Prerender.io vs SEO4Ajax (2026): which should you pick?

Pick Prerender.io if

• Fits if your site is a JavaScript app and search or AI crawlers see empty pages
• Works for fixing blank link previews on Facebook, WhatsApp and similar apps

Look elsewhere if

• Watch out: when the trial ends, rendering stops and crawlers get errors until you pay or remove it
• Pricey if you go over your renders, at $2.25 per 1,000 on Starter, with desktop, mobile, redirect and error pages all counted
• Not for you if you can't touch your server or CDN, as setup means adding middleware or a rule
• Tight if you want annual billing, which comes only with the custom-priced Enterprise Plus

Pick SEO4Ajax if

• Fits if you run a small JavaScript site under 1,000 pages and can edit its server config
• Works for sites that need search bots and social previews to see rendered pages

Look elsewhere if

• Watch out: a yearly commitment is still charged monthly, and leaving early costs the lesser of three months of fees or half of what remains
• Pricey if you want the SEO reports, which need Premium at $10 to $66 a month more on a yearly commitment
• Tight if you go over your pages, at $1.50 per 1,000 extra on Project
• Not for you if you run more than 3 sites on Project, as plans cap sites at 3, 5 or 10
• Watch out: the 99.9% uptime SLA is an extra $39 or $79 a month on Growth and Business

Prerender.io

• The free plan ended in October 2025; when the 30-day trial runs out, rendering stops and crawlers get errors until you pay or remove the integration.
• Renders past the allowance cost $2.25 per 1,000 on Starter. Desktop and mobile render separately, and redirect and error pages count too.
• Self-serve plans bill monthly; annual billing comes with the custom-priced Enterprise Plus plan.
• Setup means adding middleware or a CDN rule to your server, framework or hosting.

SEO4Ajax

• A yearly commitment is still charged monthly, and cancelling it early costs the lesser of three months of fees or half of what remains.
• Pages beyond the allowance cost $1.50 per 1,000 on Project, $1.00 on Growth and $0.50 on Business.
• SEO reports need the Premium version of each plan, which costs $10 to $66 a month more on a yearly commitment.
• Plans cap the number of websites at 3, 5 or 10, and a 99.9% uptime SLA is an extra $39 or $79 a month on Growth and Business.

Prerender.io

Rendering for crawlers

Requests from bots are sent to Prerender.io, which returns a cached, fully rendered HTML copy of the page instead of an empty JavaScript shell.

AI Insights

Shows which AI crawlers, such as GPTBot and ClaudeBot, reach the site, which pages they see and what blocks them. Included on every self-serve plan.

Cache controls

Set how often pages are re-rendered, from every 24 hours to 7 days on Starter down to every 6 hours on Pro, with sitemap revisits for new URLs.

Social link previews

Rendered pages give sharing bots the titles and images they need, so link previews load on Facebook, Pinterest, WhatsApp and similar apps.

Many integration options

Setup guides cover Cloudflare Workers, Nginx, Apache, Amazon CloudFront, Fastly, Next.js, Netlify, WordPress, Magento and app builders such as Lovable.

SEO4Ajax

Dynamic rendering for bots

Pages are captured with a current version of Chrome and the cached snapshots are served to search engines such as Google and Bing and to social networks.

Server snippets and middleware

The console gives configuration snippets for Apache, Nginx and IIS, and there are middlewares for Express, Django, Rails and Java plus guides for Cloudflare and CloudFront.

Dedicated capture browsers

Each plan has dedicated browsers that capture pages in parallel; one browser averages about 200,000 captures a month, enough to refresh a Project site every 3 days.

Console metrics

Shows bot activity, cache freshness, duplicate pages and broken links for each site, with metadata exports to CSV.

Capture hooks and rewrite rules

Control how pages are captured and return HTTP errors or redirects to bots, page by page or by URL pattern.

SEO reports

Premium plans add reports on technical issues that can hurt indexing, such as broken links, duplicates and invalid hreflang tags.

Prerender.io

• Starter$59

  per month for 30,000 renders, billed monthly

  Unlimited domains, API access, cache refresh every 24 hours to 7 days, 60 days of data and extra renders at $2.25 per 1,000.

• Growth$169

  per month for 100,000 renders, billed monthly

  Cache refresh every 12 hours to 14 days, 6 months of data, an audit log and extra renders at $1.75 per 1,000.

• Pro$419

  per month for 500,000 renders, billed monthly

  Cache refresh every 6 hours to 30 days, per-URL cache rules, 2 years of data, priority support and extra renders at $1.50 per 1,000.

• Enterprise PlusCustom

  1 million or more renders, a dedicated success and account manager, a 2-hour support SLA, business reviews and annual billing.

SEO4Ajax

• Developer$0

  1,000 pages and 2,500 snapshots a month, with community support.

• Project$29

  per month for 20,000 pages, yearly commitment ($39 monthly)

  Up to 3 websites, 1 dedicated browser and email support within 48 hours. The Premium version with SEO reports is $39 ($52 monthly).

• Growth$99

  per month for 100,000 pages, yearly commitment ($129 monthly)

  Up to 5 websites, 5 dedicated browsers and email support within 24 hours. The Premium version with SEO reports is $132 ($172 monthly).

• Business$199

  per month for 500,000 pages, yearly commitment ($249 monthly)

  Up to 10 websites, 10 dedicated browsers and email support within 24 hours. The Premium version with SEO reports is $265 ($332 monthly).

• Custom PlanCustom

  For more than 500,000 pages or 10 sites, or custom support, SLA or browser counts.

Prerender.io

No public discounts listed.

SEO4Ajax

• Annual discount

  Save 20% to 26% with a yearly commitment

  Project is $29 a month on a yearly commitment instead of $39 month to month, Growth $99 instead of $129, and Business $199 instead of $249.