Websites Powered by Customer.io
3,284 websites tracked using Customer.io (Marketing automation) · customer.io
Customer.io is a marketing automation platform for campaigns and lead nurturing. Its official site is customer.io. PoweredBy tracks the websites that use Customer.io across the public web; the tracked counts, adoption trend, and site list on this page are updated from our ongoing crawl of the marketing automation ecosystem.
Usage trend
500
1K
1.5K
Oct 2021
Jan 2023
Apr 2024
Jun 2025
Sep 2026
Domains observed using Customer.io in each month's HTTP Archive crawl,
Oct 2021 to Sep 2026 · peak 1,161 in May 2025. The tracked total above also
counts sites not re-crawled recently.
Core Web Vitals
LCP 2.4 s
INP 125 ms
CLS 0
TTFB 800 ms
Median site among 1,465 Customer.io sites with Chrome UX data, p75 values, Sep 2026.
Top countries
United States
868
India
564
United Kingdom
489
Canada
467
Germany
405
France
370
Australia
363
Spain
346
Sites using Customer.io by audience country, Chrome UX Report.
Usage by industry
| Industry | Share | Websites |
|---|---|---|
| Software and apps | 0.06% | 73 |
| Finance and insurance | 0.03% | 5 |
| Education | 0.01% | 7 |
| Non-profit and religious | 0.01% | 1 |
| Retail | <0.01% | 24 |
| Sports and fitness | <0.01% | 1 |
| Healthcare | <0.01% | 6 |
| News and media | <0.01% | 2 |
| Beauty and wellness | <0.01% | 1 |
| Automotive | <0.01% | 2 |
| Real estate | <0.01% | 2 |
| Travel and hospitality | <0.01% | 2 |
Share of each industry's websites with a detected stack that use Customer.io; industries come from what sites declare in their own structured data.
Top sites by authority
9+
<1% · 1 of 372 sites
8+
<1% · 17 of 7,677 sites
7+
<1% · 71 of 45,712 sites
6+
<1% · 122 of 110,136 sites
5+
<1% · 186 of 246,751 sites
The share of the web's most authoritative domains, by Open Page Rank tier, seen running Customer.io in recent crawls. Only 372 domains worldwide score 9 or higher.
Websites using Customer.io
| # | Domain | Open Page RankOPR | Est. monthly visits (US)Visits (US) | Keywords | First seen |
|---|---|---|---|---|---|
| 1 | vercel.app | 9.05/10 | - | - | Nov 2024 |
| 2 | azurewebsites.net | 8.87/10 | - | - | Sep 2024 |
| 3 | herokuapp.com | 8.74/10 | - | - | Dec 2022 |
| 4 | utah.edu | 8.74/10 | 474,500 | 10,126 | Jul 2025 |
| 5 | trustedsite.com | 8.69/10 | 1,600 | 572 | Nov 2021 |
| 6 | weglot.com | 8.68/10 | 5,700 | 3,037 | Mar 2025 |
| 7 | breezy.hr | 8.30/10 | 18,900 | 9,878 | Jul 2022 |
| 8 | nm.gov | 8.29/10 | 34,700 | 4,741 | Oct 2022 |
| 9 | firebaseapp.com | 8.27/10 | - | - | Aug 2022 |
| 10 | apollo.io | 8.25/10 | 49,000 | 5,651 | Aug 2022 |
| 11 | welcometothejungle.com | 8.23/10 | 35,600 | 14,382 | Oct 2023 |
