Short answer: the best B2B SaaS marketing agencies in Spain understand that selling subscription software is not like selling any other service: the sales cycle has its own metrics (CAC, MRR, churn, LTV), the decision is made by several technical and commercial profiles, and acquisition has to feed not just the first sale but retention and expansion too. The four agencies we compare here (iGrowth, Kimoon, COSEOM and Desorbitante) tackle that challenge from different angles: two hyper-specialized in SaaS, one expert in international SEO for software, and one that operates the entire acquisition system. This guide explains where each one fits so you choose based on your situation, not on who has the nicest website.
This comparison is written by Nicolás Stocchero, Managing Director of Desorbitante, which also appears on the list. We say so for transparency, and because comparing with judgment means recognizing what each option is best for, not just defending your own.
Why does a B2B SaaS need a specialized agency?
A B2B SaaS needs an agency that understands its model because the growth levers of subscription software are different from those of other businesses. The metric that rules is not the one-off sale but recurring revenue: how much it costs to acquire a customer (CAC), how long it takes to recover that investment (CAC payback), how much that customer is worth over their lifetime (LTV) and how many leave each month (churn). A generalist agency can generate leads, but if it does not think in these metrics, it may bring in customers who cancel within three months and destroy your unit economics.
On top of that, in B2B SaaS the buying decision is rarely made by a single person. There is usually a user who tries the product, a technical lead who validates the integration and an economic decision-maker who approves the budget. Acquisition has to speak to all three with the right message at each stage. That is why specialization matters: it shortens the learning curve and reduces the risk of burning budget on messages that do not land.
What makes SaaS acquisition different?
SaaS acquisition differs in four concrete ways. First, the product can be tried: the demo and the trial are the key conversion moment, so acquisition has to optimize for qualified demos, not just generic meetings. Second, the market is usually international from day one, which demands multilingual capability and an understanding of several markets at once. Third, technical content (comparisons, integrations, use cases) carries more weight than in other sectors, because the buyer researches thoroughly before talking to sales. And fourth, retention is part of growth: a good SaaS agency thinks about the full cycle, not just filling the top of the funnel.
Criteria for comparing B2B SaaS agencies
We evaluate each agency against explicit criteria that are relevant to the SaaS model:
SaaS specialization: whether subscription software is its exclusive focus or one sector among several.
Understanding of SaaS metrics: whether it reasons in terms of CAC, MRR, churn and LTV, or only in lead volume.
Channels it runs: outbound, paid media, SEO, content, and whether it coordinates them under a single strategy.
Optimization for qualified demos: whether acquisition aims at demos and trials, not just meetings.
International reach: whether it can operate across several markets and languages, which is common in SaaS.
Service model: whether it delivers leads, runs prospecting or manages the entire acquisition system.
Deliverability control: whether it manages sending domains and reputation in email campaigns.
Comparison table of B2B SaaS marketing agencies
| Agency | SaaS specialization | Main focus | Outbound operated | Paid media | SEO/content | Full system | Best for |
|---|---|---|---|---|---|---|---|
| iGrowth | Exclusive to B2B SaaS | Scaling from 1 to 10M/year | Yes | Yes | Yes | Partial | SaaS scaling recurring revenue with a dedicated partner |
| Kimoon | 100% B2B, SaaS focus | Funnels and demand for SaaS | Partial | Partial | Yes | No | SaaS that want multichannel demand and optimized funnels |
| COSEOM | SaaS, FinTech, software | International SEO + paid | No | Yes | Yes (core) | No | SaaS that grow through search across several markets |
| Desorbitante | Multi-vertical, serves SaaS | End-to-end acquisition system | Yes | Yes | Partial | Yes | SaaS that outsource the entire acquisition engine |
Profiles of each agency
iGrowth
A Barcelona agency hyper-specialized and exclusively focused on B2B SaaS. Its proposition boils down to scaling a SaaS from 1 to 10 million a year through complete acquisition, conversion and retention systems, working as an extension of the client’s team. It masters the particulars of the subscription model and reasons in its metrics. It is the best option if your company is a SaaS and you want a partner that lives and breathes that model, over a generalist provider. It is less suited if you operate outside software or if you want a provider that also runs campaigns in non-SaaS sectors. We look at this in detail in Desorbitante versus iGrowth.
