The Best Growth Agencies for Startups in 2026

By Tom Dewhurst, Co-founder, Growth Division · Updated October 2026

Short answer: the best growth agency for a startup depends on its stage. At pre-seed and seed, when you haven't found a reliable channel, choose Growth Division for channel discovery, Kurve for a hybrid agency-and-consultancy model (especially for mobile apps) or Right Side Up for vetted senior freelancers in the US. At Series A, when one channel works and you need to scale it, choose Ladder for paid acquisition, Gripped for UK B2B SaaS or Kalungi for US B2B SaaS with a fractional CMO. At Series B, choose NoGood for premium, AI-native full-stack growth or Growth Hackers if you're selling into many countries at once.

Disclosure: Growth Division is our agency. It's listed first for transparency, not as a ranking. No agency paid to be included.

Founders often buy a growth agency like insurance: a safe-sounding name, a proposal that promises everything, a signature that ends the search. Six months later the channel mix hasn't moved and the reporting deck looks like month one. Usually the agency wasn't bad. It was the wrong model for the stage the startup was at. This guide matches eight agencies to the stage they suit. If you'd rather shortlist by specialism (paid, SEO, product-led, analytics), see our top 7 growth marketing agencies for startups.

How we compiled this list

• Agencies we've worked alongside or competed with. We've run growth for 130+ startups and scale-ups since 2019, so we meet these agencies in pitches and handovers.
• Agencies recommended by clients and peers. Founders we work with told us who they'd shortlisted and why.
• Each agency's own site, public case studies and pricing pages, checked October 2026. We only repeat what an agency publishes about itself. Where pricing isn't public, we say so.
• Inclusion criteria: the agency works with startups (not only enterprise), runs more than one channel or a clear growth method, and is open about who it suits.

What to look for

• A fit with your stage. Channel discovery and channel scaling are different jobs. Ask which one the agency is built for.
• Strategy before spend. If an agency recommends its own speciality before it has looked at your data, it is selling a channel, not growth.
• Pricing you can sustain for 6 months. Most agencies need 3–6 months before results are reliable. If you can only fund 3, you'll judge it too early.
• Named people. Ask who will run your account each week and how senior they are.
• Reporting against one number. Weekly reporting against a North Star Metric beats a monthly deck of vanity metrics.

Compare the shortlist at a glance

Shortlist by stage

Pre-seed and seed: you're still finding your channel. Your problem is not scale. It's that you don't yet know which 1–2 channels will work. You need an agency that tests several cheaply and tells you what to stop. Budgets are usually under £10,000 a month. Look at Growth Division, Kurve and, if you're in the US and already know the role you need, Right Side Up.

Series A: one channel works, now scale it and find the second. You have a channel with real numbers behind it. The risk now is hitting a ceiling on it. You need execution depth and attribution you trust. Look at Ladder (paid-led), Gripped (UK B2B SaaS) and Kalungi (US B2B SaaS). Growth Division also fits here if your second channel is still unproven.

Series B: scale across channels and markets. You have budget, a marketing leader and a board asking for efficient growth. You need capacity, creative and coverage across many channels. Look at NoGood, Ladder, Gripped's full demand generation tier and Growth Hackers if you're expanding internationally.

1. Growth Division: best for pre-seed to Series A startups still finding their channel

Growth Division is a London growth marketing agency, founded in 2019 by me and Tristan Gillen, built for tech startups. You get a channel-agnostic Growth Strategist plus vetted channel experts, not a single-channel team. We use the Bullseye Framework to pick 3–6 channels to test, run structured experiments, then scale what works and swap experts in and out as the data comes back. That structure exists to remove the most common agency bias: recommending whatever channel the agency sells.

Delivery runs on GREX, our AI growth operating system, which came out of an internal hackathon in 2024 and is now also a standalone platform at grex.ai. GREX reads a client's knowledge base and connected tools, builds ICPs and strategy, structures experiments and tracks velocity. It runs agentic workflows across LinkedIn outbound, cold email, paid social and content. A named senior person reviews everything before it ships. We report weekly against a North Star Metric.

The trade-off: we've run growth for 7 years, but GREX is newer, so there's less data on how much the tool itself adds to results. The early data is positive but limited. Our price also sits at the top of what many pre-seed founders can commit to.

