Velin
Velin · Productivity
Velin is an AI research assistant that turns your files into a searchable knowledge base, answers questions from your documents, and cites every claim so you get facts, not guesses.
About Velin
What Is Velin
Velin is a research tool built around retrieval-augmented generation, or RAG. The idea is simple: it acts as a RAG knowledge base for your own files. You upload your files once, and Velin breaks them into searchable pieces and stores them in a private library. When you ask a question, it pulls the exact passages it needs and writes an answer that points back to the page it came from.
Most AI chat tools work a different way. They try to reread every file each time you send a message, which is slow and tends to fall apart on long documents. Velin indexes your files upfront so you can query them again and again across sessions.
The main tradeoff is scope. Velin is a document analysis tool, not a general chatbot or a writing assistant. It shines when your answers live in PDFs, spreadsheets, and manuals, and it works best when you keep that library organized.
Getting Started
- Create a free account at velin.ai and open a new workspace, called a stack.
- Upload your sources as PDF, text, Excel, or CSV files, or add a YouTube link.
- Pick which files are active in the current session so Velin knows what to search.
- Ask a question in plain English and read the answer, with links back to the source pages.
- Keep files in your library so you can query them again in any future session.
Product Information
A quick look at Velin's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- Researchers and analysts
- Legal and compliance teams
- Students and writers
Tasks
- Cross-document synthesis
- Reviewing long manuals
- Turning spreadsheets into answers
Scenarios
- Early project research
- Due diligence review
- Course or study prep
Key features
Retrieval-Augmented Generation
Velin indexes your files into neural vectors and stores them in a permanent, private knowledge base. When you ask a question, it retrieves the passages that match rather than rereading everything. That is why it stays fast and accurate on large libraries, and why it keeps working the same way in every new session, letting you chat with your PDFs as easily as with a short note.
Cited Answers
Every answer comes with links to the exact pages in your library, so you can check a claim before you trust it. These cited AI answers are the feature that separates Velin from tools that generate smooth responses with no trail back to the source. For work where being wrong is expensive, the citation is the point, and it is what sets a hallucination-free AI tool apart from a confident guesser.
Lossless Document Ingestion
Velin handles batch uploads of hundreds of files at once and processes thousand-page documents, million-row spreadsheets, and mixed formats without you babysitting the queue. It documents rates up to 4.8MB per second on its pipeline. Standard chat tools tend to slow down or lose track of details once a document gets long.
Multi-Format RAG
The library accepts text, PDF, Excel, CSV, and video, plus YouTube links, so you are not limited to plain text. The Unlimited Plus plan adds MP4 and YouTube processing for when the answer lives in a recording rather than a document. That range covers the messy mix of formats most real projects actually use.
Permanent Knowledge Library
Files you ingest stay in your library and can be queried forever, across all your sessions. Velin pricing starts low and scales with you: on a Starter plan you can keep up to 100 files, while the Unlimited and Unlimited Plus plans remove that ceiling. This is the difference between a one-off chat and a workspace you build up over time.
Fast and Pro Modes
Velin splits its thinking into two modes. Velin Fast answers quickly for everyday lookups, while Velin Pro uses heavier reasoning for complex tasks and takes longer in exchange for higher-quality answers. You switch modes based on how much the question matters, not on which plan you are on.
Web Search Grounding
When your library does not hold the answer, Velin can pull in grounded web search results to fill the gap. Web search is disabled while RAG is running so your documents stay the primary source, and you can turn it back on for the questions that reach beyond your files.
Pros and cons
Pros
- Answers point to specific pages in your files, so you can verify every claim instead of taking the model's word for it.
- Handles very large inputs, including 1,000-plus page documents and libraries of 100 or more files, which is where ordinary chat tools break down.
- Files stay indexed across sessions, so a library you build once keeps paying off instead of being trapped in a single chat.
- Supports text, PDF, Excel, CSV, video, and YouTube, covering the mixed formats real research actually uses.
- Starts on a free plan, so you can test the workflow before paying.
Cons
- The Core plan caps active files at 3 at a time, which can be tight if you need to reason across many documents at once.
- Video and YouTube analysis sits behind the $100 per month Unlimited Plus plan, so that capability is out of reach on cheaper tiers.
- It is a research and document tool rather than a general writing or coding assistant, so it will not replace the chat app you use for everything else.
- It runs in the browser only, with no desktop or mobile app for offline use.
Frequently asked questions
Velin turns your documents into a private, searchable knowledge base and answers questions from your documents with citations to the exact pages. It is built for research and document analysis, not general chat.
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