Even Air HR, a Small HR Tool with $40K in Annual Revenue, Found a Buyer — the Market Where the "Smallest SaaS" Still Sells

Note: yen conversions in this article are rough estimates at ¥150 per dollar.

The SaaS sales that make the news are usually deals in the hundreds-of-millions-of-yen ARR class. This one (a product with $40K (about ¥6 million) in annual revenue, a scale that in Japanese indie-developer terms barely clears the “success line,” finding a buyer and closing in six figures (over $100,000)) is rare public data precisely for that reason. Where does the “too small to sell” line actually sit? This case pulls that boundary down substantially.

The Numbers

If the sale price was at least $100K against $40K in annual revenue, that is 2.5x revenue or more, a ratio worth recording as a data point for micro-SaaS market rates.

A Byproduct Born from “Internal Frustration”

Founder Nick Holzherr is a serial entrepreneur who reached the finals of the BBC’s entrepreneurship reality show “The Apprentice” in 2012. His main business was the recipe app Whisk, and Air HR spun out of it in 2016 as the “smaller product.” The trigger was the Whisk team’s frustration with existing HR tools, “either half-baked or too expensive,” and clunky besides. A textbook product born from an internal problem: they built what they themselves wanted.

The design philosophy was “hub and spoke”: employee records, leave, and HR files at the core, with a simple structure where you enable only the modules and integrations you need. His co-founders were CTO Viktor Taranenko and COO Rachel Maclean (who left in 2017 for politics and later became a UK Member of Parliament). They raised £150K (about $200K) and reached profitability in 2017.

Growth after that, however, was gentle: at the time of sale, annual revenue was $40K with about 3,000 free and paid users combined. Holzherr’s day job was full-time at Samsung following the Whisk sale, and Air HR had become a product maintained on the side, “running, but not growing.”

The Sale Process — an M&A Consultant Hired on Upwork

The most practically interesting part of this case is how it was sold. Holzherr hired not an investment bank or a broker but an M&A consultant on Upwork, paid by the hour. Total cost: a few thousand dollars. Holzherr had been assembling distributed teams since around 2012, back when Upwork was still called “Elance”, so using contractors was already a practiced skill. The consultant listed Air HR on acquisition marketplaces while directly contacting about 10 candidate companies in parallel. Running passive listing and active outreach simultaneously built a pool of candidates, which was narrowed over several months to two finalists, with KarbonPay chosen for the best strategic fit.

The buyer, KarbonPay, is a global payroll SaaS based in Texas. HR management and payroll are contiguous in both data and customers, so Air HR’s client companies become direct cross-sell targets for payroll. This was a deal that closed not on revenue scale but on customer-list and domain fit.

Why ¥6 Million in Annual Revenue Commands a Price

For an adjacent SaaS, “customer overlap” matters far more than “smallness.” What KarbonPay bought was not $40K of revenue but a working product, roughly 3,000 real users, and a channel into which it can sell its flagship offering. What was valued was the three-part bundle of “a running product + real customers + adjacency fit”, and when those align, a deal can close even at ¥6 million in annual revenue. Conversely, however technically excellent a product is, no buyer appears without customers.

As a yardstick of scale, this case fills the gap between the VBA tool that traded for $2,223 on Microns and Lionize, sold at $1.5M ARR, showing that the micro-SaaS exit market exists as a staircase of price points.

The Limits of This Case, and Cautions in Reading It

Several conditions need discounting before this record is applied elsewhere. The seller’s profile is one: Holzherr is a serial entrepreneur with exit experience, including the Samsung sale of his main business Whisk. The process design (hiring a consultant, approaching 10 candidates, playing two finalists against each other) is not a beginner’s move. The product’s origins are another: Air HR was built with £150K in funding, so its initial product polish was better than a purely solo project’s. And the sale price is disclosed only as “six figures,” where $100K versus $900K mean completely different things. That width limits its precision as market-rate data.

One more thing not to overlook is the time axis. Founded 2016, sold 2022. It was precisely because a “small SaaS that stopped growing” was kept running for six years that the sellable state (customers retained, product working) was preserved. Had it been abandoned and its users scattered, this deal would not have happened.

What This Means for Japanese Indie Developers

In Japan too, stalled indie SaaS products tend to be processed in one leap: “not growing anymore → shut it down.” The practical implication of this case is to insert one step into the wind-down flow, before closing, list a handful of adjacent businesses that would want your customer list, and reach out. The fact that Holzherr executed that with an hourly Upwork consultant and a few thousand dollars means the cost of finding a buyer has never been lower. Including minimal-scale marketplaces like Microns, the path that converts years of development into a few million yen is open even to a product doing ¥500,000 a month.

After the sale, Holzherr continued working at Samsung while angel investing, and launched Gitlaw, an open-source collection of legal document templates. For him, the Air HR sale was not a make-or-break gamble but a matter-of-fact tidying of assets, cashing out one card in the portfolio to fund the next. That temperature is the true face of a sale at this scale.

Related Reading

• Microns — the micro-SaaS trading market starting at $2,223
• Lionize — a $1.5M ARR sale to an adjacent buyer