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Helperbird vs Reader Mode: catalog facts
Helperbird	Reader Mode
Freemium Free to use, with a Pro subscription advertised at $20 a year during a sale.	Freemium Free with a paid tier for additional features.
Browser extension, iOS	Browser extension
Many accessibility tools combined in one extension Dyslexia fonts, spacing controls and colour overlays on any page	Adds text-to-speech and reading rulers beyond basic reader views Works across web pages and PDFs from one extension
Some tools require the paid Pro tier Proprietary, closed-source extension	Browser extension only, with no standalone app Some advanced features are gated behind the paid tier
Browser extension	Browser extension
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.