Avex

Key points

• Category: Agencies: eCommerce retention
• Pricing: Paid
• Best for: Brands looking for an agency partner for Klaviyo-led retention and lifecycle work for DTC and eCommerce brands.
• Shopify Plus agency with Klaviyo retention practice
• Based in New York

What Avex is

Avex (Avex Designs) is a New York-based Shopify Plus commerce agency and Klaviyo Platinum Master partner serving mid-market and enterprise brands such as AriZona Beverages, KHAITE, Equinox and FILA. Retention marketing, covering Klaviyo email, SMS, loyalty and subscription programs, is one of several disciplines it offers alongside ecommerce strategy, UX/CRO and platform migrations, with email framed as the highest-ROI channel in its retention practice.

Its retention team manages full lifecycle flows (welcome, post-purchase, browse and cart abandonment, win-back, replenishment, VIP, sunset) plus monthly campaign strategy, segmentation, A/B testing and deliverability monitoring as an embedded extension of a brand's marketing team, and it also integrates the tech stack across ad platforms and tools like Recharge, Gorgias and Yotpo.

It sits in the agencies: ecommerce retention part of an email stack - klaviyo-led retention, lifecycle and sms teams for dtc brands. In practice it is the right pick when your priority is: brands looking for an agency partner for klaviyo-led retention and lifecycle work for dtc and ecommerce brands.

What it does well

The capabilities teams rely on most are shopify plus agency with klaviyo retention practice, based in new york. Taken together these cover the day-to-day work in this category, and they are the features worth testing during a trial rather than reading about.

Avex frames retention as one connected system spanning email, SMS, loyalty and subscription infrastructure rather than isolated campaigns, and its enterprise client roster (Equinox, FILA, KHAITE) reflects experience with complex, high-volume commerce operations.

In real use the strongest points people report are specialist team rather than a generalist marketing shop; hands-on execution: strategy, creative and campaign delivery.

Key features

• Shopify Plus agency with Klaviyo retention practice
• Based in New York
• Specialist team rather than a generalist marketing shop
• Hands-on execution: strategy, creative and campaign delivery

Pricing tiers

Avex is a paid product. Project-based and retainer pricing scoped per client; its Shopify partner listing shows a starting price point around $10,000, reflecting its focus on larger, more complex brands rather than small merchants.

Pricing pages move often, so confirm the current figures with the vendor before you budget. The number worth modelling is not the licence fee on its own but the cost per delivered email once bounces, suppressed contacts and spam-foldered sends are taken out.

Ideal customer profile

• Best fit: Brands looking for an agency partner for Klaviyo-led retention and lifecycle work for DTC and eCommerce brands.
• Where it sits in the stack: Agencies: eCommerce retention - klaviyo-led retention, lifecycle and sms teams for dtc brands.
• Budget profile: Paid - suited to teams comfortable with this commercial model.
• Probably not for you if: retainer pricing - not a self-serve tool would block your team.

What it connects to

Avex is commonly wired into Klaviyo, Shopify Plus, Google Ads, Recharge, Gorgias, Yotpo, Salesforce and Attentive. Check that the specific objects and events you rely on are covered, not just that a logo appears on the integrations page - shallow connectors are a frequent source of rework.

Where it falls short

No tool in this space is complete on its own. With Avex the trade-offs to plan around are retainer pricing - not a self-serve tool; deliverability and sending reputation usually stay your responsibility. None of these are reasons to avoid it - they are the gaps another layer of your stack needs to fill.

Its enterprise and mid-market focus with a higher project starting price means the agency is a better fit for established brands with meaningful budgets than early-stage or very small ecommerce sellers.

A useful test before committing: send a real campaign through your intended setup, then check where it actually lands across Gmail, Outlook, Yahoo and your customers' corporate filters. Tooling that looks identical on a feature list often behaves very differently once reputation and authentication are involved.

The essentials

Category

Agencies: eCommerce retention

Pricing model

Paid

Vendor

avexdesigns.com

G2 rating

Not listed

Best for

Brands looking for an agency partner for Klaviyo-led retention and lifecycle work for DTC and eCommerce brands.

Works alongside Warmy

Yes - warm-up, placement, DMARC

How it fits a deliverability stack

Deliverability is decided by four things: the reputation of the sending domain and mailbox, the quality of the list, correct SPF, DKIM and DMARC authentication, and proof of where mail actually lands. Avex covers part of that picture. The mistake most teams make is buying four separate products for those four jobs and still having no single place that tells them whether the last campaign reached the inbox.

Warmy runs warm-up, inbox placement testing, email verification and DMARC monitoring as one platform, which is why Avex usually sits alongside it rather than against it: it keeps doing what it is good at, while reputation, placement and authentication are handled in one loop.

Deliverability monitoring is included as part of ongoing email program management rather than sold as a discrete audit or tool.