Who actually uses these products,
and what made them stay.

The PostHog Growth Engineer

A growth engineer, product engineer, or technical PM who uses PostHog as their all-in-one growth stack — analytics, feature flags, A/B tests, session replay. They chose PostHog because they didn't want to stitch together Amplitude, LaunchDarkly, and Hotjar. They think in funnels, retention curves, and statistical significance. They are technical enough to self-serve but product-minded enough to care about the "so what" behind the data.

“It happened mid-workflow — the growth engineer is running an A/B test on the onboarding flow.”

The Clay Growth Operator

A growth lead, revenue ops manager, or technical sales operator who found Clay and spent two weeks rebuilding their entire outbound motion around it. They were already combining data from LinkedIn, Apollo, Clearbit, and spreadsheets manually — a process that was slow, inconsistent, and unscalable. Clay collapsed that into one workflow. They now build outbound lists in hours that previously took weeks. They are evangelical about it. They're also aware that most people at their company don't understand what they've built.

“The head of sales wants a list of 500 Series B SaaS companies that have posted a VP of Sales job in .”

The Amplitude Growth Analyst

A data analyst, growth analyst, or analytics engineer at a Series B–D company who owns Amplitude as the source of truth for product behavior. They are technical enough to write SQL but prefer not to for exploratory analysis. They've mastered the Amplitude chart types. They build dashboards that PMs and executives use but don't fully understand. They're the person in the room who says "let's look at the data" and then actually pulls it up.

“The head of product wants to know which activation milestone most predicts 30-day retention.”

The Mixpanel Product Manager

A product manager or growth lead at a B2C or B2B SaaS company for whom Mixpanel is the primary lens on user behavior. They are not a developer. They understand events and properties well enough to answer most of their questions self-service. They have a set of saved reports they look at every Monday. They also have questions that require a data analyst to answer — and they're slowly working to reduce that list.

“A teammate asked how they managed understand where users drop out of key flows and why.”

The Beehiiv Newsletter Operator

A newsletter founder, media operator, or content entrepreneur who runs a publication with 5,000–100,000 subscribers and treats it as a business with its own P&L, not a side project. They chose Beehiiv because it was built for operators — it has ad network access, referral programs, segmentation, and analytics that treat the newsletter as a product. They think in CAC, LTV, open rate, and click-to-open rate. They have a growth number they're working toward. They may or may not write the newsletter themselves.

“They're in the monthly business review.”

The Clay GTM Engineer

A GTM engineer, growth operations lead, or RevOps professional who uses Clay as their data enrichment and workflow engine. They build spreadsheet-like tables that pull from 50+ data providers — enriching companies with technographic data, finding decision-makers' emails, scoring leads based on signals, and triggering personalized outreach. They think in data transformations and API calls. They've replaced hours of manual prospect research with Clay workflows that run in minutes. They are the engineer of the sales pipeline's data layer.

“The shift was quiet.”

The Hotjar UX Researcher

A UX researcher, product designer, or growth PM who uses Hotjar as their window into real user behavior. They watch session recordings to understand confusion, analyze heatmaps to validate layout decisions, and run micro-surveys to capture user sentiment in context. They are the person on the team who says "let me check what users are actually doing" before anyone makes a design decision based on assumptions. They think in user journeys, not funnels.

“The shift was quiet.”

The Hotjar Session Watcher

A product manager, growth marketer, or UX designer at a company of 20–500 people who uses Hotjar to answer questions that quantitative analytics can't. They know their funnel. They know where users drop off. What they don't know is why. Session recordings are how they find out. They've watched hundreds of sessions. They've seen users rage-click on things that aren't buttons, scroll past CTAs without seeing them, and get confused by flows the team thought were obvious. Each one of these is a design decision waiting to happen.

“The checkout conversion rate dropped 2.”

The Substack Independent Writer

A journalist, essayist, researcher, or domain expert who chose to publish directly to an audience rather than through a publication that owns the relationship. They've been on Substack for 1–4 years. They have a free list and a paid tier. They take the writing seriously. They also think about the business of the writing — open rates, growth, conversion from free to paid — more than they expected to when they started. They are doing something that didn't exist at scale five years ago and they feel the weight and freedom of that simultaneously.

“It happened mid-workflow — they've been on Substack for 18 months.”

The Google Analytics Marketing Analyst

A digital marketer, marketing analyst, or growth lead who uses Google Analytics as their primary source of truth for website performance. They lived in Universal Analytics for years — they knew where every report was, how sessions worked, and what their bounce rate meant. Then GA4 happened. The interface changed, the data model changed, sessions became events, and reports they relied on disappeared or moved. They're learning GA4 because they have to, not because they wanted to. They are adapting their expertise to a tool that feels like it was rebuilt for data engineers, not marketers.

“Not a single dramatic moment — more like a Tuesday at 3pm when they realized they hadn't thought about the GA4 interface is unintuitive — reports that took one click in UA now require custom explorations in two weeks.”

The Excel Financial Modeler

A financial analyst, FP&A professional, or investment banker who builds financial models in Excel the way architects build buildings — with structure, precision, and the knowledge that if one formula is wrong, everything above it falls. They've been using Excel for 5–15 years. They think in cell references, not coordinates. They know keyboard shortcuts that most people don't know exist. They've built models that a CEO used to make a $50M decision, and they've spent weekends debugging a circular reference that shouldn't have been circular.

“The CFO asks for a scenario analysis by tomorrow morning: what happens to cash flow if revenue grows 10% slower than projected and two enterprise deals slip to next quarter.”

The Substack Independent Publisher

A writer, journalist, or subject-matter expert who has turned their expertise into a Substack newsletter with paying subscribers. They are not a blogger — they are running a media business. They write 2–4 times per week, manage a growing list of free and paid subscribers, and check their subscriber metrics more often than they'd admit. They chose Substack because it was the simplest path from "I should write" to "people are paying me to write." They appreciate the simplicity but worry about what happens if the platform changes its terms.

“The shift was quiet.”