
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.

Springer Link
Emerald Insight
ProQuest
Sage Journals
Loc.gov
IntechOpen
Asce Library
ScienceDirect provides subscription-based access to a large database of scientific and medical...

Which is more popular?
Based on our record, Apollo.io should be more popular than ScienceDirect. 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 | sciencedirect.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
No analysis of ScienceDirect yet.
Walkthroughs and reviews on video.
Free software to find email addresses - apollo.io review
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How often each product is chosen within a category, 0–100% relative to the other.


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External articles and on-site reviews we used to compare the two products.


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...
Apollo is a full sales engagement platform — sequences, email tracking, dialer, and a contact database. Their strength is email addresses, not phone numbers. Phone number coverage exists but it's thinner than...
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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 / 6 months ago
You can research some more in those two sites (especially in sciencedirect.com, you can filter by open studies if you are broke like me). Source: over 3 years ago
That's incorrect. You also need to get some better sources. EPA.gov, the ICCT report, and sciencedirect.com are highly political institutions. Source: over 3 years ago
First of all, sciencedirect.com is not a peer reviewed science site. it gets a 2 out of 4 stars when rated by actual scientists. Source: about 4 years ago
When comparing Apollo.io and ScienceDirect, you can also consider the following products.

ZoomInfo is a B2B database providing detailed business information on people and companies.
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Springer Link is a website offering access to millions of articles, research papers, books, and journals to researchers and students.
Compare Springer Link to Apollo.io or ScienceDirect:


Emerald Insight is a website that offers you thousands of books, articles, journals, and research papers on virtually all subjects from physical sciences such as physics and chemistry, to life sciences such as botany and zoology.
Compare Emerald Insight to Apollo.io or ScienceDirect:

Find all the email addresses related to a domain
Compare Hunter.io to Apollo.io or ScienceDirect:

ProQuest is a website that serves as an online educational hub where you can get eBooks, journals, research papers, articles, and even audios, videos, historical news, and magazines on any topic, subject, or fields such as physical sciences, health …
Compare ProQuest to Apollo.io or ScienceDirect: