Every option in the catalog for when you need to read a pile of sources and get a grounded report — 11 AI deep-research and document tools, 10 of them free or freemium, with the pricing tier printed on every row.
Flocci AI Tools lists 11 of them, ordered free tiers first: MiroThinker, STORM (Stanford), Tongyi DeepResearch, GPT Researcher and ima.copilot (Tencent ima). 10 of the 11 are free or have a free tier. Each entry states what it uniquely does rather than a score.
6 on this page are marked fully free with no paid plan at all: MiroThinker, STORM (Stanford), Tongyi DeepResearch, GPT Researcher and ima.copilot (Tencent ima). The remaining 5 are freemium, trial or paid, and each is labelled with its exact tier so nothing surprises you at sign-up.
Free tools first, then freemium, then trial, then paid, and alphabetically inside each tier. Nobody pays to appear higher: Flocci AI Tools carries no ads, no sponsored slots and no paid listings, so the order reflects price and nothing else.
MiroThinker, STORM (Stanford), Tongyi DeepResearch, ChatGPT Deep Research and ChatPDF all work in a browser tab with no install needed — just open the site and go. 7 of the 10 free AI deep-research and document tools listed here are browser-based.
ChatPDF and Gemini Deep Research support Google sign-in, so you can start without creating a new account. That's 2 of the 10 free AI deep-research and document tools on this page.
ima.copilot (Tencent ima), ChatGPT Deep Research, ChatPDF, Gemini Deep Research and NotebookLM have an iOS or Android app. 5 of the 10 free AI deep-research and document tools here can run on your phone.
GPT Researcher and Open Notebook can be self-hosted or run locally without a browser — useful for privacy, air-gapped networks, or avoiding API rate limits. 2 of the 10 free AI deep-research and document tools here run offline.
| Tool | Pricing | Type | Listed for |
|---|---|---|---|
| MiroThinker | Free | Deep Research & Documents | Deep research agent with up to 300 tool calls per task and 256K context |
| STORM (Stanford) | Free | Deep Research & Documents | MIT-licensed open-source system that researches a topic and writes a full cited report |
| Tongyi DeepResearch | Free | Deep Research & Documents | 30.5B-parameter MoE agent (3.3B active) with 128K context for long-horizon research |
| GPT Researcher | Free | Deep Research & Documents | Planner and executor agents gather from 20+ web sources |
| ima.copilot (Tencent ima) | Free | Deep Research & Documents | AI workbench that searches, reads and writes from a personal knowledge base |
| Open Notebook | Free | Deep Research & Documents | Self-hosted NotebookLM alternative over PDFs, video, audio and web pages |
| ChatGPT Deep Research | Freemium | Deep Research & Documents | Runs up to ~30 min for exhaustive reports |
| ChatPDF | Freemium | Deep Research & Documents | Chat with any PDF or document |
| Gemini Deep Research | Freemium | Deep Research & Documents | Multi-step research across the web |
| NotebookLM | Freemium | Deep Research & Documents | Grounded answers from your own sources |
| AlphaSense | Paid | Deep Research & Documents | AI search across SEC filings, earnings transcripts, broker research, private data |