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Intercrawl and SEO4Ajax

Both serve crawlers a rendered copy of a JavaScript site. How each one builds its copies, what it shows you and what it costs, from each service's own pages.

Last checked 21 October 2026

SEO4Ajax and Intercrawl both answer crawlers with a rendered copy of a site built with JavaScript, while visitors reach the site as before. They build those copies differently. What this page says about SEO4Ajax comes from SEO4Ajax's own pages, listed under Sources with the date each was read.

At a glance

SEO4AjaxIntercrawl
How copies are madeIts crawler visits your site "using the latest version of Google Chrome" and captures pages ahead of time, following links and your sitemapsA page is rendered the first time a crawler asks for it, then kept and renewed
Crawlers it names"Google, Bing, Yandex etc." and "Facebook, Twitter, Flipboard etc."Search, AI and link-preview crawlers, each listed on the crawler list
How a crawler is recognisedBy your server configuration, from the requestBy the user agent, and the IP address against the operator's published ranges where they exist
Refreshing copiesAn expiration period set per site; an expired page is queued for capture when a bot asks for it7 days, and a new render when the page changes (below)
InstallsApache, nginx, IIS and Varnish configurations; middleware for Express, Next.js, Go, Django, Rails and Java; Akamai, Vercel, Cloudflare and CloudFront guidesA file for Next.js, Vercel, Netlify or Cloudflare; connecting Vercel or Cloudflare with no code; DNS mode; or the Prerender-compatible API
ReportsA dashboard of "Bot activity insight, cache freshness, duplicates, broken links"; SEO reports on the Premium plansA daily audit comparing each crawler's view with a visitor's, alerts and monthly reports
PriceFree for 1,000 pages; paid plans from 29 USD a month on a yearly commitmentFree during the 14-day trial, and free after it until paid plans open

Making the copies

SEO4Ajax crawls the site itself. Its getting started guide has you press "Crawl site", which "will order the SEO4Ajax crawler to capture all the pages on the site"; it finds pages from links (<a href>, canonical, previous and next) and from sitemaps you add, and waits 3 seconds by default for a page's JavaScript before it captures. Each plan includes a number of captured pages, shared between your sites, and a number of dedicated browsers; the pricing page says the Project and Growth plans' browsers "should let you refresh your entire sites every 3 days".

Intercrawl renders on demand. The first crawler to ask for a page gets it rendered within 10 seconds (or your own page, if that is not enough), and later crawlers get the stored copy. A copy is kept for 7 days and served while a new one is made after that. A page is also rendered again when its scripts, stylesheets, title, description or canonical change (checked at most once an hour), when your sitemap gives it a newer lastmod, and when you call the re-cache API. Pages no crawler asks for are never rendered.

Recognising crawlers

With SEO4Ajax, the configuration on your server detects bot requests and fetches the stored capture for them; the homepage names search engines and social networks.

Intercrawl decides inside its install file or Worker. Where a crawler's operator publishes the IP addresses it crawls from (Google, Bing, OpenAI, Anthropic, Perplexity and Apple do), each request is checked against them, and a request that names Googlebot from any other address gets your own page. See How serving works.

What each one shows you

SEO4Ajax's dashboard covers bot activity, cache freshness, duplicates and broken links, and its Premium plans add SEO reports that highlight issues such as broken links, duplicates and invalid hreflang tags.

Intercrawl audits up to 100 pages of each site every day as a visitor, as Googlebot, as GPTBot and as ClaudeBot, and compares each crawler's view with the visitor's: status, visible text, links, title and canonical. For any page you can see the crawler's text and HTML next to the visitor's, with the differences marked. Alerts go by email, Slack or webhook. See Audits and alerts.

Price

Prices as listed on SEO4Ajax's pricing page, in US dollars a month:

PlanYearly commitmentMonthly commitmentPagesWebsites
DeveloperFreeFree1,000 (2,500 snapshots a month)Not stated
Project293920,000Up to 3
Growth99129100,000Up to 5
Business199249500,000Up to 10

Premium versions of the Project, Growth and Business plans add SEO reports (39, 132 and 265 a month on a yearly commitment). Pages over the limit cost 1.50, 1.00 or 0.50 per 1,000, by plan.

Intercrawl is free during the 14-day trial and stays free after it until paid plans open, with one site per account until then. Paid plans and their prices in US dollars will be shown before anyone is asked to pay; see the Terms.

Moving from SEO4Ajax

Remove SEO4Ajax's configuration or middleware from your server, then add the Intercrawl install that fits your site: Choose an install. Run an audit afterwards to see what each crawler receives.

A note on rendering for crawlers

Google calls serving crawlers a rendered copy (dynamic rendering) "a workaround and not a recommended solution", and recommends "server-side rendering, static rendering, or hydration" instead. It also says that "Googlebot generally doesn't consider dynamic rendering as cloaking" as long as it "produces similar content". Both services render for crawlers. If your site can render on the server, that is the better fix; Intercrawl's audits are there to show the crawler's copy matches what visitors get.

Intercrawl does not promise any ranking, indexing or citation by an AI answer, and neither does this comparison.

Sources

Read on the dates shown (UTC). Prices and features change; if anything here is out of date, write to hello@intercrawl.com.