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 |
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.