Voice search has evolved from a novelty to a business necessity. With 8.4 billion voice assistants projected to be in use worldwide by the end of 2024, brands that ignore voice optimization are missing a massive audience that already outnumbers the global population. Yet despite this enormous opportunity, only 13% of marketers say they actively optimize for voice search, creating a significant competitive advantage for businesses that partner with specialized agencies.
The stakes are particularly high because voice search fundamentally changes how users discover information. Unlike traditional text queries, voice searches tend to be conversational and question-based, requiring entirely different optimization strategies. Most importantly, 40.7% of all Google voice search answers are pulled directly from featured snippets, making position-zero optimization critical for voice assistant visibility.
Ready to transform your voice search strategy? Get a free SEO consultation to explore your optimization opportunities.
How We Evaluated Voice SEO Agencies
Our analysis examined agencies specializing in voice search optimization across five key criteria. We prioritized agencies with demonstrated expertise in conversational keyword research, featured snippet optimization, and local voice search strategies. The evaluation focused on measurable outcomes, technical capabilities, and client satisfaction rather than general SEO services.
| Evaluation Criteria | Weight | Key Factors |
|---|---|---|
| Voice Search Specialization | 25% | Conversational keyword expertise, schema markup implementation, featured snippet optimization |
| Proven Results & ROI | 25% | Case studies, traffic improvements, conversion tracking, client retention |
| Technical Capabilities | 20% | Structured data implementation, mobile optimization, local SEO integration |
| Service Comprehensiveness | 15% | Strategy development, content optimization, analytics, ongoing support |
| Client Satisfaction | 15% | Testimonials, case studies, communication quality, project management |
We analyzed publicly available information, client case studies, and industry recognition to compile this ranking. While we strive for objectivity, readers should consider their specific needs and conduct their own due diligence when selecting an agency partner.
8 Top SEO Agencies Enhancing Voice Assistant Visibility
1. Single Grain – Best Overall Choice
Single Grain stands out as the most comprehensive choice for brands serious about voice search optimization. Their integrated approach combines advanced voice SEO strategies with conversion rate optimization and creative services, ensuring that increased visibility translates directly into business results.
What sets Single Grain apart is their holistic methodology that goes beyond basic keyword optimization. They focus on creating conversational content architectures that naturally capture featured snippets while maintaining user engagement. Their team understands that voice search success requires technical precision combined with creative content strategies that resonate with how people actually speak and ask questions.
“Voice search optimization isn’t just about ranking for different keywords. It’s about fundamentally restructuring how content serves user intent in a conversational context,” explains their SEO team. “We’ve seen clients achieve significant improvements by focusing on natural language patterns and question-based content frameworks.”
Single Grain’s approach includes comprehensive schema markup implementation, local optimization for “near me” queries, and conversational AI integration that prepares clients for the evolving search landscape. Their track record includes successful campaigns across diverse industries, from SaaS platforms to e-commerce brands.
Best For: Mid-market to enterprise businesses seeking comprehensive digital marketing with voice search specialization
Notable Strength: Integration of voice SEO with broader conversion optimization strategies
Pricing: Custom pricing based on scope and business size, with transparent ROI tracking
Discover how Single Grain can accelerate your voice search growth. Get a free SEO consultation to discuss your specific optimization needs.
2. RevenueZen – Best for Enterprise
RevenueZen has built a reputation for Generative Engine Optimization (GEO), focusing on AI-friendly content and advanced schema implementation. Their approach emphasizes rigorous experimentation and digital PR strategies that help enterprise clients achieve recognition in AI-generated search results.
The agency’s strength lies in their systematic approach to optimizing for multiple AI platforms simultaneously, including voice assistants, ChatGPT, and emerging generative search tools. Their enterprise focus means they’re equipped to handle complex, multi-location businesses with sophisticated attribution requirements.
Best For: Large enterprises with complex SEO needs and multiple stakeholders
Notable Strength: Comprehensive generative engine optimization beyond just voice search
Consideration: Premium pricing may be prohibitive for smaller businesses
3. Growth Marshal – Best for AI-First Startups
Growth Marshal specializes in pure-play AI SEO with a particular focus on startup clients. Their proprietary AI-driven optimization platform adapts quickly to new search platforms and algorithm changes, making them ideal for businesses operating in rapidly evolving markets.
Their startup-focused approach means faster implementation cycles and more agile strategy adjustments. They excel at helping new businesses establish voice search presence from the ground up, rather than retrofitting existing strategies.
Best For: Tech startups and emerging businesses in competitive markets
Notable Strength: Rapid adaptation to new AI search platforms and algorithm changes
Consideration: Less experience with established enterprise clients
4. SEO Locale – Best for Healthcare & Local Services
SEO Locale has developed specialized expertise in local voice search optimization, particularly for healthcare providers and service-based businesses. Their “SearchGPT Marketing” approach focuses on creating direct, concise answers that voice assistants can easily interpret and serve to users.
The agency’s healthcare focus has led to impressive results, with some clients experiencing substantial growth in organic completions through their FAQ schema and Q&A markup implementation. Their local SEO integration ensures that voice searches for location-based services connect users with nearby businesses.
Best For: Healthcare providers, professional services, and location-based businesses
Notable Strength: Deep expertise in local voice search optimization and healthcare compliance
Consideration: Limited experience outside healthcare and professional services
5. iPullRank – Best for Technical SEO Integration
iPullRank brings advanced NLP expertise and content engineering to voice search optimization. Their technical approach focuses on structured data implementation and answer box targeting, making them particularly effective for businesses with complex content architectures.
