AI close management

Double

Formerly Keeper

How 79 browser tabs became software for 4,000 firms

As a startup CFO, Ben Stein ran the month-end close on email, spreadsheets and printouts. With his USC friend Kenny Song he built Keeper, now Double, which more than 4,000 firms were using for their close by December 2025.

Spotlight Images: Double

Double co-founders Kenny Song and Ben Stein taking a selfie in front of a red rock arch in the snow

4,000+firms running their month-end close in DoubleCompany-reported, as of Dec 2025 · Source for 4,000+ firms running their month-end close in Double
150%net-dollar retention, as stated in the Series A releaseCompany-reported, as of Dec 2025 · Source for 150% net-dollar retention, as stated in the Series A release
~1,000hours saved a month across all clients at one customer, Attivo PartnersCompany-reported, as of Aug 2026 · Source for ~1,000 hours saved a month across all clients at one customer, Attivo Partners

Founders: Ben Stein; Kenny Song
HQ: New York, US
Founded: 2020
Sector: Accounting practice and close management
Website: Visit Double

Born Capital is an investor in Double.

The story

Seventy-nine tabs

Double started with one overstretched finance chief. Ben Stein was CFO of Mira, an augmented-reality startup, and owned its finances from the ledger to the board deck. Closing each month meant chasing answers by email, patching spreadsheets and keeping about 79 browser tabs open. He printed the P&L and kept notes in its margins. No single product held the close together. In 2020, with the pandemic raging, he decided to build one and called Kenny Song, a developer friend from their USC days in Pardee Tower. Song agreed on the spot.

Basement to Austin

Within weeks the two had set up in Stein's parents' basement, rent free, building an app for bookkeepers called Keeper. The first customer signed on February 8, 2021, and early users came through the bookkeepers.com community and Stein's own contacts. That summer Keeper joined a startup accelerator. The funding that followed moved the founders into a first office in Austin, Texas, which was really a living room. Calls with accounting firms showed that Stein's problem was everywhere, and much bigger for firms closing the books for dozens or hundreds of clients each month. Those calls became the roadmap.

The Double team working on laptops around long tables — The Double team at work.

Every client, one view

In October 2025 Keeper became Double, a name taken from double-entry bookkeeping, and the company is now based in New York. The product gives a firm one view of every client's close, a branded portal where clients answer questions and send files, and a two-way sync with QuickBooks Online, Xero, Sage and NetSuite. In a 2024 case study, MCO Bookkeeping, which keeps more than 500 QuickBooks files for UPS franchise locations, put its final review at as little as 12 minutes per client, down from about 90 minutes in 2021. At Cain Watters & Associates, a Top 100 firm that advises dentists, the Utah team grew from about 350 clients to 480 between early 2025 and August 2026 while adding two accountants.

AI, then a human

Double sorts bank-feed transactions by learning from a firm's own ledger history and flags anything new or unclear. Its AI Transactions agent turns a payroll report, a property settlement statement or a factory invoice into a draft entry. Ask Double, launched in May 2026, reviews a client's P&L or balance sheet on request and can create and assign tasks in the same chat. An MCP server lets assistants such as Claude, ChatGPT or Gemini work with a firm's Double account. Stein's principle is that AI prepares the work and an expert approves it, so a person signs off every close. JEA Financial, a New Jersey firm serving e-commerce brands, estimates that AI Transactions saves its team 100 hours or more a month.

Four thousand firms

In December 2025 the company said more than 4,000 firms in North America were running their month-end close in Double, together covering hundreds of thousands of businesses, and put its net-dollar retention at 150 percent. That month Double announced a $6.5 million Series A. In January 2026 Intuit named Double a Platinum partner, the top tier of its App Partner Program. At Attivo Partners in Denver, which serves nearly 500 venture-backed startups, setting up accruals once took two to three hours per client and now takes 30 to 45 minutes; Double's case study puts the time saved across all of Attivo's clients at about 1,000 hours a month. A team of about 80 still ships every week, and AI agents that run recurring tasks entered private beta in August 2026.

Visit doublehq.com

AI at Double

Double builds AI into a firm's close, from the bank feed to the client report, rather than offering it as a separate tool.

Suggests codes for bank-feed transactions from the firm's ledger history and flags new or unclear ones
Turns payroll reports and other source files into journal entries for review
Traces the cause of a reconciliation difference and points to the transactions that need attention
Drafts flux commentary and client summaries

The founders

Ben Stein
Co-founder and CEO
Before Double, Stein had stints in business analytics at Amazon and in operations at SpaceX, then served as a startup CFO, so he built the product for a job he had done himself.
Kenny Song
Co-founder and CTO
A software engineer, Song has led Double's engineering since the company began in 2020. He says he loves bookkeeping, React and rugby.

Milestones

2020
Ben Stein and Kenny Song start Keeper during the COVID-19 pandemic
2021Feb
First customer signs on February 8
2021
Joins a startup accelerator; first office in Austin follows
2025Oct
Keeper renames itself Double; same team, same product
2025Dec
$6.5M Series A; Double reports 4,000+ firms running their close on the platform
2026Jan
Intuit names Double a Platinum partner, its top App Partner tier
2026May
Ask Double, an AI assistant inside the close, launches for QuickBooks clients