DiffDuo is a free online diff checker that compares two texts, files or code snippets directly in your browser. It shows removed lines in red, added lines in green and highlights the exact words that changed, in either a side-by-side split view or a git diff-style unified view.
Plus(월 $20)는 Work와 Codex에서 5시간 롤링 메시지 상한이 적용되고 표준 채팅에서 GPT-6 Pro를 사용할 수 없습니다
–Free, Go, Plus, 그리고 별도의 Pro 세 등급으로 이어지는 5단계 소비자 요금 구조 때문에 적절한 한도를 고르기 어렵습니다
–하위 등급의 Instant 컨텍스트 창(Plus 54K, Pro 128K)은 Google Gemini의 표준 1M 토큰 창보다 작습니다
DiffDuo
DiffDuo is a free online diff checker that compares two texts, files or code snippets directly in your browser. It shows removed lines in red, added lines in green and highlights the exact words that changed, in either a side-by-side split view or a git diff-style unified view.
Split and unified views
Read changes in two columns side by side, or switch to a single-column unified diff in the same format as git diff and patch files.
Word-level highlighting
Darker highlights mark the exact words and characters that changed inside a modified line, not just the lines that differ.
Local, private processing
The comparison runs entirely in your browser, so confidential code, contracts and config files never leave your device.
Whitespace and case tolerance
Ignore whitespace, indentation and capitalisation differences, and control how much unchanged context is shown around each change.
강점 및 장점
+Runs fully in the browser, so sensitive text and code are never uploaded
+Free with no sign-up, no usage limits and no advertising
+Word-level highlighting makes edits inside a line easy to spot
+Unified view matches git diff and patch format, including hunk headers
+
Handles large files, including files with 100,000+ lines, without freezing the page
+Interface available in many languages
한계
–Limited to plain-text comparison, with no semantic or AI-based code review
–No account, saved history or team collaboration features
–Requires JavaScript to be enabled in the browser
–No desktop or command-line client, so it is a manual copy-and-paste workflow
