Skip to main content

Built by makers, shipped in public

Sign in

CalcSpan vs CalcBloc

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 CalcBloc
DetailCalcSpan logo CalcSpanCalcBloc logo CalcBloc
What it doesDate, deadline and time calculators with visible assumptions and sources Free source-checked paycheck and tax calculators with every rate linked to official sources
StageNot given Not given
FoundedNot given Not given
Based inUS IN
Pricing modelFree Free
PricingNot given The calculators are free to use and do not require an account.
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
  • Paycheck and income tax calculators for US and 12 other countries
  • Every rate linked to official tax agencies
  • Calculations tested against official worked examples
  • Source documentation with retrieval dates for every figure
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
  • Every rate is sourced from official tax agencies with links to original documents
  • All figures are dated and checked for accuracy against official methods
  • Transparent about gaps where data is not yet verified
  • Covers 15 countries with a unified approach to transparency
  • Plain English explanations alongside all calculators
Community votes00
DR (Domain Rating by Ahrefs)Not checked yet no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)00
Citation Flow (Majestic)00
Referring domains (Majestic)00

5 details filled in for both companies.

More alternatives to CalcSpan More alternatives to CalcBloc

Ask us