ODEPLOT plots direction fields, integral curves, phase portraits, 3D trajectories, PDE characteristics and variational extremals in the browser.

No. Enter an equation and click the field.

In your browser localStorage. They are not sent to our server. Clearing site data removes history and theme.

Letters in the expression (e.g. a*x + b*y) that are not x, y or standard functions become sliders.

Explicit 4th-order Runge–Kutta (RK4). It is numerical, not a symbolic closed form.

Slots fund hosting. CIS visitors get Yandex YAN; everyone else gets Google AdSense. Ads do not change the math. See the cookie policy.

Open the language menu in the header. The sun/moon icon toggles theme. Both are saved in localStorage.

Yes. Canvas pages have a PNG button and a shareable link with the equation.

You may not copy the site: not whole pages, not the code, not the design, not the texts. Mirrors, clones and passing ODEPLOT off as your own service are not allowed. You may use the visualizer online and save finished images with the PNG button — those pictures can go into homework, a talk or notes. You may also copy the formula and a link to the plot for yourself.

The contacts page has USDT (BEP-20 / TRC-20), email, and contributions of examples.

The layout is responsive, but 3D scenes need more memory. Close extra tabs or use a desktop for heavy sections.