AI Side Hustles
Business Model

AI Health & Fitness Apps

Founders who built health and fitness apps around an AI feature, such as estimating calories from a photo, coaching a lift or a sport, or helping users quit sugar. Many were built with AI coding tools by founders who had not shipped an app before. Figures below are computed from the cases listed on this page and are what each source reports, not typical results.

Calorie trackers, workout coaches and habit apps with AI at the core.

Cal AI social preview showing the app scanning a plate of pancakes and listing calories and macros.
Screenshot of the cutcoach.app homepage.
Wrestle AI app icon: a blue wrestler figure inside scan brackets.
Startup Cost in Our Cases
A $2,000 marketing test in the one case that discloses a cost
Time to First Revenue in Our Cases
About one month in the one case that says; two others say they reached the App Store in about 19 days and about two months
Published Cases
9 Published
Independently Documented
2 of 9

Strengths Seen in Our Cases

  • People already pay for fitness and diet help
  • A photo or video feature is easy to demo on social media
  • Subscriptions can compound once an app finds its audience

Known Risks

  • Health and nutrition claims need care
  • Growth in several cases depends on paid ads or influencers
  • Easy to copy, so competitors appear quickly
Gallery

Images and videos from AI Health & Fitness Apps cases

Cal AI social preview showing the app scanning a plate of pancakes and listing calories and macros.Image: Cal AI
Cal AI (Zach Yadegari and Henry Langmack)Watch original video (opens YouTube in a new tab)
Screenshot of the cutcoach.app homepage.Image: cutcoach.app
CutCoach (Ethan)
Wrestle AI app icon: a blue wrestler figure inside scan brackets.Image: Wrestle AI (official App Store listing)
Wrestle AI (George Lampropoulos)
3AK Track and Field app icon: gold 3AK letters on black.Image: 3AK Track & Field (official App Store listing)
3AK (Christian and Braylin)
Maxed app icon: a blue crossed dumbbell mark on white.Image: Maxed (official App Store listing)
Maxed AI (Max Hirsch)
Video thumbnail: How David Built a $14K/Month App Helping People Quit SugarVideo: notJust․dev
STOPPR (David Attias)Watch original video (opens YouTube in a new tab)
Social preview image from calbuddy.co.il, the official site.Image: calbuddy.co.il
Tomer (AI calorie tracker app)
Social preview image from footballgpt.co, the official site.Image: footballgpt.co
FootballGPT (Kevin Middleton)
Erly app icon, a white rising sun over a curved horizon on a black rounded square.Image: Erly (official App Store listing)
Erly (Jake Glacer)

How the model works

General guidance

A founder builds a phone app around one AI feature, such as estimating calories from a photo or analysing a workout video.

Many of the documented founders built the app with AI coding tools.

Growth in the cases often comes from TikTok, influencers or paid ads.

How it earns

General guidance

Weekly, monthly or yearly subscriptions through the App Store and Google Play.

App stores take a share of each sale.

General guidance is our editorial summary and contains no figures. Every number on this page comes from a linked case.

Reported results

What the cases report, and how well it is backed up

Figures are as reported by each source, for different periods and metrics. They are not typical results. How we label evidence.

Case Studies

AI Health & Fitness Apps Cases

9 case studies
Cal AI social preview showing the app scanning a plate of pancakes and listing calories and macros.
Image: Cal AI
September 6, 2025
1 source

Cal AI: a teen-founded photo calorie tracker with about $1.4 million monthly gross profit

Cal AI (Zach Yadegari and Henry Langmack)

Cal AI lets users photograph a meal and get an AI estimate of its calories. Launched in May 2024, it is priced at $2.49 a month or $29.99 a year. CNBC reported about $1.4 million a month in gross profit and about $274,000 a month in net operating income, with a team of 30.

Read original sourceWatch original video
Reported figure
About $1.4M/mo gross profit
Evidence levelIndependently Documented
Tools:none named in the source
Inspect Case
Screenshot of the cutcoach.app homepage.
Image: cutcoach.app
April 9, 2026
1 source

A 19-year-old college dropout built a weight-cut app with Cursor that makes $20,000 a month

CutCoach (Ethan)

Ethan, a 19-year-old former provincial judo champion, left a computer engineering program after realising AI could build in a day what took him a week. His app CutCoach creates science-based weight-cut plans for combat sport athletes.

Read original source
Reported figure
$20K/mo(revenue)
Evidence levelSelf-Reported
Tools:
Inspect Case
Wrestle AI app icon: a blue wrestler figure inside scan brackets.
Image: Wrestle AI (official App Store listing)
December 15, 2025
1 source

A college student who cannot code built an AI wrestling coach app that makes $17,000 a month

Wrestle AI (George Lampropoulos)

George Lampropoulos, a college student who had never written code, vibe coded Wrestle AI and went from idea to the App Store in one month. He says it makes over $17,000 a month.

