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 #5428 on TrustMRR
6 active subscriptions
NetherlandsRevenue is verified with
RevenueCat API key.Last updated: Nov 15, 2026, 06:27 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
Product updates
More startups for sale
View MarketplacePrivate Enterprise
This saas analyzes text to determine whether it was written by AI - such as ChatGPT, Claude, Gemini, or any other LLM. It’s also the perfect tool to humanize AI-generated content, making it read completely human.
Revenue (30d)
$357
Asking Price
$6k
$4k
Multiple
0.9x
Private Enterprise
Become the chancellor, win elections, and govern Germany in this political simulation game.
Revenue (30d)
$329
Asking Price
$5k
Multiple
1.3x
Hidden Business
A consumer health app in a chronic-condition niche, live on iOS and Android and localized in 5 languages. Growth is fully organic from app store search, with no ad spend. There is no backend and no server cost. Subscriptions and a lifetime plan run through RevenueCat, so the revenue shown here is verified at source. Product details, app name and store links are shared with serious buyers under an NDA.
Revenue (30d)
$1.1k
Asking Price
$12k
$5k
Multiple
0.4x
PDF Vault
PDF Vault is a done-for-you digital business-in-a-box. Members license ready-to-sell PDFs that come with a hosted sales page, and they keep 100% of their sales. It earns money two ways: one-time license fees plus recurring monthly hosting. Tiered pricing raises the price as licenses sell, so each product earns more as it fills and early buyers move fast. Licenses are capped, and new products launch in weekly drops, so the doors open just once a week. That scarcity creates real urgency.
Revenue (30d)
$8.8k
Asking Price
$81k
Multiple
0.8x
Vid.AI
Turn any idea or script into ready-to-post videos that get views. AI generates voiceovers, visuals, and edits – all in minutes, no skills needed.
Revenue (30d)
$39k
Asking Price
$1.5M
Multiple
3.2x
Unnamed Company
AI Social Media
Revenue (30d)
$5.4k
Asking Price
$95k
Multiple
1.5x