Sill vs Ahrefs Brand Radar 2026
Head-to-head comparison of two AI visibility platforms. Ahrefs Brand Radar (AI visibility add-on to Ahrefs SEO platform) versus Sill (AI visibility simulator with counterfactual analysis and daily SOV tracking across 6 platforms). Here is what each platform does, where each is stronger, and which one fits your team.
Company overview
| Sill | Ahrefs Brand Radar | |
|---|---|---|
| Focus | Purpose-built AI visibility simulator with counterfactual analysis, daily SOV tracking across 6 platforms, GEO recommendations | Brand Radar add-on to Ahrefs SEO platform; 320M+ search-backed prompt database, AI visibility tracking across 6 platforms, unique backlink-to-AI-citation correlation |
| Founded | 2024 | 2011 (Brand Radar launched 2025) |
| HQ | United States | Singapore |
| Funding | Bootstrapped | Bootstrapped ($100M+ ARR estimated) |
| Customers | 139+ brands across 86 industries | Millions of SEO users (full platform); Brand Radar adoption growing |
At a glance
| Sill | Ahrefs Brand Radar | |
|---|---|---|
| Starting price | $0/mo (free tier) | Free basic Brand Radar (with any Ahrefs account) |
| Full AI coverage cost | $90/mo (6 platforms, 120 prompts) | $699/mo bundle (6 platforms) + Ahrefs base ($129+/mo) = $828+/mo |
| Per-platform add-on | None (all 6 included) | $199/mo per AI platform index |
| AI platforms tracked | 6 in all plans | 6 (AI Overviews, AI Mode, ChatGPT, Perplexity, Gemini, Copilot) |
| Prompt database | Monitoring-focused prompts | 320M+ search-backed prompts (largest claimed) |
| GEO recommendations | Yes (748 across 62 brands) | No specific GEO recommendations |
| Backlink-AI correlation | No | Yes (unique feature: connects backlink profile to AI citation probability) |
| Cross-channel monitoring | AI platforms only | AI + YouTube + Reddit + TikTok brand mentions |
| Counterfactual simulation | In development | No |
| Traditional SEO tools | No | Yes (full Ahrefs suite: Site Explorer, Keywords Explorer, Site Audit) |
Feature comparison
| Feature | Sill | Ahrefs Brand Radar |
|---|---|---|
| AI SOV tracking | Daily across 6 platforms | Across 1-6 platforms ($199/mo each) |
| GEO recommendations | Actionable on-site fixes (87% on-site) | No |
| Prompt database size | Category-specific monitoring prompts | 320M+ prompts derived from real search queries |
| Backlink-AI correlation | No | Yes (analyzes how backlink profile influences AI mentions) |
| Cross-channel brand monitoring | AI platforms only | AI + YouTube + Reddit + TikTok |
| Platform divergence analysis | Yes (55% of brands differ 10+ points) | Not a named feature |
| Counterfactual simulation | In development | No |
| Keyword research | No | Yes (Keywords Explorer, billions of keywords) |
| Backlink analysis | No | Yes (Site Explorer, largest backlink index) |
| Content gap analysis | GEO-focused gap analysis | SEO-focused content gap analysis |
Pricing comparison
| Tier | Sill | Ahrefs Brand Radar |
|---|---|---|
| Free access | Free: $0/mo, 5 prompts, 6 platforms | Free Brand Radar basics (with free Ahrefs account) |
| Single platform AI tracking | Included in $90/mo Basic | $199/mo per platform + Ahrefs base ($129+/mo) |
| Full 6-platform coverage | $90/mo Basic (all included) | $699/mo bundle + $129/mo base = $828+/mo |
| Per-prompt cost | ~$0.75/prompt (Basic, 120 prompts) | Per-platform pricing, not per-prompt |
| Annual discount | 20% | Available on Ahrefs base plans |
| Total cost for AI + SEO | $90/mo (AI only, no SEO tools) | $828+/mo (AI + full SEO suite) |
Which platform fits your team
Choose Sill if you:
- +AI visibility is your primary need and you do not require traditional SEO tools
- +Want full 6-platform AI coverage for $90/mo rather than $828+/mo
- +Need actionable GEO recommendations, not just visibility tracking
- +Want a free tier with real multi-platform data before committing budget
- +Are building toward experimentation and content attribution for AI specifically
- +Do not need backlink analysis, keyword research, or cross-channel (YouTube/Reddit) monitoring
Choose Ahrefs Brand Radar if you:
- +Already use Ahrefs for SEO and want AI visibility in the same ecosystem
- +Need the 320M+ prompt database for AI search demand research
- +Want to understand how your backlink profile correlates with AI citation probability
- +Need cross-channel brand monitoring (AI + YouTube + Reddit + TikTok)
- +Have the budget for full Ahrefs + Brand Radar ($828+/mo) and want a unified platform
- +Value the largest claimed prompt database for competitive intelligence
Verdict
Ahrefs Brand Radar and Sill serve different buying decisions at very different price points. Ahrefs offers the largest claimed prompt database (320M+) and a unique backlink-to-AI-citation correlation that no other platform provides. For SEO teams already in the Ahrefs ecosystem with budget for full coverage, Brand Radar adds AI visibility to a workflow they already use. The cost difference is substantial: Sill provides 6-platform AI monitoring with GEO recommendations at $90/mo; equivalent Ahrefs coverage costs $828+/mo. Sill's GEO recommendations and counterfactual simulation approach provide AI-specific diagnostic depth that Brand Radar does not offer. For teams where AI visibility is the primary investment, Sill provides more AI-specific value per dollar. For teams that need a unified SEO + AI platform and can justify the budget, Ahrefs provides broader coverage across both traditional and AI search.
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