I Built an Inbox Cleaner That's 88% Greener Than Cloud Alternatives. Here's How.

I had 50,000 emails in my inbox. Most cleaners wanted £8/month and my data. So I built my own.

Here's why MailBroom runs entirely on your iPhone, why that matters for privacy, and why it's 88% greener than cloud alternatives.

The Problem

Most email cleaners – like Clean Email – use cloud-based AI. That means your emails leave your device, get processed on energy-hungry servers, and contribute to data centers' 0.3% of global emissions.

According to the Carbon Literacy Project, a standard email generates about 4 grams of CO₂e. With 281 billion emails sent daily in 2018, that's ~410 million tons of CO₂ annually – nearly half the emissions of commercial aviation.