Prompt Diff
Compare two prompts line by line in your browser. Free, no upload. Private, browser-based developer tool.
Runs locally in your browser. Your input is not uploaded to DevToolMate servers.
Developer Quick Tips
- Press Ctrl or Cmd + Enter to run Prompt Diff after pasting input.
- Token counts are estimates for planning, verify against your model provider.
- Diff prompts locally before sending changes to an external API.
- Explore related tools in the grid below for the next step in your workflow.
Frequently asked questions
Does Prompt Diff upload my data?
No. Prompt Diff on DevToolMate runs locally in your browser. Your input is not uploaded to our servers for processing.
Is Prompt Diff free?
Yes. Prompt Diff is free to use with no account required. Processing stays on your device.
Will my input be stored?
Input stays in memory for the current page. Closing the tab clears it. Theme preference is stored locally in your browser and is not tool input.
Related tools
- Text Diff: Free text diff online tool to compare two texts line by line in your browser. See added, removed, and unchanged lines instantly. No upload, no account.
- Token Counter: Free token counter and content length calculator. Estimate prompt tokens and string length locally in your browser with character, word, and byte counts. No upload, no account.