Websites Powered by ef.js
224 websites tracked using ef.js (JavaScript frameworks) · ef.js.org
ef.js is a JavaScript framework for building interactive web applications. Its official site is ef.js.org. PoweredBy tracks the websites that use ef.js across the public web; the tracked counts, adoption trend, and site list on this page are updated from our ongoing crawl of the javascript frameworks ecosystem.
Usage trend
Core Web Vitals
Median site among 123 ef.js sites with Chrome UX data, p75 values, Sep 2026.
Top countries
Argentina
73
Mexico
44
Colombia
39
United States
39
Spain
34
Peru
34
Brazil
31
Chile
28
Sites using ef.js by audience country, Chrome UX Report.
Usage by industry
| Industry | Share | Websites |
|---|---|---|
| Arts and entertainment | <0.01% | 2 |
| Education | <0.01% | 2 |
| News and media | <0.01% | 1 |
| Retail | <0.01% | 3 |
| Software and apps | <0.01% | 1 |
Share of each industry's websites with a detected stack that use ef.js; industries come from what sites declare in their own structured data.
Top sites by authority
The share of the web's most authoritative domains, by Open Page Rank tier, seen running ef.js in recent crawls. Only 372 domains worldwide score 9 or higher.
Websites using ef.js
| # | Domain | Open Page RankOPR | Est. monthly visits (US)Visits (US) | Keywords | First seen |
|---|---|---|---|---|---|
| 1 | uba.ar | 8.21/10 | 670 | 586 | May 2021 |
| 2 | unr.edu.ar | 7.44/10 | 770 | 966 | Aug 2018 |
| 3 | unsam.edu.ar | 7.37/10 | 160 | 713 | Aug 2018 |
| 4 | unicen.edu.ar | 7.35/10 | 23 | 184 | Jan 2019 |
| 5 | mdp.edu.ar | 7.02/10 | 22 | 6 | Aug 2018 |
| 6 | unq.edu.ar | 7.02/10 | 800 | 919 | Sep 2025 |
| 7 | unne.edu.ar | 7.02/10 | 29 | 225 | Jan 2019 |
| 8 | untref.edu.ar | 7.02/10 | 150 | 410 | Apr 2025 |
| 9 | service.tas.gov.au | 6.96/10 | 770 | 1,531 | Oct 2025 |
| 10 | uncu.edu.ar | 6.82/10 | - | 1 | Aug 2018 |
| 11 | unam.edu.ar | 6.50/10 | 17 | 161 | Aug 2018 |
| 12 | educacion.gob.ar | 6.47/10 | - | - | Apr 2024 |
| 13 | unsa.edu.ar | 6.40/10 | 14 | 91 | Oct 2021 |
| 14 | unse.edu.ar | 6.30/10 | 55 | 135 | May 2022 |
| 15 | unsl.edu.ar | 6.29/10 | 24 | 135 | May 2023 |
| 16 | uner.edu.ar | 6.21/10 | 400 | 65 | Apr 2019 |
| 17 | unla.edu.ar | 6.05/10 | 45 | 397 | Jan 2019 |
| 18 | siu.edu.ar | 5.78/10 | - | 7 | Aug 2018 |
| 19 | cin.edu.ar | 5.51/10 | 60 | 23 | Dec 2021 |
| 20 | unlu.edu.ar | 5.33/10 | 58 | 256 | Jan 2019 |
| 21 | unlar.edu.ar | 5.30/10 | 81 | 116 | Apr 2019 |
| 22 | unpa.edu.ar | 5.27/10 | 120 | 108 | Apr 2019 |
| 23 | pixelfederation.com | 5.12/10 | - | - | Sep 2026 |
| 24 | emergeapp.net | 4.92/10 | - | - | Jul 2024 |
| 25 | unlz.edu.ar | 4.75/10 | - | - | Dec 2025 |
| 26 | undef.edu.ar | 4.69/10 | - | - | Mar 2024 |
| 27 | unnoba.edu.ar | 4.69/10 | - | - | Apr 2019 |
| 28 | dejavu-net.jp | 4.69/10 | - | - | Jun 2025 |
| 29 | friendline.org.au | 4.66/10 | - | - | Apr 2024 |
| 30 | uader.edu.ar | 4.63/10 | - | - | Aug 2018 |
| 31 | tivusat.tv | 4.55/10 | - | - | May 2024 |
| 32 | inidep.edu.ar | 4.54/10 | - | - | Aug 2023 |
| 33 | unahur.edu.ar | 4.30/10 | - | - | May 2021 |
| 34 | rectus.co.jp | 4.07/10 | - | - | Sep 2026 |
| 35 | ohioemploymentfirst.org | 4.00/10 | - | - | Nov 2023 |
| 36 | jusentrerios.gov.ar | 3.88/10 | - | - | Aug 2018 |
| 37 | untdf.edu.ar | 3.86/10 | - | - | Sep 2026 |
| 38 | usi.edu.ar | 3.66/10 | - | - | Oct 2023 |
