Now in early access · MVP Live

Stamp it before
it's gone.

Your best AI prompts disappear to the top of the conversation, never to be seen again. StampPrompt is the dedicated journal for the prompts you actually want to keep — timestamped, tagged by platform, and yours forever.

Open the app → Join the Pro waitlist
142 prompts stamped this week · Free forever tier · Works offline
№ 0142 11 · 05 · 26
From Claude
Block game concept brief
Build me a chunky, satisfying block-stacking puzzle game in Godot. Style: warm pastel palette, hand-drawn outlines, juicy haptic feedback on every drop. Mechanic: tetris meets 2048…
— StampPrompt · 09:42 BST —
Archived

Get on the Pro waitlist

Cloud sync, browser extension, unlimited prompts. Be first to try Pro when it ships — no spam, just one email when it's ready.

The problem

Every great prompt deserves a home.

You craft the perfect prompt, get a brilliant response, and then — the conversation rolls on. By tomorrow it's lost in a list of yesterday's chats. StampPrompt is for the prompts worth keeping.

×
Buried in chat history

Tucked between throwaway requests and shopping lists.

×
Locked in one platform

Your Claude prompts live in Claude. Your GPT ones in GPT. Nowhere connects them.

×
No metadata, no context

When did you ask it? What model? Why did it work? Lost.

×
Scattered across screenshots

Your best work, fragmented in your camera roll and Notion scraps.

What it does

One thing, done exceptionally well.

StampPrompt is a single-purpose journal. No bloat, no AI gimmicks layered on top — just a beautifully designed home for the prompts you want to find again.

Timestamped, automatically

Every stamp gets a precise moment — date, time, timezone. Like a postmark, it can't be lost.

Tagged by platform

Claude, GPT, Gemini, Perplexity, Midjourney — keep them organised by where the magic happened.

Search & filter, instantly

Find any stamped prompt by keyword, platform, or date. Even when your archive grows into the thousands.

Export anytime

JSON for backups, Markdown for sharing, plain text for everywhere else. Your data is portable, always.

Works offline

Lives in your browser, not someone's database. No login, no account, no cloud lock-in on the free tier.

Installable as a PWA

Add to home screen on iOS or Android, install on desktop. Behaves like a real app, runs anywhere.

Pricing

Free to start. Pay only when you outgrow it.

Use it locally forever, or upgrade to Pro when you want cloud sync and the browser extension. No tricks, no annual lock-ins.

Free
£0forever

Local-only. Lives in your browser. Yours forever.

  • Up to 30 stamped prompts
  • All platform tags
  • Search & filter
  • JSON & Markdown export
  • Custom themes
  • Installable PWA
Open the app
Coming soon
Pro
£7/ month

Cloud sync, browser extension, unlimited everything.

  • Everything in Free
  • Unlimited prompts
  • Cloud sync across devices
  • Chrome / Edge / Firefox extension
  • Folders & custom tags
  • Priority support
Join the waitlist
Teams
£5/ seat / mo

Shared prompt libraries for studios and agencies.

  • Everything in Pro
  • Shared team collections
  • Admin dashboard
  • Role-based permissions
  • Usage analytics
  • SSO (on request)
Register interest
FAQ

Questions, answered.

Where are my stamps stored?
On the free tier, entirely in your browser using something called IndexedDB — think of it as a small private notebook that lives inside the browser on the device you're using. Your prompts never touch our servers. Nothing is uploaded, nothing is tracked. The trade-off: they live on that browser, on that device. Pro (coming soon) adds optional cloud sync so your archive follows you everywhere.
What if I use multiple devices — Mac, Windows, phone?
Right now, each browser on each device keeps its own archive. Free is deliberately local-first — private, instant, zero-account. Until Pro sync ships, the workaround is the built-in Export button: download your archive as JSON or Markdown, then import it on the other device. Pro (coming soon) removes the manual step entirely — sign in once and your stamps sync across everything.
What if I clear my browser data, or run something like CleanMyMac?
Honest answer: because your archive lives inside the browser, tools that scrub browser data will wipe it too. Same goes for uninstalling the browser, using incognito mode, or switching browsers on the same machine. Two things to know: (1) use the Export button regularly — it takes three seconds and gives you a portable JSON or Markdown file. Treat it like a backup. (2) Pro sync (coming soon) makes this a non-issue — your archive lives in the cloud and re-downloads on any device you sign into.
Does StampPrompt connect to the AI platforms directly?
Not yet. Today, you copy a prompt from your AI tool and paste it into StampPrompt — like a digital scrapbook. A Pro browser extension (coming soon) will add a one-click Stamp button inside Claude, ChatGPT, Gemini and Perplexity, so you can archive prompts without leaving the tab.
What happens to my data if I stop using it?
Nothing — it stays on your device until you clear it. Export to JSON or Markdown anytime. There's no account to delete on the free tier because there's no account to begin with.
Why £7/month for Pro? That seems specific.
It's the price of a single coffee for a month of cross-device prompt sync and the browser extension. Cheaper than Notion, cheaper than the SaaS your team probably already pays for. Honest pricing for an honest tool.
Who's building this?
DNJ Digital — a one-person studio in Andalucía building small, useful tools. StampPrompt is part of a suite that includes True Margin (pricing for makers), ScopeCosts (project quoting), and others. Real human, real care.
Can I use it on mobile?
Yes. It's fully responsive and installable as a Progressive Web App — add it to your home screen on iOS or Android and it behaves like a native app. Works offline once installed.