| 12 | insead.edu | 8.20/10 | 9,800 | 8,169 | Jul 2022 |
| 13 | zurb.com | 8.06/10 | 790 | 348 | Sep 2026 |
| 14 | clearbit.com | 8.06/10 | 4,100 | 880 | Nov 2021 |
| 15 | komi.io | 8.04/10 | 270 | 289 | Jan 2022 |
| 16 | opendns.com | 8.04/10 | 12,500 | 7,538 | Nov 2021 |
| 17 | ie.edu | 8.01/10 | 44,700 | 12,247 | Oct 2024 |
| 18 | getshogun.com | 7.99/10 | 8,700 | 2,390 | Jun 2024 |
| 19 | rescuetime.com | 7.97/10 | 3,800 | 4,643 | Nov 2021 |
| 20 | london.edu | 7.92/10 | 11,800 | 8,303 | Oct 2024 |
| 21 | senja.io | 7.89/10 | 520 | 497 | Dec 2025 |
| 22 | inc42.com | 7.88/10 | 5,300 | 9,855 | Apr 2026 |
| 23 | popupsmart.com | 7.79/10 | 5,300 | 5,027 | May 2023 |
| 24 | mex.com | 7.79/10 | - | - | Dec 2021 |
| 25 | streamlabs.com | 7.77/10 | 132,400 | 25,926 | May 2022 |
| 26 | esade.edu | 7.72/10 | 34,500 | 8,184 | Aug 2024 |
| 27 | safetyculture.com | 7.71/10 | 225,100 | 51,320 | Jun 2026 |
| 28 | hvg.hu | 7.70/10 | 5,000 | 2,782 | Jul 2024 |
| 29 | coderabbit.ai | 7.61/10 | 1,800 | 3,498 | Feb 2026 |
| 30 | puck.news | 7.59/10 | 37,700 | 26,660 | Nov 2021 |
| 31 | bigstockphoto.com | 7.56/10 | 3,700 | 5,081 | Nov 2021 |
| 32 | softr.io | 7.56/10 | 35,200 | 10,948 | Nov 2021 |
| 33 | getastra.com | 7.51/10 | 5,000 | 3,474 | Nov 2023 |
| 34 | landr.com | 7.50/10 | 13,000 | 5,894 | Nov 2021 |
| 35 | homelight.com | 7.45/10 | 134,700 | 77,338 | Sep 2026 |
| 36 | sharecare.com | 7.44/10 | 89,200 | 264,096 | May 2022 |
| 37 | contentstudio.io | 7.44/10 | 40,000 | 27,835 | Nov 2021 |
| 38 | gitguardian.com | 7.43/10 | 320 | 463 | Nov 2021 |
| 39 | yousty.ch | 7.41/10 | 8 | 67 | Feb 2022 |
| 40 | roboflow.com | 7.40/10 | 2,100 | 3,628 | Aug 2023 |
| 41 | championhealth.co.uk | 7.37/10 | - | 3 | Mar 2024 |
| 42 | hellobonsai.com | 7.36/10 | 57,200 | 27,697 | Nov 2021 |
| 43 | riverside.com | 7.35/10 | 255,200 | 103,875 | Aug 2025 |
| 44 | flysas.com | 7.35/10 | 83,100 | 27,560 | Jan 2026 |
| 45 | kiwi.com | 7.33/10 | 191,900 | 126,604 | Mar 2026 |
| 46 | hult.edu | 7.32/10 | 15,500 | 5,157 | Feb 2024 |
| 47 | cookpolitical.com | 7.28/10 | 37,500 | 14,048 | Aug 2023 |
| 48 | pricewise.nl | 7.27/10 | 250 | 224 | Apr 2024 |
| 49 | resellerclub.com | 7.23/10 | 2,300 | 1,797 | Oct 2021 |
| 50 | indy.fr | 7.22/10 | 150 | 345 | Jul 2023 |
| 51 | hex.tech | 7.15/10 | 22,800 | 2,880 | May 2023 |
| 52 | musixmatch.com | 7.15/10 | 4,346,800 | 1,028,592 | Jan 2023 |
| 53 | testgorilla.com | 7.14/10 | 16,500 | 18,412 | Dec 2025 |
| 54 | claimsjournal.com | 7.14/10 | 8,800 | 5,958 | Oct 2021 |
| 55 | wordable.io | 7.11/10 | 25,000 | 5,948 | Aug 2022 |
| 56 | justworks.com | 7.10/10 | 55,500 | 15,825 | Apr 2024 |
