CRO Agencies in Los Angeles, Westside to the Valley (2026)

Los Angeles has 3.88 million people and more than 108,000 employer firms, according to US Census QuickFacts. Many of the pages selling it “LA CRO” are written by agencies based somewhere else.

We kept only agencies with an LA-area address on their own site, a CRO service and work dated in 2026. Seven made it.

Which Los Angeles CRO agency fits you?

The seven LA CRO agencies we verified for 2026 are HawkSEM, Single Grain, SDG, Propeller, Conspire, Hennessey Digital and Melleka Marketing.

• Shopify Plus stores: SDG
• DTC Shopify brands: Propeller
• Smaller Shopify stores: Conspire
• Paid search and B2B leads: HawkSEM
• Testing inside a growth programme: Single Grain
• Law firms: Hennessey Digital
• Local brands on a monthly plan: Melleka Marketing

CRO agencies by part of Los Angeles

LA’s CRO agencies cluster in three areas.

Westside

HawkSEM in Westwood, SDG in Brentwood and Propeller in Santa Monica.

Downtown and Mid-Wilshire

Single Grain on Wilshire Boulevard, with Conspire also listing a Wilshire address.

San Fernando Valley

Hennessey Digital in North Hollywood and Melleka Marketing in Van Nuys.

Los Angeles CRO agencies compared

Two of the seven publish a monthly price. Three offer a free first step.

The 7 CRO agencies in Los Angeles

Each profile gives the agency’s strength, one proof point, the first step and one thing to watch.

1. HawkSEM: PPC Plus CRO

HawkSEM has run paid search and SEO from Los Angeles since 2006, with CRO as its own service line. Its team works remotely under a Wilshire Boulevard head office.

• Strength: A/B tests tracked in its ConversionIQ dashboard
• Proof: 98% client retention, by its own count
• First step: Free consultation, then from $1,500 a month

Watch out: It suits paid-heavy lead generation more than pure ecommerce testing.

2. Single Grain: Growth Testing

Single Grain is a growth marketing agency run by Eric Siu, with a Wilshire Boulevard address in Downtown LA. CRO sits next to its SEO, paid and content work.

• Strength: A/B and multivariate tests
• Proof: 75% add-to-cart rate for the brand Füm
• First step: Strategy call

Watch out: Its CRO page is one of many service lines, so ask who runs the tests day to day.

3. SDG: Shopify Plus CRO

SDG (Spiegel Design Group) has built on Shopify since 2006 and is a Shopify Platinum Partner, based on San Vicente Boulevard in Brentwood. It takes CRO from audit to implementation.

• Strength: Shopify CRO from audit to build
• Proof: 7.5% more conversions for Framebridge
• First step: Project review

Watch out: It is built for larger Shopify Plus brands, not small starter stores.

4. Propeller: Shopify Studio

Propeller is a Shopify and Shopify Plus studio on Ocean Avenue in Santa Monica. It runs CRO inside the same team that designs and builds the store.

• Strength: Fixing product page, cart and checkout leaks
• Proof: 38% higher conversion for Aarke
• First step: Free CRO roadmap

Watch out: It works only on Shopify, so other platforms need a different partner.

5. Conspire: Shopify on a Budget

Conspire is a Shopify Premier Partner that has worked only on Shopify since 2011 and calls itself Los Angeles-based. It offers ongoing CRO or a fractional website team.

• Strength: Testing and shipping Shopify fixes
• Proof: 11% to 15% conversion lifts
• First step: Free first A/B test

Watch out: Its visible pages name Los Angeles but no street address, so confirm where the team works.

6. Hennessey Digital: Law Firm CRO

Hennessey Digital grew from founder Jason Hennessey’s SEO work, which began in 2001, and has its main office on Lankershim Boulevard in North Hollywood. Most of its clients are law firms.

• Strength: Turning visits into signed cases
• Proof: 127+ specialists, six Inc. 5000 listings
• First step: Free website diagnostic

Watch out: It focuses on legal marketing, so retailers should look elsewhere.

7. Melleka Marketing: Local Brands

Melleka Marketing works from one in-house office on Valjean Avenue in Van Nuys, where its whole team comes in daily. A/B testing and conversion tracking sit inside its marketing plans.

• Strength: A/B tests inside full marketing plans
• Proof: Plans from $2,499 a month
• First step: Pick a plan, with a three-month start

Watch out: CRO is part of a bundle, not a standalone testing programme.

Why so many LA picks are Shopify teams

Three of the seven work only on Shopify. That shapes how CRO gets done here.

• Builders ship the winners. SDG, Propeller and Conspire design, test and code changes in one team.
• Checkout is in play. Shopify Plus stores can test more of the checkout, so ask what an agency has changed there.
• Fractional teams are common. Conspire and SDG sell ongoing website teams, not just test retainers.
• Non-Shopify stores have fewer options. HawkSEM and Single Grain work across platforms.

What CRO costs in Los Angeles

Three LA agencies put numbers on their sites.

• Free first steps are common. Conspire, Propeller and Hennessey Digital start with a free test, roadmap or diagnostic.
• Bundles are not like-for-like. Melleka’s plans cover ads and SEO too, so compare scope, not just the price.
• A paid audit is a safe start. A CRO audit shows how a team thinks before a retainer.

Wrap Up

For Shopify, start with SDG, Propeller or Conspire. For paid leads, talk to HawkSEM; for law firms, Hennessey Digital.

Beyond Los Angeles, our conversion rate optimization agencies roundup covers national picks.

San Francisco agencies are covered in CRO agencies in San Francisco.

San Diego has its own list in CRO agencies in San Diego.

For the state view, see CRO agencies in California.