
Keycloak
authentik
VoidAuth
ZITADEL
Authelia
Tinyauth
Gluu
Fully managed, multi-region, high-availability, Keycloak deployments with top extensions to run for any enterprise. 99.95% uptime SLA. 24/7 support. Built by top Keycloak experts and contributors.

Mixpanel
Plausible.io
Amplitude
Google Analytics
Hotjar
Fathom Analytics
LaunchDarkly
An open source suite of product and data tools including product analytics, feature flags, session replay, A/B testing, surveys, and more.
Which is more popular?
Based on our record, PostHog seems to be more popular. It has been mentioned 74 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | phasetwo.io | posthog.com |
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| Company | — | Startup from the United States · 20 - 49 employees · 2020 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Phase Two yet.
For developers just starting out, PostHog is a free way to understand how your product is being used, without having to send any data to 3rd parties. For enterprise customers, one data security becomes a key concern, or B2C businesses where using a SaaS solution is unaffordable, it's typical to...
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
PostHog is particularly well-suited for product teams, developers, and startups that require deep insights into user interactions and need the flexibility of a self-hosted solution. It is also a good fit for organizations that prioritize data privacy and want to maintain full control over their data.
Walkthroughs and reviews on video.
Marvel Phase Two - A Retrospective
PostHog Walk Through
More videos
How often each product is chosen within a category, 0–100% relative to the other.


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


We have no reviews of Phase Two yet. Be the first one to post
According to BuiltWith, as of February 2024, PostHog is used on 5,169 (0.52%) of the top 1 million websites. Hotjar is used by 72,048 of the top 1 million websites. Typical PostHog users are engineers and product...
BlogBackSign inBlogThe 8 best free and open-source feature flag servicesPosted byThe best open-source feature flag tools1. PostHogWhat is PostHog?Supported librariesHow much does it cost?2. UnleashWhat is...
Recommendations tracked on public social media and blogs since March 2021.


Tracking Phase Two since Jun 2026.
That setup is now one command. It creates your PostHog org and project, installs the SDK, adds the config plugin, and writes your keys into .env.local and your EAS environment variables for Production, Preview, and Development. You pick... - Source: dev.to / 11 days ago
What it deliberately does not have: accounts, cloud sync, a marketplace, Or any paywall. Telemetry is opt-in, off by default, anonymous, and collects Zero content — the endpoint is configurable if you'd rather self-host PostHog. It's... - Source: dev.to / about 2 months ago
Opus, zero nudges. Realised on its own that an abandoned signup never fires identify, triangulated the anonymous session from time, platform and registration events, decoded the PostHog replay blobs, confirmed the duplicate account in... - Source: dev.to / 2 months ago
When comparing Phase Two and PostHog, you can also consider the following products.

Open Source Identity and Access Management for modern Applications and Services.
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Mixpanel is the most advanced analytics platform in the world for mobile & web.
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authentik is an open-source identity provider focused on flexibility and versatility.
Compare authentik to Phase Two or PostHog:

Plausible Analytics is a simple, open-source, lightweight (< 1 KB) and privacy-friendly web analytics alternative to Google Analytics. Made and hosted in the EU, powered by European-owned cloud infrastructure 🇪🇺
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Single Sign-On for Your Self-Hosted Universe 🐈⬛🔒
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Chart Your Path to Growth with Digital Analytics
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