Fog Mode vs Key Changer

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Fog Mode compared with Key Changer
Detail	Fog Mode	Key Changer
What it does	Free Chrome extension with reading tools, focus aids, and wellness breaks for managing brain fog while reading	Change the key of audio in your Chrome tab while keeping vocals natural
Stage	Startup	Not given
Founded	2025	Not given
Based in	Not given	Not given
Pricing model	Free	Free
Pricing	Not given	Not given
Key features	Larger, roomier text formatting Focus line guide for reading Clean reader interface Auto-scroll functionality Ambient sounds Breathing break reminders Integrated notes feature	Pitch shift from −12 to +12 semitones Fine-tuning by ±50 cents Keep vocals natural mode enabled by default Preserves playback speed while changing pitch Works with YouTube, YouTube Music, Spotify Web, SoundCloud Video stays synchronized with processed audio Remembers pitch preferences for each song Keyboard shortcuts for pitch adjustment Processes audio locally with no uploads Powered by Key Changer Engine for natural pitch shifting
What makes it different	Designed specifically for people with brain fog Combines reading assistance with wellness features like breathing breaks Completely free with no paywalls or premium tiers	Preserves natural vocal character while shifting pitch Processes audio locally in browser, no data uploaded Works with most major streaming platforms without additional setup Video stays perfectly synchronized with pitch-shifted audio
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	2 +1 (up) since last check	2 no change since last check
Trust Flow (Majestic)	0	0
Citation Flow (Majestic)	15	12
Referring domains (Majestic)	4	2

4 details filled in for both companies.

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