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StackOne

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Accelerate your SaaS growth with our unified API solution for HRIS, ATS, and CRM

London, United KingdomFounded 2023AI
Valuation $50–100M Last recorded · 2025
Headcount <100 Current team size
Total funding $10–50M Disclosed equity funding
Unlock exact values This page shows ranges. Dealroom has the exact numbers for StackOne and the history behind them.

About StackOne

StackOne is a dynamic startup that specializes in providing a unified API (Application Programming Interface) platform designed to simplify and streamline the integration process for businesses. The company operates in the technology and software market, focusing on clients who need to connect various software tools and systems seamlessly. These clients typically include businesses that use multiple software solutions for HR (Human Resources), CRM (Customer Relationship Management), and marketing, among others.

StackOne's business model revolves around offering a single, unified API that allows businesses to integrate different software tools without the usual complexities and security concerns. This unified API supports a wide range of integrations, including popular tools like HaileyHR, BreatheHR, HR Cloud, Pipedrive, and Greenhouse. Recently, they have also introduced a marketing API with initial support for Klaviyo, a marketing automation platform.

The company makes money by charging businesses for access to its API platform. This can be through subscription models, where clients pay a recurring fee to use the service, or through usage-based pricing, where clients are charged based on the number of API calls or the volume of data processed. By providing a reliable and secure integration solution, StackOne helps businesses save time and resources, allowing them to focus on their core activities.

In summary, StackOne is a tech startup that offers a unified API platform to simplify software integrations for businesses, particularly in HR, CRM, and marketing. It operates on a subscription or usage-based revenue model, ensuring secure and efficient connections between various software tools.

Source: Dealroom company data

At a glance

Status
Operational
Founded
2023
Headquarters
London, United Kingdom
Employees
54
Open positions
5
Dealroom signal
79.7/100
Industry
Enterprise Software
Sector
AI, Developer Tools, API, Core AI, B2B Integrations, MLops, AI Model Deployment and Monitoring, AI Agents, uk is8 digital and technologies
Technology
Artificial Intelligence
Business model
SaaS
Client focus
b2b

Funding history

2 recorded events

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
SERIES A✓Equity / VC May 2025 $20M $80M Playfair Capital · Workday Ventures · GV · Episode 1 Ventures ↗
SEED✓Equity / VC Mar 2024 $3.6M $14M Playfair Capital · Sequoia · Charlie Songhurst · Portfolio Ventures ↗
Showing the latest 2 of 2 recorded eventsBook a demo for the full funding history →

Growth signals

StackOne website traffic

Latest recorded traffic for StackOne is 34K monthly website visits, up 41.7% over the last three months. StackOne's team declined 5.3% over the past year.

Latest monthly visits34K 3-month web change+41.7% 1-year team growth-5.3%
Summary metrics are public; monthly history is available with a demoCompare with peers →

Similar companies

Closest operating peers by Dealroom taxonomy

Company identity and context are open; selected comparison metrics preview what is available on the platform.

Showing 8 of the closest matchesCompare every metric →

Investments and acquisitions

Capital deployed

Recent portfolio relationships for companies that also act as investors or acquirers.

Investors

15 investors on the cap table

From Dealroom's funding and investor records, grouped by the round each investor first entered.

Seed5 investors entered at this stage

Series A3 investors entered at this stage

  • GV
  • Workday Ventures
  • XTX Ventures

Other known investors7 additional known investors

  • Edward Lando
  • Grow London
  • Neil Andrew
  • Oliver Molander
  • Richard Hadler
  • Rockman Law
  • Timoteo Rouchon
Team profiled 15 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 3 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Global footprint

Workforce and web traffic by country
Workforce by country
10 countries with
team presence
🇬🇧 United Kingdom68.2%
🇺🇸 United States13.6%
🇫🇷 France2.3%
🇬🇭 Ghana2.3%
🇱🇺 Luxembourg2.3%
Top 5 of 10 shown

Market sentiment

Posts on X, past 7 days

An AI-synthesised read of the highest-engagement posts about StackOne on X, ranked by likes and reposts, corporate channels excluded.

Reading the room on X — pulling top posts and synthesizing themes…

Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

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