Lark: Product, team and how it was built

Solo founder · 25 months after launch, revenue growing

Tradespeople already use WhatsApp all day on the job site, and many write quotes by hand or in a spreadsheet. Tutti puts the office work into that chat, so the customer has nothing new to install or learn. It sends messages through Meta's official WhatsApp Business Platform, which lets one founder run the service without a phone app as the main product.

Started small, grew after funding · 38 months after launch, revenue growing

It sold to large companies from the first months, together with a network of human mentors, and an investor reported that it made €30,000 a month within a few months of launch. The founders then turned the mentoring business into a platform built on skills data, raised a €5.8M Series A in 2025, and the managing director of Techstars Torino reported €3.6M in annual recurring revenue in February 2026.

Started small, grew after funding · 9 months after launch

Large companies run many HR systems that do not share data, so a single case such as a new hire passes through several of them by hand. Ahron does not replace those systems; it connects to them, measures where cases wait, and places agents there. The founders had sold an earlier HR software company, and the product is built on Celonis, a Munich process-mining company whose partnership, the founder says, brings in requests from around the world.

Started small, grew after funding · 12 months after launch

The founders came from a company that did outsourced purchasing for other firms, so they knew which purchasing tasks were still done by hand in email and spreadsheets. Soource turned those tasks into agent workflows for large companies. One article from the South Summit Madrid 2026 conference reported 800K in annual recurring revenue and 58 enterprise customers, without a currency and without saying who gave the figure.

Started small, grew after funding · 36 months after launch, revenue growing

French renovation quotes depend on subsidy and tax rules that change every few months, and the small firm that installs the equipment bears the risk of a wrong file. Argile puts those rules and the building calculation methods into the software, so a salesperson can give a detailed quote within an hour of a visit instead of weeks later.

Team of 2 to 10 · 10 months after launch, revenue growing

Food distributors still take many orders by email, text message and phone and type them into old ERP systems by hand. The two founders worked inside a Boston seafood distributor for months to map that work before they built the product. Then they sold it themselves to large distributors: an a16z speedrun newsletter of January 2026 says one enterprise deal with a publicly traded distributor took their booked revenue past US$500,000.

Solo founder · 36 months after launch, revenue flat

The first customers came from a lifetime-deal sale on AppSumo, at a time when the product had no AI at all. That gave about a thousand users, word of mouth and a Powered by Guidejar link on every free guide. From April 2024 the founder sold subscriptions instead, and added AI writing, voiceover and translation to the paid plans, metered in credits.

Solo founder · 35 months after launch, revenue falling

It reached people inside the chat app that they already open all day, so capturing an idea on a phone took one voice note. It aimed first at Notion users, whom the company told that ideas get lost on the phone. Ads on Facebook and Google then paid for fast growth in early 2026, until the founder stopped them in August 2026 because the costs were larger than the revenue.

Solo founder · 9 months after launch, revenue growing

Candidates for consulting jobs need dozens of practice cases, and the usual options are a free peer partner of uneven quality or a coach who charges US$100 to US$300 an hour. A language model can play the interviewer at any hour for US$49 a month. The founder wrote that the customers come from search: the sitemap lists 596 blog pages written for Google and for AI assistants.

Team of 2 to 10 · 18 months after launch, revenue growing

The free part does what the market leader charges for: unlimited game reviews, where Chess.com gives free users one a day. Because the engine runs on the player's device, each free review costs Chessigma almost nothing, so the free tool could grow to about 900,000 visitors a month. Revenue started only when the AI coach went on sale in May 2026: TrustMRR shows US$42 in April 2026 and US$3,738 in May 2026.

Started small, grew after funding · 26 months after launch

Applications for European and national public funds are long, bureaucratic and usually written by specialist consultants. Granter put the consultant's work into an AI agent that a company can use itself, started in Portugal, where EU funds are a large part of company financing, and then won two large European startup competitions in seven months.