Google Says You Don't Need llms.txt. Here's the Catch.
Google says llms.txt is unnecessary. Chrome Lighthouse audits it anyway. We fact-checked five studies on what llms.txt really does for AI visibility in 2026.
Jun 12, 2026•19 min read
Tool comparison
Radar vs Ahrefs Brand Radar
Same use case. Live LLM queries instead of monthly snapshots. Hallucination detection, sentiment scoring, and technical AI readiness audits Brand Radar does not include. Starting at $5 per audit instead of $828 per month.
Built for agencies and teams running 5+ AI visibility audits per month
Published May 2026 by Lloyd Pilapil, founder at Pixelmojo
Quick answer
Brand Radar is the right pick if you want bundled SEO tooling and years of historical data, and you have the budget for the $828 to $1,148 per month all-in cost. Radar is the right pick if you care about live ChatGPT and Perplexity accuracy, want technical AI readiness audits Brand Radar does not run, and would rather pay $5 per audit or $199 per month for 40 audits.
The deciding factor for most agencies is the ChatGPT accuracy gap. An independent benchmark found Brand Radar reported only 3 ChatGPT mentions when the live model returned 123, a 97.6% underreport rate driven by Brand Radar's static prompt library and monthly refresh cadence.
97.6%
Underreport rate on ChatGPT mentions: Brand Radar returned 3 mentions when the live model had 123, a 41x gap driven by the static prompt library and monthly refresh cadence.
Source: Writesonic 2026 Brand Radar review
Run a free Radar auditBuilt on real audit data
63
domains audited
6
industries covered
45/100
average AI readiness
55%
scored D or F
Radar's scoring model was calibrated against 63 real domains across 6 industries (healthcare, SaaS, e-commerce, services, finance, education). Zero scored an A. The full methodology and per-industry breakdowns are public in the State of AI Visibility 2026 report.
Read the State of AI Visibility 2026 report →Side by side comparison
Dimension
Ahrefs Brand Radar
Radar by Pixelmojo
Data freshness
Static prompt library, monthly refresh
Live LLM queries on every audit
ChatGPT and Perplexity accuracy
Independent test found 97.6% underreport rate
Direct queries to live models, no sampling gap
Technical AI readiness audits
Not included
Six tools: crawl check, robots.txt, llms.txt, schema, AEO page audit, readiness score
Hallucination detection
Not included
Detects factual errors with severity scoring
Sentiment scoring
Not included
Positive, neutral, negative per mention
Source influence mapping
Not included
Identifies which domains shape AI narratives in your category
Reddit astroturf detection
Not included
Two-layer LLM seeding detection (heuristic plus GPT)
Multi-turn AI Advisor
Not included
Conversational consultant grounded in your audit results
Embeddable badge and shareable reports
Not included
SVG badge for READMEs, 30 day shareable URLs
Branded search volume tracking
Yes (real Google data)
Not included
YouTube mention tracking
Yes (citation appearance only)
Yes, 5-dimension scoring (volume, channel diversity, sentiment, reach, recency) plus AI-generated action plan
TikTok mention tracking
Yes
Roadmap
Years of historical AI visibility data
Yes
New product, history accumulating
Eight things Radar does that Brand Radar does not
Brand Radar is built for breadth of monitoring across many channels. Radar is built for depth of audit on the AI surface specifically. The features below exist in Radar today and have no equivalent in Brand Radar.
Live LLM queries
Every audit hits ChatGPT, Claude, Gemini, and Perplexity in real time. Snapshots refreshed monthly miss what changed last week.
Technical AI readiness layer
Six audits no other tool runs: crawl access, robots.txt for AI bots, llms.txt validation, JSON-LD schema, AEO page scoring, unified readiness.
Hallucination detection
Detects when AI assistants state false facts about your brand, with severity scoring so you know which to fix first.
Sentiment scoring per mention
Every brand citation tagged positive, neutral, or negative across all four LLMs. Spot reputation issues before they harden into training data.
Source influence mapping
See which domains AI models actually cite in your category. Tells you where to win backlinks for AI visibility specifically.
Reddit astroturf detection
Two layer LLM seeding detection (heuristic plus GPT). Catches AI generated promotional content before it shapes your brand narrative.
Multi turn AI Advisor
A conversational consultant grounded in your audit results and our published methodology. Ask follow up questions, not just read a dashboard.
Embeddable badge and shareable reports
SVG badge auto updates on re-audit, drop into READMEs, trust pages, sales decks. 30 day shareable URLs for clients without an account.
Pricing comparison
Ahrefs Brand Radar
Add on to base Ahrefs plan
$828 to $1,148
per month, all in
- ·Ahrefs base plan: $129+/mo
- ·Single AI index: $199/mo
- ·Six platform bundle: $699/mo
- ·No white label reporting
- ·Per domain pricing scales poorly
Radar Audit Packs
Pay as you go
$5 to $40
per pack, credits never expire
- ·Single audit: $5
- ·Three audit pack: $12
- ·Power Pack (10 audits): $40 ($4 per audit)
- ·All 13 tools per audit
- ·Free first audit per domain
Radar Pro Retainer
Best for agencies
$199
per month
- ·40 full audits per month
- ·Watched domain weekly pulse re-scan
- ·Score delta alerts when AI visibility changes
- ·PDF export for client deliverables
- ·LLM Answer Diff (before/after tracking)
At 10 client domains, agencies running Brand Radar pay $8,000+ per month. The same coverage on Radar Pro Retainer is $199 per month.
30 minute migration
You do not have to commit before you compare. Run a side by side audit on three of your real client domains, then decide.
1
Pick three client domains
Choose your most active or most contentious accounts, the ones where Brand Radar has been giving you data you suspect is incomplete.
2
Run them through Radar (free first audit per domain)
No sign up, no credit card. Each audit runs all 13 tools in parallel and completes in about 60 seconds.
3
Compare the citation counts side by side
Match Radar mentions against your latest Brand Radar export. In the published Writesonic benchmark, Brand Radar reported 3 ChatGPT mentions when the live model returned 123, a 41x gap. Your numbers will vary, but the direction is consistent.
4
Move your top 10 client domains
Buy a Power Pack ($40 for 10 audits) or start the Pro Retainer ($199/mo for 40 audits plus weekly pulse). At 10 client domains you save $7,800+ per month versus Brand Radar.
Frequently asked questions
Why is Radar so much cheaper than Ahrefs Brand Radar at $5 per audit?+
We do not bundle Radar with a $129/mo SEO platform you may already have. We charge per audit, with credits that never expire. Agencies running Brand Radar across 10 client domains pay $8,000+ per month. The same coverage on Radar Pro Retainer is $199/mo.
Brand Radar has 250M+ search backed prompts. How do you compete on data volume?+
We do not. Live querying is a different model than prompt library scale. An independent benchmark found Brand Radar reported 3 ChatGPT mentions when the live model had 123 (97.6% underreport). One live query of the actual model beats a million stale snapshots when AI outputs change hourly. See our published methodology at /platform/methodology for the full reasoning.
What do I lose by switching off Brand Radar?+
Three things: branded search volume tracking (Google-only data), TikTok mention tracking, and years of historical Brand Radar data. We are honest about these gaps. For most agency use cases (proving AI search visibility to clients, tracking ChatGPT mentions, fixing technical AI readiness), the trade is worth it.
Do you offer white-label reporting for agencies?+
Pro Retainer includes PDF export with your client domain in the header. Full white label (your logo, your colors, your copy on the cover) is on the roadmap. Talk to us if it is a deal breaker.
How do I trust your accuracy claim?+
Run the same brand through Brand Radar and Radar on the same day, then count the citations yourself. We are also publishing a public benchmark (10 brands, both tools, raw CSV) in the next several weeks. Our methodology page at /platform/methodology lays out the reasoning behind live querying versus snapshot databases.
Can I see Radar in action before I commit?+
Yes. Every domain gets one free audit, no sign up required. Pick a brand you know well and see how the score reads against what you already know.
Run your top three client domains through Radar today
Free first audit per domain. No sign up. Compare the citation count to what Brand Radar gave you and decide from there.
