Table of contents
How we vet every listicle
Every agency featured on Web Tonic passes our 84-point editorial review before a single listicle goes live. This is how we vet each pick:
Verified client outcomes: We require real case studies with measurable KPIs — revenue, ROAS, CPA, retention — tied to the exact category being ranked. No cherry-picked wins, no unverifiable numbers.
Independent reputation: We cross-check Clutch, Google, G2, and Trustpilot ratings, and screen for review-bombing or suspicious patterns. Only operators with a consistent, verifiable track record make the cut.
Beyond that, every listing goes through a quarterly re-audit. We check 84 criteria across 6 pillars to make sure it still holds up — here are some of the checks we run:
A conversion rate optimization agency works on traffic you already pay for: it instruments the site, reads where visitors abandon, turns each guess into a written hypothesis, then proves or kills it with a controlled A/B or multivariate test before the winning version is built for good.
Our screen was deliberately narrow: twelve external firms serving Los Angeles survived it, judged on testing and analytics work shown on their own sites rather than a CRO line in a services menu. Only a third of the bench is headquartered in Los Angeles; the rest sell testing into the market from Texas, New Jersey and New York.
What does a Los Angeles conversion rate optimization agency actually deliver?
Research, instrumentation, written hypotheses and tested changes to the pages your traffic already lands on. Twelve external firms working in Los Angeles cleared our evidence read; five publish a Los Angeles address, three credit a client you can check, and none prints a rate.
1. Web Tonic
About: Web Tonic runs testing inside the growth program rather than as a side project, so the measurement work, the paid traffic that fills the page and the build that ships a winning variant are briefed together. Briefs from Los Angeles usually arrive with plenty of sessions and no test history, so the first session is spent on what that traffic can actually prove
Key Services: Growth Marketing, Paid Social, PPC, Meta Ads, SEO, Google Ads, Snapchat Ads, Amazon Ads, Reddit Ads, TikTok Ads, TikTok Shop, GEO-AEO, Webflow Design, Shopify Design, WordPress Design, UGC, Social Media Management, Pay Per Click Management, Marketing Analytics, Analytics Implementation & CDPs, Performance Branding, Performance 360° Audit, Programmatic Ads, OOH Ads, HR Marketing
Industries Served: eCommerce, SaaS, B2B, Construction Professionals, Home Services, SMEs, Health Spa & Wellness, Retail, Legal & Judicial Services, Food & Beverages, Pets, Fitness, Family & Children, Finance & Insurance, Travel, Non-Profits & Organizations, Furniture & Decoration
Notable Clients: WorldRemit, Jack & Jones, Ardene, L’Oréal, Sendwave, Nestlé, Airbnb. Serve Fortune 500 companies and smaller fast-paced startups.
Locations: HQ in San Francisco with notable offices in New York, Chicago, Miami, Toronto, Montreal, Dubai, Singapore, Sydney and more. Offices on five continents.
Pricing: Starting at USD $3,000 per month. Flexible and scalable plans at any time according to your enterprise needs. Book a call to learn more.
Great For: Mid-market to enterprise-level businesses requiring ongoing, on-tap growth and performance marketing services.
Website: Web Tonic
2. SmartSites
About: SmartSites is a full-service digital marketing agency that provides conversion rate optimization (CRO), user experience design, and A/B testing services to help businesses maximize website performance. They combine behavior research and data analysis to refine digital funnels and increase online lead conversion without requiring extra traffic.
Key Services: Conversion Rate Optimization (CRO), A/B Testing, User Experience Design, Behavior Research, Web Design & Development, Search Engine Optimization, Pay-Per-Click Advertising
Industries Served: E-commerce, Home Services, B2B, Retail
Notable Clients: No client publicly named on the firm's own site
Locations: Paramus, New Jersey
Pricing: Quote-based
Great For: E-commerce brands, Home Services brands, B2B brands
Website: SmartSites
3. Coalition Technologies
About: Coalition Technologies is a digital marketing agency headquartered in Los Angeles, California. They offer comprehensive conversion rate optimization (CRO) and ecommerce-focused CRO services to enhance website user experience and maximize conversions. Their team utilizes data-driven strategies and analytics to target high-impact areas for business growth.
