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Open source product analytics provider PostHog today announced it has secured $15 million in a series B round of funding from Y Combinator’s Continuity Fund and GV, Google’s venture capital arm.

The news, which comes less than a day after rival Amplitude hit a $4 billion valuation from a $336 million round, shines further light on the rapid digital transformation companies are undergoing as a result of the pandemic.

It has been a busy couple of years for PostHog, a remote-first company with an official HQ in San Francisco. Founded in 2019 as a predictive analytics tool for sales teams, the startup pivoted to product analytics during its tenure at Y Combinator (YC) in early 2020 and went on to close a $3 million seed round in April, led by YC’s Continuity Fund. That was followed by a $9 million series A round led by GV in December.

Today, PostHog claims users from a slew of major companies, including Staples, SpaceX, and Grafana.


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In a nutshell, PostHog serves companies with data and analytics covering how people are using their products, offers insights into notable trends and user retention, and helps remove bottlenecks and reduce churn. The PostHog platform includes “feature flags,” which enable product teams to test experimental new features with a subset of users by toggling them on or off, while session replays let users watch a specific app-browsing session to understand how customers are actually interacting with their product.

PostHog: Session recording

Above: PostHog: Session recording

Alongside its funding news, PostHog unveiled a self-hosted plan that lets companies track their product engagements on their own infrastructure for free.

It’s worth noting that this is separate from PostHog’s fully open source product that’s available on GitHub under a permissive MIT license for anyone to deploy as they wish. PostHog open source is designed for product teams tracking no more than 10,000 users a month, due to the fact it uses a less scalable database (PostgresSQL), which isn’t great at performing analytical queries on larger datasets.

PostHog Free, on the other hand, uses ClickHouse. This requires a little more spadework to configure correctly, but it is designed to scale to 1 million users per month. And while it isn’t fully MIT-licensed yet, PostHog product marketer Joe Martin told VentureBeat the company plans to make it fully open source and self-serve “in a few months.”

So does this mean PostHog will essentially have two open source products? According to Martin, the plan is to merge the technical improvements from PostHog Free into the existing open source product, thus making PostHog open source far more scalable.

“We ultimately want it to be suitable for everyone from individual hobbyists through to developers in enterprises, but there are some technical goals we need to reach first,” Martin explained.

Elsewhere, PostHog offers two plans designed for enterprise-grade companies — the self-hosted PostHog Scale, which is managed by the customer with support from PostHog, and the fully hosted PostHog Cloud, where PostHog takes care of everything.

Open source ethos

PostHog’s business structure — creating an “open core” business model on top of an open source product — is one that has become increasingly commonplace across the technology spectrum. Opening its platform to the developer community helps build bridges with potential users and creates a potentially lucrative inroad to more paid customers further down the road.

“The way we think about this is guided by our mission, which is to increase the number of successful products in the world,” Martin said. “If we can help more users out for free, we invariably get a higher volume of inbound paid enquiries. Often a developer that finds us useful on a side project one weekend may decide to take us into work on Monday.”

With another $15 million in the bank, the company is now spooling up to cater to growing demand for its product, with plans to double its headcount by the end of this year and then again by the end of 2022.

“We actually weren’t planning to raise more funds this soon, but we were getting swamped with demand and were literally unable to keep up,” Martin said.

In terms of its own product roadmap, the company said it’s planning to introduce better support for “data ingestion and export to data warehouses,” and it also plans to build on its recently launched plugins library, which enables developers to tailor PostHog to suit their own use cases — in other words, “PostHog-as-a-platform.”

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