers away. It was designed with teachers and it shows. Several sources put the consumer price at around US$4 a month, but at the time of writing it needs a US billing address.
For uni, it's a mixed fit. It's at its best on maths and science up to first-year level. Once you're into third-year pharmacology or contract law, it isn't built for that depth, and it doesn't work from your own lecture material.
NotebookLM: the tutor that only read your readings
NotebookLM isn't sold as a tutor, but a lot of students use it as one. You upload your slides and readings, and it answers only from those, with citations to the exact page. That's the big advantage over the chatbots: it explains your course the way your course taught it. The trade-off is that it won't reach outside your sources for a clearer analogy. NotebookLM vs ChatGPT for studying goes into which to use when.
Where The Study Mill fits
I build this one, so here's what it does and where it doesn't compete.
The Study Mill starts from your material, not from a chat box. You upload each week's slides, PDF, Word doc, photos of handwritten notes or the lecture recording, and it turns the week into short lessons with analogies, flashcards, notes and a quiz that mixes multiple choice with written answers marked by AI. There's a tutor you can ask when something doesn't click, and it answers from that week's material. Walk & Learn has two hosts, Milli and me, teach the week as audio and then ask you questions you answer out loud.
The part the chatbots don't do is remember. Questions you get wrong come back in a daily review, and if you set an exam date, it plans revision around your timetable. A chatbot tutor session is brilliant for one concept on one night. It won't bring that concept back three days later when you're about to forget it.
Where it's weaker: it's not the tool for "explain anything in the world". If a concept isn't in what you uploaded, ChatGPT or Claude will do better. Free covers 2 classes. Pro is A$7.99 a month or A$49 a year and adds unlimited classes, exam mode and cram sheets, and students with a .edu or .edu.au email get 50% off.
Side by side
| Makes you think first | Sticks to your course | Remembers what you missed | Free to start | |
|---|---|---|---|---|
| ChatGPT Study mode | Yes, if you leave it on | Only if you upload, and drifts | No | Yes, with limits |
| Claude Learning style | Yes | Only if you upload | No | Yes, with limits |
| Gemini Guided Learning | Yes | Only if you upload | No | Yes |
| Khanmigo | Yes, strictly | No | Not for your course | No |
| NotebookLM | Partly, via quizzes | Yes, with citations | No | Yes |
| The Study Mill | Yes, quizzes and spoken questions | Yes | Yes, daily review | 2 classes |
Which one should you use?
If you're stuck on one idea tonight, use whichever chatbot you already have, in its learning mode, and paste in the relevant slide so it stays close to your course. Claude if you want careful reasoning, Gemini if you want pictures, ChatGPT if you want lots of angles.
If you need to check what your lecturer actually said, use NotebookLM.
If the problem is that you understood it in week 3 and can't remember it in week 12, no chat tutor fixes that on its own. You need something that tests you on a schedule. Try The Study Mill on one lecture: upload it, do the quiz, and see what comes back in tomorrow's review.
This is general study advice. Other apps' prices and features are as published in October 2026 and change often. Check their own pricing pages.