PrintCash with AI
MediumMobile AppFrontierClear niche and buyerAI model/API accessPayments via RevenueCat
Verified

Brain Fog Pattern Tracker App

Defog is an iOS app that helps people with persistent brain fog figure out what's behind it. Users do a quick daily check-in (sleep, meals, caffeine,…

In plain English

Defog helps people with ongoing brain fog find out what might be causing it. Users do a quick daily check-in on sleep, meals, caffeine, stress, screen time, exercise, water and supplements. The app spots patterns, suggests small tests and sends weekly and monthly reports, with a subscription. TrustMRR shows about $90 a month in recurring revenue, and it is not a medical diagnosis.

Automation85%
Startup cost~$99
Time to first $Not disclosed
Monthly range*$90 MRR

~$90 MRR; $60 verified revenue last 30 days (TrustMRR/RevenueCat, Oct 29, 2026)

DifficultyMedium
SourceTrustMRR - defog: Beat Brain Fog ↗

Operator: Not disclosed on TrustMRR

Verified

Revenue independently checked: documents reviewed by a publication, or a public dashboard.

Apple Developer $99/yr; other costs not disclosed.

The tool stack

RevenueCat ↗
Free up to $2.5k MTR

Mobile subscriptions

 OpenAI API ↗
Pay per token

LLM / vision

 App Store ↗
$99/yr

iOS distribution

Prices are the vendors' published list prices as researched in Oct 2026 and change often — always check the vendor's pricing page.

Step-by-step setup

  1. Pick one daily job (capture, transcribe, convert).
  2. AI does the heavy lifting on device or via API.
  3. Subscription after a free trial.
  4. App Store search + organic short-form content.

What's automated vs. the human 15%

The machine does

  • Core AI generation/analysis
  • Billing and onboarding

You still do

  • Product quality and support
  • Distribution and marketing
  • Compliance and edge cases

Overview

Defog is an iOS app that helps people with persistent brain fog figure out what’s behind it. Users do a quick daily check-in (sleep, meals, caffeine, stress, screen time, exercise, hydration, supplements), the app detects patterns, suggests small experiments, and delivers a Weekly and Monthly Insight Report. Native SwiftUI, RevenueCat subscriptions (yearly with 7-day trial, quarterly, monthly), hard paywall, custom brand identity.

Operator: Not disclosed on TrustMRR. Category on TrustMRR: Health & Fitness. Founded: 2026-07-01. Website: https://apps.apple.com/us/app/defog-beat-brain-fog/id6759842176?uo=4

Estimated split: about 85% of the work automated, 15% human.

Realistic income

TrustMRR (checked Oct 29, 2026) shows about $90 MRR and $60 in RevenueCat-verified revenue over the last 30 days, $317 verified over its tracked history. This is one operator’s result, often after months or years of work, and doesn’t predict yours. Check the live listing — numbers change.

Risks

  • Platform fees and review rules.
  • Big apps may add the same feature.
  • Startup cost and time to first dollar are not disclosed.

*Income figures are illustrative ranges based on public pricing and typical outcomes reported by practitioners, not guarantees. Most new online businesses earn little or nothing at first. Not financial, legal or tax advice.

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