// browser-native_seo_toolkit

Eight on-page SEO tools, in your browser tab.

Page audit, schema validator, meta inspector, AI bot checker, LLM-visibility tester. Plus three smaller tools. Every flagged issue ships with a one-line fix you can copy-paste, not just a red dot. No desktop install. No $129/mo bill for a tool you open twice a week.

Get SerpControl UltraTry Free version// runs locally · no account required for free tier
// what_is_it

A Chrome extension that does what a $1,500/year SEO tool does.

It's the on-page checks you actually open every day, packaged into eight tools. Validate schema. Inspect meta and canonicals. See the heading outline. Map the links. Count the words. Run a 9-section page audit. Check which AI bots your robots.txt is blocking. See what an LLM bot sees when JavaScript doesn't run. And every issue comes with a fix, not just a flag. Everything runs locally. Your data never leaves the tab.

// problems_it_fixes

The four annoyances of modern SEO work.

If you've ever thought any of these, SerpControl was built for you.

// problem_01

Paying $1,500/year for tools you open weekly.

Ahrefs, Moz and SEMrush are priced for enterprises. Most freelancers and small teams use 10% of the features.

// problem_02

Bouncing between five extensions for one audit.

One for meta tags, one for schema, one for headings, one for word count. Five tabs, five paywalls, no consistency.

// problem_03

Auditing on-page SEO by clicking through DevTools.

Inspect the meta, view-source for the canonical, ctrl+F for "ld+json", count H1s by hand. There's a better way.

// problem_04

You don't know what AI sees.

Schema markup, robots.txt, AI bot rules - most tools never tell you whether ChatGPT and Claude can read your site.

// the_math

Cost vs. what you actually get.

The same on-page checks, side-by-side. Competitors show their cheapest annual plan. SerpControl shows the one-time early adopter price.

ToolCostOn-page auditSchema validatorAI botsLLM visibilityFix recommendations
Ahrefs (Lite)€1,450●partial--generic tips
Moz Pro€1,200●partial--generic tips
SEO browser extensions (avg.)€100–300partialpartial--flags only
SerpControl Free€0-●--● per-issue
SerpControl Ultra$10.00 once●●●●● per-issue

// estimates based on publicly listed pricing as of 2026. SEO browser extensions = combined cost of typical paid extensions covering meta/schema/headings individually.

// the_difference

Most extensions tell you what's broken. SerpControl tells you how to fix it.

Every flagged issue, in every tool, comes with a one-line action. Not "schema warning, see docs". The actual fix, right next to the problem. No googling. No schema.org tab. No "now what?" moment.

SeverityPropertyWhat's wrongWhat to do
CRITICAL
offers.price
Price is a number, must be a string
»
Change to "29.99"
WARNING
og:image
Relative URL: /og.jpg
»
Use absolute URL (https://...)
WARNING
Title tag
Too long at 78 chars, will truncate
»
Shorten to under 60 characters
WARNING
Bytespider
Unprotected, bot can scrape freely
»
Add "Disallow: /" under User-agent: Bytespider
CRITICAL
root #__next
Empty SPA root, LLMs see nothing
»
Switch to SSR/SSG (Next.js, Astro, Remix)
CRITICAL
FAQPage.mainEntity[2]
Question missing acceptedAnswer
»
Add acceptedAnswer: {"@type": "Answer", "text": "..."}

// every row above is a real recommendation pulled from the extension's actual fix table. Page Audit, Schema Checker, Meta Inspector, AI Bot Shield, LLM Visibility - every issue in every tool ships with one of these.

// the_free_tier

Free version: the five tools every audit starts with.

Single-page, instant. Click the extension on any URL and the panel renders in under a second. No login, no quota, no usage cap. Schema Checker and Meta Inspector flag every issue alongside the exact fix - other free extensions stop at the warning. Mockups below are the actual UI.

