Top-level domain · 185 sites
What are websites on .io domains (tech start-ups) built with?
As of 2026-10-02, we read the home pages of 185 websites on .io domains (tech start-ups) among our popular sample: the most used CMS is Webflow (12%), the most used framework is React (33%) and the most used CDN or host is Cloudflare (49%).
Most used technologies
| Technology | Category | Sites | Share | vs all sites |
|---|---|---|---|---|
| Cloudflare | CDN | 90 | 49% | 1.5x |
| Google Tag Manager | Tag manager | 78 | 42% | 1.0x |
| React | JavaScript framework | 61 | 33% | 2.0x |
| Next.js | JavaScript framework | 55 | 30% | 2.2x |
| Tailwind CSS | UI library | 49 | 26% | 2.0x |
| jQuery | JavaScript library | 43 | 23% | 0.8x |
| Google Analytics | Analytics | 41 | 22% | 1.0x |
| Google Fonts | Fonts | 33 | 18% | 1.0x |
| jsDelivr | CDN | 28 | 15% | 1.9x |
| Nginx | Web server | 28 | 15% | 0.7x |
| PHP | Programming language | 26 | 14% | 0.6x |
| Cloudflare Web Analytics | Analytics | 23 | 12% | 0.9x |
| Vercel | Hosting / PaaS | 22 | 12% | 7.0x |
| Webflow | CMS | 22 | 12% | 5.8x |
| HubSpot | Marketing automation | 21 | 11% | 3.4x |
| WordPress | CMS | 21 | 11% | 0.7x |
| cdnjs | CDN | 17 | 9.2% | 1.1x |
| Google Hosted Libraries | CDN | 17 | 9.2% | 2.0x |
| Font Awesome | Fonts | 16 | 8.6% | 0.9x |
| Bootstrap | UI library | 15 | 8.1% | 0.9x |
| GSAP | JavaScript library | 15 | 8.1% | 3.7x |
| Swiper | JavaScript library | 13 | 7.0% | 1.0x |
| jQuery Migrate | JavaScript library | 12 | 6.5% | 0.9x |
| Yoast SEO | SEO | 12 | 6.5% | 0.9x |
| OneTrust | Cookie consent | 11 | 5.9% | 0.8x |
"vs all sites" compares the share here with the share among all 7,859 sites: 2.0x means twice as common.
Over-represented here
Technologies much more common on websites on .io domains (tech start-ups) than on average (at least 6 sites):
| Technology | Sites | Share | vs all sites |
|---|---|---|---|
| Sanity | 10 | 5.4% | 7.5x |
| Vercel | 22 | 12% | 7.0x |
| Webflow | 22 | 12% | 5.8x |
| HubSpot CMS | 7 | 3.8% | 4.4x |
| GSAP | 15 | 8.1% | 3.7x |
| HubSpot | 21 | 11% | 3.4x |
| LinkedIn Insight Tag | 6 | 3.2% | 3.0x |
| WP Rocket | 6 | 3.2% | 2.6x |
| Osano | 6 | 3.2% | 2.6x |
| Astro | 7 | 3.8% | 2.5x |
Most popular websites on .io domains (tech start-ups)
- sentry.io #41
- intercom.io #290
- wpguardian.io #308
- oxylabs.io #321
- itch.io #325
- pendo.io #385
- agora.io #406
- 0xrpc.io #591
- cardgames.io #663
- ssstik.io #712
- astrumu.io #897
- privacymanager.io #1,004
- nic.io #1,070
- shodan.io #1,083
- metamask.io #1,086
- customer.io #1,143
- trustindex.io #1,237
- split.io #1,245
- home-assistant.io #1,274
- snapcraft.io #1,296
- sslip.io #1,308
- aditude.io #1,379
- nexx360.io #1,381
- mediago.io #1,412
- redis.io #1,429
- huntress.io #1,435
- cloudx.io #1,467
- merkle.io #1,652
- guard.io #1,692
- nip.io #1,720
- azurecontainerapps.io #1,801
- pantheonsite.io #1,806
- gitbook.io #1,845
- ably.io #1,887
- omni-dex.io #1,896
- elevenlabs.io #2,020
- island.io #2,039
- piano.io #2,062
- connectad.io #2,094
- plausible.io #2,107
- complianz.io #2,121
- netbird.io #2,138
- missena.io #2,233
- jumpjump.io #2,317
- growthbook.io #2,322
- sanity.io #2,341
- termly.io #2,351
- bitdrift.io #2,357
- kandji.io #2,371
- greenhouse.io #2,422
- gohugo.io #2,473
- opensea.io #2,494
- fpjs.io #2,749
- ghcr.io #2,800
- kubernetes.io #2,857
- ussp.io #3,019
- gofile.io #3,028
- ves.io #3,031
- nownodes.io #3,133
- infura.io #3,136
- etherscan.io #3,144
- blastapi.io #3,165
- zeta-ai.io #3,272
- mevblocker.io #3,298
- bidmatic.io #3,311
- 5ch.io #3,416
- osf.io #3,419
- n8n.io #3,470
- lunalabs.io #3,673
- 1rpc.io #3,687
- airbridge.io #3,767
- cloudez.io #3,844
- smooch.io #3,853
- karte.io #3,869
- transcend.io #3,902
- meduza.io #3,964
- exodus.io #3,994
- datagrail.io #4,067
- pinklion.io #4,071
- smile.io #4,370
- quay.io #4,388
- apollo.io #4,442
- notvpn.io #4,525
- gravitational.io #4,583
- trezor.io #4,622
- digitalaudience.io #4,691
- coda.io #4,724
- prismic.io #4,785
- envoyer.io #4,854
- kaliscan.io #5,034
- kayzen.io #5,363
- jenkins.io #5,367
- mgread.io #5,476
- tpmn.io #5,506
- targetads.io #5,712
- qt.io #5,726
- stamped.io #5,737
- synthesia.io #5,838
- uakinogo.io #5,864
- adapty.io #6,110
The 100 most popular of 185 are listed; the number is the position in our popularity-ordered sample (1 = most popular).
FAQ
- What are websites on .io domains (tech start-ups) built with?
- As of 2026-10-02, we read the home pages of 185 websites on .io domains (tech start-ups) among our popular sample: the most used CMS is Webflow (12%), the most used framework is React (33%) and the most used CDN or host is Cloudflare (49%).
- Which technologies are most common on websites on .io domains (tech start-ups)?
- Cloudflare (49%), Google Tag Manager (42%), React (33%), Next.js (30%), Tailwind CSS (26%) and jQuery (23%) (share of the 185 sites analysed on 2026-10-02).
- What is typical for websites on .io domains (tech start-ups) compared with all sites?
- Sanity (7.5x as common as on average), Vercel (7.0x as common as on average), Webflow (5.8x as common as on average) and HubSpot CMS (4.4x as common as on average).
- Does .io mean the site is hosted in that country?
- No. A top-level domain says how the name is registered, not where the server is. The technologies are detected from the home page, wherever it is hosted.