SaaS Companies Defined
SaaS companies: quick definition
A SaaS company develops, hosts, and delivers software over the internet on a subscription basis. Customers access the software through a browser — no installation, no on-premise infrastructure, no one-time licence fee.
The defining features: cloud-hosted · subscription pricing (MRR/ARR) · vendor manages all infrastructure and updates · multi-tenant architecture
SaaS in plain English
SaaS stands for Software as a Service. It’s a way of delivering software where the vendor hosts everything in the cloud, and customers access it through a web browser or app on a subscription basis.
Before SaaS, if a business needed accounting software, it would buy a licence (often costing thousands of pounds), receive a CD or download, install it on each computer, manage its own server, and pay for upgrades separately. SaaS flipped this model: instead of buying software, you subscribe to it — the way you might subscribe to Spotify or Netflix. The difference is that SaaS delivers tools you use to do work, not content you consume for entertainment.
The shift sounds simple. The business implications are profound. Recurring subscription revenue, compounding growth, and the economics of customer retention have made SaaS one of the most valuable and widely studied business models of the past two decades.
SaaS vs traditional (on-premise) software
| Factor |
Traditional software (on-premise) |
SaaS |
| Pricing |
One-time licence fee, often large upfront payment |
Monthly or annual subscription; lower entry cost |
| Hosting |
Customer installs and hosts on their own servers or computers |
Vendor hosts in the cloud; customer accesses via browser |
| Updates |
Infrequent major versions; customer manages upgrades |
Continuous deployment; all users always on latest version |
| Customisation |
Often highly customisable at installation |
Configuration within defined parameters; less deep customisation |
| Security & compliance |
Customer manages own security infrastructure |
Vendor responsible; typically SOC 2, ISO 27001, GDPR compliance |
| Scalability |
Requires additional hardware procurement to scale |
Scales instantly; infrastructure cost is vendor’s problem |
| Revenue model (vendor) |
Lumpy, transactional; hard to predict |
Recurring, predictable; ARR compounds with retention |
| Typical exit multiple (vendor) |
1–3× revenue in M&A |
5–15× ARR for growth-stage; 20–30× for high-growth public SaaS |
How the SaaS business model works
The SaaS business model is built on recurring subscription revenue. This sounds straightforward but it creates a completely different economic logic compared to any business that earns revenue once per sale.
The subscription flywheel
In a traditional business, every sale is a fresh transaction. In SaaS, every customer you acquire keeps paying — month after month, year after year — unless they cancel. This means:
- Revenue is predictable: You can forecast next month’s revenue with high accuracy from your current subscriber base. This is what makes SaaS companies highly attractive to investors — revenue visibility that most businesses can’t match.
- Growth compounds: Each new customer added this month joins the base that generates revenue in all future months. Even moderate growth rates build into substantial ARR over time.
- Retention is everything: A customer who churns takes all their future subscription payments with them. A 5% monthly churn rate means you’re replacing your entire customer base roughly every 20 months — an enormous treadmill. A 1% monthly churn rate means the base compounds powerfully.
- Expansion revenue supercharges growth: The best SaaS companies earn more revenue from existing customers over time — through upsells, additional seats, or expanded plans. When expansion revenue exceeds churn, you achieve negative net revenue churn — the base grows even if you acquire zero new customers.
Why SaaS companies lose money before they make it
A common confusion: many successful SaaS companies report significant losses. Stripe, Slack, HubSpot, and Salesforce all ran at losses for extended periods. This is structurally intentional, not a sign of failure.
The logic: if your Customer Acquisition Cost (CAC) is £3,000 and a customer pays you £200/month with 2% monthly churn, that customer is worth approximately £10,000 in lifetime revenue (a 3.3× return). The payback period is 15 months. If you can raise capital and deploy it to acquire customers at that unit economics ratio, growing fast and losing money is rational — you’re converting cash into future revenue streams.
