Most SaaS companies hire a marketing agency and immediately get the wrong one. They pick based on a polished pitch deck, not on fit with their stage or product model. Three months later, the retainer is spent and the ARR line hasn't moved.

The issue isn't that agencies are bad. It's that most weren't built with SaaS growth mechanics in mind. They run a generic channel playbook and report on traffic, not pipeline.

These three agencies are different. Each was built specifically with SaaS companies in mind, with pricing and models to match. Whether you're pre-launch or post-PMF, there's a fit here for your stage.

What are the best growth marketing agencies for SaaS?

The three agencies below all serve SaaS companies at different stages. Each takes a distinct approach to strategy, execution, and pricing.

Growth Division, our growth marketing agency, is purpose-built for tech businesses and our SaaS experience runs deep. It combines a channel-agnostic Growth Strategist with a vetted network of fractional experts. The full process runs on GREX, its proprietary AI growth operating system.

Kalungi specialises exclusively in B2B SaaS, from pre-launch through to $5M+ ARR. It embeds a fractional Chief Marketing Officer (CMO) with a full execution team under one retainer. Their T2D3 methodology is a named, published playbook tied to measurable ARR outcomes.

Hey Digital is a SaaS-exclusive paid ads agency based in Tallinn, Estonia. It focuses on driving qualified demos and signups through paid search, paid social, and a creative subscription model. It only takes on companies with product-market fit, which keeps its execution tightly scoped.

1. Growth Division: Built by Founders, for Founders

‍Disclosure: Growth Division is our own agency. We've included it because we believe it genuinely belongs on this list, but you should know we're not a neutral party.

Growth Division is a growth marketing agency built specifically for tech startups. The model sits between a traditional agency and a fractional hire. You get a channel-agnostic Growth Strategist plus vetted channel experts, swapped in and out as experiment data comes back.

The operating layer is GREX, Growth Division's proprietary AI growth operating system. It manages the full growth process across all channels. No spreadsheets, no generic reports, no guessing what's working.

Every engagement starts with a Bullseye Call, a structured session to map your go-to-market (GTM) strategy. That layer runs before any execution begins. It's what stops SaaS companies burning budget on channels that were never right for their product.

Key features

• Channel-agnostic Growth Strategist: recommendations driven by experiment data, not by what the agency sells
• GREX AI operating system: proprietary technology that manages the full growth process across all channels
• Vetted expert network: fractional specialists in paid media, SEO, content, email, and outreach
• Bullseye Framework: structured GTM strategy session run before execution starts
• Flexible terms:no long lock-ins; team composition adapts as experiment data comes in

Pricing

Growth Division charges per person per month. Channel experts cost around £1,000 per month each. A full growth team, including a Growth Strategist, typically runs £5,000 to £10,000 per month.

Pros & cons

Pros:

• Channel-agnostic strategy layer means the first recommendation isn't the channel the agency happens to sell
• GREX is a genuine operating system, not a spreadsheet rebranded as a growth tool
• Flexible terms mean you're not locked in while the channel mix is still being validated
• Built by startup founders who've lived the same scaling problem their clients face
• 130+ startups served, with a Clutch rating of 4.7/5 across 31 reviews

Cons:

• GREX is an internal tool (as of writing this article), so it's hard to evaluate before committing to a retainer
• £5,000 to £10,000 per month sits at the top of what most early-stage SaaS founders budget
• US-based founders may find less local ecosystem presence compared to UK clients

Customers

Growth Division has worked with 130+ startups across the UK, US, and Europe. Named clients include Oddbox, Ecologi, SeedLegals, Weavr, Prolific, stability.ai, and Tutorful. It holds a 4.7/5 rating on Clutch across 31 reviews.

Musiversal scaled from $100k to $1.2M ARR in 12 months under Growth Division's management. Sasha from Unlock reported 100+ demos booked in the first 3 months and 14 won customers from Google Ads.