// meta_inspector

Meta Inspector

Title, description, canonical, hreflang, OG, Twitter, robots.txt path check. Warnings come with the fix.
INDEXFOLLOWCANONICAL: SELFROBOTS.TXT: ALLOWED
titleSerpControl - browser-native SEO52 chars
descriptionEight on-page SEO tools, in your tab148 chars
canonicalhttps://app.serpctrl.com/✓ self
og:image/og.jpg⚠ relative
hreflangen, lv, ru3 alts
// schema_checker

Schema Checker

JSON-LD parsed and validated. Every issue paired with the exact fix - not a docs link.
ArticleCLEAN
Product2 WARN
WARNoffers.pricePrice is a number» Use a string e.g. "29.99"
WARNoffers.availabilityShould use full schema.org URL» "https://schema.org/InStock"
FAQPage1 CRIT
CRITmainEntity[2]Question missing acceptedAnswer» Add {"@type":"Answer","text":"..."}
// headings

Headings

Side panel with the full H1-H6 outline. Click a heading and the page scrolls to it with a 2-second highlight.
H1SerpControl - browser-native SEO
H2What it is
H2Free version
H3Five single-page tools
H4Meta Inspector
H4Schema Checker
H2Ultra version
H2Pricing
// link_map

Link Map

Every link, deduped with count. Internal vs. external tabs. One click to HEAD-check every internal link.
INTERNAL (47)EXTERNAL (12)
200×3/pricing↗
200×1/features↗
ERR×1/blog/old-changelog↗
200×6/docs↗
200×2/changelog↗
// word_cloud

Word Cloud

Top 100 words. Sized by share of total. Hover for the exact count and percentage.
auditschemapagelinksmetacanonicalheadingsbrowserextensiontoolsignalstab
// the_pitch

Free, local, no account

Five real tools above. €0. No card. No quota. Your data never leaves the tab.
Account requiredno
Usage capnone
Data leaves browsernever
Crawl history sent to usnone, single-page only
Price, forever€0
// the_ultra_tier

Ultra version: eight tools, one extension.

Everything in Free, plus three audit-grade tools you won't find anywhere else for $10.00, once. A 9-section page audit. A 15-bot robots.txt check. An LLM-visibility tester. Each one ships every issue with a one-line fix you can copy-paste. Mockups below show the actual UI.

// page_audit Ultra

Page Audit

9-section on-page score, 0-100. Every issue tells you exactly how to fix it.
One click. Nine sections (Meta, Social, Headings, Content, Images, Links, Schema, Technical, Robots.txt) each scanned for critical, warning and info issues. The score is severity-weighted. Every issue comes with a one-line fix you can hand straight to your dev or paste into the page, so you know what to ship first instead of staring at a colour-coded dashboard.
78
/ 100
NEEDS WORK
2 crit · 5 warn
Meta Tags2 warn
SocialPASS
HeadingsPASS
Images2 crit · 1 warn
Schema1 warn
IMAGES · FINDINGS & FIXES
CRIT
3 images missing alt text» Add descriptive alt text to all content images
WARN
2 images over 125 chars in alt» Keep alt text concise, under 125 chars
// ai_bot_shield Ultra

AI Bot Shield

15 AI & SEO crawlers checked against your robots.txt, with a paste-ready fix.
Fetches your robots.txt and tells you which of GPTBot, ClaudeBot, Meta-ExternalAgent, Amazonbot, Bytespider, Applebot, AhrefsBot, MJ12bot, PetalBot, Yandex and 5 more are blocked, rate-limited or wide open. Every unprotected bot gets a one-line fix next to it, and one click copies a complete recommended snippet you can paste straight into your robots.txt.
PARTIAL · 67%10 BLOCKED2 RATE-LIMITED3 UNPROTECTED
AI / LLM TRAINING BOTS
BLOCKEDClaudeBotAnthropic
RATE-LIMITED ×3sGPTBotOpenAI
UNPROTECTEDBytespider» Add Disallow: /
BLOCKEDMeta-ExternalAgentMeta AI
SEO & WEB CRAWLERS
RATE-LIMITED ×1sAhrefsBotAhrefs
UNPROTECTEDDotBot» Add Disallow: /
COPY RECOMMENDED SNIPPET
// llm_visibility Ultra

