Flowium

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.
• Klaviyo Elite
• email+SMS retention for mid-market DTC
• Based in New York

What Flowium is

Flowium is a Klaviyo Elite Master retention marketing agency serving ecommerce and DTC brands, founded in 2017 and reporting more than 1,000 brands served. Its core service is full-service email and SMS management: Klaviyo account setup and optimization, flow strategy (welcome, abandoned cart, browse abandonment, post-purchase, win-back) and ongoing campaign planning and execution.

Beyond email, Flowium activates additional lifecycle channels such as SMS, WhatsApp, RCS, push notifications and Instagram DM automation depending on client needs, positioning itself as a full lifecycle marketing partner rather than an email-only vendor. Engagements are typically retainer-based, covering strategy, copywriting, design and continuous A/B testing.

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 klaviyo elite, email+sms retention for mid-market dtc, 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.

Flowium's Klaviyo Elite Master status and reported $352M+ in attributed email revenue across clients reflect deep, specialized Klaviyo expertise rather than generalist marketing services.

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

• Klaviyo Elite
• email+SMS retention for mid-market DTC
• Based in New York
• Specialist team rather than a generalist marketing shop
• Hands-on execution: strategy, creative and campaign delivery

Pricing tiers

Flowium is a paid product. Custom retainer pricing based on brand size and scope, quoted after a strategy call; the agency does not publish flat rate cards and typically serves established ecommerce brands rather than very early-stage stores.

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

Flowium is commonly wired into Klaviyo, Shopify, Shopify Plus, BigCommerce, Magento, Salesforce Commerce Cloud, WhatsApp, SMS/RCS platforms and Instagram DM automation tools. 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 Flowium 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.

As a full-service retainer agency, Flowium is built for brands with meaningful revenue already flowing through email/SMS rather than very small or pre-revenue stores, and pricing is not transparent until a discovery call.

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

flowium.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. Flowium 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 Flowium 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.

As a Klaviyo-focused agency, Flowium manages deliverability primarily through list hygiene, sending cadence and segmentation best practices within Klaviyo rather than offering independent inbox placement tooling of its own.