
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.

Auth0
Clerk
Keycloak
AuthKit
PropelAuth
Hanko
ZITADEL
Open-source Auth0/Clerk Alternative
Which is more popular?
Based on our record, Apollo.io seems to be a lot more popular than Stack Auth. While we know about 69 links to Apollo.io, we've tracked only 4 mentions of Stack Auth.
Website, pricing, platforms and company facts side by side.
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| Website | apollo.io | stack-auth.com |
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| Company | Startup from the United States | — |
| Listed in |
What each product offers, as listed by its team.


Possible disadvantages
No features have been listed yet.
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 Stack Auth yet.
Walkthroughs and reviews on video.
Free software to find email addresses - apollo.io review
More videos
W18D3 C3: Full Stack Auth Review: User/Computer Order & Developer Build Order
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Apollo.io and Stack Auth. 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...
We have no reviews of Stack Auth yet. Be the first one to post
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
Five minutes. That's how long Stack Auth takes to set up. - Source: dev.to / 12 months ago
Stack Auth (S24) | San Francisco, CA | Full-time Hiring founding & design engineers! We're building the customer platform for developers — think of a single service that does auth, payments, analytics, marketing emails, and so much more.... - Source: Hacker News / about 1 year ago
StackAuth is an open-source authentication and user management platform designed to integrate seamlessly into Next.js projects. Its combination of frontend/backend APIs and pre-built UI components dramatically simplifies the integration... - Source: dev.to / almost 2 years ago
When comparing Apollo.io and Stack Auth, 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 Stack Auth:

Auth0 is a program for people to get authentication and authorization services for their own business use.
Compare Auth0 to Apollo.io or Stack Auth:


Clerk.io, the artificial intelligence for e-commerce that knows your customers interests.
Compare Clerk to Apollo.io or Stack Auth:

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

Open Source Identity and Access Management for modern Applications and Services.
Compare Keycloak to Apollo.io or Stack Auth: