# The best free AI deep-research and document tools 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. ## Stats - 11 tools listed - 10 free or freemium - 6 with no paid plan at all - 1 sub-categories covered ## FAQ ### What are the best free AI deep-research and document tools? 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. ### Which of these are completely free? 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. ### How is this list ordered? 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. ## Quick picks ### Which AI deep-research and document tools work in a browser with no install? 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. ### Which AI deep-research and document tools let you sign in with Google? 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. ### Which AI deep-research and document tools have a mobile app? 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. ### Which AI deep-research and document tools can you self-host or run offline? 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. ## Tools - [MiroThinker](https://aitools.flocci.in/tool/mirothinker) — Free — Deep research agent with up to 300 tool calls per task and 256K context - [STORM (Stanford)](https://aitools.flocci.in/tool/storm-stanford) — Free — MIT-licensed open-source system that researches a topic and writes a full cited report - [Tongyi DeepResearch](https://aitools.flocci.in/tool/tongyi-deepresearch) — Free — 30.5B-parameter MoE agent (3.3B active) with 128K context for long-horizon research - [GPT Researcher](https://aitools.flocci.in/tool/gpt-researcher) — Free — Planner and executor agents gather from 20+ web sources - [ima.copilot (Tencent ima)](https://aitools.flocci.in/tool/ima-copilot-tencent-ima) — Free — AI workbench that searches, reads and writes from a personal knowledge base - [Open Notebook](https://aitools.flocci.in/tool/open-notebook) — Free — Self-hosted NotebookLM alternative over PDFs, video, audio and web pages - [ChatGPT Deep Research](https://aitools.flocci.in/tool/chatgpt-deep-research) — Freemium — Runs up to ~30 min for exhaustive reports - [ChatPDF](https://aitools.flocci.in/tool/chatpdf) — Freemium — Chat with any PDF or document - [Gemini Deep Research](https://aitools.flocci.in/tool/gemini-deep-research) — Freemium — Multi-step research across the web - [NotebookLM](https://aitools.flocci.in/tool/notebooklm) — Freemium — Grounded answers from your own sources - [AlphaSense](https://aitools.flocci.in/tool/alphasense) — Paid — AI search across SEC filings, earnings transcripts, broker research, private data --- Source: Flocci AI Tools — https://aitools.flocci.in/best/best-deep-research-documents Facts last verified: October 2026