defog: Beat Brain Fog
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.
defog: Beat Brain Fog
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.
Ranked #4970 on TrustMRR
8 active subscriptions
NetherlandsRevenue is verified with
RevenueCat API key.Last updated: Oct 20, 2026, 12:34 PM
Find out what's causing your brain fog. A quick daily check-in plus AI-generated weekly reports reveal your personal triggers and what actually helps.
Helps users understand and manage recurring brain fog by tracking their mental clarity and identifying possible triggers.
Audience
Individuals experiencing brain fog and seeking to improve mental clarity
Pricing
Free · Hard-Paywall, Defog Premium Monthly $14.99, Quarterly $29.99, Annual $59.99
Team size
1 person
Funding
Bootstrapped
1 rating onApp Store
Marketing channels
Tech stack
Backend
Additional info
Insights and reports generated by AI, Free mode available, Premium subscription options
Screenshot
apps.apple.com"Selling because I've moved on to another project. Defog currently runs on $0 ad spend and still converts trials into paying subscribers. Clear upside for a new owner: optimising onboarding, turning ads back on, or running UGC content should lift revenue fast. Includes source code, RevenueCat setup, brand assets, the defogapp.com domain, and the Instagram and TikTok accounts."
Miro
Founder of defog: Beat Brain Fog
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