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lazysizes vs Underscore.js: who uses which

Underscore.js is on more sites: 1,226,291 against 932,496 for lazysizes, about 1.3 times as many. Here's how they compare across the websites we've indexed, and where each one does best.

Where each one is used

DomainlazysizesUnderscore.js
.com on .com472,701529,209
.de in Germany50,86573,489
.org on .org25,00355,195
.uk in the UK22,21434,026
.ru on .ru34,04419,026
.fr in France15,62936,310
.it in Italy14,57535,400
.net on .net22,75522,013

40,883 sites run both at once.

Questions

Which is more popular, lazysizes or Underscore.js?

Underscore.js is on more sites: 1,226,291 against 932,496 for lazysizes, about 1.3 times as many, across the sites StackGrep has indexed.

Do sites use lazysizes and Underscore.js together?

40,883 sites load both. That's often a switch in progress, or two teams picking different tools.

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