As of October 12, 2026, Apollo IO is used by 18,530 websites in the TechLeads index: 0.42% of all Marketing automation detections, the 29th most-used of 524 Marketing automation technologies.
Quoting these numbers? Credit TechLeads with a link to this page.
Citation
TechLeads. "Apollo IO Customers and Market Share." Data as of October 12, 2026. https://techleads.fyi/technology/apollo-io/market-shareHTML link
<a href="https://techleads.fyi/technology/apollo-io/market-share">Apollo IO market share (TechLeads data)</a>Websites using each technology in the TechLeads index, and its share of all Marketing automation detections.
| # | Technology | Websites | Share |
|---|---|---|---|
| 1 | MailChimp | 823,434 | 18.5% |
| 2 | HubSpot | 729,580 | 16.4% |
| 3 | Klaviyo | 383,142 | 8.6% |
| 4 | Social Miner | 230,560 | 5.2% |
| 5 | MailChimp for WordPress | 227,227 | 5.1% |
| 6 | Sendinblue | 190,955 | 4.3% |
| 7 | HighLevel |
Based on country-code domains (such as .de or .co.uk); websites on .com and other generic domains are not assigned a country.
See all 18,530 websites using Apollo IO or download the full list as a CSV for $29.
TechLeads scans public websites and detects Apollo IO from signals in the page HTML, scripts, cookies, HTTP headers and DNS records. Market share is Apollo IO's website count divided by the website counts of all Marketing automation technologies we track; a site using two Marketing automation tools counts for both. Counts were last refreshed on October 12, 2026 and update daily.
| 157,086 |
| 3.5% |
| 8 | ActiveCampaign | 131,787 | 3.0% |
| 9 | OneSignal | 129,498 | 2.9% |
| 10 | Salesforce Marketing Cloud Account Engagement | 124,488 | 2.8% |
| 11 | Hubspot Forms | 114,235 | 2.6% |
| 12 | MailerLite | 90,285 | 2.0% |
| 13 | Adobe Analytics | 85,355 | 1.9% |
| 14 | Tidio | 70,606 | 1.6% |
| 15 | PushOwl | 61,344 | 1.4% |
| 16 | Omnisend | 56,410 | 1.3% |
| 17 | Constant Contact | 49,253 | 1.1% |
| 18 | RD Station | 41,988 | 0.95% |
| 19 | Mailmunch | 25,710 | 0.58% |
| 20 | Cloud Technologies | 25,134 | 0.57% |
| 21 | Apollo IO | 18,530 | 0.42% |
Rows link to each competitor's market share page where one exists. The table lists the 21 most-used technologies; ranks are by website count.