Your prompt engineering workbench
Version every iteration. Compare diffs side-by-side. Organize with smart tags. The tool you wish existed when you started writing prompts.
The prompt engineer's dilemma
You iterate on prompts all day. But your tools work against you.
Lost iterations
You had a prompt that worked perfectly last Tuesday. But you kept editing and now you can't get back to it. The good version is gone.
No way to compare changes
Did the new system prompt actually improve output quality? Without diffs, you're guessing. A/B testing prompts shouldn't require spreadsheets.
Prompts everywhere, organized nowhere
Some in Google Docs, some in Notion, some in chat history. Your prompt library is scattered across five apps and zero version control.
A home for every prompt iteration
Three features that change how you work with prompts.
Versioned Snippets
Every edit creates a new snippet inside the same note. Your full iteration history lives in one place, always recoverable.
v1 -> v2 -> v3 (each saved, diffable) Visual Diff Comparison
Select any two versions and see exactly what changed — word by word. Understand which edits improved your results.
Compare: v2 vs v5 -> see additions, deletions Smart Tag Organization
AI-powered auto-tagging organizes your library. Hierarchical tags let you build structured taxonomies.
coding/review, writing/blog, persona/expert The iteration workflow
Designed for how prompt engineers actually work.
Write your first version
Start with a rough draft. No pressure — you'll iterate.
Test and refine
Use the prompt, observe results, then save a new version with improvements.
Compare versions
Use the diff view to see what changed between your best and latest versions.
Share or deploy
Share via public link, export as Markdown, or deploy via MCP/CLI/Skills.
Access your prompts from anywhere
Your prompt library follows you across every tool.
Why not just use a notes app?
Notes apps store text. PromptNote manages prompt iteration.
| Feature | PromptNote | Notes Apps |
|---|---|---|
| Per-prompt version history | ✓ | — |
| Side-by-side diff view | ✓ | — |
| AI-powered auto-tagging | ✓ | — |
| MCP + Agent Skills | ✓ | — |
| Built for prompt text | ✓ | — |
| Cross-platform sync | ✓ | ✓ |
What prompt engineers say
"I iterate on prompts 50+ times a day. Having every version saved and diffable isn't a nice-to-have — it's essential."
"The auto-tagging is surprisingly good. I stopped manually organizing and my library is actually more findable now."
"I used to keep prompts in Notion. Switching to PromptNote felt like going from Notepad to VS Code — purpose-built and powerful."
Stop losing your best prompt iterations
Version control for prompts. Free, instant, no signup required.
Frequently asked questions
How many versions can I save per prompt?
Unlimited. Each edit creates a new snippet (version) inside the same note. All versions are kept indefinitely.
Can I export my prompts?
Yes. Export individual prompts or your entire library as JSON or Markdown. Your data is never locked in.
How does the diff view work?
Select any two snippets within a note and see a word-level diff highlighting additions, deletions, and changes.
Does auto-tagging work well?
The AI analyzes your prompt content and suggests tags from your existing tag hierarchy. You can accept, edit, or ignore suggestions.
Can I collaborate with other prompt engineers?
Yes. Share tags with collaborators to create shared prompt collections, or publish individual notes with a public link.