DiffNow VS Ediff

DiffNow lets you compare text files, documents, binary files, and archives up to 1024KB in size.

Ediff is a comprehensive visual interface to Unix diff and patch utilities.

Ease of Use
DiffNow offers an intuitive and straightforward interface that allows users to easily compare files, directories, and pasted text without needing any technical expertise.
Accessibility
Being a web-based tool, DiffNow is accessible from any device with an internet connection, enabling users to perform comparisons anywhere and without installation.
Multiple File Formats
The service supports a wide range of file formats, making it versatile for comparing various types of documents, code files, and even binary files.
Free Usage
DiffNow offers a free tier that allows users to perform basic comparisons without any cost, making it accessible to casual users and small projects.
Integration Options
It provides API access for integrating with other applications or automating file comparison tasks, which can be very useful for developers.

Internet Dependency
As a web-based service, DiffNow requires an active internet connection, which can be a limitation in environments with poor or restricted connectivity.
Feature Limitations in Free Version
The free version may not include advanced features available in premium plans, such as larger file size limits and additional comparison options.
Privacy Concerns
Uploading files to a third-party service may raise privacy or security concerns for sensitive data, as it involves sharing content over the internet.
Performance with Large Files
Comparing very large files or directories might result in slower performance or require a subscription, impacting its usability for large-scale projects.

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Ediff is an excellent, mature interactive tool for comparing and merging files and buffers within Emacs, offering a powerful and highly customizable diff/merge experience for users already invested in the Emacs ecosystem.

Provides intuitive side-by-side and stacked comparison of two or three files with clear visual highlighting of differences
Supports interactive merging with conflict resolution, ideal for version control workflows
Integrates seamlessly with Emacs, version control systems, and patch files
Highly customizable with extensive keybindings and configuration options
Free and open-source software maintained under the GNU project
Can compare files, buffers, directories, and even apply patches

Emacs users who need to compare or merge files and buffers
Developers resolving version control merge conflicts
Programmers reviewing code changes and diffs
Users who prefer keyboard-driven, terminal-friendly workflows
Anyone already working within the GNU/Emacs environment seeking an integrated diff tool