At a glance - Website: https://growth-division.com/ - HQ: Clerkenworks, 40 Bowling Green Lane, London EC1R 0NE - Specialisms: channel-agnostic growth strategy (Bullseye Framework), structured experimentation, paid media, SEO, GEO, content, email and outbound through a vetted specialist network, GREX AI - Stage fit: pre-seed to Series A, and Series B teams whose next channel is unproven - Best-fit client: UK and European tech founders without a senior marketing lead who need to know what to double down on - Pricing: transparent retainer, typically £4,000–£9,000 (+VAT) a month for 3–6 channels. Priced per person: channel experts around £1,000 each a month, plus a Growth Strategist. Flexible terms, no long lock-in. - Clients and proof: 130+ startups and scale-ups across the UK, US and Europe, including Oddbox, Ecologi, SeedLegals, Weavr, Prolific, Stability.ai and Tutorful. Weavr: 4 channels validated, 35x ROAS on search, 390+ MQLs in 12 months. Optic: Google Ads CPL cut from $70 to $10, daily signups tripled. Addland: CPAs down an average 26.5% a month while paid spend scaled 11x. 4.7/5 on Clutch across 31 reviews. Sasha at Unlock: "In the first 3 months we got 100+ demos booked. Google Ads achieved an 8% CTR and we closed 14 won customers." - Not a fit if: you already know your top 1–2 channels and only want execution at scale, or you can't commit around £4,000 a month for at least 3–6 months.

2. Kurve: best for seed-stage SaaS and mobile app founders who want strategy without full execution

Kurve is a London agency founded in 2013 and led by founder and Fractional CMO Oren Greenberg. It runs a hybrid model: hire it for execution, strategic advisory or both, on a monthly retainer or a project fee. Its seven-stage Experiment Framework (Define, Capture, Prioritise, Create, Implement, Analyse, Repeat) scores tests on impact, confidence and ease, so founders can see why something gets tested first.

Its mobile depth is unusual for a startup agency. Its work with Sweatcoin, a category leader in 119 countries, covers app store optimisation (ASO) and user acquisition that most growth agencies don't offer. B2B SaaS messaging is run as a separate specialism.

At a glance - Website: https://kurve.co.uk/ - HQ: London - Specialisms: hybrid agency and consultancy, seven-stage experiment framework, mobile ASO and user acquisition, B2B SaaS messaging - Stage fit: seed to Series A, especially app-first products - Best-fit client: SaaS and mobile app founders who want strategic thinking before committing to full execution - Pricing: monthly retainer or project fee, scoped per client. Rates on request. - Clients: Sweatcoin, Treecard, Nutmeg - Not a fit if: you want an AI operating system or experiment-tracking layer, or you're a non-app SaaS or e-commerce business. Public social proof is thinner than the larger agencies here.

3. Right Side Up: best for US, VC-backed startups that need senior talent in days

Right Side Up is a San Francisco company founded around 2015. It's a talent network rather than a traditional agency: it sources and vets senior fractional marketers and has run more than 1,000 client partnerships. You can hire an individual freelancer, a full growth team or a full-time placement. Its own vetting technology matches talent to the brief, and a team can start in as little as two days.

It has the widest channel coverage on this list, including offline formats such as podcast, radio, TV and direct mail. It also places talent directly into VC and PE portfolio companies.

At a glance - Website: https://rightsideup.com/ - HQ: San Francisco - Specialisms: vetted senior fractional marketers, full growth teams, full-time placement, offline and digital channels - Stage fit: seed to Series B, when speed to staff matters most - Best-fit client: US, VC-backed startups that already know which role or channel they need filled - Pricing: premium, not published. Scoped against senior fractional rates. On request. - Clients: HoneyBook, Yelp, Rocket Money, Uber and multiple a16z portfolio companies - Not a fit if: you need someone to decide your channel strategy first, or you're UK or Europe-based. Quality depends on the individual placed rather than a consistent team.

4. Gripped: best for Series A UK B2B SaaS teams that want paid, SEO and AI search under one team

Gripped is a London agency founded in 2017 that works only with B2B SaaS, AI and tech companies, roughly £2M to £50M ARR. It's our closest same-market competitor. Its structural difference is breadth under one roof: demand generation, paid media, SEO and Generative Engine Optimisation (GEO) sit with the same team, and pipeline and revenue attribution are built in from day one. Founders Steve Eveleigh and Ben Crouch have worked in B2B SaaS since 2004. The team is 36 people across five continents.

The trade-off: there's no channel-agnostic strategy step before execution, as paid media is assumed from the start. Typical spend also sits above what most startups under £2M ARR can commit to.

At a glance - Website: https://gripped.io/ - HQ: London - Specialisms: B2B SaaS demand generation, paid media, SEO, GEO, revenue-to-pipeline attribution - Stage fit: Series A to Series B (around £2M–£50M ARR) - Best-fit client: UK B2B SaaS, AI and tech companies that want one accountable team for paid and organic - Pricing: advisory or single-channel from £3,500 a month. Full multi-channel demand generation from £15,000 a month. Most clients pay £8,000–£12,000. Media budgets (£5,000 to £150,000+) billed separately. - Clients: Ideagen, Epicor, Ravelin, Crownpeak and 160+ other B2B SaaS and tech companies. 4.9/5 on Clutch across 32 reviews. - Not a fit if: you're pre-£2M ARR, consumer or marketplace, or still unsure whether paid should be a core channel.

5. Ladder: best for Series A startups scaling a paid channel that already works

Ladder is a New York agency founded in 2014, with offices in London and Wrocław, Poland. It covers the full funnel: paid traffic (Meta, Google, TikTok, LinkedIn, programmatic), conversion rate optimisation (CRO) and lifecycle retention. Its proprietary Nucleus™ AI powers what it calls Adaptive Growth Teams, whose make-up changes month to month based on what the data shows. That's close to our own model, and Ladder demonstrates Nucleus™ to prospects, which makes it easier to judge than an internal-only tool.

It works with everyone from Y Combinator startups to Fortune 500 brands. That range has stress-tested its process, which helps once a channel is proven and just needs scaling.

At a glance - Website: https://ladder.io/ - HQ: New York (offices in London and Wrocław) - Specialisms: paid acquisition across major platforms, CRO, retention marketing, landing page testing, app store optimisation, Nucleus™ AI - Stage fit: Series A to Series B - Best-fit client: startups with a working paid channel and budget to scale it, across consumer, fintech and marketplaces - Pricing: minimum project $10,000. Typical projects range from $3,500 to $300,000+ depending on scope. - Clients: Facebook, Nestle, Monzo, Booking.com, BlockFi, Travelex, Timeout - Not a fit if: you haven't validated a channel yet (there's no pre-execution GTM strategy step), or you're a lean seed team that will find enterprise process overhead slow.

6. Kalungi: best for US B2B SaaS that wants a fractional CMO plus execution

Kalungi is a Seattle agency founded in 2018 that works only with B2B SaaS companies, from pre-launch to roughly $5M ARR. It calls its model "GTM-as-a-Service": a fractional Chief Marketing Officer (CMO) leading the execution team underneath. It runs on its own published methodology, T2D3 (triple, triple, double, double, double ARR growth). Tiers run from CMO Coaching to Full Service, and some fees are tied to outcomes rather than a flat retainer.

The named framework gives founders something concrete to hold the agency to, and the fractional CMO answers the "who owns strategy?" question many startups can't. It reports 150+ SaaS clients and a 3–5x average ROI.

At a glance - Website: https://kalungi.com/ - HQ: Seattle - Specialisms: fractional CMO, B2B SaaS go-to-market, T2D3 methodology, pay-for-performance fees - Stage fit: pre-launch to Series A on the coaching tiers; Series A and up for Full Service - Best-fit client: US B2B SaaS founders without a marketing leader - Pricing: CMO Coaching and Syntropy tiers on request. Full Service from $50,000 a month, per Kalungi's FAQ. - Clients: DataGuard, CPGvision, Avid, Patch, Fraxion, Aware360 and 150+ SaaS clients overall. 4.9/5 on Clutch across 35+ reviews. - Not a fit if: you're UK or Europe-based (it's US-only), or you're consumer or marketplace (it's B2B SaaS only).

7. NoGood: best for well-funded Series B startups that want premium, AI-native full-stack growth

NoGood is a New York agency with offices in Miami and San Francisco. It calls itself an "AI-native growth squad" and builds a bespoke team for each client rather than selling a fixed service menu. Its standout capability is Answer Engine Optimisation (AEO): optimising content for ChatGPT, Gemini, Perplexity and AI Overviews as well as traditional search. Paid, organic, performance creative (static, motion, UGC), PR, data science and growth engineering sit in-house, which cuts the number of vendors you manage.

It reports an 84% client retention rate and TechCrunch-verified expert status. Its pricing assumes you're already funded and past product-market fit.

At a glance - Website: https://nogood.io/ - HQ: New York (offices in Miami and San Francisco) - Specialisms: AI-native growth squads, AEO, performance creative, data science, growth engineering - Stage fit: Series B and later - Best-fit client: funded startups in SaaS, fintech, healthcare and AI with product-market fit - Pricing: average retainer $20,000+ a month - Clients: Nike, TikTok, MongoDB, Intuit, Amazon, Anthropic, AWS, Oura, Spring Health - Not a fit if: you're seed-stage or budget-constrained, or you need depth in the UK or European market.

8. Growth Hackers: best for startups selling into many countries from day one

Growth Hackers is a global, remote-first agency founded in 2016 and led by CEO Jonathan Aufray, who has operated across more than 90 countries. It's a full-stack shop covering strategy through delivery: SEO, paid media, content, email, ASO, branding and web design. It has added GEO alongside traditional SEO for AI-generated answers.

It reports $180M+ in revenue generated for clients and 750M+ website visitors across engagements. Its track record spans gaming, edtech, SaaS and travel.

At a glance - Website: https://growth-hackers.net/ - HQ: global, remote-first - Specialisms: full-stack growth execution, SEO plus GEO, paid media, content, email, ASO, branding and web design - Stage fit: any stage, if you're multi-market from launch; most useful at Series A–B - Best-fit client: founders launching in several countries at once who want one vendor for strategy, creative, development and performance - Pricing: not published. Scoped per engagement. On request. - Clients: Voodoo, Qlik, Artisan Talent, Saigon Dragon Studios; 80+ companies globally - Not a fit if: you want a channel-agnostic discovery process (it works more like a full-service shop), or you need deep knowledge of one regional ecosystem such as the UK.

Which should you choose?

• If you're pre-seed or seed and don't know your channel yet → Growth Division.
• If you're seed-stage, app-first and want strategy before full execution → Kurve.
• If you're US-based, VC-backed and know exactly which role you need, fast → Right Side Up.
• If you're a UK B2B SaaS company past ~£2M ARR and want paid, SEO and GEO in one team → Gripped.
• If paid acquisition already works and you need to scale it → Ladder.
• If you're US B2B SaaS without a marketing leader → Kalungi.
• If you're Series B, funded and want a premium full-stack team with AI search built in → NoGood.
• If you're launching in several countries at once → Growth Hackers.
• If you're pre-product-market fit → don't hire a full-service agency yet. A strategy-only engagement or fractional advisor is cheaper and more useful.

FAQs

How much does a growth agency for startups cost in 2026?

Entry points start around £3,500 a month (Gripped's advisory tier). Channel-agnostic growth teams like ours typically run £4,000–£9,000 (+VAT) a month for 3–6 channels. Ladder's minimum project is $10,000, NoGood's average retainer is $20,000+ a month and Kalungi's Full Service starts at $50,000 a month. Media spend is almost always billed on top.

How do I vet a startup marketing agency before signing?

Ask who will run your account each week and see their CV. Ask for a case study from a company at your stage, not just the agency's biggest logo. Ask what they'd recommend you stop doing, and how they'd decide. Check reviews on a third-party site such as Clutch, and agree the one metric you'll judge them on before you start.

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

A traditional agency usually leads with one channel (SEO, paid or content) and builds a retainer around it. A growth agency should run structured experiments across channels and follow the data. Many "growth agencies" still lean on one channel in practice, so check what they actually execute.

Should a pre-product-market-fit startup hire a growth agency?

Usually not a full-service one. Agencies like NoGood and Gripped work best once product-market fit is in place. Pre-PMF founders get more from a fractional advisor or a strategy-only engagement that tests positioning and a few cheap channels.

What does "channel-agnostic" mean, and why does it matter at seed stage?

It means the agency picks channels from your data and audience, not from what it happens to sell. At seed stage you don't yet know which channel will work, so an agency that only does paid or only does SEO is making that bet for you. A channel-agnostic agency tests several and cuts the losers.

How long should a startup give a growth agency before judging it?

Plan for 3–6 months. The first 1–3 months are mostly testing and cutting what doesn't work. Reliable channels usually show up between months 3 and 9. If an agency can't show what it learned in the first 90 days, that's the warning sign.

Not sure which channel to bet on? Book a free 1-hour Bullseye Strategy Session → /contact-us

Agency details checked October 2026 from each agency's own site and public listings. They change, so confirm before you sign.