The archive · Developer & Business Tools · Product decision · 2017–2022
Retool raises $45M at $3.2B betting developers will assemble custom apps
Founded 2017, Retool sells drag-and-drop building blocks for internal apps; by its 2022-07-28 $45M Series C2 at $3.2B, 500,000+ apps had been built on it.
Retool
What the business is
Retool is a San Francisco software company whose platform lets engineers build internal apps such as forms, tables, charts and admin tools by dragging together roughly 90 prebuilt components, adding code on top, and connecting any REST/GraphQL API or data store like PostgreSQL and MongoDB.
How it started
Retool was founded in San Francisco in 2017. CEO David Hsu's core thesis was that software construction had not changed in 20 or 30 years — developers still typed everything from scratch using specialized knowledge. Retool's answer was drag-and-drop interfaces for the major components, with code written on top only for the last 20–30% of the work, to make bespoke software flexible, customized, faster to build and easier to maintain; he said a typical two weeks of development could be whittled down to one day.
What happened
Retool deliberately focused on internal apps, which Hsu called a strategic choice because they represent more than half of all software and are exactly the apps that may need private-cloud or on-premise deployment across legacy and modern systems. By July 2022 the platform counted more than 500,000 apps built and billions of queries, with customers such as Amazon, Pinterest, Coursera, the NFL and NBCUniversal. On 2022-07-28 Retool announced a $45 million Series C2 at a $3.2 billion valuation, with previous investors including Sequoia Capital, Stripe co-founders John and Patrick Collison, GitHub's former CEO Nat Friedman, Elad Gil, Daniel Gross and Caryn Marooney — a step up from a $20 million Series C at $1.85 billion in December 2021 — and said the money would fund deeper functionality, hiring and geographic expansion beyond San Francisco.
How it ended up
Retool is still operating: the homepage fetched on 2026-09-05 sells the same internal-apps builder to enterprises, now marketing AI-assisted app generation, MCP server integration and built-in governance, so the internal-apps wedge became the platform's core rather than a detour.
Background
Retool was founded in San Francisco in 2017 on David Hsu's thesis that the way software is built has not changed in decades: developers type nearly everything from scratch using specialized knowledge. His alternative was drag-and-drop assembly of major components — forms, tables, charts — with code written only for the last 20–30% of the work, connecting to whatever database or API the customer already has.
The company aimed deliberately at internal apps, which Hsu estimated at more than half of all software and which often need to run on private cloud or on-premise infrastructure across legacy and modern systems. By the time of its July 2022 raise, TechCrunch reported more than 500,000 apps built on Retool with billions of queries, and named Amazon, Pinterest, Coursera, the NFL and NBCUniversal among customers.
On 2022-07-28 Retool announced a $45 million Series C2 at a $3.2 billion valuation, backed again by Sequoia Capital, Stripe co-founders John and Patrick Collison, Nat Friedman, Elad Gil, Daniel Gross and Caryn Marooney, up from a $20 million Series C at $1.85 billion in December 2021. Hsu's claim was that building and maintaining custom software becomes dramatically cheaper: two weeks of typical development can shrink to one day.
The homepage fetched on 2026-09-05 shows Retool still selling the same internal-apps platform to enterprises, now adding AI-assisted app generation, an MCP server and built-in governance and security — evidence that the internal-tools bet became the company's core rather than a stepping stone.
What has to be true
- The wedge was structural: internal apps are more than half of all software, off-the-shelf products cannot cover them, and hand-built code is slow, so a faster assembly layer had a real market.
- The product met developers where they were: drag-and-drop for the repetitive 70–80% plus code for the hard 20–30% meant engineers kept control instead of being replaced by a no-code tool.
- Retool connected to customers' existing databases and APIs rather than forcing ETL into a managed store, removing a migration cost that would have blocked adoption.
- Named, dated traction preceded the valuation: TechCrunch reported 500,000+ apps built and billions of queries, with big-name customers, before the July 2022 raise.
- The funding round was deliberately incremental — $45M from existing backers months after the $20M Series C — so the company raised on demonstrated usage rather than a new story.
What can be applied
Retool won by targeting internal tools, where off-the-shelf products cannot fit and bespoke code is slow, and making developers faster rather than replacing them.
Aftermath
As of 2026-09-05 Retool continues to operate and its homepage markets the platform to enterprises as a governed way to build internal software, adding AI-assisted app generation from natural language or an AI coding agent, an MCP server, and auth, access controls and audit logging built in. The 2022 material documents Retool's state at the time of the raise: more than 500,000 apps built, billions of queries, customers including Amazon, Pinterest, Coursera, the NFL and NBCUniversal, and plans to hire, deepen functionality and expand geographically from San Francisco.
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