Theory of Computation is one of those undergraduate CS courses that lives or dies by how well you can visualize what's happening. State machines on a whiteboard are fine, but watching a DFA actually consume an input string symbol-by-symbol is a fundamentally different learning experience. That's exactly what syafiq-na/automata-calculator sets out to deliver — a browser-based playground for the classical automata theory toolkit.

The repo bundles together four operations that typically require four separate tools (or a lot of pencil-and-paper):

• DFA Testing — feed an input string into a deterministic finite automaton and watch acceptance/rejection play out.
• Regex → NFA conversion via Thompson's Construction, the canonical algorithm every compilers student eventually meets.
• DFA Minimization — collapse equivalent states into the smallest recognizing machine.
• DFA Equivalence checking — decide whether two machines accept exactly the same language.

What makes this interesting beyond "yet another homework helper" is the architectural choice: the author specifically calls out an OOP architecture on the Flask backend. That's a meaningful signal — automata code often devolves into tangled dictionaries of transitions, but modeling State, Transition, and Automaton as proper objects makes the algorithms readable and the code itself useful as a teaching reference. Pairing that with a vanilla-JS frontend (no framework bloat) means the whole project is approachable for students who want to actually read the source rather than fight with build tooling.

Who benefits? Three audiences: undergrad CS students grinding through automata coursework, instructors who want a free interactive supplement to lectures, and self-taught developers tackling compilers or regex internals via Crafting Interpreters or the Dragon Book. It's also a decent reference implementation for anyone building a regex engine from scratch.