Get car sick when you read, scroll or play games on your phone in the car? Perusa is a motion sickness app for passengers. Small motion cue dots at the edges of your screen move with the car's real braking, speeding up and turns, so your eyes see the motion your body feels. It works over e-books, your browser, messages, video and games: in the back seat, on the bus, in a taxi or rideshare.

Perusa is a comfort aid, not a medical device. It does not diagnose, treat, cure, or prevent any condition. It is for passengers only — never use it while driving. Perusa asks you to confirm you're a passenger, and asks again every 90 days. If you experience severe or persistent motion sickness, nausea or dizziness, talk to a doctor.

Your first 3 hours of rides are free, then you unlock it once for US$1.99 (in the US; price varies by country). Only the time the dots are on screen counts, a ride is never cut off partway, and stops under 20 minutes count as the same ride. No subscription, no ads.

Looking for motion sickness dots or a car sick setting for your phone? Perusa adds them to phones with Android 8 or newer. No system update needed.

MOTION CUE DOTS, STILL THROUGH POTHOLES
Motion sickness, car sickness, travel sickness — whatever you call it, it comes from slow motion: the 0.1–0.5 Hz sway of braking and cornering. Potholes and road shake are 2–20 Hz and don't count. Perusa is built on that research. Its cues follow the slow band and ignore the rest, so the dots don't jump with your hand or the road. They stay still until something real happens.

LEARNS WHAT WORKS FOR YOU
Everyone's motion sensitivity is different. Say yes to Tune to me and Perusa asks how you felt after each drive — one tap on a notification, never mid-drive — then tries one small change at a time and keeps it only if you rate those rides better. Otherwise it's undone automatically.

WORKS ON THE PHONE YOU HAVE
Android 8 and up. No system update, no special hardware. The overlay sits on top of almost any app — e-books, your browser, messages, video, games — in a car, taxi, rideshare or bus.

PRIVATE BY DESIGN.
No account, no trackers. Perusa reads speed to know you're riding; your location is never stored and never leaves the phone. Sharing ride summaries and short motion clips is optional and asked once — no name, no account, never your location.

HOW IT WORKS
• Start Perusa, then open anything — a book, a browser, messages, games.
• Dots appear around the edges of the screen, in your peripheral vision, outside the text you're reading.
• Taps pass straight through — the overlay never blocks what you're doing.
• Starts when the car does and stays up for the whole ride — cues don't blink out at every stop light. They stand down on their own when the drive ends.
• Try it before you ride: Simulate Driving previews the cues from your couch.

ALSO
• Intensity slider — from barely-there to prominent.
• Sensitivity and bump filter controls.
• Auto-pause over apps you choose (banking, password managers).

If you get queasy or carsick as a passenger — commutes, carpools, road trips — Perusa is the motion sickness relief app built for reading on the move.