PI Labs vs Nook

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

PI Labs compared with Nook
Detail	PI Labs	Nook
What it does	Small browser tools that stay out of the way	A Chrome extension that helps you stay focused, keep your place, and finish reading articles
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Freemium	Free trial
Pricing	Basic: $10/month (400 energy), Standard: $20/month (800 energy), Pro: $95/month (4,400 energy). Top up: $20 for 800 energy.	Free trial with full access to all features, no credit card required. After trial: $5/month or $39/year.
Key features	Energy-based usage model One Google account, no licence key Cancel any time	Autopace: guided reading that moves at your rhythm Bionic reading mode for faster word recognition Paragraph and line chunking to break down text walls Seven specialized fonts including OpenDyslexic, Lexend, and Atkinson Hyperlegible Calm background colors to reduce eye strain Distraction-free reading mode Works on any website, EPUB, or PDF No ads or interruptions Reading progress syncs across devices
What makes it different	Built solo and shipped frequently Small tools that stay out of the way Energy-based pricing scales with usage	Built specifically for ADHD brains, not generic readers Research-backed features grounded in peer-reviewed studies Every feature designed to reduce mental effort, not add to it 30-day money-back guarantee Cancel anytime with no questions asked
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)	8 no change since last check	2 no change since last check
Trust Flow (Majestic)	3	4
Citation Flow (Majestic)	16	23
Referring domains (Majestic)	16	14

5 details filled in for both companies.

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