CalcSpan vs MakeCalculator

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

CalcSpan compared with MakeCalculator
Detail	CalcSpan	MakeCalculator
What it does	Date, deadline and time calculators with visible assumptions and sources	Free calculators that show their working
Stage	Not given	Not given
Founded	Not given	Not given
Based in	US	Not given
Pricing model	Free	Free
Pricing	Not given	Not given
Key features	184 calculators across 53 categories Shows counting rules and assumptions with each result Local-first processing with no data sent to servers Holiday and weekend calendar selection Business day counting Date arithmetic (add or subtract days, weeks, months, years) Sleep cycle planner with NIH-based 80-100 minute cycles Time zone conversion with DST handling Save results as images or add to calendar Schengen visa 90/180 day rolling window auditing	Shows formulas and worked examples Runs in your browser No sign-up required 785 calculators and tools Works on phones, tablets and computers Data stays on your device Covers 54 subjects
What makes it different	Shows the source and counting rule beside every answer No sign-up or account required to use any calculator All inputs stay in your browser for privacy Comprehensive coverage across 53 life and work categories Higher-risk calculators include prompts to verify with professionals	Calculators show their working, not just the answer Results come with formula, steps and worked examples Your numbers never leave your browser Built from standard published formulas and tested
Community votes	0	0
DR (Domain Rating by Ahrefs)	Not checked yet no change since last check	Not checked yet no change since last check
Trust Flow (Majestic)	0	0
Citation Flow (Majestic)	0	0
Referring domains (Majestic)	0	0

4 details filled in for both companies.

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