"In the first 3 months we got 100+ demos booked. Google Ads achieved an 8% CTR and we closed 14 won customers. Growth Division was absolutely vital to this success."
Sasha, Unlock

2. Kalungi: Fractional CMO Plus Full SaaS Execution Team

Kalungi is a Seattle-based agency founded in 2018, focused exclusively on B2B SaaS. Their positioning is direct: they're the number one B2B SaaS marketing agency. That claim is backed by a 4.9/5 rating on Clutch across 35+ reviews.

The core offer is a fractional CMO with a full execution team underneath. Strategy and delivery come from one accountable team, not separate vendors. That's the gap most SaaS founders face when they're too early for a CMO hire but too late for guesswork.

Kalungi's methodology is called T2D3: triple, triple, double, double, double ARR. It's a published B2B SaaS growth playbook, not a vague framework repackaged for each client. That specificity makes it easier to evaluate before you even get on a call.

Key features

• T2D3 methodology: a published B2B SaaS growth playbook built around tripling, tripling, doubling, doubling, and doubling ARR
• Fractional CMO as a Service: strategic leadership embedded with a full execution team beneath it
• Four engagement tiers: Full Service, Syntropy, T2D3 Masterclass, and CMO Coaching, each scaling to your stage
• Pay-for-performance model: fees tied to client outcomes, with 3 to 5x— average ROI claimed
• 150+ SaaS clients: proprietary Atlas HubSpot theme and Figma design system included across engagements

Pricing

Kalungi's full-service engagement starts at around $45,000 per month. CMO Coaching, their lightest tier, starts from around $6,500 per month. Both tiers require a minimum initial engagement before moving to month-to-month.

Pros & cons

Pros:

• 4.9/5 Clutch rating across 35+ reviews is among the strongest verified social proof in this comparison
• T2D3 is a named, published playbook that's easy to evaluate before committing to a call
• Fractional CMO model removes the headcount cost of a full-time senior marketing hire
• Pay-for-performance structure creates accountability that most flat-retainer agencies don't offer
• 150+ B2B SaaS clients means the team understands the buyer journey in detail

Cons:

• Full-service pricing at $45,000 per month is out of reach for most seed-stage SaaS founders
• US-only focus means limited UK or European startup market presence
• Strong HubSpot and inbound bias may not suit teams wanting channel-agnostic discovery first
• B2B SaaS only, so not relevant for B2C, consumer tech, or non-SaaS products

Customers

Kalungi has worked with 150+ B2B SaaS companies. Named clients include DataGuard, CPGvision, Avid, Patch, Fraxion, Beezy, iControl, and Aware360. Its 4.9/5 Clutch rating across 35+ reviews reflects strong and consistent client satisfaction.

The agency reports a 3 to 5x, average ROI across engagements. That outcome-linked model is rare in a market full of flat-retainer agencies.

3. Hey Digital: SaaS-Exclusive Paid Ads and Creative Subscription

Hey Digital is a B2B SaaS-focused paid ads agency founded in 2018 in Tallinn, Estonia. It operates with a remote team across Europe and North America. The agency has worked with 125+ SaaS companies, including Hotjar, PostHog, Pitch, and Sprig.

What makes Hey Digital different is its SaaS-only model. It doesn't take on non-SaaS clients, which means the team understands the SaaS buyer journey inside out. Every campaign is built around driving qualified demos and signups, not traffic.

The creative subscription model is a genuine differentiator. It gives SaaS teams a recurring stream of ad creative without the overhead of an in-house studio. You can add it alongside a full management retainer, or run it as a standalone tier.

Key features

• SaaS-exclusive positioning: deep knowledge of SaaS buyer journeys, demo funnel conversion, and subscription metrics
• Creative-as-a-Subscription: recurring delivery of ad creative assets, available separate from the full management retainer
• Full-funnel PPC: dedicated landing page design and A/B testing included alongside ad management
• Conversion tracking: regular Slack performance updates and cross-channel attribution tracking
• Video ads and conversational marketing: Drift integration alongside paid search and paid social management

Pricing

Hey Digital's minimum project size starts at $5,000. Hourly rates run $100 to $149. The creative subscription tier is available as a standalone product separate from the full management retainer.