Key Services: Conversion Rate Optimization, Ecommerce CRO, Web Design & Development, Pay Per Click (PPC), Search Engine Optimization (SEO), Email Marketing
Industries Served: Ecommerce, Lead Generation, B2B
Notable Clients: No client publicly named on the firm's own site
Locations: Los Angeles
Pricing: Quote-based
Great For: Ecommerce brands, Lead Generation brands, B2B brands
Website: Coalition Technologies
4. Amazon Growth Lab
About: Amazon Growth Lab is an e-commerce agency specializing in full-service Amazon marketplace management, PPC advertising, and conversion optimization. They perform structured A/B split testing for content, titles, images, and A+ modules using Amazon's native tools to improve conversion rates and marketplace performance.
Key Services: Amazon PPC Management, A/B Split Testing, Listing Optimization, Amazon DSP Services, Storefront Design
Industries Served: Ecommerce, Consumer Goods, Retail
Notable Clients: Ray-Ban, Reebok, Anker, Eufy, Ernst Grain
Locations: Los Angeles
Pricing: Quote-based
Great For: Ecommerce brands, Consumer Goods brands, Retail brands
Website: Amazon Growth Lab
5. Melleka Marketing
About: Melleka Marketing is a digital marketing and web design agency offering customized monthly partnerships and online growth solutions. Their service offerings include data-backed conversion rate optimization, A/B testing for landing pages, forms, and user flows, as well as heatmaps and user behavior analysis.
Key Services: A/B Testing & CRO, Attribution Modeling, Heatmaps & User Behavior, Paid Advertising, SEO, Website Design
Industries Served: No industry focus stated on their own site
Notable Clients: No client publicly named on the firm's own site
Locations: Los Angeles
Pricing: Quote-based
Great For: Local and regional brands
Website: Melleka Marketing
6. Digital Drew SEM
About: Digital Drew SEM is a digital marketing and advertising agency specializing in data-driven Google Ads management, social media advertising, and search engine optimization. Their performance approach incorporates continuous optimization, conversion rate tracking, and A/B testing for ad elements and landing pages.
Key Services: Google Ads / PPC, A/B Testing, Meta & Social Ads, SEO, AI Search & GEO, Email Marketing, Web Development
Industries Served: No industry focus stated on their own site
Notable Clients: No client publicly named on the firm's own site
Locations: New York, NY
Pricing: Quote-based
Great For: Local and regional brands
Website: Digital Drew SEM
7. Ascendly Marketing
About: Ascendly Marketing is a digital marketing and consulting firm offering an integrated suite of services, including conversion rate optimization, SEO, PPC, and website design. Their approach combines analytics, user experience, and multi-channel marketing to help businesses improve lead generation and drive revenue growth.
Key Services: Search Engine Optimization (SEO), Pay Per Click (PPC) Advertising, Website Design and Development, Conversion Rate Optimization (CRO), Social Media Marketing, Marketing Consulting, Content Marketing, Email Marketing, B2B Lead Generation
Industries Served: No industry focus stated on their own site
Notable Clients: No client publicly named on the firm's own site
Locations: The Woodlands, TX
Pricing: Quote-based
Great For: Local and regional brands
Website: Ascendly Marketing
8. 13 Stripes Marketing
About: 13 Stripes Marketing is a digital marketing agency headquartered in Plano, Texas. Their website states that they offer conversion rate optimization and A/B testing services to help businesses leverage user behavior data and test different combinations for performance.
