Consumer health
Cal AI
Point a phone at a plate and it counts the calories. Two teenagers built it.
Not a weekend build — the first version took months, leaning almost entirely on existing AI models rather than on the founders writing a backend. · source
What it is
Cal AI is a calorie tracker that works from a photograph. You take a picture of a meal and it estimates the calories and macros, which removes the part of food logging everybody quits over — typing in every ingredient.
It was built by two high-school students and reached over 15 million downloads and more than $30 million in annual revenue in under two years, on a team of seven. In March 2026 it was acquired by MyFitnessPal, the incumbent it had been taking share from.
The monthly numbers are the more useful ones, and they are unusually well documented: $28,000 in month one, $115,000 in month two, $1M in monthly recurring revenue by month six, a plateau around $2M a month, and $5.7M a month by January 2026. The headline figure below is the annual one because that is what TechCrunch reported at the acquisition; the month-by-month trail is in the timeline, sourced separately.
Timeline
- 8 Apr 2024First released on the App Store. source
- 31 May 2024$28,000 in the first month. source
- 30 Jun 2024$115,000 in month two. source
- 30 Nov 2024$1M in monthly recurring revenue, six months in. source
- 16 Mar 2025Past a million downloads; TechCrunch covers it. source
- 30 Jun 2025Plateaus around $2M a month as the influencer channel saturates. source
- 31 Jan 2026$5.7M in monthly revenue — against $1M+ a month in ad spend. source
- 2 Mar 2026Acquired by MyFitnessPal. The team of seven stays on. source
Founders
How it broke out
Cal AI did not break out on one post. It climbed the App Store health charts steadily enough that MyFitnessPal noticed it on Sensor Tower and started watching — which is how the acquisition began.
The founders' own visibility came separately: Zach Yadegari's post about being rejected by most of the colleges he applied to, while running an app doing millions in revenue, went viral on X and put the story in front of everyone who had not heard of the app.
Paid advertising
We have not checked this app for paid advertising yet. That is not the same as finding none.
In the news
- MyFitnessPal has acquired Cal AI, the viral calorie app built by teens
The incumbent buys the upstart that was taking its users, and keeps the seven-person team.
- Cal AI: How a teenage CEO built a fast-growing calorie-tracking app
- Photo calorie app Cal AI, downloaded over a million times, was built by two teenagers
- $0 to $50M+ ARR in 18 months — then acquired by MyFitnessPal
Where the month-by-month revenue trail and the $1M/month ad spend come from. A case study, not reporting.
- How Cal AI scaled paywall experimentation and grew monthly revenue 3x+ in 10 months
123 A/B tests, 160 paywall designs, 31% better trial-to-paid. Published by their paywall vendor.