Your best prompts. On repeat. In Claude, ChatGPT, Perplexity, Grok.
Save the prompts that work as fill-in templates. Fill the blanks, get the same quality answer every time. No rewriting, no guessing.
- Free, no credit card
- Works in Claude, ChatGPT, Perplexity and Grok
- Your answers never reach our servers
Three steps.
Predictable output.
Ad-hoc prompts get ad-hoc answers. A template keeps what works and changes only what should.
- 1
Write it once
Paste a prompt that already works. Mark the parts that change. The rules, context and format that make it good stay fixed.
- 2
Fill the form
Each blank becomes a field: dropdowns, dates, lists, files. You only answer what changes, so nothing important gets lost.
- 3
Run it anywhere
⌘K, Enter, ⌘⇧↵. It opens in Claude or ChatGPT already pasted. Share it as a link and your whole team gets the same quality.
Try it right here. No account.
Six prompts people rerun every week. Change a field and watch the prompt rewrite itself. All six come with your free account.
Critique my landing page
Options insert whole paragraphs, the slider sets how blunt, the toggle adds a section.
Prompt preview
You are a senior product designer. Critique the landing page at https://linear.app. Visitors are developers. They skim, distrust marketing speak and want to see the product and the pricing fast. Focus on: - Visual hierarchy: what does the eye hit first, and is it the right thing? - Call to action: is there one obvious next step on every screen? Be 4/5 blunt (1 = gentle, 5 = brutally honest). Rank issues by how much they hurt conversion. For every copy issue, write a better version I can paste in.
Every rewrite is a new experiment. A template is a recipe.
Prompting from scratch
- Dig up or retype the prompt every time
- Forget the one instruction that made it work
- Output quality swings from run to run
- Every teammate prompts differently
A Blanks template
- ⌘K, type two letters, Enter
- Rules, context and format are locked in
- Same structure, consistent answers
- Share one link, everyone gets the same quality
Questions, answered.
How we handle your data is in the privacy policy.
Is it really free?
Yes. Every feature is free, with no credit card and no trial that runs out.
Does it make AI output deterministic?
No tool can make a model fully deterministic. Blanks removes the biggest source of variation you control: the prompt. Same structure, same instructions, same context on every run, so the answers stay consistent.
What happens to what I type?
Your answers and the finished prompt are built on your device and never sent to Blanks. We only store your templates, plus any preset you choose to save. When you press Open in Claude, the prompt goes straight to Claude, not through us.
Which AIs does it work with?
Claude, ChatGPT, Perplexity and Grok open with your prompt already filled in. For Gemini, Blanks copies the prompt and opens a new tab so you just paste.
Do I need to install anything?
No. It runs in your browser on desktop and phone. Sign in and you're in.
Can I bring my existing prompts?
Paste one in and Blanks spots placeholders like {topic} or [NAME] and offers to turn them into blanks. You confirm each one.
How is this different from a doc full of prompts?
A doc means find, copy and hand-edit every time. Blanks turns the parts that change into a form, and ⌘K, Enter, ⌘⇧↵ opens it in your AI already filled in.
Can I get my prompts out?
Yes. Export your whole library (templates, presets and Blocks) as one JSON file anytime, and import it back whenever you like.
Can I share a template?
Yes. Any template can get a link anyone can fill and open in their AI, no account needed. Your team gets the exact prompt that works for you.
Stop rewriting prompts.
Reuse what works.
Your best prompt, one shortcut away. Free, with nothing to install.
Start free