This is why investors evaluate SaaS companies primarily on ARR growth rate, NRR, and the CAC:LTV ratio rather than near-term profitability — and why a company losing money can still be considered highly successful and command a high valuation multiple.
Types of SaaS companies
Not all SaaS companies are the same. The most useful taxonomies for understanding the space:
By customer type: B2B vs B2C SaaS
| Dimension |
B2B SaaS |
B2C SaaS |
| Customer |
Businesses and teams |
Individual consumers |
| ACV (annual contract value) |
£1,000–£1,000,000+ per customer |
£5–£200 per customer |
| Churn dynamics |
Lower churn; switching costs are high |
Higher churn; consumers switch easily |
| Sales motion |
Sales team, demos, procurement process |
Self-serve, paid acquisition, viral growth |
| Unit economics |
High CAC, high LTV, long payback periods |
Low CAC (or free/viral), lower LTV, short payback |
| UK examples |
HubSpot, Salesforce, Juro, Paddle, Attest |
Duolingo, Headspace, Calm, Spotify (borderline) |
By market scope: horizontal vs vertical SaaS
| Type |
Definition |
Examples |
Trade-offs |
| Horizontal SaaS |
Serves any industry; solves a universal business problem |
Slack (comms), HubSpot (CRM), Xero (accounting), Notion (docs) |
Huge TAM; intense competition; harder to differentiate |
| Vertical SaaS |
Built specifically for one industry’s workflows |
Phorest (salons), Veeva (pharma), Procore (construction), Clio (legal) |
Smaller TAM; lower competition; deep customer fit; higher retention and NPS |
Vertical SaaS has become increasingly attractive to founders and investors. By deeply embedding into one industry’s specific workflows — terminology, compliance needs, integrations, and data structures — vertical SaaS companies achieve the kind of product-market fit that horizontal companies can’t match in a given sector. This translates to higher retention, lower CAC, and stronger pricing power.
By go-to-market motion: PLG vs sales-led vs hybrid
| Motion |
How customers are acquired |
Examples |
When it works best |
| Product-Led Growth (PLG) |
Product itself drives acquisition — free tier, viral loops, self-serve upgrade |
Slack, Notion, Calendly, Figma, Dropbox |
When the product has immediate individual value; lower ACV; bottoms-up enterprise adoption |
| Sales-led |
SDRs, AEs, and enterprise sales drive new business |
Salesforce, Workday, ServiceNow, SAP |
Complex products; high ACV; long buying cycles; procurement-heavy customers |
| Hybrid (PLG + Sales) |
Product drives initial adoption; sales converts and expands |
HubSpot, Atlassian, Zoom, GitLab |
When individual users adopt via self-serve but enterprise contracts require human sales involvement |
By customer segment: SMB, mid-market, and enterprise SaaS
SaaS companies typically specialise in a customer segment, as the product design, pricing, sales process, and support model required are dramatically different:
- SMB SaaS: Serves small businesses (under ~50 employees). Low ACV (£500–£5,000/year), high volume, self-serve or transactional sales, very high churn sensitivity. Examples: FreeAgent, Xero for small business, Calendly.
- Mid-market SaaS: Serves companies of 50–500 employees. ACV £5,000–£50,000/year. Requires a sales team but shorter cycles than enterprise. The sweet spot for many UK SaaS scale-ups.
- Enterprise SaaS: Serves large organisations (500+ employees). ACV £50,000–£1M+/year. Long sales cycles (6–18 months), procurement involvement, security reviews, custom contracts. High switching costs once embedded.
