engineering tools for the browser, with the maths left in
Mesh a gear train. Find out where a bullet lands. Pick the launch date for a trip to Jupiter. Real physics, nothing to install, and every tool tells you what it cannot do.
Each one is its own little site with its own terms. Free to try; some sell time-limited passes for the things the server has to work out for you.
CAD / mechanisms
Gears that actually mesh.
Parametric gear CAD with a conscience: trains stay meshed while you edit, shafts and layers behave, and the torque, speed and tooth-contact numbers come out of real mechanics. Comes with Swiss watch movements and the Antikythera Moon train as presets.
Shooting / physics
Where does the bullet go?
An external-ballistics workbench tuned for .22 LR: a real drag-model solver for drop, drift, energy and time of flight, with loads you can compare and trajectories you can watch.
Space / astrodynamics
Plan the burn. Pick the date.
Launch windows, porkchop plots, gravity assists, Lagrange orbits and the stars within ten light years: 519 ready-made missions, each worked out by the physics rather than drawn by hand. Paid passes unlock the full data pack for your own tools.
Concept-stage workbenches that run on one machine and are not on the internet yet. They are here because they are the next ones in the queue, and because it is more honest than pretending the queue is empty.
Generative design and 4-axis CNC planning for small internal-combustion engines, up to a litre.
concept stage3D-printable air compressors, reciprocating or scroll, printed in PETG-CF, with the seals in TPU.
concept stageDesign, wind and test your own FPV outrunner motors, from the magnetic circuit to the coil layout.
concept stageTurn a salvaged hoverboard or washing-machine motor into the generator or motor you actually need.
concept stageTelescope and microscope designs with a real ray trace, plus the printable parts to hold the glass.
concept stageA robotic crane arm from cheap lead-screw actuators, steel tube and printed brackets, with the loads worked out.
concept stageWhy does a hydraulic walker burn several times its weight per metre when a cat uses a fraction? A legged-vehicle design bench.
concept stageEvolves the most energy-efficient vehicle for a stated mission from a catalogue of real, buyable parts.
concept stageA local AI agent that drives the other generators and assembles their results into whole systems, telescope to launch window.
concept stageWant one of these sooner, or have a tool in mind? .
Lambert solvers, drag models and involute geometry, not look-up pictures. Numbers are checked against something independent of the code that made them: conserved energy, the Sun's declination at the solstice, the rocket equation by hand.
No accounts. Your work lives in your browser session and you save it as a file. We never see it unless you send it with a report.
Designing and planning are free. A time-limited pass unlocks the downloads the server has to compute for you. No subscriptions, no renewals.
Education and design-study tools. Not navigation, not safety-critical, not certified engineering. Each one says what its model leaves out, in plain words.
Tell me. It goes to a real inbox and I read everything.