Serious ideas. Playful interfaces.

Racing, science, and everyday tools — made in Sweden.

Gotland Ring racing gameplay with a red Impreza on the circuit

Web · Racing

Gotland Ring

Drive Gotland Ring in your browser with keyboard or touch controls.

Play in browser
03New · 2026
ViscousJoukowski icon

iPhone · Education

ViscousJoukowski

Explore viscous flow around an airfoil. Adjust its shape, angle, and Reynolds number, then watch lift, drag, and vortices evolve alongside the classical potential-flow solution.

04New · 2026
Protein Energy icon

iPhone · Food & Drink

Protein Energy

Scan packaged food and see its protein-to-energy ratio at a glance. Save products and recipes locally, with no account, ads, analytics, or tracking.

05Mac
2DTurbo icon

Mac · Education

2DTurbo

A 2D turbulence simulator, CPU benchmark, and desktop background tool that turns numerical fluid dynamics into a live visual surface.

06Updated · 2026
iTurbo icon

iPhone · Education

iTurbo

Direct numerical simulation of two-dimensional incompressible turbulence, updated for modern iPhones with richer resolution and higher Reynolds numbers.

07Updated · 2026
Mechanical Pendulums icon

iPhone · Education

Mechanical Pendulums

Explore double through octuple pendulums, now rendered edge-to-edge in Metal. Tilt your phone and watch order tip beautifully into chaos.

08iPhone
Kutta Joukowski icon

iPhone & iPad · Education

Kutta Joukowski

Shape an airfoil with your fingertips and see the streamlines and pressure distribution respond — an interactive introduction to aerodynamic lift.

09iPhone
Double Pendulum Simulation icon

iPhone · Education

Double Pendulum

A simple physical system with wonderfully complex behavior. Tilt your device to influence a Runge–Kutta simulation of coupled motion.

10iPhone
Triple Pendulum icon

iPhone · Education

Triple Pendulum

Three linked pendulums turn deterministic equations into surprising motion. A pocket-sized demonstration of sensitivity and chaos.

11Updated · 2026
ATimer icon

iPhone · Medical

ATimer

A visual timer that makes remaining time easy to understand. Designed for routines, focus, homework, and anyone who benefits from seeing time.

12New · 2026
3DTurbo icon

Mac · Education

3DTurbo

Real-time 3D turbulence on the Mac, pairing a spectral Navier–Stokes solver with a GPU volume ray marcher and live scientific diagnostics.

Independent since 2009

Built by Torbjörn Sjögren

One developer.
Many ideas.

Mannetroll Solutions AB is a one-person software studio in Sweden. The work sits where computational physics, practical tools, and the pleasure of understanding something meet.

No growth loops. No sprawling platforms. Just focused apps for the web and Apple devices that do one interesting thing well.