- Discovery of divergence (NaN/∞), step size too small, failed Newton.
- Comparison with exact solution: maximum error, end error, column in the table, dotted line in the graph.
- Scale/shift graph, yi–yj phase plane for systems.
- Table of values and CSV export (sharing via FileProvider).
- 13 built-in examples (growth, cooling, oscillators, pendulum, Van der Pol,
Lotka–Volterra, Lorentz, rigid equation, explosion of the solution, resonance).
- Languages in the application: English (default), Bulgarian, Deutsch, Français, Español.