Pros & cons

Pros:

• SaaS-exclusive model means no generic playbook applied to your product
• Creative subscription gives a reliable stream of ad assets without hiring in-house
• Tallinn-based cost structure means competitive rates versus agencies in London or New York
• PMF-gated entry reduces wasted spend by filtering out companies not yet ready to scale
• Strong SaaS client list includes Hotjar, PostHog, Pitch, Sprig, and UserTesting

Cons:

• Paid media only, with no SEO, content, email, or outreach capability
• Requires product-market fit, which excludes pre-PMF SaaS companies from working with them
• Lower Clutch review volume (4 reviews) limits social proof despite a solid 4.6/5 rating
• No strategic GTM layer before execution, assumes channel direction is already decided

Customers

Hey Digital has worked with 125+ B2B SaaS companies. Named clients include Hotjar, Wiza, PostHog, Pitch, Sprig, Writesonic, UserTesting, Adjust, and Fathom. Its Clutch rating of 4.6/5 comes from 4 reviews, lower volume than others on this list but reflecting a boutique, specialist model.

The Tallinn-based team offers a cost-competitive alternative to equivalently positioned agencies in London or New York. That pricing advantage matters for SaaS companies managing customer acquisition cost (CAC) carefully.

Frequently asked questions

What makes a growth marketing agency right for SaaS companies?

SaaS growth has specific mechanics that generalist agencies often miss. Activation rates, freemium-to-paid conversion, and product-led loops all require a different approach than eCommerce or lead gen. An agency built for SaaS will know which levers to pull at each stage.

Do I need channel discovery or paid media execution?

If you haven't validated a scalable channel yet, start with discovery. Paid execution is the right move once you know what works and want to scale it. The mistake is paying for execution before the strategy is clear.

What's the difference between a fractional CMO and a growth marketing agency?

A fractional CMO provides strategic leadership, typically without a delivery team underneath. A growth marketing agency handles both strategy and channel execution. Some agencies, like Kalungi, combine both by embedding a fractional CMO with a full execution team.

When should a SaaS company hire a growth marketing agency?

The right time is when you have product-market fit and a budget to test channels consistently. Below £3,000 to £5,000 per month, most agencies can't deploy resources effectively. If you're pre-PMF, a fractional advisor is usually a better fit than a full agency retainer.

How long does it take to see results from a growth marketing agency?

The first one to three months are typically about testing and finding what works. Months three to nine usually produce the first reliable, scalable channels. Expect to commit at least six months before evaluating whether an agency is the right fit.

How do I compare pricing across agencies with different models?

Don't compare retainer costs alone. Factor in what's included: strategy, execution, tooling, and how many specialists are deployed. A £5,000 retainer with strategic oversight and five channel experts looks very different from a single-channel one at the same price.

Conclusion: Match the Agency to Your SaaS Stage

Each agency on this list solves a different SaaS growth problem. The right one depends on your stage, budget, and how much strategic direction you still need.

For seed to Series B SaaS founders who need to find scalable channels, Growth Division is the strongest fit. Its Bullseye Framework and the GREX system are built for exactly this stage. Book a Bullseye Call and start with a GTM strategy before any spend begins.

If you're a funded B2B SaaS company looking for a fractional CMO, Kalungi is worth a conversation. Their T2D3 methodology and pay-for-performance model give more accountability than most flat-retainer agencies. Factor in the $45,000 per month starting point before committing to a call.

If paid ads are your primary channel and you've got product-market fit, Hey Digital is a strong option. Their SaaS-only model and creative subscription offer depth that generalist paid agencies rarely match. Just know they won't take you on before PMF is clear.