| 39 | migrun.tech | 3.47/10 | - | - | Mar 2026 |
| 40 | mtl.co.jp | 3.35/10 | - | - | Aug 2026 |
| 41 | elitedivat.hu | 3.22/10 | - | - | Oct 2026 |
| 42 | jusmisiones.gov.ar | 3.12/10 | - | - | Oct 2025 |
| 43 | geekradin.fr | 3.04/10 | - | - | Dec 2024 |
| 44 | fundacionmusicforall.org | 3.03/10 | - | - | Mar 2024 |
| 45 | colegiomilitar.mil.ar | 2.99/10 | - | - | Sep 2020 |
| 46 | folkbibeln.it | 2.72/10 | - | - | Feb 2019 |
| 47 | labiblia.in | 2.60/10 | - | - | Jan 2021 |
| 48 | i-radio.co | 2.13/10 | - | - | Aug 2022 |
| 49 | supmeaauto.com | 2.05/10 | - | - | Sep 2026 |
| 50 | dataflik.com | 1.83/10 | - | - | Aug 2026 |
| 51 | marineweb.com | 1.81/10 | - | - | Dec 2021 |
| 52 | hart-metale.pl | 1.62/10 | - | - | Aug 2026 |
| 53 | neo.com.lb | 1.52/10 | - | - | Oct 2026 |
| 54 | unisud.edu.ar | 1.43/10 | - | - | Apr 2026 |
| 55 | zeppelinpm.ru | 1.40/10 | - | - | Jul 2020 |
| 56 | egefren.com.tr | 1.35/10 | - | - | Sep 2021 |
| 57 | goodcompanybooks.com | 1.06/10 | - | - | Jul 2024 |
| 58 | unsanisidro.edu.ar | 1.05/10 | - | - | Aug 2022 |
| 59 | clnonwoven.com | 1.01/10 | - | - | Sep 2026 |
| 60 | elizabethmoirschool.com | 0.96/10 | - | - | Oct 2026 |
| 61 | equantu.com | 0.90/10 | - | - | Sep 2026 |
| 62 | johancreten.com | 0.80/10 | - | - | Apr 2024 |
| 63 | iuv.edu.ar | 0.75/10 | - | - | Oct 2024 |
| 64 | larioja.edu.ar | 0.44/10 | - | - | Nov 2021 |
| 65 | stadionulnational.ro | 0.43/10 | - | - | Jul 2024 |
| 66 | coopdarregueira.com.ar | 0.43/10 | - | - | Aug 2022 |
| 67 | dmvdealerschool.com | 0.40/10 | - | - | Apr 2022 |
| 68 | allurekitchencabinet.com | 0.40/10 | 160 | 196 | Oct 2026 |
| 69 | iqrabelgium.be | 0.40/10 | - | - | Jun 2026 |
| 70 | efinance.com.br | 0.39/10 | - | - | Aug 2018 |
| 71 | pakval.com.ua | 0.36/10 | - | - | Apr 2019 |
| 72 | ctechipower.com | 0.35/10 | - | - | Oct 2026 |
| 73 | komotashi.com | 0.32/10 | - | - | Aug 2026 |
| 74 | fehonda.com | 0.30/10 | - | - | Sep 2026 |
| 75 | siscoop.com.ar | 0.27/10 | - | - | Jun 2025 |
| 76 | laalianzacoop.com.ar | 0.27/10 | - | - | Aug 2022 |
| 77 | tyhardwareindustrial.com | 0.25/10 | - | - | Aug 2026 |
| 78 | parket-land.be | 0.23/10 | - | - | Jun 2026 |
| 79 | tshirts-johannesburg.co.za | 0.22/10 | - | - | Mar 2025 |
| 80 | yamcapitalhumano.com | 0.17/10 | - | - | Feb 2022 |
| 81 | puntocomsa.com | 0.14/10 | - | - | Aug 2025 |
| 82 | beltwin.com | 0.12/10 | 72 | 103 | Aug 2026 |
| 83 | shengdacom.com | 0.11/10 | - | - | Sep 2026 |
| 84 | puliafito.com | 0.10/10 | - | - | Aug 2022 |
| 85 | starline-global.com | 0.10/10 | - | - | Oct 2026 |
| 86 | agricolaespartillar.com.ar | - | - | - | Aug 2022 |
| 87 | georgewindowdoor.com | - | - | - | Oct 2026 |
| 88 | hristijanskipesni.mk | - | - | - | Aug 2025 |
| 89 | airmaxenerji.com.tr | - | - | - | Sep 2026 |
| 90 | companionranked.com | - | - | - | Oct 2026 |
| 91 | companiontested.com | - | - | - | Oct 2026 |
| 92 | landuntool.com | - | - | - | Oct 2026 |
| 93 | theaigflist.com | - | - | - | Sep 2026 |
Open Page Rank is the domain's authority score (0 to 10, from the open web link graph); the list is ordered by it and covers sites seen in recent crawls. Visits and keywords are estimated US organic search figures.
Download top 10,000 as CSV (zip) →
Columns: domain, Open Page Rank, first seen, last seen, industry (from the site's own structured data, blank when none).