When marketers sit down to plan budgets, campaigns, and quarterly targets, two metrics often appear at the centre of the debate: Share of Voice (SOV) and Share of Search (SOS).
Both promise insight into brand presence, yet they measure different behaviours.
Understanding which signal guides planning more effectively depends on your objectives, your industry, and how you measure success.
What is Share of Voice?
Share of Voice traditionally reflects how much advertising exposure your brand achieves compared with competitors. It can be measured through:- Paid media spend (TV, radio, digital display)
- Social mentions and engagement
- PR coverage
What is Share of Search?
Share of Search tracks how often people search for your brand name online compared with competitors. It’s a leading indicator of brand interest and intent, offering a real-time view of demand signals.
Unlike SOV, which relies on spend and media data, SOS uses organic behaviour. This makes it a cost-effective and predictive measure, particularly valuable in digital-first markets.
Why Share of Voice Still Matters
For categories with low online search activity, such as impulse purchases or luxury items, traditional advertising and awareness campaigns remain critical.
SOV ensures your brand is front of mind when purchase opportunities arise. It also plays a role in long-term brand equity, as consistent exposure builds trust and familiarity.
Why Share of Search is Gaining Ground
As consumer journeys move online, SOS provides a faster, more reliable view of brand demand.
Research from Les Binet and James Hankins has shown that shifts in SOS often predict future changes in market share.
For marketers under pressure to show ROI, SOS offers evidence of effectiveness earlier than sales data can.
Planning with Both Signals
Neither metric should be dismissed. Instead, the strongest strategies integrate them:- Use SOV to guide awareness investment: Benchmark your media spend against competitors to ensure your brand remains visible enough to stay competitive.
- Use SOS as a leading indicator: Monitor shifts in search interest to identify early signs of growth or decline, and adjust campaigns accordingly.
- Layer in customer personas: Linking these signals to who your audience is (see my persona guide) ensures your planning isn’t just about volume, but about relevance.
- Track over time: Both SOV and SOS gain value when monitored longitudinally. Look for trends, not one-off spikes.
Aspect
Share of Voice (SOV)
Share of Search (SOS)
Definition
Percentage of brand visibility compared with competitors across media and mentions
Percentage of branded search queries compared with competitors
Data Source
Media spend, ad impressions, PR coverage, social mentions
Google Trends, search engine data, analytics platforms
Focus
Awareness and exposure
Consumer demand and intent
Strengths
Good for benchmarking visibility, long-term brand building and competitive analysis
Low cost, predictive of market share, real-time behavioural signal
Limitations
Expensive to measure, may not reflect intent or demand
Limited in low-search categories, influenced by SEO and seasonality
Best For
FMCG, retail, high-spend categories
Digital-first sectors, B2B, SaaS, ecommerce
Time Horizon
Long-term equity building
Short to medium-term forecasting
Final Thoughts - Which One Guides Better?
If your aim is short-term optimisation and spotting opportunities early, share of search is the sharper tool.
If you’re building long-term equity and competing in brand-heavy markets, share of voice still offers vital context.
The real power comes from using them in tandem, balancing reach with demand, and awareness with intent.
#DigitalStrategy #MarketingPlanning #CustomerEngagement
