Hey

I’m Charles Guo. I spent 10 years building software at Google and Airbnb — products that millions of people use every day. At Google I worked on G Suite, so I’ve been thinking about email and productivity tools for a long time. Airo is the email app I’ve spent the last two years building, and it started with a very specific problem in my own family.

ADHD and the Pile-Up

I have family members with ADHD, and probably a bit of it myself. Their inboxes pile up because filing is decision-heavy, and that kind of boring, repetitive decision work is exactly what ADHD makes hard. One email at a time, one little choice at a time — archive, label, reply later, delete — until the unread count is in the thousands and opening the app feels worse than ignoring it.

I’d watched this happen for years. The advice is always the same: “just do inbox zero.” But the problem isn’t motivation. The problem is that the interaction shape of email — click, decide, click, decide — is hostile to brains that struggle with repetitive micro-decisions.

There’s a separate page that walks through the specific features I built for this. It covers Focus mode, longer undo windows, quiet hours, and motion-reduction settings: Airo Mail for ADHD.

The Right Interface for Email Is Guitar Hero

I also love video games. Games are very good at making repetitive decision work feel like flow instead of friction. So I built AutoFile: filing email shaped like Guitar Hero.

Emails come down a track with the AI’s suggested action next to each one. There’s a line in the middle, and as you scroll, emails reach it and the action commits — filed, archived, whatever. You veto the misses before they cross. I get through about 100 emails a minute this way.

AutoFile doesn’t replace you reading your inbox. Every email still passes through your eye. AutoFile isn’t about hiding email — it’s about making review fast enough to actually do. The AI pre-sorts the easy decisions and you see them all at scroll speed instead of click by click, catching exceptions as they go.

The hardest part to get right was the threshold line itself, the visual divider between “filed” and “pending.” It’s what makes AutoFile feel safe instead of scary: you can always see what’s about to be filed and what isn’t, and you can always back up. Without the line, “AI that files your email” is terrifying. With it, filing email feels like a mini-game instead of a chore.

A Real Email Client

AutoFile is the reason I started, but the rest of the product is a full email client. iOS, Android, web. Unified inbox across multiple Gmail accounts. A package tracker that actually calls FedEx, UPS, and USPS instead of parsing delivery dates out of the confirmation email. A trips view that groups bookings into itineraries. Tasks and follow-ups pulled straight from your email — replies you owe, asks buried in threads, and sent emails still waiting for a response, surfaced right on the email itself.

Each of those exists because the same ADHD brains that need AutoFile also lose track of packages, trips, open loops, and threads scattered across accounts.

The Bet

AutoFile is the bet I’ve spent almost two years on: that filing is the actually-broken part of email, and that gamifying review fixes it.

If you’ve ever stared at a four-digit unread count and just closed the app, I’m building this for you.