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A comprehensive 2025 evaluation of terminal emulators' Unicode support using the ucs-detect tool reveals Ghostty and Kitty as top performers with correct grapheme cluster handling. The analysis covers character width calculations, DEC Private Modes support, and performance benchmarks across major terminals. Notable findings include significant performance issues in iTerm2 and VTE-based terminals, inconsistent behavior in several emulators, and the emergence of variable-width text protocols as a solution for displaying complex scripts and improving accessibility beyond fixed monospace constraints.

State of Terminal Emulators in 2025: The Errant Champions · Articles