SaaS vs PaaS vs IaaS: the cloud computing stack
SaaS is one of three main cloud service models. Understanding how they relate helps clarify what a SaaS company actually is — and isn’t.
| Model |
What it delivers |
Who uses it |
Examples |
| IaaS
Infrastructure as a Service |
Raw computing infrastructure: servers, storage, networking, virtualisation |
IT teams building their own environments; companies migrating from on-premise data centres |
AWS EC2, Google Compute Engine, Microsoft Azure VMs, DigitalOcean |
| PaaS
Platform as a Service |
A development platform with tools, runtime environments, databases, and deployment infrastructure — so developers can build apps without managing servers |
Software developers building applications |
Heroku, AWS Lambda, Google App Engine, Vercel, Render, OpenAI API |
| SaaS
Software as a Service |
Finished, ready-to-use applications delivered through a browser on a subscription basis |
End users — employees, teams, businesses — to do their day-to-day work |
Salesforce, Slack, HubSpot, Xero, Juro, Wise Business |
A useful analogy: IaaS is like renting land and building materials. PaaS is like renting a fitted workshop with all the tools. SaaS is like renting the finished product the workshop produces. Most SaaS companies are themselves built on IaaS or PaaS infrastructure — Slack runs on AWS; Figma used Google Cloud. The SaaS layer is the finished application, regardless of what infrastructure sits beneath it.
SaaS examples: global and UK-founded
Well-known global SaaS companies
| Company |
What it does |
B2B or B2C |
GTM motion |
| Salesforce |
CRM platform |
B2B |
Sales-led |
| HubSpot |
Marketing, sales, and CRM platform |
B2B |
Hybrid (PLG + sales) |
| Slack |
Team messaging and collaboration |
B2B |
PLG → Enterprise sales |
| Zoom |
Video conferencing |
B2B + B2C |
PLG |
| Notion |
Docs, wikis, and project management |
B2B + B2C |
PLG |
| Xero |
Cloud accounting for SMBs |
B2B (SMB) |
Partner-led + self-serve |
| Figma |
Collaborative design platform |
B2B |
PLG → Enterprise |
| Shopify |
E-commerce platform |
B2B (SMB + enterprise) |
Self-serve + partner |
UK-founded SaaS companies
The UK has produced a significant number of SaaS companies, many of which are globally recognised or have become valuable businesses without relocating to the US. A cross-section:
| Company |
Category |
Founded |
Notable |
| Wise |
International payments / fintech SaaS |
2011 |
Listed on LSE 2021; one of UK’s most successful fintech IPOs |
| Paddle |
Payments infrastructure for SaaS |
2012 |
Raised $200M Series D; handles payments and tax compliance for SaaS globally |
| Juro |
Contract management SaaS (legal) |
2016 |
Vertical SaaS for legal teams; backed by Union Square Ventures |
| Thought Machine |
Core banking SaaS |
2014 |
Valued at $2.7B; helps banks replace legacy core banking systems |
| Attest |
Consumer research SaaS |
2015 |
Raised $60M Series B; used by brands for market research at speed |
| Phorest |
Vertical SaaS for salons and spas |
2003 |
One of the earliest UK-adjacent vertical SaaS companies; thousands of salon customers |
| Cleo |
AI financial assistant (B2C SaaS) |
2016 |
$140M+ raised; B2C fintech SaaS for personal budgeting |
| Modulr |
Payments-as-a-service (PaaS/SaaS hybrid) |
2016 |
Unicorn; embeds payment infrastructure into other platforms |
| Onfido |
Identity verification SaaS |
2012 |
Acquired by Entrust in 2024 for $650M; AI-powered document and biometric verification |
Common misconceptions: is Netflix SaaS? Is ChatGPT SaaS?
Several popular services are frequently misclassified as SaaS. Getting these right matters — the model has meaningful implications for how a business works, how it’s valued, and what it’s like to work there.
Is Netflix SaaS?
No — Netflix is a streaming media service, not SaaS. While Netflix shares surface characteristics with SaaS (subscription-based, cloud-delivered, no installation), the critical distinction is what is being delivered. SaaS delivers software tools that customers use to accomplish tasks — communicate, manage data, write contracts, run campaigns. Netflix delivers content (films and television) for consumption. There’s no task being done; there’s no tool being used. Netflix is more precisely described as a direct-to-consumer streaming service, or in some frameworks, a form of DaaS (Data as a Service) where the data is media content.
Is ChatGPT SaaS?
Yes — ChatGPT in its commercial form is SaaS. ChatGPT Plus, Team, and Enterprise are subscription-based software products delivered through a web interface, hosted by OpenAI. Users subscribe to access AI capabilities without installing anything locally. This fits the SaaS definition precisely.
The OpenAI API, however, is better classified as PaaS — it provides a platform and capability for developers to build their own applications, rather than a finished product for end users. This distinction matters: many companies that “build on ChatGPT” via the API are themselves building SaaS products, but they are the SaaS layer — OpenAI’s API is the platform underneath them.
Is Spotify SaaS?
Borderline — and the debate is genuinely interesting. Spotify delivers software (a music streaming application) that users interact with to perform a task (listen to music, create playlists, discover artists). Unlike Netflix, Spotify has features — playlist creation, recommendations, podcasts, social sharing — that make it behave more like a tool than a pure content channel. Most analysts classify Spotify as a streaming media service with SaaS characteristics rather than a pure SaaS company. For practical purposes, it doesn’t matter much — Spotify’s business model, unit economics, and culture differ materially from B2B SaaS regardless of classification.
Is Shopify SaaS?
Yes — Shopify is a clear SaaS company. Merchants subscribe to use Shopify’s e-commerce platform, hosted in the cloud, to run their online stores. Shopify also earns transaction fees and payment processing revenue, making it a hybrid SaaS + payments company — but its core is SaaS.
Is Monzo SaaS?
No — Monzo is a bank (a licensed fintech), not a SaaS company. While Monzo uses cloud infrastructure and has a subscription premium tier (Monzo Plus, Monzo Premium), it is fundamentally a financial services company regulated by the FCA and PRA as a bank. It holds customer deposits, provides credit, and operates payments infrastructure. Monzo for Business has SaaS-like characteristics (subscription access to banking features), but Monzo itself is not a SaaS company. Paddle, by contrast, is SaaS — it sells software that handles payments and tax compliance for other SaaS companies.
Key SaaS metrics every professional should understand
Working at or evaluating a SaaS company means encountering these terms constantly. Here’s each one defined and contextualised:
| Metric |
Full name |
What it measures |
Healthy benchmark |
| MRR |
Monthly Recurring Revenue |
Total predictable subscription revenue per month |
Growing month-over-month; tracked via new MRR, expansion MRR, churned MRR |
| ARR |
Annual Recurring Revenue |
MRR × 12; the annualised run rate of recurring revenue |
Primary metric for SaaS company size and valuation; Series A SaaS: £1–5M ARR; Series B: £5–20M ARR |
| Churn rate |
Customer or revenue churn |
% of customers or revenue lost in a period |
SMB: <5% monthly; B2B mid-market: <2% monthly; Enterprise: <1% monthly |
| NRR / NDR |
Net Revenue Retention / Net Dollar Retention |
% of revenue retained from existing customers after churn and expansion |
Good: >100%; excellent: >120%; best-in-class: >130% (Snowflake, Twilio peak) |
| CAC |
Customer Acquisition Cost |
Total sales and marketing spend ÷ new customers acquired in the same period |
CAC payback period <12 months is good; <18 months is acceptable for enterprise |
| LTV |
Customer Lifetime Value |
Average revenue a customer generates over their entire relationship with the company |
LTV:CAC ratio of 3:1 or above; 5:1+ is strong |
| Rule of 40 |
— |
Revenue growth rate (%) + EBITDA margin (%) should ≥ 40% |
Passing Rule of 40 signals healthy balance of growth and efficiency; most applicable at Series B+ |
| Gross margin |
— |
(Revenue – Cost of Revenue) ÷ Revenue. Reflects the economics of delivering the software. |
Healthy SaaS: 70–80%+ gross margin; enterprise software often 75–85% |
| 3-3-2-2-2 |
Bessemer growth benchmark |
Ideal ARR growth trajectory: 3×, 3×, 2×, 2×, 2× over five years from initial scale |
A company at $1M ARR following this path reaches ~$70M ARR in year 5; aspirational rather than universal |
SaaS company funding stages: what they mean in practice
