Lenny Rachitsky argues that product and business teams should start experimenting with custom GPTs now, since AI tools are often dismissed as a fad or too complex. He explains what GPTs are, how to build one by…
“If you haven't read Lean Analytics by Alistair Croll and Ben Yoskovitz, stop reading this blog post and go pick up a copy. No really. It's that good. For those of you who didn't stop reading to go buy the book, I'll work on convincing you.”
Cagan argues that 'user abuse' happens when product teams ship changes that users didn't ask for, didn't expect, or can't absorb, and that it is largely caused by the natural human resistance to change. He explains that…
Lenny Rachitsky shares how he evaluates marketplace business ideas after reviewing 100+ companies. He argues that founders and investors should first test the underlying business against seven core criteria…
Teresa Torres argues that A/B testing should follow the scientific method rather than being used for trivial tweaks like button colors or wording. She recommends starting from a real insight about why recipients ignore…
The post argues that a Product Hunt launch is worth the heavy time investment only for the right product and goals, and outlines seven tactics for a strong launch alongside five common myths. It frames…
Teresa Torres argues that the rapid user decline of BranchOut, a Facebook-based social recruiting app, was predictable because its core assumption failed. Her team had built a similar product and, through interviews…
This post sets out what product teams should realistically expect from email metrics: open rates, click-through rates, conversion rates, and unsubscribes. It explains that open rates are an imperfect approximation…
Teresa Torres argues that product emails only help if they are designed to convert, and recommends building a reusable email template rather than designing each message from scratch. A template lets teams user-test and…
Teresa Torres argues that even improvements to a product will trigger resistance, because users must adjust to any change. She contrasts Facebook's rocky rollout of the News Feed and Beacon with its smoother launch of…
The post argues that marketplaces succeed by choosing one of three routes: delivering far more convenience, offering a significantly lower price, or unlocking desirable supply that customers want. It also explains what…
Cagan argues that shipping updates to an established user community requires care, because users dislike change and today's connected internet lets them punish bad releases quickly. He calls the disciplined approach to…
Teresa Torres uses her annual letter to reflect on a burnout-filled 2024, where she rediscovered joy in her work by reworking her community, launching a self-paced course, and tightening her email and webinar offerings…
Lenny Rachitsky's year-end roundup collects the most popular posts from his newsletter, grouped by theme such as AI, career, strategy, growth, and execution, plus a few all-time classics. He also reviews his 2025 goals…
Hiten Shah surveyed practitioners about how they measure customer happiness and found that 55% rely on Net Promoter Score, a single-question metric in use since 2003. The article reports other methods, including…
Marty Cagan argues that product teams can find major opportunities by letting customers use their products for purposes the company never planned or officially supports. He describes this as a third path beyond…
Marty Cagan argues that competition is a constant in most markets, yet companies often waste energy reacting to rivals through feature-chasing and attacking competitors' weaknesses. He contends customers rarely leave…
Shreyas Doshi argues that a common implicit assumption, that everything should be meant for everyone, is mistaken, and that treating narrow fit as a defect leads people to create and consume poorly. The essay's framing…
Teresa Torres argues that frequent, consistent customer interviews are a keystone habit of continuous discovery, since they make other discovery habits easier to adopt. She addresses who to interview: early on, anyone…
Teresa Torres argues that the biggest barrier to continuous discovery is getting consistent access to customers, and that teams must automate recruiting so interviews happen without weekly hustle. She explains that…
NHS clinicians get ten minutes with a generalist, if they can get an appointment at all—leaving little room for the specific, personal questions women's health actually requires. Hertility Health made a longer intake mandatory before purchase, and something unexpected happened: conversion went up…
Lenny Rachitsky explains how marketplace and platform builders should choose a take rate, the fee charged on each transaction. He introduces a simple formula combining convenience and demand minus competition, walks…