This does one magic trick better than anything else: you drop in PDFs, docs or links and it generates a two-host audio show about *your* material. It only talks about the sources you gave it, so it doesn't wander off and invent things. Best free research tool on this list.
Three audio generations a day is the real ceiling — enough to work with, not enough to batch. And it won't go beyond your sources; that's the feature, not a bug.
| What you get free | 100 notebooks, 50 sources each (500,000 words each), 50 chat queries and 3 audio generations per day — free |
| Where the limit sits | Daily caps on chat queries and audio generations; upgrading raises them |
| Credit card to start | No |
| Pricing type | Free tier |
| Last checked | 2026-07-30 · source |
| Platforms | web |
| Category | Research & search · Audio & voice |
We recheck every entry. Subscribers hear first when a free tier quietly shrinks.