When a marketing committee asks "how is our awareness doing?", two distinct metrics arrive at the table: classic Share of Voice and GEO-native Presence Index. Confusing them leads to bad budget decisions. This guide separates them precisely and explains when each is used.
What Share of Voice measures
Share of Voice (SoV) quantifies the percentage of the "total sector conversation" that belongs to your brand. In classic PR, it's calculated as your brand mentions / total sector mentions in media. In SEO, it's measured as your organic visibility / total organic visibility of the top-N competitors across a defined keyword set (Sistrix, Semrush, Ahrefs provide this). It's an awareness metric: how much you're talked about relative to your competitors.
What Presence Index measures
GEOMOND's Presence Index measures the effective probability that your brand is cited as a response when a user queries a generative AI about your sector. It's calculated from a fixed set of representative prompts per client, executed reproducibly against multiple LLMs (ChatGPT, Claude, Gemini, Perplexity) and SERPs (Google, Bing). AI component: 60%; SERP component: 40%. Output is a 0-100 score with breakdown by model and by prompt.
Key differences
Data nature: SoV is a passive aggregate of spontaneous mentions; Presence Index is the active response a system gives when asked. Measurement point: SoV is measured "before" the journey (advertising, content); Presence Index "during" (when someone asks and decides). Reproducibility: SoV depends on media sampling; Presence Index is 100% reproducible if the prompt set is fixed.
When to use each
Use Share of Voice when evaluating PR or mass-branding campaigns, when comparing yourself to competitors in media coverage, or when working in sectors where purchase decisions still flow mainly through traditional channels. Use Presence Index when your sector has decisions impacted by AI queries (consulting, legal, health, premium B2B), when investing in GEO and needing to measure that specific ROI, or when getting ahead of post-Google fragmentation.
Why leaders measure both
The two metrics correlate partially but not totally. A brand can have high SoV (lots of advertising and press releases) and low Presence Index (AI doesn't cite it as a technical reference) if the published content isn't structured, doesn't answer concrete questions, and doesn't build topical authority. Conversely, a brand can have low SoV and high Presence Index if its content is highly extractable by LLMs even though it circulates in few media. The two diagnostics together allow precise budget allocation.
Practical implementation in 2026
A brand with mid-range budget can measure both at reasonable cost: SoV via Sistrix/Semrush or media-monitoring services (Mention, Brandwatch); Presence Index via GEOMOND or equivalent tools (Profound, Otterly). Combined operational effort: ~4-6 hours/month to maintain the dashboard. ROI: real visibility on where your brand wins and loses, in each channel, each month.
The mistake to avoid is reporting only one. If you only present SoV, you hide the reality of the new AI channel; if you only present Presence Index, you ignore the buyer who still starts on Google or in media. The dual reading is what sustains a serious strategic conversation. Request from GEOMOND your audit with both metrics calculated for your specific sector.
Frequently asked questions
How does Presencia Index differ from classic Share of Voice?
SoV measures share of mention vs. competitors in a channel (media, social, SEO); Presencia Index measures share of mention specifically inside generative-AI answers, weighted by position and context. Complementary but not interchangeable.
Can I keep using SoV if I work GEO?
Yes, as a complementary metric. SoV gives historical context and media coverage; Presencia Index tells you whether an AI recommends you in real answers. Mature brands combine both in their monthly dashboard.
What Presencia Index threshold is good?
0-3 invisible; 3-5 occasional presence; 5-7 competitive reference; 7-10 category leader. Most B2B SMBs in Spain start at 1-2 and a well-executed GEO program brings them to 5-6 in 6-9 months.