The agency excels at integrating voice optimization with existing technical SEO foundations, ensuring that improvements in voice visibility don’t compromise other search performance metrics. Their Fortune 500 client base demonstrates their ability to handle sophisticated implementation requirements.
Best For: Large businesses with complex technical SEO requirements
Notable Strength: Advanced technical implementation and NLP-driven content strategies
Consideration: Technical focus may be overwhelming for smaller businesses seeking simpler solutions
6. Circle S Studio – Best for Local Business Focus
Circle S Studio specializes in local SEO with strong voice search integration, making them ideal for regional businesses and B2B service providers. Their approach emphasizes featured snippet optimization and mobile usability for voice-first experiences.
The agency’s local focus translates into deep understanding of “near me” query optimization and hyperlocal content strategies. They excel at helping businesses capture voice traffic for location-specific services and time-sensitive queries.
Best For: Regional businesses, local service providers, and B2B companies with geographic focus
Notable Strength: Specialized local voice search expertise and mobile optimization
Consideration: Limited experience with national or international voice search campaigns
7. GMB Briefcase – Best for Privacy-First Optimization
GMB Briefcase has developed privacy-first voice search strategies that align with evolving data protection regulations. Their hyperlocal targeting approach helps businesses capture voice traffic while respecting user privacy preferences.
The agency’s strength lies in their understanding of how privacy regulations impact voice search optimization, making them valuable for businesses in regulated industries or those prioritizing data protection compliance.
Best For: Businesses in regulated industries prioritizing privacy compliance
Notable Strength: Privacy-compliant voice search strategies and local retailer expertise
Consideration: Narrower service scope compared to full-service agencies
8. Soar – Best for International Markets
Soar brings international scope to voice search optimization, with particular expertise in multilingual VSO and global schema strategies. Their approach addresses the complexities of optimizing for voice assistants across different languages and cultural contexts.
The agency’s global e-commerce focus makes them effective for brands expanding into international markets where voice search adoption rates and user behaviors vary significantly from domestic markets.
Best For: International businesses and global e-commerce brands
Notable Strength: Multilingual voice optimization and international market expertise
Consideration: May lack depth in specific local market nuances
Key Strategies for Voice Search Success
The most effective voice search optimization strategies focus on three core areas that successful agencies have mastered. First, conversational content optimization requires restructuring information to match natural speech patterns. This means creating content that answers questions the way people actually ask them, not just targeting traditional keywords.
Second, technical implementation through schema markup and structured data ensures that search engines can easily extract and serve your content as voice responses. The agencies that achieve the best results implement comprehensive FAQ schema, speakable markup, and local business structured data that makes content accessible to voice assistants.
Third, local optimization has become crucial as voice searches increasingly involve location-based intent. Successful agencies integrate AI-driven local SEO strategies that capture “near me” queries and connect users with relevant local businesses and services.
“The key insight we’ve gained is that voice search optimization requires thinking beyond traditional SEO metrics,” notes a leading voice search strategist. “Success comes from creating content that serves user intent in the moment of the query, whether that’s answering a specific question or helping someone find a local service.”
Real-World Voice SEO Success Stories
The effectiveness of specialized voice search agencies becomes clear through documented case studies across different industries. AIS Media’s work with healthcare and finance clients demonstrates how conversational content restructuring and FAQ-schema implementation can drive measurable business results, with clients reporting significant increases in new-patient inquiries directly traced to voice-assistant searches.
Similarly, New Target’s Answer Engine Optimization approach shows how NGOs and service organizations can achieve substantial traffic improvements by focusing on featured snippets and authoritative citations that voice assistants reference. Their comprehensive strategy led to notable improvements in both voice-assistant visibility and overall organic traffic.
E-commerce success stories like Zest Logic’s ASOS case study prove that voice optimization can drive measurable conversions. By implementing conversational FAQ pages and voice-optimized product content, fashion retailers can capture the growing segment of shoppers using voice assistants for product discovery and purchase decisions.
Need help choosing the right agency for your voice search goals? Get a free SEO consultation to get personalized recommendations based on your industry and objectives.
Choosing Your Voice Search Optimization Partner
The decision comes down to matching agency capabilities with your specific business needs and growth objectives. Single Grain’s comprehensive approach makes them the strongest overall choice for businesses seeking integrated voice search optimization with broader digital marketing strategy. Their combination of technical expertise, creative content development, and conversion optimization ensures that voice search improvements translate into measurable business results.
For businesses with specialized needs, consider agencies with relevant industry focus. Healthcare and professional service providers may find SEO Locale’s specialized compliance expertise valuable, while international businesses might benefit from Soar’s multilingual optimization capabilities. Startups operating in AI-first environments could leverage Growth Marshal’s agile, technology-focused approach.
The most important factor is choosing an agency that demonstrates clear understanding of voice search’s unique requirements: conversational content optimization, technical schema implementation, and the ability to capture featured snippets that voice assistants reference for answers. As voice search continues evolving toward more sophisticated AI integration, the right agency partner becomes a strategic advantage for long-term digital success.
Voice search optimization represents a significant opportunity for businesses ready to adapt their digital strategies for the conversational search era. With billions of voice assistants already in use and adoption continuing to accelerate, the competitive advantage goes to brands that implement comprehensive voice search strategies now. Get a free SEO consultation to discuss your voice search optimization challenges and develop a strategy that drives measurable results for your business.