Read original source
Reported figure
$17K/mo(revenue)
Evidence levelSelf-Reported
Tools:none named in the source
Inspect Case
3AK Track and Field app icon: gold 3AK letters on black.
Image: 3AK Track & Field (official App Store listing)
June 28, 2026
1 source

Two college track athletes with no coding background built an AI track app that makes $20,000 a month

3AK (Christian and Braylin)

Christian and Braylin, college track athletes, built 3AK, a track and field app that tracks workouts, analyses form and meals, and has a community. They report about $70,000 in total revenue, 40,000 users and over $20,000 a month.

Read original source
Reported figure
$20K+/mo(revenue)
Evidence levelSelf-Reported
Tools:
Inspect Case
Maxed app icon: a blue crossed dumbbell mark on white.
Image: Maxed (official App Store listing)
October 7, 2026
1 source

A Michigan grad who had never built a mobile app made an AI lifting coach app that brings in about $14K to $15K a month

Maxed AI (Max Hirsch)

Max Hirsch graduated from the University of Michigan after summer internships in finance that he says he did not enjoy. After an earlier app idea stalled because he could not code, he saw people with no coding background shipping apps and started building with Claude. Lifting was his favorite hobby, so he built Maxed AI, an all-in-one lifting and health app. He says it has about 1,000 active subscribers, 20,000 iOS downloads and brings in roughly $14,000 to $15,000 a month.

Read original source
Reported figure
About $14K to $15K a month(revenue)
Evidence levelSelf-Reported
Tools:
Inspect Case
Video thumbnail: How David Built a $14K/Month App Helping People Quit Sugar
Video: notJust․dev
October 30, 2025
1 source

A finance worker in France cloned a successful app with Cursor for a new niche and says it now makes $12K a month

STOPPR (David Attias)

David Attias was working a regular finance job when he found a mobile app making $200,000 a month. He thought he could build something better for a different audience. He rebuilt a one-for-one version with Cursor in about a month, changed the look and switched the niche to women who want to quit processed sugar. Five months in, he says it has 60,000 downloads.

Read original sourceWatch original video
Reported figure
$12K a month(revenue)
Evidence levelSelf-Reported
Tools:
Inspect Case
Social preview image from calbuddy.co.il, the official site.
Image: calbuddy.co.il
August 9, 2026
1 source

A marketer who is not a developer built a local-language AI calorie tracker with Cursor that he says makes over $80K a month

Tomer (AI calorie tracker app)

Tomer came from marketing and had only a little coding experience. He saw that a popular AI calorie tracking app did not exist in his local language, so he built one for that market. Like CalAI, the user takes a picture of a meal and gets calories and macros in seconds, but the app is in Hebrew and adjusted for local users.

Read original source
Reported figure
Over $80K a month(revenue)
Evidence levelSelf-Reported
Tools:
Inspect Case
Erly app icon, a white rising sun over a curved horizon on a black rounded square.
Image: Erly (official App Store listing)
July 5, 2026
1 source

A former accountant built a push-up alarm app with AI coding help and says it reached $50K a month in four months

Erly (Jake Glacer)

Jake Glacer, 24, trained as an accountant, earned his CPA and worked at a Big Four firm before teaching himself to code. To wake up early he used to promise a friend a video of himself doing push-ups by 6 a.m. He turned that habit into Erly, an alarm app you switch off by doing push-ups. He told Starter Story it launched at the end of 2025 and went from zero to over $50,000 a month in four months, with more than 200,000 downloads in 2026.

Read original source
Reported figure
Over $50K/month(revenue)
Evidence levelSelf-Reported
Tools:
Inspect Case
Startup costs

What the cases say they spent

The other 8 sources do not disclose a startup cost.

Risks

Challenges reported in these cases

Tools

Tools for AI Health & Fitness Apps

ChatGPT logo and wordmark on a blue and orange gradient.Official image

ChatGPT

AI Assistant

OpenAI's general-purpose AI assistant. In our documented cases it is used to draft reports, brainstorm product slogans, write first drafts of client posts, and generate code for digital products.

Free plan: Yes. Free plan with limits on uploads, image creation, and deep research.

Pricing: Free plan, plus paid Go, Plus, and Pro plans for individuals and Business and Enterprise plans for teams. Exact prices were not shown in the version of the page we could read; check the official page for your region.

Checked October 17, 2026

Used in 54 documented casesView Profile
Claude logo and wordmark on a cream background.Official image

Claude

AI Assistant

Anthropic's AI assistant. Documented cases use it to write long video scripts, draft newsletter summaries, and run client offers on a single monthly subscription.

Free plan: Yes. Free plan for chat on web, desktop, and mobile.

Pricing: Free plan. Pro is $20/month billed monthly or $17/month billed annually. Max starts at $100/month. Team seats start at $20/seat/month billed annually.

Checked October 17, 2026

Used in 46 documented casesView Profile

Cursor

AI Coding

AI code editor with an agent that writes and edits code. Several documented founders say they built their apps with it, often with little or no prior coding.

Free plan: Yes. Free plan with limited agent and chat requests.

