ReactionTests vs JustTools

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

ReactionTests compared with JustTools
Detail	ReactionTests	JustTools
What it does	Test your visual reaction time for free	Free online tools for images, PDFs, text, developers and everyday tasks that run in your browser
Stage	Not given	Startup
Founded	Not given	2026
Based in	Not given	IN
Pricing model	Free	Not given
Pricing	Not given	Not given
Key features	Five-round visual reaction test with millisecond timing Seven-round sound reaction time test Local result history with up to 300 sessions stored Consistency measurement showing standard deviation of scores Download score card as image Sound calibration for personal offset adjustment Reference data from published research studies	Image compression and resizing PDF merge, split and conversion Word and character counter with readability analysis JSON formatter and validator QR code and barcode generation Password generator and strength checker Loan EMI calculator with prepayment simulation CSS gradient, shadow and animation generators DNS lookup and propagation checker Resume builder and ATS checker
What makes it different	No account or login required to use the test Results stored locally in browser for privacy Compare full sessions to understand consistency, not just fastest round Research-backed reference data from laboratory studies	Completely free with no sign-up, trials, watermarks or paid features 212 tools across 16 categories covering images, PDFs, text, code and everyday tasks Transparent about what data is sent and where
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)	3 no change since last check	15 no change since last check
Trust Flow (Majestic)	0	8
Citation Flow (Majestic)	11	24
Referring domains (Majestic)	1	18

3 details filled in for both companies.

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