Websites Powered by ef.js
204 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
250
500
750
1K
Apr 2018
May 2020
May 2022
Jun 2024
Jun 2026
Domains observed using ef.js in each month's HTTP Archive crawl,
Apr 2018 to Jun 2026 · peak 856 in Aug 2021. The tracked total above also
counts sites not re-crawled recently.
Core Web Vitals
LCP 1.4 s
INP 100 ms
CLS 0
TTFB 700 ms
Median site among 111 ef.js sites with Chrome UX data, p75 values, Jun 2026.
Top countries
Argentina
78
Colombia
39
United States
39
Mexico
38
Peru
38
Spain
36
Indonesia
35
Brazil
34
Sites using ef.js by audience country, Chrome UX Report.
Top sites by authority
9+
0% · 0 of 372 sites
8+
<1% · 1 of 7,677 sites
7+
<1% · 6 of 45,712 sites
6+
<1% · 17 of 110,136 sites
5+
<1% · 23 of 246,751 sites
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 | unicen.edu.ar | 7.35/10 | 23 | 184 | Jan 2019 |
| 4 | mdp.edu.ar | 7.02/10 | 22 | 6 | Aug 2018 |
| 5 | unne.edu.ar | 7.02/10 | 29 | 225 | Jan 2019 |
| 6 | untref.edu.ar | 7.02/10 | 150 | 410 | Apr 2025 |
| 7 | service.tas.gov.au | 6.96/10 | 770 | 1,531 | Oct 2025 |
| 8 | uncu.edu.ar | 6.82/10 | - | 1 | Aug 2018 |
| 9 | uncuyo.edu.ar | 6.75/10 | 620 | 1,165 | Jan 2025 |
| 10 | usal.edu.ar | 6.52/10 | 440 | 486 | Feb 2024 |
| 11 | unam.edu.ar | 6.50/10 | 17 | 161 | Aug 2018 |
| 12 | unt.edu.ar | 6.49/10 | 180 | 185 | Mar 2024 |
| 13 | educacion.gob.ar | 6.47/10 | - | - | Apr 2024 |
| 14 | unsa.edu.ar | 6.40/10 | 14 | 91 | Oct 2021 |
| 15 | unse.edu.ar | 6.30/10 | 55 | 135 | May 2022 |
| 16 | uner.edu.ar | 6.21/10 | 400 | 65 | Apr 2019 |
| 17 | colegiomilitar.mil.ar | 2.99/10 | - | - | Sep 2020 |
| 18 | efinance.com.br | 0.39/10 | - | - | Aug 2018 |
| 19 | iuv.edu.ar | 0.75/10 | - | - | Oct 2024 |
| 20 | jusentrerios.gov.ar | 3.88/10 | - | - | Aug 2018 |
| 21 | labiblia.in | 2.60/10 | - | - | Jan 2021 |
| 22 | larioja.edu.ar | 0.44/10 | - | - | Nov 2021 |
| 23 | siu.edu.ar | 5.78/10 | - | 7 | Aug 2018 |
| 24 | tivusat.tv | 4.55/10 | - | - | May 2024 |
| 25 | uader.edu.ar | 4.63/10 | - | - | Aug 2018 |
| 26 | unahur.edu.ar | 4.30/10 | - | - | May 2021 |
| 27 | unlar.edu.ar | 5.30/10 | 81 | 117 | Apr 2019 |
| 28 | yamcapitalhumano.com | 0.17/10 | - | - | Feb 2022 |
| 29 | agendaeletronica.com.br | - | - | - | Apr 2025 |
| 30 | agricolaespartillar.com.ar | - | - | - | Aug 2022 |
| 31 | berlineyecare.com | 0.10/10 | - | - | Jan 2024 |
| 32 | catamarca.edu.ar | 3.98/10 | - | - | Dec 2020 |
| 33 | cin.edu.ar | 5.51/10 | 60 | 23 | Dec 2021 |
| 34 | coopdarregueira.com.ar | 0.43/10 | - | - | Aug 2022 |
