Vespper: Product, team and how it was built

Started small, grew after funding · sold 11 months after launch

Its founders wrote some of the methods that the industry already used to run models cheaply, such as AWQ for 4-bit weights. They turned that research into a paid serving API. They proved the speed on a public benchmark and partnered with a cloud company that needed exactly that speed. Eleven months after its first public post, the partner agreed to buy it.

Started small, grew after funding · sold 37 months after launch

It aimed at regulated enterprises that needed AI agents on their own servers, with audit logs. The company said in 2025 that hundreds of organizations used it. Asana bought it in May 2026. Asana's quarterly report states the price.

Solo founder · 2 months after launch, revenue flat

AI coding agents can build a working page or deck, but in the founder's words their visual output often looks generic. Skillry sells finished visual styles, one task per Skill, shows real output before the sale, and adds new Skills almost every day under one subscription. When sales began on 28 September 2026, they held at about US$430 a day for 17 days.

Solo founder · 12 months after launch, revenue falling

It launched in October 2025. By then, Anthropic's Claude Code had made skills, slash commands and subagents a normal way to steer a coding agent. Most developers were still writing their own. A founder who presents themself as a CTO with 18 years of experience sold a tested set as a one-time purchase with a money-back promise. Verified revenue reached US$16,040 in March 2026 and US$82,195 in total, but it fell to under US$2,000 a month by September 2026.

Solo founder · 4 months after launch, revenue falling

Said over US$36K in a monthRecords US$39.6K by end of JulyHeld

It turned a new working habit into a native Mac app. The habit was running several AI coding agents at the same time. The app had voice control and a strong visual style, and it charged once instead of every month. The founder sold it to his own audience through daily live streams, X and a Discord community. Stripe recorded more than three quarters of the revenue in the first seven weeks.

Solo founder · 6 months after launch, revenue growing

The compression engine already existed as a free, open-source Python tool, but it was hard to install. Garm Lucassen packaged it into a desktop app. The app installs with a double click, connects the coding agents by itself, and removes its changes when it quits. The engine's creator suggested that he build it and keep the Headroom name. Developers who hit the usage limits of their AI plans pay a small monthly price to make those limits last longer.

Solo founder · 4 months after launch, revenue flat

The demand existed before the app. Photos that look as if a compact digital camera from the 2000s took them have been a trend on TikTok since at least 2022. Boothie sells that look without the camera, for a small weekly price, to the people who already post such photos. The founder says every user came from TikTok picture posts made by about a dozen accounts in three countries, with no paid advertising. One person could build it because the image model is rented from Google and paid for by the picture.

Team of 2 to 10 · 22 months after launch, revenue falling

It starts from the student's own course files instead of general knowledge. As a result, answers and practice questions point back to the material that the class uses. A free plan with monthly limits lets students try it, and Pro is sold by the week or by the month. Stripe shows about US$13,200 a month at the end of 2025. The seller says growth came with little to no marketing, and no source explains how students found it.

Solo founder · 15 months after launch, revenue falling

Many recipes now live in short videos, where the ingredients are spoken or shown and never written down. A model that can watch a video and write out a structured recipe turned an old app category into something that works for these videos. That category is the recipe keeper. One developer built it on rented models and sells it through the app stores as a subscription.

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.

Team of 2 to 10 · 29 months after launch, revenue flat

The first apps that combined OpenAI's Whisper and ChatGPT for voice notes appeared in 2023, and the founder found them "not implemented well enough". His team built a simpler one, and collected early users and feature requests through lifetime deals on AppSumo in 2024. In 2025 it grew with advertising and paywall tests measured in Adapty's subscription data.

Solo founder · 14 months after launch, revenue falling

A carousel needs both writing and design. Draft AI asks for a minute of speech instead and returns finished slides, plus scripts, threads and hooks from the same recording. It charges before the first result, so everyone who uses it has subscribed or started the trial of a paid plan.

Team of 2 to 10 · 11 months after launch, revenue growing

People who plan a haircut or a new colour cannot see the result before the salon has done it. The app shows it on the user's own photo in seconds. It uses Google's Gemini model to analyse the hair and fal.ai to generate the image, as its privacy policy states. Revenue was close to zero until March 2026. In April 2026 the seller shipped a redesigned onboarding, a new paywall, a coin system and translations. From then revenue rose every month, to US$17,882 in October 2026 up to 26 October, as TrustMRR reads it from the billing account.

Team of 2 to 10 · 19 months after launch, revenue falling

It turns a label that most shoppers cannot read into one personal number. The diets are ones that a general calorie app does not cover: low FODMAP, seed-oil-free, gluten-free, vegan. The store page says that analysis needs a subscription, so every active user pays. Verified revenue reached US$23,122 in its best month, February 2026, and US$178,939 in total, read from the app's billing account.