Two former NetSuite engineers spent a decade turning the least glamorous job in software - getting one app to speak to another - into a business ranked the #1 iPaaS and worth an estimated half a billion dollars.
Somewhere right now, an order placed on a Shopify store is quietly appearing inside an accounting system, a warehouse system, and a shipping label - all within seconds, without a single person retyping it. That handoff, invisible and unglamorous, is the entire business of Celigo. The company makes integrator.io, an integration platform as a service, or iPaaS: software whose only job is to get other software to cooperate.
It is not a category most people can name, let alone spell. But it sits underneath a surprising amount of modern commerce. Celigo connects more than 200 applications - NetSuite, Salesforce, Shopify, Amazon, BigCommerce, Snowflake and hundreds of long-tail business tools - and moves data between them so that finance, operations and ecommerce teams do not spend their days copying rows from one screen into another. More than 4,000 companies pay for it, among them PayPal, Toshiba, Verizon, Michelin and Gibson.
The founders came from the problem
Celigo was founded in 2011 by Jan Arendtsz and Scott Henderson, both refugees from NetSuite, the cloud ERP that pioneered running a company's financials in a browser. Arendtsz, now CEO, had been a director there and helped launch NetSuite's own integration platform. That detail matters. The founders did not stumble onto integration as a market opportunity - they lived inside it, watching customers struggle to wire NetSuite into everything else they ran.
So the first version of Celigo was narrow and deliberate: be the best possible way to connect NetSuite to the rest of a business. In 2016 the company turned that expertise into a general platform, integrator.io, and began collecting the funding to scale it. The beachhead strategy - own one platform completely, then expand outward - is a large part of why NetSuite-heavy companies still reach for Celigo first.
What you actually do with it
Strip away the jargon and Celigo does three things. It integrates - keeping data in sync so a customer record, a product, or an inventory count is the same everywhere it lives. It automates - running end-to-end processes like order-to-cash, procure-to-pay and quote-to-cash without human hand-offs. And it optimizes - catching the errors that inevitably appear when systems disagree, and increasingly fixing them on their own.
The company sells much of this as prebuilt integration apps and templates: reusable building blocks so a mid-market team can stand up a working NetSuite-to-Shopify connection in days rather than building bespoke code for months. That packaging is the difference between an iPaaS that only a developer can love and one a revenue-operations manager can actually deploy.
The problems it removes are the ones that quietly tax a growing company. A finance team closing the books should not be reconciling numbers that three systems report differently. A customer-support agent should not be toggling between an ecommerce platform and an ERP to answer a where-is-my-order question. A warehouse should not learn about a sale hours after it happened. Each of those gaps is a place where a person becomes the integration - manually shuttling data - and every one of them is a place Celigo is designed to close. The platform also leans on error management: when two systems disagree, it flags the failure, explains the likely cause, and increasingly resolves it without a ticket.
Who's on the other end
Celigo's sweet spot is the mid-market and lower enterprise - companies large enough to run a real stack of specialized software, but without the platoon of integration engineers a Fortune 100 can throw at the problem. That includes ecommerce and direct-to-consumer brands, distributors and 3PLs, subscription and SaaS businesses, and the finance and operations teams inside them. The named logos skew recognizable - PayPal, Toshiba, Verizon, Michelin, Gibson - but the more telling fact is the breadth: 4,000-plus customers is less a handful of marquee accounts than a long tail of companies that all hit the same wall as they scaled and reached for the same fix.
A slice of Celigo's connector catalog. The highlighted tiles are among its most-used endpoints.
The busiest day nobody sees
Integration is the kind of infrastructure you only notice when it breaks. Celigo's own proof point is the shopping calendar: during the 2025 holiday peak, the platform processed more than 15 million transactions as retailers pushed orders through their stacks at full tilt. None of those buyers knew Celigo existed. That is the correct outcome. The measure of good plumbing is that no one thinks about it.
The $48M Series C was led by NewSpring Capital with OMERS Growth Equity, at a roughly $566M post-money valuation.
How it makes money
Celigo is a subscription business. Customers pay tiered annual fees for the platform, sized by the endpoints and flows they run rather than metered per task - a distinction the company leans on hard, because task-based pricing at rivals can make scaling feel like a penalty. Revenue also comes from prebuilt integration apps and from professional and managed services, sold both directly and through a network of system integrators and solution partners. Independent estimates put annual revenue around $92 million.
Where it sits against the field
The iPaaS market is crowded and the names blur together, so the useful question is who each platform is really for. MuleSoft, owned by Salesforce, is the enterprise heavyweight built for large teams doing API-led integration at scale - and priced accordingly. Boomi is one of the oldest players, historically aimed at technical integration teams. Workato is loved by business users for its recipe-style builder but can get expensive on high volume. Celigo's position is the pragmatic middle: strong in NetSuite and ecommerce, packaged for mid-market teams, with pricing meant to stay predictable as you grow.
| Platform | Best for | Reputation |
|---|---|---|
| Celigo | NetSuite + ecommerce mid-market | Prebuilt apps, predictable pricing |
| MuleSoft | Large Salesforce enterprises | API-led, developer-heavy, costly |
| Boomi | Technical integration teams | Veteran, broad, on-prem + cloud |
| Workato | Business-user automation | Recipes, pricey at high volume |
The turn toward agents
The most interesting thing about Celigo in 2026 is that the plumbing is learning to think. In March the company launched Celigo Ora, a natural-language copilot with a multi-agent architecture: describe the automation you need in a sentence, and specialized agents interpret the business context, design the flow, and troubleshoot errors. Alongside it came Agent Builder, a low-code environment for automations that can reason through a task and act across systems, and an MCP server - an implementation of the Model Context Protocol - for secure, real-time AI connectivity into enterprise data.
The pitch is aimed squarely at what Celigo calls the specialist bottleneck: the reality that building and maintaining integrations has always required scarce experts. If an operations lead can describe an automation and have it built and governed for them, the addressable audience widens well beyond the integration team. Whether that promise fully lands is still being tested in the market - but the strategic logic is clear, and it lines up with the company's June 2026 read that unified-commerce firms are building the automation backbone for AI.
There is also a quieter logic to why an integration company is well placed for the agent era. AI agents are only as useful as their access to real, current business data, and that access is exactly what an iPaaS has spent years brokering. Celigo's argument is that the same platform can run the full spectrum of automation on one governed surface - from rigid, rules-based flows that must never deviate, to adaptive agents that decide as they go - rather than forcing companies to bolt a separate AI stack onto their operations. The connectors that once just moved rows become the hands and eyes an agent needs to act.
Quietly decorated
For a company in a category most people cannot name, Celigo has collected a wall of the awards that matter to buyers: ranked the #1 iPaaS on G2 for eight consecutive quarters, named a Visionary in the 2026 Gartner Magic Quadrant for iPaaS, and the only vendor cited as a 2025 Gartner Peer Insights Customers' Choice in its category. It has also been a USA Today Top Workplace from 2024 through 2026, running a values framework it formalized in 2020, from offices in Redwood City, Amsterdam, Sydney, Hyderabad, Bristol and Frankfurt.
None of it is the stuff of magazine covers. But integration rarely is. Celigo's bet, made by two engineers who had seen the problem from the inside, was that the unglamorous middle of the software stack - the part that makes everything else work together - would be a durable place to build a business. Fourteen years, 4,000 customers and an AI pivot later, the bet is still holding.