LLM Visibility

What bots see when JavaScript doesn't run, with a fix for every gap.
Re-fetches the page as a non-JS bot, compares raw HTML to the rendered DOM, and flags content that only appears after JavaScript runs. Detects framework/CMS, paywalls and empty SPA roots. Then it gives you an Action Plan: every issue, ordered by severity, paired with the exact fix (switch to SSR, render headings server-side, add JSON-LD, drop the noindex, etc.).
42
PARTIALLY VISIBLE
LLM visibility score
RAW (LLM SEES)
312
words in raw HTML
RENDERED (USER SEES)
1,847
words after JS
LLM coverage17%
1,535 words appear only after JavaScript runs. LLMs miss them.
// product_demo

See SerpControl Ultra in the browser.

// also_in_ultra

Plus the five Free tools, all unlocked.

Meta Inspector, Schema Checker, Headings, Link Map, Word Cloud. Same panels, same UX, same single-page speed. See the mockups in the Free section above. The Ultra license just unlocks the three big ones alongside them.

// who_built_it

Built by people who do this for a living.

Three operators based out of Rīga, Latvia. No VC money, no growth-hacking team. We built the tool because we needed it on a Tuesday afternoon, and the €1 500/year alternatives weren't going to ship it by Friday.

Pauls Špakovskis, SerpCtrl
// pauls_spakovskis

Pauls Špakovskis

Head of SEO at SerpCtrl

Started in marketing, then pivoted to SEO the moment he realised it was the one corner of the job that combined math, logic and marketing into the same problem. Cut his teeth at TV3 and SEOBROTHERS, has shipped work for BBC, TET and LMT. Now Head of SEO and the lead on every tool you see on this page. Wrote most of the on-page logic because the alternative was four browser tabs and a spreadsheet.

LinkedIn
Artūrs Vīgants, SerpCtrl
// arturs_vigants

Artūrs Vīgants

Automation Engineer at SerpCtrl

Works at the end of SEO where Screaming Frog quietly gives up around the 5M-URL mark and you have to write your own. Custom Puppeteer and Crawlee crawlers feeding 100M+ indexable URLs across 20 sites and 18 languages, Python pipelines into BigQuery, server-side analytics on RabbitMQ, NestJS and Strapi. The reason this tool retries cleanly instead of falling over when GSC times out, that part is his.

LinkedIn
// pricing

Two plans. No surprises.

Pay once, own it for life. No subscription, no annual lock-in.

// early_adopter_offer Open until July 1, 2026 for the first wave of early adopters. After that, SerpControl switches to a subscription model.

// tier_01

Free

The five tools you reach for on every page audit.

€0/forever
no card · no account
// pitchFive real tools, unlimited pages, every issue flagged with the fix beside it. Better than every "free trial" on the market.
  • Meta Inspector + robots.txt path check
  • Schema Checker (JSON-LD, 12+ types)
  • Headings outline (click to jump)
  • Link Map + broken-link check
  • Word Cloud (top 100, % share)
  • No on-page audit score
  • No AI bot or LLM tools
Install Free
// tier_02

Freelance

Every Ultra tool unlocked. Built for solo SEOs and consultants.

$10.00/one-time
lifetime access · single seat
// pitchSave €1,000+/year vs. Ahrefs or Moz. Every issue, in every tool, ships with a copy-paste fix.
  • Everything in Free
  • Page Audit (9-section score, 0–100)
  • AI Bot Shield (15 bots checked)
  • LLM Visibility + ordered Action Plan
  • Per-issue fix recommendations across all tools
  • Recommended robots.txt snippet (copy-paste)
  • Single user license
Get Lifetime Access