# Onto vs context.dev · Where each one fits
> Both scrape any URL into Markdown for agents. context.dev adds crawl, search, brand data and AI answers; Onto adds a free 0–100 score, no model in the pipeline, and an SDK for your own Next.js site.

**Source:** /compare/context-dev
**Extracted:** 2026-09-24T18:14:20.572Z

---
Compared · Onto vs context.dev

## context.dev scrapes the web and knows brands. _Onto reads, and scores what it read._

Both turn a URL into Markdown for agents, map a site, and connect over MCP. context.dev adds crawls of up to 500 pages, search, brand data and AI answers. Onto adds a free 0–100 score, no model anywhere in the pipeline, and an SDK for serving agents from your own site.

[Try the scanner free](/scanner) [All comparisons](/compare)

90

context.dev AIO score

80

buildonto.dev, ours

24 Sep 2026

both scanned

Shared ground

### What context.dev and Onto both do.

Starting anywhere else would be dishonest. For a lot of jobs either one is a reasonable answer.

Markdown

#### Any URL as Markdown

Both scrape a public page into clean Markdown an agent can read, for 1 credit.

Sites

#### Map a site

Both list a site's URLs, so an agent can decide what to read next.

MCP

#### A hosted MCP server

Both connect to Claude Code and other clients over MCP, with sign-in in the browser.

Free tier

#### 1,000 credits a month

Both give 1,000 credits a month free, no card.

Line by line

### Where the two differ.

A dot marks who comes out ahead on the row, when anyone does. A dash means the product doesn't do it. Their side is from context.dev's own site, 24 Sep 2026.

CapabilityOntocontext.dev

Page → MarkdownYes · 1 credit a URL, cached an hour, failures refundedYes · 1 credit a call

Rendered pagesNo · client-rendered pages come back flaggedYes · rendered HTML and screenshots

A 0–100 score for the page0–100, every penalty named · /v1/score is free—

Hallucination-risk labellow, medium or high, per page—

Map a site/v1/map · sitemap, then on-page linksYes

Read many pages/v1/batch · up to 50 URLs, 1 credit eachCrawl, up to 500 pages

Web search—Yes

Brand data—Logos, colours, company details · 10 credits

Answers from a model— · no model insideAnswers · 10 or 100 credits

MCP serverYes · six tools, OAuth or npxYes · hosted

Serve agents from your own site@ontosdk/next, for Next.js 14+—

Free1,000 credits a month1,000 credits a month

Paid$9, $49 or $250 a month, plus credit packsFrom $25 a month

Which to pick

### When to choose context.dev instead.

Both columns are real. If the right-hand one describes you, use them.

#### Pick Onto if…

*   You want to know how readable a page is before your agent grounds on it, for free.
*   You want nothing in the pipeline that could make a fact up.
*   You run a Next.js site and want agents served Markdown from it.

#### Pick context.dev if…

*   You need brand data: logos, colours, company details.
*   You need crawls of hundreds of pages, search, or screenshots.
*   You want a model to research and answer across sources.

Common questions

### Details worth knowing.

01Does Onto have anything like context.dev's brand data?

No. Onto reads pages and scores them; it doesn't keep a database of companies. If logos and company details are the job, context.dev does it and Onto doesn't.

02Does Onto render JavaScript?

No. It reads the HTML the server sends. A page that only fills in after scripts run comes back with a warning in `warnings`, so you know the Markdown may be thin.

03Is the score in every read?

`/v1/read` returns the Markdown with its metadata and stats. `/v1/score` returns the score alone and costs nothing; `/v1/read-and-score` returns both for 1 credit. [How the score works](/scoring).

About context.dev, from its own pages on 24 Sep 2026: [context.dev pricing](https://context.dev/pricing) · [context.dev MCP docs](https://docs.context.dev/install-mcp) . About Onto: [the Read API docs](https://docs.buildonto.dev/api/read) and [pricing](/pricing). Prices on both sides change; check before you decide.

Decide for yourself

### Run the same URL through both.

The scanner is free and needs no account. Compare the actual output rather than the marketing.

[Open the scanner](/scanner) [All comparisons](/compare)

---
## Structured Data (JSON-LD)
```json
{
  "@context": "https://schema.org",
  "@graph": [
    {
      "@type": "Organization",
      "@id": "https://buildonto.dev/#org",
      "name": "Onto",
      "url": "https://buildonto.dev",
      "logo": "https://buildonto.dev/icon.png",
      "sameAs": [
        "https://x.com/buildonto",
        "https://github.com/ravixalgorithm/ontosdk"
      ]
    },
    {
      "@type": "WebSite",
      "@id": "https://buildonto.dev/#site",
      "url": "https://buildonto.dev",
      "name": "Onto",
      "publisher": {
        "@id": "https://buildonto.dev/#org"
      }
    },
    {
      "@type": "SoftwareApplication",
      "name": "Onto",
      "applicationCategory": "DeveloperApplication",
      "operatingSystem": "Web",
      "url": "https://buildonto.dev",
      "description": "Onto serves AI agents clean Markdown from your own site, at the same URL, and shows you which agents came. Plus the AIO score, a Read API and an MCP server.",
      "publisher": {
        "@id": "https://buildonto.dev/#org"
      },
      "offers": {
        "@type": "Offer",
        "price": "0",
        "priceCurrency": "USD",
        "description": "Free tier: 1,000 credits / month"
      }
    }
  ]
}
```