| 35 | dmvdealerschool.com | 0.40/10 | - | - | Apr 2022 |
| 36 | edwardfields.com | 1.98/10 | - | - | Sep 2022 |
| 37 | egefren.com.tr | 1.35/10 | - | - | Sep 2021 |
| 38 | emergeapp.net | 4.92/10 | - | - | Jul 2024 |
| 39 | escueladedealer.com | 0.11/10 | - | - | Mar 2024 |
| 40 | folkbibeln.it | 2.72/10 | - | - | Feb 2019 |
| 41 | friendline.org.au | 4.66/10 | - | - | Apr 2024 |
| 42 | fundacionmusicforall.org | 3.03/10 | - | - | Mar 2024 |
| 43 | geekradin.fr | 3.04/10 | - | - | Dec 2024 |
| 44 | goodcompanybooks.com | 1.06/10 | - | - | Jul 2024 |
| 45 | hristijanskipesni.mk | - | - | - | Aug 2025 |
| 46 | i-radio.co | 2.13/10 | - | - | Aug 2022 |
| 47 | inidep.edu.ar | 4.54/10 | - | - | Aug 2023 |
| 48 | iqrabelgium.be | 0.40/10 | - | - | Jun 2026 |
| 49 | jazzbounce.com | 0.42/10 | - | - | Mar 2026 |
| 50 | jusmisiones.gov.ar | 3.12/10 | - | - | Oct 2025 |
| 51 | laalianzacoop.com.ar | 0.27/10 | - | - | Aug 2022 |
| 52 | marineweb.com | 1.81/10 | - | - | Dec 2021 |
| 53 | migrun.tech | 3.47/10 | - | - | Mar 2026 |
| 54 | ohioemploymentfirst.org | 4.00/10 | - | - | Nov 2023 |
| 55 | pakval.com.ua | 0.36/10 | - | - | Apr 2019 |
| 56 | parket-land.be | 0.23/10 | - | - | Jun 2026 |
| 57 | puliafito.com | 0.10/10 | - | - | Aug 2022 |
| 58 | sciencellonline.com | 3.06/10 | - | - | Mar 2024 |
| 59 | siscoop.com.ar | 0.27/10 | - | - | Jun 2025 |
| 60 | stadionulnational.ro | 0.43/10 | - | - | Jul 2024 |
| 61 | tshirts-johannesburg.co.za | 0.22/10 | - | - | Mar 2025 |
| 62 | uccuyosl.edu.ar | 3.37/10 | - | - | Apr 2026 |
| 63 | undef.edu.ar | 4.69/10 | - | - | Mar 2024 |
| 64 | unisud.edu.ar | 1.43/10 | - | - | Apr 2026 |
| 65 | unla.edu.ar | 6.05/10 | 45 | 397 | Jan 2019 |
| 66 | unlam.edu.ar | 5.04/10 | 180 | 499 | May 2024 |
| 67 | unlu.edu.ar | 5.33/10 | 58 | 256 | Jan 2019 |
| 68 | unlz.edu.ar | 4.75/10 | - | - | Dec 2025 |
| 69 | unm.edu.ar | 4.69/10 | - | - | Jun 2020 |
| 70 | unnoba.edu.ar | 4.69/10 | - | - | Apr 2019 |
| 71 | unpa.edu.ar | 5.27/10 | 120 | 113 | Apr 2019 |
| 72 | unsanisidro.edu.ar | 1.05/10 | - | - | Aug 2022 |
| 73 | usi.edu.ar | 3.66/10 | - | - | Oct 2023 |
| 74 | zeppelinpm.ru | 1.40/10 | - | - | Jul 2020 |
| 75 | claimparts.com | 1.64/10 | - | - | Jan 2026 |
| 76 | ecatgeek.com | 2.88/10 | - | - | Oct 2025 |
| 77 | eternal-flame.org | 0.40/10 | - | - | May 2026 |
| 78 | johancreten.com | 0.80/10 | - | - | Apr 2024 |
| 79 | kobe-shinse.com | 0.10/10 | - | - | May 2026 |
| 80 | stevekeen.com | 0.83/10 | - | - | Apr 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) →