Sill vs Otterly AI 2026
Head-to-head comparison of two AI visibility platforms. Otterly AI (AI search monitoring tool) 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 | Otterly AI | |
|---|---|---|
| Focus | AI visibility simulator with counterfactual analysis, daily SOV tracking across 6 platforms, GEO recommendations | AI search monitoring with GEO audit tool (25+ factors), agency-first design, 6 AI platforms tracked |
| Founded | 2024 | 2023 (launched October 2024) |
| HQ | United States | Santa Clara, USA (Austrian founders) |
| Funding | Bootstrapped | Bootstrapped ($770K revenue as of Oct 2025) |
| Customers | 139+ brands across 86 industries | 20,000+ marketing professionals, notable: Adidas |
At a glance
| Sill | Otterly AI | |
|---|---|---|
| Starting price | $0/mo (free tier) | $29/mo (Lite) |
| Mid-tier price | $90/mo (120 prompts, 6 platforms) | $189/mo (100 prompts, 4 platforms) |
| AI platforms included | 6 in all plans | 4 base; Gemini and AI Mode are paid add-ons |
| Prompts at entry | 5 (free) | 15 (Lite, $29/mo) |
| Free tier | Yes | Free trial only |
| GEO recommendations | Yes (748 across 62 brands) | GEO Audit tool (25+ evaluation factors) |
| Counterfactual simulation | In development | No |
| Agency features | Enterprise tier | 50+ certified agency partners, built-in agency tools |
| G2 rating | Early stage | 4.9/5 (High Performer, AEO category) |
| Case studies | 139 brands, 86 industries benchmark | Adidas (+7% SOV, +2.43 brand position) |
Feature comparison
| Feature | Sill | Otterly AI |
|---|---|---|
| SOV tracking | Daily across 6 platforms | Daily across 4-6 platforms (add-ons required) |
| GEO recommendations | Actionable on-site fixes | GEO Audit: 25+ content and technical factors |
| Counterfactual simulation | In development | No |
| Competitor benchmarking | Yes | Yes |
| Citation tracking | Yes | Yes |
| Content Checker | No | Yes (JavaScript rendering, AI readiness, schema analysis) |
| Keyword/prompt research | Included | Included |
| Platform divergence analysis | Yes (91.6% single-platform citations) | Not a named feature |
| Data export | CSV | CSV + Looker Studio integration |
| Agency partner program | No | Yes, 50+ certified partners |
Pricing comparison
| Tier | Sill | Otterly AI |
|---|---|---|
| Entry | Free: $0/mo, 5 prompts, 6 platforms | Lite: $29/mo, 15 prompts, 4 platforms |
| Mid | Basic: $90/mo, 120 prompts, 6 platforms | Standard: $189/mo, 100 prompts, 4 platforms |
| Upper | Pro: $225/mo, 360 prompts, 6 platforms | Premium: $489/mo, 400 prompts, 4 platforms |
| Full platform coverage | Included at all tiers | Requires paid Gemini + AI Mode add-ons |
| Per-prompt cost (mid) | ~$0.75/prompt | ~$1.89/prompt |
| Annual discount | 20% | Available (amount not confirmed) |
Which platform fits your team
Choose Sill if you:
- +Want all 6 AI platforms included without add-on fees
- +Need actionable GEO recommendations beyond audit-style reports
- +Want a free tier to evaluate with real data before paying
- +Are building toward content attribution and experimentation, not just monitoring
- +Need platform divergence analysis (which platforms see you differently and why)
- +Want lower per-prompt cost for scaled monitoring
Choose Otterly AI if you:
- +Run an agency and need the certified agency partner program and multi-client tools
- +Want a GEO audit tool with 25+ evaluation factors for technical and content readiness
- +Need Looker Studio integration for client reporting
- +Value the most mature product in the pure-play AI visibility space (first mover, G2 4.9/5)
- +Want to start monitoring at $29/mo (lowest entry price in the market)
- +Need a Content Checker that evaluates JavaScript rendering and schema markup for AI readiness
Verdict
Otterly AI is the most established bootstrapped player in AI visibility monitoring with the strongest G2 ratings (4.9/5) and a notable Adidas case study. Its GEO Audit tool with 25+ evaluation factors provides genuine technical assessment capability. Sill and Otterly occupy similar price ranges, but their approaches differ: Otterly provides monitoring and auditing, Sill provides monitoring and diagnostic recommendations. Otterly's agency partner program (50+ certified partners) is a clear advantage for agency buyers. Sill's inclusion of all 6 AI platforms at every tier (Otterly charges add-on fees for Gemini and AI Mode) and its per-prompt cost advantage ($0.75 vs $1.89 at mid-tier) favor brands doing scaled multi-platform monitoring. For agencies, Otterly's ecosystem is ahead. For in-house teams wanting the most coverage per dollar with optimization guidance, Sill is the stronger fit.
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