how would you measure the success of substack's newsletter publishing platform?

Introduction

Measuring the success of Substack's newsletter publishing platform requires a comprehensive approach that considers multiple stakeholders and metrics. To effectively evaluate this product success metrics problem, I'll follow a structured framework covering core metrics, supporting indicators, and risk factors while considering all key stakeholders.

Step 1

Product Context

Substack is a platform that enables writers to create and distribute newsletters, build a subscriber base, and monetize their content through paid subscriptions. Key stakeholders include:

1. Writers: Content creators looking to build an audience and generate income
2. Readers: Subscribers seeking quality content on specific topics
3. Substack: The company aiming to grow its platform and revenue
4. Advertisers: Potential future stakeholders if Substack expands its monetization options

The user flow typically involves:

1. Writers sign up and create their newsletter
2. Readers discover and subscribe to newsletters (free or paid)
3. Writers publish content, which is distributed to subscribers
4. Readers engage with content and potentially upgrade to paid subscriptions

Substack fits into the broader creator economy strategy, empowering individuals to monetize their expertise and following. Compared to competitors like Medium or Patreon, Substack focuses specifically on newsletter publishing with integrated payment systems.

In terms of product lifecycle, Substack is in the growth stage, having established product-market fit and now focusing on scaling its user base and revenue.