> ## Documentation Index
> Fetch the complete documentation index at: https://rapidreview.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# What is Nisa

> A map of 500,000+ arXiv ML papers, a research agent that searches, reads, and writes over it, and a CLI that brings both to your terminal, your files, and your coding agents.

Nisa indexes more than 500,000 arXiv machine-learning papers — the **corpus** — and lays them out as a navigable map: position by content, colour by community in the citation-and-similarity graph, the highest-PageRank papers visible first and more as you zoom. A research agent works over the same corpus.

| Surface                                                          | For                                                                                                                                                                        |
| ---------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Web app** — [rapidreview.io/nisa](https://rapidreview.io/nisa) | Explore the map, open a paper and its similar papers, search, save and share lists. [Web app](/docs/nisa/guides/web-app)                                                        |
| **Web chat** — `⌘K`                                              | Ask the agent: it searches, reads papers, follows citations, runs code, writes reports; share a chat with a colleague. [Web chat](/docs/nisa/guides/web-chat)                   |
| **`nisa` CLI**                                                   | Look papers up from a shell, chat with the agent in the terminal, and connect a local folder so the agent can read your PDFs and notes. [Install](/docs/nisa/start/install)     |
| **Coding agents and scripts**                                    | Install the Nisa skill and your agent runs the same lookups itself, headless, with an API key. [Install → the skill](/docs/nisa/start/install#give-your-coding-agent-the-skill) |

Browsing and keyword search need no account. Anonymous visitors get five agent searches and ten chat messages; a free account lifts the caps and unlocks lists, sharing, and API keys.

## Two kinds of command

| Direct <Badge color="green">free</Badge>                                                                                     | Chat-backed <Badge color="orange">usage-tracked</Badge>                         |
| ---------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------- |
| Answer from the indexes in about a second: `search`, `semantic-search`, `paper`, `related`, `excerpts`, `cite`, `pdf`, lists | Create a model turn, 30–120 s, rate-limited: `ask`, `exec`, `ask-batch`, `wait` |

The Python SDK (`rapidreview-sdk`) isn't covered here yet.

<Columns cols={3}>
  <Card title="Install" icon="download" href="/docs/nisa/start/install">One command, then sign in.</Card>
  <Card title="First search" icon="magnifying-glass" href="/docs/nisa/start/first-search">Search, open, related, cite.</Card>
  <Card title="Web app" icon="map" href="/docs/nisa/guides/web-app">The map, lists, settings, shortcuts.</Card>
</Columns>