# FLY – Fruit Fly Brain — Virtual pet with 139k neurons

> Virtual pet with 139k neurons (iPhone/iPad app by Tadeas Urbanek.)

- Source: https://appshunter.io/ios/app/fly-fruit-fly-brain/id6816010028 (this page in markdown: same URL + `.md`)
- Developer: [Tadeas Urbanek](https://appshunter.io/developer/1879307180)
- Category: Education
- Price: Free
- Age rating: 4+
- Requires: iOS 27.0 · 100 MB
- Languages: American English
- Released: 2026-10-08
- Data updated: 2026-10-08
- User reviews in markdown: https://appshunter.io/ios/app/fly-fruit-fly-brain/id6816010028/reviews.md

## What is FLY?

A pet fruit fly driven by a model of its real brain.

FLY runs a whole-brain model of Drosophila in real time on your phone: 138,639 neurons and 15 million connections from the FlyWire connectome, mapped with an electron microscope. When you drop sugar in the terrarium, touch the antennae or cast a shadow, the stimulus travels through the fly's actual wiring, and that decides whether it feeds, grooms or escapes.

• 3D glass terrarium with a fly based on the NeuroMechFly model, walking with a real fly's step cycle
• Live brain map: see which neurons are firing right now
• Hunger, thirst, hormones and sleep: a hungry fly is more sensitive to sugar and sleeps at night
• Your fly keeps living when the app is closed and lets you know when it gets hungry
• Lab: watch the firing rates of the neurons behind feeding, grooming and escape

Honestly: this is a scientific model, not an uploaded fly. The wiring is real, the neurons are simplified. Hunger, hormones, sleep and walking are simplified models based on the literature. The Science & Licenses screen explains what is what.

Free, no ads, no tracking, no account.

Data: FlyWire (Dorkenwald et al. 2024, Schlegel et al. 2024), brain model by Shiu et al. 2024, body from NeuroMechFly (Wang-Chen et al. 2024).


## Version history (last 1 release)

### 1.0 — 2026-10-08

No release notes.

## More apps by Tadeas Urbanek

- [LooCation – Toilet Finder](https://appshunter.io/ios/app/loocation-toilet-finder/id6759528666)

All apps by Tadeas Urbanek: https://appshunter.io/developer/1879307180

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-08.*