Key Services: Conversion Rate Optimization (CRO), A/B Testing, Search Engine Optimization (SEO), Web Design and Development, PPC / SEM, Social Media Marketing
Industries Served: No industry focus stated on their own site
Notable Clients: No client publicly named on the firm's own site
Locations: Plano, Texas
Pricing: Quote-based
Great For: Local and regional brands
Website: 13 Stripes Marketing
9. Digicorns Technologies
About: Digicorns Technologies is a digital marketing and web services agency that provides conversion rate evaluation and optimization services alongside search engine optimization and PPC management. According to its official site, its US office is headquartered in San Mateo, California.
Key Services: Digital Marketing, SEO Services, PPC Management, Conversion Rate Optimization, Social Media Marketing, Web Development
Industries Served: No industry focus stated on their own site
Notable Clients: No client publicly named on the firm's own site
Locations: San Mateo, California
Pricing: Quote-based
Great For: Local and regional brands
Website: Digicorns Technologies
10. MarketCrest LLC
About: MarketCrest LLC is an international award-winning marketing agency headquartered in Plano, Texas, that specializes in growing law firms through custom client acquisition systems. Their offerings include paid advertising, content marketing, website design, and conversion optimization to help firms turn website traffic into signed retainers.
Key Services: Conversion Rate Optimization, Website Optimization, Paid Advertising, AI SEO, Content Marketing, Branding, Consulting and Fractional Marketing
Industries Served: Legal, Law Firms
Notable Clients: No client publicly named on the firm's own site
Locations: Plano, Texas
Pricing: Quote-based
Great For: Legal brands, Law Firms brands
Website: MarketCrest LLC
11. The Loomis Agency
About: The Loomis Agency is a full-service advertising and branding agency headquartered in Dallas, Texas, specializing in challenger brand positioning and underdog marketing strategies. They offer comprehensive creative, digital, media, and communications services across traditional and digital platforms.
Key Services: Advertising, Branding, Digital Marketing, Social Media, Media Buying
Industries Served: Restaurant, Retail, Healthcare, Franchise
Notable Clients: Golden Chick, Salad And Go, Texas Oncology
Locations: Dallas, Texas
Pricing: Quote-based
Great For: Restaurant brands, Retail brands, Healthcare brands
Website: The Loomis Agency
12. HawkSEM
About: HawkSEM is a digital marketing agency headquartered in Los Angeles, California, offering comprehensive performance marketing solutions. They provide dedicated conversion rate optimization (CRO) and experimentation services backed by their proprietary ConversionIQ technology platform.
Key Services: Conversion Rate Optimization (CRO), A/B Testing and Experimentation, PPC Management, Search Engine Optimization (SEO), Paid Social Advertising, Content Marketing
Industries Served: B2B, SaaS, Ecommerce, Finance, Healthcare, Education, Professional Services
Notable Clients: Nike, Honda, Mommy's Bliss, CarShield
Locations: Los Angeles
Pricing: Quote-based
Great For: B2B brands, SaaS brands, Ecommerce brands
Website: HawkSEM
13. Sunlight Media LLC
About: Sunlight Media LLC is a digital agency based in Los Angeles, California, offering web design, mobile app development, and digital marketing services. Their website highlights custom software development, multimedia production, and online marketing solutions for various business clients.
