You don't need a paid subscription to get serious value from AI. Several of the most useful AI tools have free tiers that cover the majority of real use cases. Here's an honest guide to what's worth using — no tools included that are technically free but useless in practice.
NotebookLM (Google) — Completely Free
Upload PDFs, reports, articles, YouTube transcripts. Ask questions across all of them. Answers cite the source document. Generate audio overviews.
Why it's worth using: Nothing else does cross-document synthesis this well. Upload five industry reports and ask "what are the conflicting conclusions?" It's excellent and free.
Claude (Free Tier)
Access to a capable model with daily usage limits. Good for single tasks — drafting, summarising, answering specific questions. The writing quality on the free tier often exceeds paid tiers of other tools.
Limitation: Not the most capable model; rate limited. But if AI use is occasional, often sufficient.
Perplexity (Free Tier)
Unlimited searches with real-time web access and citations. The free tier covers most research use cases entirely.
Limitation: Rate-limited on pro model queries.
The Free Stack That Works
- Perplexity — research questions
- NotebookLM — synthesising documents you've collected
- Claude — drafting and one-off tasks
This covers 80% of what most knowledge workers need from AI — at zero cost. When the free limits start to bite regularly, the paid tiers pay for themselves within days.