Spekter

Visual GUI tool for recursive directory and file comparison.
Side-by-side and unified diff views with synchronized scrolling,
inline character-level highlighting, Meld-style Bezier gutter connectors
and a tabbed interface. Binary files are detected and reported with sizes
rather than rendered as garbled text. Detects when JSON or JSONL files
differ only in element ordering, and applies hunk-slider postprocessing
so an inserted object in a JSON array is marked as one whole object.

The diff view has a read-only caret with full keyboard navigation
(arrow keys, word-hop with Ctrl, smart Home/End, Shift to extend the
selection, Tab to move between panes, Ctrl+G to go to a line, F7 and
Shift+F7 to jump between changes). A diff opens on its first change.
Spekter watches the compared files on disk and shows a pulsing reload
chip in the header when either side changes. A change-overview minimap
on each pane marks where the diffs sit, and clicking it syncs the
opposite pane.

Large files stay responsive: a file's text appears instantly while its
diff is computed on a background thread, computed diffs are cached, and
the changed files are prefetched as you browse, so opening or revisiting
them feels immediate even at a million lines.

Ignored entries (.git, node_modules, editor swap files and the like)
are skipped but listed as dimmed stubs rather than silently erased,
and the rules go both ways: expand an ignored directory or open an
ignored file to compare it anyway, or right-click any entry to ignore
it yourself. These choices are remembered per directory pair.

An instant, keyboard-driven alternative to Meld and diff for comparing
folders and code.