
ZoomInfo
Lusha
Hunter.io
Instantly.ai
lemlist
Clearbit
Snov.io
Apollo’s predictive prospecting, sales engagement, and actionable analytics help the teams to reach its full revenue potential.

UserTesting.com
UserZoom
Hotjar
Lookback
Userbrain
Validately
Maze
A powerful tool which enables user testing on prototypes, wireframes and websites.

Which is more popular?
Based on our record, Apollo.io seems to be more popular. It has been mentioned 69 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | apollo.io | loop11.com |
| Pricing | — | |
| Company | Startup from the United States | — |
| Listed in |
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Loop11 is recommended for UX designers, researchers, product managers, and digital marketers who need to conduct comprehensive usability testing. It’s suitable for teams that require both qualitative and quantitative data to enhance user experiences across web and mobile platforms. Companies and individuals seeking to improve their product design and usability through consistent user feedback will find Loop11 especially beneficial.
Walkthroughs and reviews on video.
Free software to find email addresses - apollo.io review
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Usability Tools Loop11 Exercise
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How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Apollo.io and Loop11. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Apollo documents zero-credit People API Search for eligible accounts. It returns candidate information without email or phone values. People Enrichment uses different rules and can charge for returned data. Waterfall...
The right Apollo alternative fixes the part of Apollo that costs you meetings. Bad data calls for a better database, and a missing channel calls for a specialist tool next to Apollo.
What is the best AI prospecting tool for B2B sales in 2026? The best tool depends on your team's specific situation. toflow.ai is a strong fit for multi-channel outreach across email, LinkedIn, and WhatsApp, and is...
Loop11 does not provide a pool of participants, therefore you’ll have to issue invites to your own users to receive results for your study. UserZoom has a user base of more than 120 million testers.
Recommendations tracked on public social media and blogs since March 2021.


Personal email domains destroy this. Clearbit's Enrichment API returns a null company when it hits gmail.com. Apollo routes personal domains straight to a consumer bucket and skips B2B fields entirely. Even PDL's /person/enrich endpoint... - Source: dev.to / 6 months ago
A few things worth flagging: PDL beats Clearbit's historical rates for US and Western European companies, but drops to ~52% match rate for Japan and South Korea specifically. Apollo underperforms on raw company matching but returns... - Source: dev.to / 6 months ago
One thing comparison guides consistently get wrong: Clay is not an enrichment API. It's a waterfall orchestration tool that calls People Data Labs, Apollo, Clearbit, and others in sequence for you. It's useful, but it adds 2–8 seconds of... - Source: dev.to / 7 months ago
Tracking Loop11 since Mar 2021.
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Test, measure, and monitor UX with our cost-effective all-in-one platform. UserZoom is a cloud-based solution for online usability testing.
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Find all the email addresses related to a domain
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The #1 Leader in Heatmaps, Recordings, Surveys & More. Sign up for a 15-day free trial and start learning from real user behavior today!
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