LESS GUESSWORK. MORE UNDERSTANDING.

A little clarity,
every step.

From your first equation to your next circuit.
Work it through, wherever you are.

A colorful illustrated engineering study workspace — Big ideas. Pocket-sized.

What are we solving?

01 / INPUT

What this solver supports

Natural input uses bounded, offline C++ grammars, not an online language model. State the operation and its values. Missing or unsupported details need clarification; arbitrary word problems are not supported. Turn off automatic interpretation to use the selected type and exact syntax. Calculations use floating-point arithmetic unless stated otherwise.

FIND YOUR NEXT CHALLENGE

Your engineering toolkit.

55 focused problem types. Clear examples. Honest boundaries.

Find a topic

PICK UP WHERE YOU LEFT OFF

Recent work.

The last 30 problems, saved only on this device.

A WORKBENCH THAT GOES WITH YOU

Online. Offline.
In your pocket.

The same solver, without an account or a subscription.

↓

Install this website

Visit once online, prepare offline access, then revisit this same Render address in the same browser without internet. On Android use Chrome’s “Install app”; on desktop use Chrome or Edge’s install menu. No separate local server is needed for the cached website.

Preparing offline files…

Wait for “Ready offline” before disconnecting. Private browsing, cleared site data or browser storage eviction can remove offline access. Updates preserve your current input before reloading.

↓

Download for your device

Version 0.5.0-rc2 · preview. Downloads need a connection; installed packages solve offline.

Android APK ↓Android 7+ · arm64 / x86-64 · optimized, development-signed preview. Export saved solutions before replacing an older, differently signed APK.
Windows ZIP ↓64-bit Windows. Extract everything; open Start-Pocket-Engineer.cmd.
macOS ZIP ↓macOS 11+ · Intel / Apple Silicon. Extract; open Start-Pocket-Engineer.command. Not notarized.
Linux ZIP ↓x86-64, static C++ runtime; tested on Ubuntu and NixOS. Extract; run sh Start-Pocket-Engineer.sh.
Website ZIP ↓Complete website and WASM solver for localhost or HTTPS hosting. Not for double-clicking index.html; choose a desktop ZIP for a ready-to-launch app.

Keep the desktop launcher’s terminal open. No Python or Node is needed. Executables are not code-signed; do not disable system-wide security protections.

Release notes & installation help ↗

Download SHA-256 checksums ↓

Builds & test evidence ↗

Requires JavaScript and a browser with WebAssembly and Web Workers. Offline website installation requires HTTPS or localhost. No promise is made for every device or browser version.

OFFLINE ENGINEERING LABS · C++ POWERED

Build it. Inspect it.

Connected circuits, sampled signals and state machines. The model and its limits stay visible.

REPRODUCIBLE TEST DEMOS

Put it through its paces.

5,000 stored cases for each difficulty in each of the original 55 problem types. All 825,000 cases are included in offline preparation and app downloads.

Expected answers are saved regression snapshots, not independent mathematical proof. Independent correctness checks are documented in the test history. The new engineering labs have separate independent tests and runnable presets; they are not counted in this 825k bank.

1. Category

2. Problem type

3. Difficulty

Open this view after the engine starts.

Expected solving time: calibrate on this device to get an estimate. Timing depends on input, browser and device.

Case	Input	Saved expected answer	Measured result	Open