SaaS companies follow a broadly consistent funding journey. Understanding the stages helps you evaluate the risk, pace, and opportunity of a particular employer or investment:
| Stage |
Typical ARR |
Round size (UK) |
What the company looks like |
Primary focus |
| Pre-seed / Seed |
£0–£1M ARR |
£500K–£3M |
2–15 people; founder-led sales; product being built or early validation |
Product-market fit; first 10–50 paying customers |
| Series A |
£1M–£5M ARR |
£3M–£15M |
15–50 people; first sales team being built; repeatable go-to-market being established |
Go-to-market repeatability; hiring engine |
| Series B |
£5M–£20M ARR |
£10M–£50M |
50–200 people; scaling sales, marketing, CS; product expanding; international expansion possible |
Scaling efficiently; reducing CAC payback; NRR |
| Series C+ |
£20M–£100M ARR |
£30M–£150M+ |
200–1,000 people; structured departments; international operations; IPO or acquisition being considered |
Path to profitability; market leadership; M&A |
| Public / Listed |
£100M+ ARR |
Public equity markets |
1,000+ people; public quarterly reporting; Rule of 40 scrutiny; institutional shareholders |
Growth + profitability balance; shareholder returns |
What it’s actually like to work at a SaaS company
As a SaaS recruitment firm, we place hundreds of people into UK SaaS companies every year — across engineering, product, sales, marketing, customer success, and data roles. Here’s what the experience genuinely looks like, beyond the perks slide in the job description:
The pace is real
SaaS companies — especially from Seed to Series B — move faster than most traditional businesses. Strategies change as data comes in. Priorities shift when a large customer churns or a competitor launches a new feature. This is energising for people who like high-agency, high-velocity environments. It’s uncomfortable for people who prefer stability and clear process. Neither is wrong — but be honest about which you are before joining a 30-person Series A company.
Equity matters — if you understand it
Most UK SaaS companies offer equity (options or shares) as part of the compensation package. This can be worth nothing or it can be transformational — it depends entirely on the outcome of the business. Key things to understand before accepting equity: the vesting schedule (usually 4 years with a 1-year cliff), the strike price relative to current valuation, the option type (EMI options have more favourable tax treatment in the UK), and whether the company has a clear path to liquidity (IPO, acquisition, or secondary sale).
EMI (Enterprise Management Incentive) options are the standard equity vehicle for UK SaaS companies. If a company offers growth shares, RSUs, or unapproved options instead of EMI, understand why — it may be a structural or eligibility issue, or it may simply be a different compensation philosophy.
Career growth is genuinely faster — in the right company
In a SaaS company growing from 20 to 200 people over three years, early employees who grow with the business frequently advance multiple levels faster than they would in a larger, slower-moving organisation. An SDR who joins at Series A and performs well can become a team lead by Series B. A product manager who joins early can grow into a Head of Product role much faster than in a FTSE 100 software division. The flip side: if the company doesn’t grow, there’s limited headroom.
Metrics-driven culture
SaaS companies are intensely data-driven. Sales targets, pipeline metrics, content performance, product adoption, customer health scores — almost everything is measured. This is good if you’re comfortable with performance accountability and like clarity on whether you’re winning. It can feel relentless if you prefer qualitative assessment of your contribution. Revenue-generating roles (sales, marketing) tend to have especially clear quantitative accountability.
Customer success is a first-class function
In traditional software companies, support is a cost centre. In SaaS, Customer Success is a revenue-generating function — NRR depends on it. Well-run SaaS companies invest heavily in CS, and CS roles carry real commercial accountability (retention quotas, expansion targets). If you’re interested in a customer-facing technical role with commercial weight, SaaS CS is one of the most interesting environments to work in.