Pricing: Free $0/month with limited AI usage. Plus $8/month, Premium $30/month, Super $100/month, Ultra $200/month, Teams from $30 per user per month. Third-party model usage is billed separately at API list price. Plans are sold together with X and Grok features.

Checked October 20, 2026

Used in 26 documented casesView Profile

OpenAI API

AI Model API

OpenAI's developer platform for building GPT models into your own apps. Documented founders use it inside voice-note apps, resume and cover letter tools, writing assistants and support agents. This is separate from a ChatGPT subscription.

Free plan: No free plan listed; usage is billed per token.

Pricing: Pay as you go, priced per 1 million tokens and varying by model. For example, the official page listed gpt-6-luna at $0.10 per 1M input tokens and $0.50 per 1M output tokens (standard), and gpt-6-astra at $10.00 input and $50.00 output.

Checked October 20, 2026

Used in 14 documented casesView Profile
Dark Claude Code Docs preview card reading Getting started, Overview, and a line describing Claude Code as an agentic coding tool.Official image

Claude Code

AI Coding Agent

Anthropic's agentic coding tool. It reads a codebase, edits files and runs commands from the terminal or an IDE. Documented founders say they used it to build mobile apps, a data API and a store builder, and to run daily content and client routines. This is separate from chatting with Claude itself.

Free plan: No. The official comparison lists Claude Code on Pro and Max, not on Free.

Pricing: Included in the paid Claude plans, not the Free plan. Pro is $20/month billed monthly or $17/month with annual billing; Max starts at $100/month with higher usage.

Checked October 27, 2026

Used in 12 documented casesView Profile
Supabase logo with the lines Build in a weekend, Scale to millions, on a dark background.Official image

Supabase

App Backend

A hosted Postgres database and app backend with sign-in, storage and APIs. Documented founders who built with AI coding tools list it in the stack behind an AI lifting app, an AI video clipping app and an AI store builder.

Free plan: Yes. Free projects are paused after 1 week of inactivity, with a limit of 2 active projects.

Pricing: Free plan at $0 with 500 MB of database and 50,000 monthly active users. Pro is from $25/month and Team from $599/month; usage above plan limits is billed extra.

Checked October 27, 2026

Used in 3 documented casesView Profile
FAQ

AI Health & Fitness Apps: common questions

How much do people make with AI Health & Fitness Apps and AI?

Across the 9 of our 9 sourced cases that report a monthly figure, amounts range from $5,356 to $1,400,000 a month, with a median of $20,000. These are what each source reports, not typical results.

How much does it cost to start?

A $2,000 marketing test in the one case that discloses a cost. 1 of 9 cases disclose a startup cost.

How long until the first dollar?

About one month in the one case that says; two others say they reached the App Store in about 19 days and about two months. This comes from what our cases report.

Which AI tools do these cases use most?

Cursor (3 cases), Claude (3 cases), Claude Code (2 cases), ChatGPT (1 case), Supabase (1 case). Only tools named in the sources are counted.

How reliable are these income figures?

2 of 9 cases are independently documented, meaning a news outlet says it reviewed records. 7 are self-reported. Every case links its source.

What are the main risks?

Health and nutrition claims need care. Growth in several cases depends on paid ads or influencers. Easy to copy, so competitors appear quickly.

How many of these cases say when they made their first dollar?

2 of 9 cases state a time to first revenue. For example: STOPPR (David Attias): "About one month; he says the first month of revenue was 5,000"; Tomer (AI calorie tracker app): "About two months from the first line of code to the App Store, by his account". The rest do not say, so treat any single timeline as one example, not a norm.

What went wrong or held these cases back?

9 of 9 cases list limitations or risks drawn from their sources. Examples: Cal AI (Zach Yadegari and Henry Langmack): Ad spending of about $770,000 a month makes margins sensitive to ad costs; CutCoach (Ethan): Self-reported; Wrestle AI (George Lampropoulos): Self-reported. Each case page lists them in full.

Do I have to report this income to the IRS if I never get a 1099-K?

Yes. The IRS says that whether or not you receive a Form 1099-K, you must report all income from selling goods or services on your tax return. Payment apps and online marketplaces must send a 1099-K when payments for goods or services total over $20,000 in more than 200 transactions, but they may send one for lower amounts. Source: IRS, "Understanding your Form 1099-K" (irs.gov/businesses/understanding-your-form-1099-k), checked 2026-10-20. General information, not tax advice.

Do I owe self-employment tax on side hustle income in the US?

According to the IRS, you must pay self-employment tax and file Schedule SE if your net earnings from self-employment were $400 or more. The rate is 15.3% (12.4% Social Security and 2.9% Medicare), and you may need to pay estimated taxes quarterly. Source: IRS, "Self-employment tax (Social Security and Medicare taxes)" (irs.gov/businesses/small-businesses-self-employed/self-employment-tax-social-security-and-medicare-taxes), checked 2026-10-20. General information, not tax advice.

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Playbook

Step-by-step playbook for this model