how would you define the success of substack's mobile app for readers?

Introduction

Defining the success of Substack's mobile app for readers is crucial for evaluating its performance and guiding future development. To approach this product success metrics problem effectively, I will follow a simple product success metric framework. I'll cover core metrics, supporting indicators, and risk factors while considering all key stakeholders.

Step 1

Product Context

Substack's mobile app for readers is a digital platform that allows users to discover, read, and engage with content from various writers and publishers. The app serves as an extension of Substack's web-based newsletter platform, bringing the reading experience to mobile devices.

Key stakeholders include:

1. Readers: Seeking easy access to quality content
2. Writers: Looking to reach and engage their audience
3. Substack: Aiming to grow its user base and revenue
4. Advertisers: Interested in reaching engaged audiences (if applicable)

User flow:

1. Onboarding: Users sign up or log in, select interests, and follow writers
2. Discovery: Browse recommended content, search for specific writers or topics
3. Reading: Access and consume articles, newsletters, and other content
4. Engagement: Like, comment, share, or save articles for later

The mobile app fits into Substack's broader strategy of becoming the go-to platform for independent writers and their readers. It extends the reach of Substack's ecosystem beyond desktop browsers, potentially increasing user engagement and retention.

Competitors in this space include Medium, Apple News+, and Flipboard. Substack's unique selling point is its focus on independent writers and direct reader-writer relationships.

Product Lifecycle Stage: The mobile app is likely in the growth stage, focusing on user acquisition and engagement while continuously improving features based on user feedback.