Practical guides for product analytics
Event schemas, implementation guides, and validation checklists. No fluff — just what you need to set up clean, GDPR-aware tracking.
I’ve seen cohort grids used to justify bad investment decisions at least three times. Each time, the problem wasn’t the data — the grid was correct. The problem was misreading it: comparing incomplete cohorts, averaging paid and free users into… Cohort Analysis Fundamentals: Reading a Cohort Grid Correctly
Most analytics implementations I audit have the same problem: the team tracks a hundred events nobody looks at, and misses the ten that would actually answer the questions leadership keeps asking. The fix isn’t more events — it’s a measurement… The Measurement Plan: How to Stop Tracking Random Events
Reading time: 10 min · Last updated: March 2026 I once found a misconfigured purchase event that had been sending wrong revenue data for 3 months. The client had made business decisions based on €240K of phantom revenue. That’s why… Event Tracking QA Checklist: How to Validate Before Launch
Tracking debt is what happens when your event schema keeps growing but nobody cleans it up. Events added two years ago still fire from zombie code. Three different PMs have named the same action three different ways. Your dashboard shows… Tracking Debt: How It Accumulates and How to Pay It Down
Reading time: 8 min · Last updated: March 2026 Every product has a moment where a new user “gets it.” Slack’s was 2,000 messages. Dropbox’s was uploading the first file. Finding and tracking your aha moment is the single highest-leverage… Activation Metrics: How to Track Your Aha Moment
Subscription businesses run on five revenue metrics — MRR, trial-to-paid, expansion, churn, and reactivation — and every one of them is built from the events below. When I joined a Berlin SaaS client in 2023, their billing system fired four… Subscription Event Schema: The Complete Reference
Standard ecommerce tracking gives you four events — view_item, add_to_cart, begin_checkout, purchase — and calls anything in between “abandonment.” For one DACH apparel client in 2024, those four events left us blind to 38% of the drop-off. The biggest losses… The Cart Abandonment Signal: 7 Events You’re Probably Missing
Reading time: 9 min · Last updated: March 2026 Acquisition is the funnel stage that gets the most budget and the worst tracking. Teams spend thousands on ads but can’t tell you which channel actually brought their best customers. I’ve… Acquisition Tracking: Events, Attribution, and What to Measure First
I live in Munich, run analytics projects across the EU, and have watched the same consent banner get approved in France, questioned in Italy, and rewritten in Germany — all in the same quarter. On paper, the GDPR and ePrivacy… CNIL, Garante, BfDI: How Three EU Regulators Interpret Analytics Consent Differently
Reading time: 10 min · Last updated: February 2026 Google’s Consent Mode v2 became mandatory for EU advertisers in March 2024. If you’re running GA4 or Google Ads in Europe and haven’t implemented it yet, you’re losing data — and… Consent Mode v2: Implementation Guide for European Teams