Kimoon
A 100% B2B agency hyper-specialized in SaaS companies looking to scale without depending on a single channel. It works on solid funnels, landing pages, email and conversation automation, with the focus on turning visits into demos and demos into customers. It has its own seven-phase framework. It is a good choice for a SaaS that wants an agency centered on its model and on demo conversion, with a methodical approach. It is less suited if you need an operator that also manages a strong multi-platform paid media layer or your full CRM. We look at this in detail in Desorbitante versus Kimoon.
COSEOM
An agency headquartered in Barcelona with an international presence, specialized in international SEO, demand generation and account-based marketing, with experience in SaaS, FinTech and software, running natively across several markets and languages. Its core is search visibility and optimization for generative engines at international scale. It is the best option if your SaaS grows mainly through organic search and you need to rank in several countries at once. It is less suited if your priority is outbound prospecting (cold email, LinkedIn), which is not its focus.
Desorbitante
A B2B growth agency that designs, operates and optimizes the customer acquisition system end to end for Spain and LATAM, serving SaaS within a multi-vertical approach. It combines outbound (cold email and LinkedIn), paid media (Meta, Google, LinkedIn and TikTok), proprietary data with intent signals, managed sending infrastructure and an operated CRM, all measured in a real-time dashboard. More than 70 B2B companies have worked with this model, with reply rates around 38% and cases of ROAS of up to 30 times. It is the best option for a SaaS that wants to outsource the entire acquisition engine under a single operation, instead of coordinating several providers. It is less suited if you are after the exclusive SaaS hyper-specialization of a partner dedicated only to that vertical, or if your growth depends almost entirely on SEO. You can see how we approach the sector in our solution for software and SaaS.
How to choose a B2B SaaS marketing agency?
The choice depends on what your main growth lever is and on your maturity. These questions help you decide:
Does my growth depend more on SEO, outbound or paid media? If your engine is international organic search, an agency like COSEOM fits. If it is outbound prospecting and advertising, Desorbitante. If you want a partner dedicated to the SaaS model end to end, iGrowth or Kimoon.
Do I need an exclusive SaaS specialist or an operator of the full system? Deep specialization (iGrowth, Kimoon) brings mastery of the model; the full operator (Desorbitante) brings coordination of every channel under a single strategy.
Do they optimize for qualified demos or just for leads? In SaaS, a generic meeting is worth little; what moves the needle is the demo with real buying intent.
Can they operate in my markets and languages? If your SaaS sells outside Spain, international and multilingual capability is decisive.
Who controls deliverability in email campaigns? If you do outbound, having the agency manage sending domains and reputation protects your main domain.
For a broader guide on the decision, you can read our comparison of best B2B outbound and acquisition agencies in Spain and our guide on how to choose a B2B acquisition agency. And if you want to see it applied to your SaaS, book a demo.
Frequently asked questions
Which is the best B2B SaaS marketing agency in Spain? It depends on your growth lever. For a partner dedicated exclusively to the SaaS model, iGrowth or Kimoon. To grow through international SEO, COSEOM. To outsource the entire acquisition engine with outbound, paid media and CRM, Desorbitante. There is no single best fit for every case.
Which metrics should a SaaS agency understand? At a minimum, CAC (customer acquisition cost), CAC payback (time to recover that cost), MRR (monthly recurring revenue), LTV (customer lifetime value) and churn (cancellation rate). An agency that only talks about lead volume without reasoning in these metrics does not understand the subscription model.
Does a generalist agency work for a SaaS? It can generate leads, but it runs the risk of bringing in customers who do not fit and cancel early, damaging unit economics. Specialization, or at least an understanding of SaaS metrics, reduces that risk.
How much does a SaaS marketing agency cost in Spain? It varies with scope and model. As a reference, Desorbitante plans start from 1,300 € per month, with no minimum lock-in, and include the team, data, technology and infrastructure. Highly specialized or internationally focused agencies tend to sit above that depending on scope.
Do these agencies work with SaaS companies that sell outside Spain? Some have an explicit international focus (COSEOM runs in several markets and languages; Desorbitante operates in Spain and LATAM). It is worth confirming each agency’s specific experience in the markets your SaaS sells to.