The UK SaaS ecosystem in 2026
The UK has the largest SaaS ecosystem in Europe, with London consistently ranking as a top-three global hub for SaaS investment alongside San Francisco and New York. Key characteristics of the UK SaaS market:
- Fintech and regtech are outsized: The UK’s financial services heritage and FCA regulatory environment have produced a disproportionate concentration of fintech and regulatory SaaS companies — Wise, Thought Machine, Modulr, Onfido, Behavox, and dozens of others.
- Strong B2B SaaS cluster: London in particular has a mature B2B SaaS scene — HubSpot, Salesforce, and Workday all have significant UK offices; UK-founded B2B SaaS companies include Juro, Attest, Paddle, and Plandek.
- Outside London: Manchester, Bristol, Edinburgh, and Leeds all have growing SaaS scenes. Manchester has particular strength in HR tech and customer service SaaS. Bristol has produced several notable data and analytics SaaS companies.
- Talent pipeline: UK universities produce strong technical and commercial graduates. The UK SaaS talent pool is increasingly deep, though specialist roles (senior data engineers, ML engineers, experienced enterprise AEs) remain competitive.
- Funding environment (2026): After the correction of 2022–2023, the UK SaaS funding market has stabilised. Seed and Series A continue at a healthy pace; Series B and C require stronger metrics than during the 2020–2021 peak. Investors are applying more scrutiny to Rule of 40 and path-to-profitability than they were three years ago.
Frequently asked questions
What are considered SaaS companies?
A SaaS company hosts software in the cloud and delivers it to customers via subscription over the internet. The defining features are cloud-hosted delivery, subscription pricing, and the vendor managing all infrastructure and updates. Examples include Salesforce, HubSpot, Slack, Zoom, Xero, and UK-founded companies such as Wise, Paddle, Juro, Thought Machine, and Attest.
What does it mean to be a SaaS company?
Being a SaaS company means delivering software as a recurring subscription service rather than a one-time licence. This creates predictable, recurring revenue (measured as MRR or ARR), makes customer retention the primary growth driver, and means the company is valued on ARR multiples rather than traditional earnings. SaaS companies invest heavily upfront in product and go-to-market, then benefit from compounding recurring revenue as they retain and expand the customer base.
Is ChatGPT considered SaaS?
Yes — ChatGPT in its commercial form (Plus, Team, Enterprise) is SaaS: subscription-based, cloud-delivered, accessed through a browser, with OpenAI managing all infrastructure. The OpenAI API is more accurately PaaS — it provides a development platform for others to build their own SaaS applications on top of.
Is Netflix a SaaS?
No. Netflix is a streaming media service. While it’s subscription-based and cloud-delivered, it delivers content for consumption rather than software tools for doing work. SaaS specifically refers to software applications. Netflix is more accurately a direct-to-consumer streaming service.
What is the Rule of 40 for a SaaS company?
The Rule of 40 states that a healthy SaaS company’s revenue growth rate (%) plus EBITDA margin (%) should equal or exceed 40%. It balances growth and profitability in a single benchmark — recognising that fast-growing companies can run at a loss, provided the growth rate compensates. Most applicable at Series B and beyond.
What is the difference between SaaS, PaaS and IaaS?
IaaS (Infrastructure as a Service) provides raw computing infrastructure — servers, storage, networking. PaaS (Platform as a Service) provides a development platform for building applications. SaaS (Software as a Service) provides finished applications accessed by end users. Think of it as a stack: IaaS is the foundation, PaaS is the workshop on top of it, and SaaS is the finished product the workshop produces.
What is the 3-3-2-2-2 rule of SaaS?
The 3-3-2-2-2 rule is a growth benchmark from Bessemer Venture Partners suggesting a SaaS company should aim to triple ARR in years one and two, then double in years three, four, and five. Starting from £1M ARR, this path reaches approximately £70M ARR in five years. It’s an aspirational benchmark for high-growth VC-backed SaaS, not a universal expectation.
Building a team at a UK SaaS company?
Live Digital specialises in placing engineers, product managers, data professionals, sales, marketing, and CS hires into UK SaaS companies from Seed to Series C+. Whether you’re making your first hire or scaling a team, we can help.
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