The most important distinction with AI writing tools for students isn't which is most powerful — it's which ones improve your writing versus which ones do the writing for you. The first category is fine at most schools; the second is plagiarism at nearly all of them.
For general help: ChatGPT Plus
ChatGPT Plus at $20/month is a strong general-purpose option for students, with a Study Mode that walks through problems step-by-step instead of just handing over answers, plus the ability to upload PDFs and slides and ask questions directly about them.
For grammar and editing: Grammarly
Grammarly remains the most widely used AI writing tool among students, and most universities treat it as equivalent to spell check — explicitly permitted rather than flagged as academic dishonesty. QuillBot serves a similar role: paraphrasing for clarity, grammar and spelling checks, summarizing long texts, and formatting citations correctly.
For research: NotebookLM and Perplexity
NotebookLM is built for source-grounded research — it answers only from documents you've uploaded, so it can't fabricate facts the way a general chatbot sometimes can. Perplexity is similarly strong for research because every answer comes with cited, verifiable sources. See our Perplexity pricing guide — the new $10/month Education Pro tier is worth checking if you're a verified student.
For lecture notes: Otter.ai
Otter.ai records and transcribes lectures in real time, producing a searchable, timestamped transcript plus an automatic summary — a genuine time-saver when revising for exams.
| Need | Tool | Academic risk |
|---|---|---|
| General Q&A / study help | ChatGPT Plus | Low if used to check understanding, not generate final work |
| Grammar/editing | Grammarly, QuillBot | Very low — treated like spell check at most schools |
| Source-grounded research | NotebookLM, Perplexity | Low — citations make sourcing transparent |
| Lecture transcription | Otter.ai | None — it's a recording tool, not a writing tool |
Frequently asked questions
Is it cheating to use ChatGPT for homework?
It depends on how you use it and your school's specific policy. Using ChatGPT's Study Mode to check your understanding or have a concept explained is treated like a tutor at most schools. Submitting AI-generated text as your own original work is plagiarism almost everywhere. When in doubt, check your syllabus or ask your instructor.
Will professors know if I used AI to write my essay?
AI detection tools exist, but they aren't fully reliable -- they can miss AI-generated text and sometimes flag human writing. The safer approach is using AI for editing and research rather than generating your final submission.
Is Grammarly considered AI writing, and is it allowed at school?
Most universities treat Grammarly as equivalent to spell check rather than AI-generated writing, since it corrects and suggests rather than writing content for you -- one of the lowest-risk AI tools a student can use.
What's the best free AI tool for students?
Grammarly and QuillBot both have solid free tiers for grammar and paraphrasing. NotebookLM is free and source-grounded for research, and Perplexity's free tier includes 5 Pro searches a day. ChatGPT's free tier covers general Q&A, though Study Mode and file uploads require the $20/month Plus plan.
Is Perplexity free for students?
Perplexity's standard Pro plan is $20/month, but verified students can get Education Pro for $10/month -- the same feature set at half price. See our Perplexity pricing guide for the full breakdown.
Can NotebookLM make up facts like ChatGPT sometimes does?
No -- NotebookLM only answers from documents you upload, so it can't fabricate facts the way a general-purpose chatbot can. That source-grounding is why it's useful for research where accuracy matters.
The bottom line
Build a toolkit around editing and research support rather than output generation: Grammarly or QuillBot for polish, NotebookLM or Perplexity for sourced research, Otter.ai for lecture capture, and ChatGPT's Study Mode when you need something explained rather than written for you.