
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.

Linode
DigitalOcean
Microsoft Azure
Amazon EC2
Vultr
Bluehost
Google Compute Engine
OpenStack software controls large pools of compute, storage, and networking resources throughout a datacenter, managed through a dashboard or via the OpenStack API.

Which is more popular?
Based on our record, Apollo.io seems to be a lot more popular than OpenStack. While we know about 69 links to Apollo.io, we've tracked only 2 mentions of OpenStack.
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | apollo.io | openstack.org |
| 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
OpenStack is particularly recommended for large enterprises, organizations with skilled IT teams, academic institutions, and service providers that need a highly customizable and scalable cloud solution. It's also a great fit for entities with specific compliance requirements or those that need to run a private cloud with tailored configurations.
Walkthroughs and reviews on video.
Free software to find email addresses - apollo.io review
More videos
OpenStack Summit Primer, The Who, What, Why and How of OpenStack
More videos
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Apollo.io and OpenStack. For example, how are they different and which one is better?
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...
OpenStack is a cloud framework. It provides users and enterprises with horizontal scale infrastructure. Its tools allow you to compute, store and share data and resources. It also provides self-service administration...
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
In my first post, I looked into what is OpenStack and how, if done right, can be quite a powerful ally in our cloud deployment strategies. In this post, I want to start looking at how we can create an application to learn the basics and... - Source: dev.to / over 5 years ago
While searching for solutions and documentation on the various problems I've come across, I would often see references to OpenStack and it got my curiosity going. What is OpenStack? What services does it offer and who owns it? How do I... - Source: dev.to / over 5 years ago
When comparing Apollo.io and OpenStack, you can also consider the following products.

ZoomInfo is a B2B database providing detailed business information on people and companies.
Compare ZoomInfo to Apollo.io or OpenStack:

We make it simple to develop, deploy, and scale cloud infrastructure at the best price-to-performance ratio in the market.
Compare Linode to Apollo.io or OpenStack:


Simplifying cloud hosting. Deploy an SSD cloud server in 55 seconds.
Compare DigitalOcean to Apollo.io or OpenStack:

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

Windows Azure and SQL Azure enable you to build, host and scale applications in Microsoft datacenters.
Compare Microsoft Azure to Apollo.io or OpenStack: