01Web
Web · Racing
Gotland Ring
Drive Gotland Ring in your browser with keyboard or touch controls.
Serious ideas. Playful interfaces.
Racing, science, and everyday tools — made in Sweden.
02Web
Web · Language
OrdNet
Every word opens a world. Explore connections between words, ideas, and meanings across five Swedish, English, and Danish dictionaries in one visual space.
03New · 2026
iPhone · Utilities
HandsFreeCom
Turn two nearby iPhones and Bluetooth headsets into a live, two-way intercom. Talk naturally over local Wi-Fi, with no internet, account, or push-to-talk button.
04New · 2026
iPhone & iPad · Utilities
HandsFreeCheck
Check your Bluetooth headset before a call. Hear your microphone through your headset and watch live input and output waveforms, with no recordings, uploads, or account.
05New · 2026
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.
06New · 2026
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.
07Mac
Mac · Education
2DTurbo
A 2D turbulence simulator, CPU benchmark, and desktop background tool that turns numerical fluid dynamics into a live visual surface.
08Updated · 2026
iPhone · Education
iTurbo
Direct numerical simulation of two-dimensional incompressible turbulence, updated for modern iPhones with richer resolution and higher Reynolds numbers.
09Updated · 2026
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.
10iPhone
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.
11iPhone
iPhone · Education
Double Pendulum
A simple physical system with wonderfully complex behavior. Tilt your device to influence a Runge–Kutta simulation of coupled motion.
12iPhone
iPhone · Education
Triple Pendulum
Three linked pendulums turn deterministic equations into surprising motion. A pocket-sized demonstration of sensitivity and chaos.
13Updated · 2026
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.
14New · 2026
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.
15New · 2026
iPhone · Education
iTurbo3D
Hold a living three-dimensional turbulence simulation in your hand. Orbit the flow, switch scientific fields, and inspect the energy spectrum in real time.
No apps in this view.
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.