Run
Send a prompt to Gemini on us, or to GPT-5.5 and Claude with your API key. No copying between tab windows.
Gemini · free tier
GPT-5.5 · your key
Claude · your key
Prompt operations for people who ship
Stop paying to rediscover prompts that already worked.
Chat windows bury the version that converted. Prompt Lab is a workspace: run Gemini on us, GPT and Claude on your keys, version every attempt, and diff what changed. Agencies and founders use it so winning copy does not live in a forgotten tab.
Signed in as ·
✓ 20 free Gemini runs / day
✓ No card required to start
✓ Your API keys are never stored
One lab, three models
Features
Everything the chat window isn't.
The business is simple: hosted Gemini gets you in the door, BYO keys keep GPT/Claude costs on the client, and versioning is why they stay. Losing a working prompt is more expensive than ₹749/mo.
Version
Each attempt is saved on your device, so you can step back through history when something worked better yesterday.
Compare
Put two saved versions side by side and see exactly what changed — the tweak that broke it is one glance away.
Your keys stay yours
GPT and Claude run on your own API keys — used once, never stored. Gemini runs through our server on our key, with a fair daily cap.
We never log prompts
We never store keys
Share the ones that finally work
Publish any version as a public link — perfect for posting the prompt that fixed your project, with a one-click "remix it" for anyone who finds it.
Try a share →Who pays for this
Built for people who iterate prompts for money.
Not another toy chat. A lab for work that has to ship.
Agencies & freelancers
Client headlines, ads, and landing copy go through 20 variants. Save the winner, diff the loser, send a share link instead of a screenshot graveyard.
Founders & PMs
Onboarding, support macros, and eval prompts belong in version history — not a private ChatGPT thread nobody else can open.
Builders on a budget
Gemini runs on us so you can iterate without burning your OpenAI bill. Paste your own key only when you need GPT or Claude.
How it works
From idea to working prompt in three steps.
1
Run
Paste a prompt and pick a model. Gemini runs on your free daily allowance — just make an account.
2
Iterate
Change one thing at a time and save every version that does or doesn't work.
3
Compare & share
Diff any two versions to see the exact change that mattered — then publish the winner.
Free playbook
Steal these prompts
Copy-paste starters that already work. Tap one and it opens in the lab, ready to run.
Marketing
Positioning angles
Turn a raw product blurb into 10 positioning angles an expert would fight over.
Run it free →Data
Schema from a sentence
Describe an app in one sentence and get a full Postgres schema with indexes.
Run it free →Writing
From idea to outline
Take a fuzzy idea and get a tight, structured outline ready for a first draft.
Run it free →Engineering
Bug to hypotheses
Paste a bug report and get ranked root-cause hypotheses, not a hand-wavy guess.
Run it free →Careers
Job spec to questions
Turn any job description into senior-level interview questions with what-good looks like.
Run it free →Content
One post, three channels
Recycle one strong idea into a LinkedIn post, a thread, and a newsletter blurb.
Run it free →
20
free Gemini runs per day
500 / 2,000
Pro & Scale runs per day
0
API keys stored
0
prompts logged
Pricing
Start free. Upgrade when you hit the cap.
Pay via UPI (₹) in India or PayPal ($) anywhere in the world.
Free
$0/mo
- 20 Gemini runs per day
- GPT & Claude with your keys
- Local version history & compare
- 3 public prompt shares
Pro
₹749/mo
- 500 Gemini runs per day
- GPT & Claude with your keys
- Unlimited & private prompt shares
- Same lab — more headroom
₹749 via UPI · $9 via PayPal
Scale
₹1499/mo
- 2000 Gemini runs per day
- Everything in Pro
- For heavy daily iterators
- Priority manual activation
₹1499 via UPI · $19 via PayPal
Need a one-time top-up instead?
Bonus Gemini runs that stack on top of your daily limit — no renewal.
200runs
₹199 · $3
600runs
₹499 · $7
1500runs
₹999 · $14
FAQ
Good questions.
Do you store my GPT or Claude API key?
No. Your key is sent to our server only to complete that one request and is never saved. Gemini runs use our own key on the server.
What does the Free plan include?
20 Gemini runs per day at no cost, unlimited versioning and compare, three public shares, and GPT-5.5/Claude with your own API keys.
How do I pay?
Domestically via UPI in INR — no card needed — or internationally via PayPal in USD. Send the amount with the reference shown, and your plan or bonus runs activate as soon as the payment confirms.
What are bonus runs?
One-time run packs that add to your balance and are used up before your everyday limit. They never expire and work on any plan — even Free.
Where are my saved versions stored?
In your browser's local storage on this device. They stay private to you and are never uploaded — only the versions you explicitly publish as shares.
Can I cancel a paid plan later?
Yes. Write to us from the lab and we'll turn it off at the end of your month. No hoops.
Stop restarting the chat.
Start iterating prompts like code — free, right now.