You use the same calculation often enough that a small dedicated tool would save repeated typing. OGAD (Off Grid AI Desktop) can turn the formula into an HTML calculator using a local model. Preview the controls, check known answers, then download a file you can open offline.
| Download OGAD for Mac or Windows | Desktop releases |
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Start with a simple unit conversion or arithmetic task. The useful result is a calculator whose behavior you can verify, not an untested answer wrapped in a polished screen.
What should the first calculator do?
Choose a formula you already understand and state the units. For example, a distance converter can multiply kilometers by 0.621371 to show approximate miles. You can verify a few inputs before relying on it.
OGAD’s HTML canvas is part of the free desktop app on supported Mac and Windows computers. Download a local model suited to code, then keep it selected for generation. No cloud code service is required after setup.
Give the model a small, checkable request
Try this prompt:
Build a kilometers-to-miles calculator as one HTML file with inline CSS and JavaScript. Use miles = kilometers * 0.621371 and display four decimal places. Label both units. Accept zero and positive decimal values. Reject blank, negative, and nonnumeric input with a clear message. Use no external assets or network requests. Return one fenced html code block.
The prompt names the formula, input rules, and output precision. This gives you specific behavior to check instead of asking for a vague “good calculator.”
How do you make and check it?
- Select a downloaded local coding-capable model in Models > Text.
- Send the prompt in Chat.
- Open the artifact card or choose Open canvas from the reply menu.
- Select Preview and enter the known values below.
- If a case fails, ask for that exact correction and retest.
| Input in kilometers | Expected display in miles |
|---|---|
| 0 | 0.0000 |
| 1 | 0.6214 |
| 10 | 6.2137 |
| 2.5 | 1.5534 |
Also try a blank field and a negative value. They should follow the rules in your request. Check whether pressing Enter behaves like clicking the calculate control if that matters to how you use the tool.
Use these expected values to check the example formula in your generated calculator.
How do you improve the calculator?
Once the arithmetic and validation work, ask for a specific improvement such as a Reset button or clearer labels. Keep the formula unchanged during a visual revision.
Add a Reset button that clears the input, result, and error message. Keep the conversion formula and validation unchanged. Return the complete file.
Use Code to inspect the formula and input handling. Generated code can still contain errors that a few examples do not expose. Use stronger verification for calculations that affect money, safety, or other important decisions.
How do you use it without internet?
Select Download in the canvas and open the saved HTML file in a browser. Disconnect internet and repeat the known-value checks. A page with inline code and no external dependencies can run without a remote service.
The released artifact canvas provides HTML preview and download. It does not validate the formula for you or turn the calculator into a native installed app.
Download OGAD, build the converter, and check the four known answers. Keep the HTML file only after the input rules and arithmetic behave as requested.