Retool
Build internal tools, remarkably fast
TL;DR: Build internal tools, remarkably fast. Reached $11,550,000 MRR with 500000+ users.
Key Metrics
As of 2025-10
Milestones
Pricing
Tech Stack
Sources
Timeline
2017-01
David Hsu running Cashew (UK Venmo competitor) at YC W17, burning $1,000/day with less than 60 days of runway
2017-04
Pivoted from Cashew to Retool after recognizing internal tools built for fraud/KYC represented a larger opportunity
2017-04
Built functional prototype within days, repurposing code from Cashew's internal tool infrastructure
2017-05
First cold outbound attempts: targeted FileMaker users on LinkedIn, yielded sub-2% response, all negative
2017-05
Pivoted ICP from FileMaker users to React/JavaScript developers building internal frontends
2017-06
Cold email to Rappi CTO got response within 15 minutes, validating new messaging
2017-06
First customer signed: YC batch company Brex among earliest customers
2017-06
First customer needed API integration - team built the feature overnight
2017-07
YC Demo Day: announced $1.5M enterprise pilot and $11K MRR
2017-08
Seed round: $150K from Y Combinator, plus investment from Elad Gil, Nat Friedman, Collison brothers, Joe Montana
2017-09
Began systematic outbound: Crunchbase Pro for 10,000 target companies, Upwork for 40,000 contact enrichment
2017-12
Built 'Big Fish Swimming' Slack tool - real-time alerts when large account users access Retool
2018-01
Built 'Big Fish Errors' - analytics-driven error detection with instant team notification for trial users
2018-02
Established shared Slack channels with major customers like DoorDash for proactive support
2018-03
Reached approximately $500K ARR through pure outbound, ~20-30 customers averaging $20K+/year
2018-06
Approaching $1M ARR before making a single hire outside founding team
2018-08
Launched on Hacker News with revised messaging ('internal tools', 'low code'). Business immediately shifted to inbound.
2020-07
Hired Devon Groff as first associate sales engineer to handle inbound volume
2019-10
Series A led by Sequoia Capital (Bryan Schreier)
2020-10
Series B: $50M raised, largest funding round
2020-12
Reached approximately $10M ARR
2021-12
Became a unicorn (valuation exceeded $1B)
2021-06
Launched free tier with unlimited apps, capped at 5 users
2022-06
Reached approximately $80M ARR
2022-07
Series C: $45M at $3.2B valuation, backed by Sequoia and notable tech founders
2023-01
Team size approximately 450-470 employees
2023-06
Notable customers include DoorDash, Amazon, Mercedes-Benz, Disney, Airbnb, NBC
2023-12
Annual revenue reached $93.5M
2024-06
Over 500,000 apps built on platform
2024-12
Annual revenue reached $138.6M, approximately $90M ARR
2025-04
Launched AppGen - AI-powered app generation feature, introduced AI prompting credits monetization
2025-05
Launched Agents feature - AI agents with agent hours as new monetization unit
2025-10
Reached $120M ARR, up 33% year-over-year
Distribution
Cold Outbound
Systematic cold email campaign: identified 10,000 mid-stage startups via Crunchbase Pro, enriched 40,000 contacts using Upwork freelancers, deployed PersistIQ for automated sequences with extensive A/B testing on subject lines and messaging
→ 8% response rate, ~2,400 interested leads, $500K ARR in 9 months as sole distribution channel
Hacker News
Posted with revised messaging emphasizing 'internal tools' and 'low code' after earlier attempt with technical jargon ('Excel with higher-order primitives') failed completely
→ Immediately shifted business to inbound, 5-20 company signups daily, reached $2M ARR with 40 customers at that point
YC Network
Sold to fellow YC batch companies during W17 accelerator including Brex as early customer
→ $11K MRR and $1.5M enterprise pilot secured before Demo Day, plus seed investment from notable angels
Self-serve/Freemium
Launched free tier with unlimited apps but capped at 5 users to drive adoption, betting on enterprise conversion
→ 80% of customers eventually originated through self-serve channel
Launches
$1.5M enterprise pilot, $11K MRR, seed investment from notable angels
Shifted business from outbound to inbound, 5-20 company signups daily
Growth Story
Retool was born from a failing UK fintech (Cashew) when founder David Hsu realized the internal tools he built for fraud detection and KYC compliance represented a massive underserved market. Pivoting 60 days before YC Demo Day, Hsu built a prototype that enabled developers to assemble internal tools from drag-and-drop components. He reached $500K ARR through systematic cold outbound (10,000 target companies, 40,000 contacts enriched via Upwork, PersistIQ email automation) before a successful Hacker News launch in August 2018 with revised messaging shifted the business to inbound, reaching $2M ARR with 40 customers. The company grew to $138.6M revenue by 2024, backed by Sequoia Capital at a $3.2B valuation.
Key Insights
- →Pivoted from a failing fintech startup by recognizing that the internal tools built for compliance represented a larger opportunity than the fintech itself - leftover code became the foundation of a billion-dollar product
- →Used systematic cold outbound for 18 months: Crunchbase Pro for targeting, Upwork freelancers for contact enrichment at $4,000 for 40,000 records, and PersistIQ for email automation achieving 8% response rate
- →Finding language-market fit was more important than product changes - same product with different messaging went from zero traction to instant responses (Rappi CTO replied in 15 minutes)
- →Built internal monitoring tools (Big Fish Swimming, Big Fish Errors) that alerted the team in real-time when trial users hit errors, enabling proactive outreach that prevented losing ~80% of early customers
- →Deliberately avoided hiring for 2 years post-YC, growing to nearly $1M ARR before first hire, which forced founders to master all functions personally
- →YC batch provided warm launch audience - sold to batch companies like Brex, reaching $11K MRR before Demo Day
- →Started with high price quotes ($2,000-2,500/month) and negotiated down, discovering willingness-to-pay through real conversations rather than underpricing
- →Hacker News launch with revised 'internal tools' and 'low code' messaging transformed the business from outbound to inbound overnight, generating 5-20 company signups daily
Challenges
- !Initial messaging ('Excel with higher-order primitives') was too abstract and generated zero traction on Hacker News
- !Targeting FileMaker developers via LinkedIn yielded sub-2% response rates with all negative feedback
- !PMF felt gradual rather than explosive - every customer felt like the last one they would find, creating constant uncertainty until reaching ~40 logos
- !Pivoting from failing fintech with less than 60 days of runway and burning $1,000 per day
Target Audience
Software engineers at operationally-heavy companies who need to build internal tools like admin dashboards, customer support panels, and data management interfaces
Problem Solved
Developers spend enormous time building internal tools that all look the same (tables, buttons, forms, dropdowns). Despite being 50-60% of all code written, these tools get minimal engineering investment because they're not customer-facing. Retool eliminates repetitive boilerplate code while preserving the flexibility developers need.