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jQuery vs Underscore.js: who uses which

jQuery is on more sites: 19,504,289 against 1,226,291 for Underscore.js, about 15.9 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

DomainjQueryUnderscore.js
.com on .com8,335,629529,209
.de in Germany1,246,64573,489
.org on .org772,50955,195
.ru on .ru605,07819,026
.uk in the UK500,80434,026
.fr in France480,39136,310
.net on .net487,09422,013
.it in Italy431,64435,400

1,218,563 sites run both at once.

Questions

Which is more popular, jQuery or Underscore.js?

jQuery is on more sites: 19,504,289 against 1,226,291 for Underscore.js, about 15.9 times as many, across the sites StackGrep has indexed.

Do sites use jQuery and Underscore.js together?

1,218,563 sites load both. That's often a switch in progress, or two teams picking different tools.

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