| 57 | upmetrics.co | 7.09/10 | 7,200 | 10,150 | Jan 2024 |
| 58 | manypixels.co | 7.09/10 | 23,600 | 15,139 | Dec 2023 |
| 59 | flutterwave.com | 7.07/10 | 4,800 | 5,431 | Aug 2023 |
| 60 | deepdyve.com | 7.07/10 | 580 | 1,400 | Apr 2023 |
| 61 | salehoo.com | 7.04/10 | 10,300 | 5,539 | Nov 2021 |
| 62 | ueni.com | 7.02/10 | 3,800 | 726 | Nov 2021 |
| 63 | taxdome.com | 7.02/10 | 13,000 | 3,037 | Dec 2024 |
| 64 | gempages.net | 7.02/10 | 8,300 | 5,607 | May 2022 |
| 65 | cmscritic.com | 7.02/10 | 990 | 1,108 | Nov 2021 |
| 66 | e2b.dev | 7.02/10 | 480 | 951 | Sep 2026 |
| 67 | tealhq.com | 7.02/10 | 325,300 | 239,625 | Sep 2023 |
| 68 | enhancv.com | 7.02/10 | 99,300 | 47,259 | Aug 2022 |
| 69 | wecandoo.fr | 7.02/10 | 81 | 288 | Nov 2023 |
| 70 | smodin.io | 7.02/10 | 9,400 | 8,326 | Jul 2024 |
| 71 | kittl.com | 7.00/10 | 90,400 | 51,575 | Aug 2022 |
| 72 | xoxoday.com | 6.98/10 | 270 | 553 | Dec 2023 |
| 73 | slant.co | 6.98/10 | 5,600 | 15,423 | Oct 2021 |
| 74 | phantombuster.com | 6.94/10 | 7,700 | 5,341 | Jul 2026 |
| 75 | knock.app | 6.89/10 | 2,000 | 363 | Aug 2022 |
| 76 | telecomtv.com | 6.89/10 | 3,800 | 4,396 | Oct 2022 |
| 77 | wyzant.com | 6.89/10 | 333,000 | 177,293 | Nov 2021 |
| 78 | rezi.ai | 6.89/10 | 39,800 | 19,844 | Nov 2023 |
| 79 | mastersportal.com | 6.86/10 | 124,500 | 66,532 | Jul 2023 |
| 80 | trend.io | 6.84/10 | 3,700 | 1,099 | Apr 2022 |
| 81 | eatapp.co | 6.83/10 | 3,100 | 1,992 | Apr 2023 |
| 82 | submagic.co | 6.82/10 | 6,400 | 5,743 | Jul 2023 |
| 83 | archbee.com | 6.81/10 | 3,100 | 1,739 | Feb 2024 |
| 84 | yurplan.com | 6.76/10 | 19 | 24 | Jul 2023 |
| 85 | sunsama.com | 6.75/10 | 6,800 | 3,612 | Oct 2022 |
| 86 | lineups.com | 6.74/10 | 356,200 | 72,698 | Sep 2026 |
| 87 | kenhub.com | 6.73/10 | 2,573,300 | 298,672 | Mar 2022 |
| 88 | browse.ai | 6.69/10 | 2,200 | 2,702 | Aug 2024 |
| 89 | ebaconline.com.br | 6.65/10 | 220 | 479 | Jan 2023 |
| 90 | helloaudio.fm | 6.64/10 | 1,300 | 1,321 | Feb 2025 |
| 91 | ejewishphilanthropy.com | 6.64/10 | 10,500 | 11,423 | Apr 2025 |
| 92 | anychart.com | 6.61/10 | 2,600 | 1,221 | Oct 2021 |
| 93 | paperspace.com | 6.61/10 | 940 | 1,188 | Oct 2021 |
| 94 | aspireapp.com | 6.60/10 | 6,300 | 6,962 | Feb 2023 |
| 95 | replug.io | 6.60/10 | 4,400 | 3,106 | Nov 2021 |
| 96 | donweb.com | 6.55/10 | 200 | 173 | Nov 2021 |
| 97 | cohostpodcasting.com | 6.55/10 | 1,600 | 820 | Aug 2022 |
| 98 | growsurf.com | 6.55/10 | 1,800 | 1,614 | Jan 2022 |
| 99 | caser.es | 6.54/10 | 600 | 978 | Mar 2023 |
| 100 | scraperapi.com | 6.40/10 | 28,900 | 2,245 | Jul 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).
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