Key Services: Web Design, Mobile App Development, Digital Marketing, SEO
Industries Served: No industry focus stated on their own site
Notable Clients: No client publicly named on the firm's own site
Locations: Los Angeles
Pricing: Quote-based
Great For: Local and regional brands
Website: Sunlight Media LLC
Quick Comparison Table
| Agency | Key Specialty | Starting Price | Best For |
|---|---|---|---|
| 1. Web Tonic | Full-Service Performance Marketing | USD $3,000/mo | Mid-market to Enterprise |
| 2. SmartSites | Conversion Rate Optimization (CRO) | Quote-based | E-commerce brands |
| 3. Coalition Technologies | Conversion Rate Optimization | Quote-based | Ecommerce brands |
| 4. Amazon Growth Lab | Amazon PPC Management | Quote-based | Ecommerce brands |
| 5. Melleka Marketing | A/B Testing & CRO | Quote-based | Local and regional brands |
| 6. Digital Drew SEM | Google Ads / PPC | Quote-based | Local and regional brands |
| 7. Ascendly Marketing | Search Engine Optimization (SEO) | Quote-based | Local and regional brands |
| 8. 13 Stripes Marketing | Conversion Rate Optimization (CRO) | Quote-based | Local and regional brands |
| 9. Digicorns Technologies | Digital Marketing | Quote-based | Local and regional brands |
| 10. MarketCrest LLC | Conversion Rate Optimization | Quote-based | Legal brands |
| 11. The Loomis Agency | Advertising | Quote-based | Restaurant brands |
| 12. HawkSEM | Conversion Rate Optimization (CRO) | Quote-based | B2B brands |
| 13. Sunlight Media LLC | Web Design | Quote-based | Local and regional brands |
Frequently Asked Questions
What sits inside a Los Angeles conversion rate optimization engagement?
Four parts, and each belongs on its own line of the quote. Research comes first: analytics review, session recordings, heatmaps and whatever user testing the budget allows. Hypotheses follow, written so a result can settle them. Testing is third, which is where sample size, test duration and statistical significance decide whether you learn anything. Implementation is fourth, because a winning variant that never ships is a report, not a gain.
Why does this shortlist stop at twelve external firms?
Because the evidence bar removed everyone else. We started from the agencies a Los Angeles search surfaces, then read each site for conversion work on the record: testing programs described, experiment tooling named, optimisation service pages that load, and a logo of their own rather than stock art. Firms selling CRO only as a bullet under web design, and sites we could not fetch, were cut. Nothing was added to round the number up.
Which of these agencies name clients I can verify?
Three of the twelve. Amazon Growth Lab names Ray-Ban and Reebok, The Loomis Agency names Golden Chick and Salad And Go, and HawkSEM names Nike and Honda. The rest credit nobody on the pages we read, which under a confidentiality clause is ordinary rather than suspicious, though it pushes references into the first call. Ask for two tests in your own category, including one that lost, and for the numbers behind both.
How do I compare quotes when nobody publishes pricing?
Fix the deliverables before you read a figure. Since no firm here prints a rate, bids only become comparable once you have set how many tests run per month, who writes the hypotheses, whether development and design of each variant are included, which analytics and testing tools you pay for directly, how results are reported, and what happens to a winner. Two bids on one brief routinely differ threefold on those lines.
Do I have enough traffic, and does the agency need to be in Los Angeles?
Traffic decides more than geography. A test needs enough conversions per variant to settle inside a few weeks, so low-volume sites are better served by research, qualitative testing and outright redesign than by a split-testing retainer. Five of the twelve firms publish a Los Angeles address and the rest sell into the city from elsewhere: SmartSites (Paramus, New Jersey), Digital Drew SEM (New York, NY) and Ascendly Marketing (The Woodlands, TX). Proximity helps while the research is being argued out, and matters little once tests are running.
Choosing a Conversion Rate Optimization Partner in Los Angeles
Five of the twelve external firms here publish a Los Angeles address, so geography alone will not shorten this list. What separates them is whether experimentation is the core craft or a service sold under a website build.
Three credit a client you can check, and not one prints a rate. Settle how many tests a month you are buying, and who builds the winning variant, before you collect quotes.
Programs fail on volume and on implementation, rarely on ideas. Ask what conversion volume your pages need for a valid test, how long each one runs, and who ships the winner into the live site.
Whoever takes the brief, read the research plan and the reporting together, because a test with no hypothesis behind it is decoration. If you would rather hold measurement, testing and the growth program in one place, read our latest analysis or see how we work in Los Angeles.
