Your best prompts deserve a home, not a chat log.
PromptDeck turns one-off prompts into a reusable system. Write the context and instructions once, save a few variants, and compare simulated previews before you ever paste anything into a real AI tool.
No sign-up. Data is stored only in this browser via local storage.
Prompt cards, not scattered chats
Capture context, instructions, and expected format once, in a structured card you can find again in seconds.
Compare variants side by side
Save two or more phrasings of the same prompt and preview simulated outputs next to each other before you commit.
Tag and search your library
Organize cards with tags and find them instantly with a fast local search — no more scrolling through history.
Everything stays on your device
Your workspace lives in your browser's local storage. No accounts, no servers, no data leaving your machine.
From a blank idea to a reusable prompt system
The whole journey happens locally in your browser — nothing is sent to a server.
Create a prompt card
Add context, instructions, and the format you expect back.
Add a couple of variants
Try different phrasings or tones for the same underlying task.
Compare simulated previews
See clearly labeled local previews side by side and pick a favorite.
Save it to your library
Tag it, keep it searchable, and reuse it instead of retyping from memory.
Simulated previews, not live AI calls
PromptDeck generates a clearly labeled, local preview of what a formatted response could look like, so you can compare structure and tone across variants. It never calls an external AI provider and never requires an API key.