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tech<br />

follow The<br />

North Star<br />

Chad Pytel,<br />

Founder and CEO of<br />

Thoughtbot.co.uk<br />

If you’re getting<br />

a constant<br />

number of new<br />

customers every<br />

month, you’re in<br />

trouble, because<br />

that means your<br />

growth rate is<br />

decreasing.<br />

It is difficult to prioritise between product and<br />

growth. Should we write a new feature or remove<br />

one? Fix that bug, improve the UI, or optimise<br />

our funnel? Maybe write a blog post for a lead<br />

nurturing campaign?<br />

The North Star has been used for navigation since<br />

Late Antiquity. And using it as a metaphor, we can<br />

guide startups by answering a simple question:<br />

How many people are getting authentic value from<br />

our product? Authentic value. We’re not measuring<br />

vanity metrics such as page views, sessions,<br />

followers, or users. The moment when a user gets<br />

authentic value.<br />

Example North Star metric<br />

Thoughtbot’s mission is to create better products.<br />

We believe keeping code in a consistent style helps<br />

create better products.<br />

Our product Hound (houndci.com) does that job by<br />

reviewing GitHub pull requests for style violations.<br />

The moment Hound reviews code is called a<br />

“build.” That is the moment a user gets authentic<br />

value. It is the moment the product’s job is done.<br />

So Hound’s North Star metric is the number of<br />

teams with builds.<br />

How to calculate it<br />

We’ve often calculated the North Star metric using<br />

our application’s SQL database. In the case of<br />

Hound, aggregating our ‘build’ data into weeks<br />

and restricting the time window to the previous<br />

quarter, including the week in progress.<br />

Paul Graham has written that Y Combinator<br />

startups should grow by 7% per week:<br />

“When I first meet founders and ask what their<br />

growth rate is, sometimes they tell me “we get<br />

about a hundred new customers a month.” That’s<br />

not a rate. What matters is not the absolute number<br />

of new customers, but the ratio of new customers<br />

to existing ones. If you’re really getting a constant<br />

number of new customers every month, you’re in<br />

trouble, because that means your growth rate is<br />

decreasing.”<br />

It’s necessary to calculate both absolute numbers,<br />

and growth rate to understand the product’s health.<br />

We want to know Hound that currently has “266<br />

teams with builds per week”, and is growing at<br />

“9% per week” (the average of the trailing quarter,<br />

excluding the current week).<br />

Visualising the data<br />

We can use Heroku Dataclips’ CSV export and<br />

Google Spreadsheets to get our data into Google<br />

Spreadsheets, where we can chart it and analyse<br />

it.<br />

We calculate new teams by subtracting the<br />

retained teams from the total teams. The “Goals”<br />

section is calculated by multiplying last week’s<br />

teams by 1.07 (a 7% growth rate). The “Current”<br />

section is calculated by dividing this week’s teams<br />

by their corresponding goals.<br />

Data generates the necessary questions<br />

The bottom chart and our current progress toward<br />

our goals helps us make decisions about whether<br />

to focus on customer acquisition (marketing) or<br />

customer retention (product). The data is telling<br />

us that retention is good but acquisition is not.<br />

Our North Star metric asks us “which customer<br />

acquisition channels are working best?” and “is it<br />

an awareness problem or an activation problem?”<br />

Compare the Hound chart to another product’s<br />

chart (Pic. 1) In this example, the data is telling us<br />

that we’re still making something people want, but<br />

not yet ready for marketing.<br />

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