You've probably written the same instruction to an AI dozens of times. "Summarize this as five bullet points." "Rewrite this so it's polite enough for a client." "Turn this into a table with these columns." And the best version of each — the wording that finally gave you exactly what you wanted — is lost somewhere in your chat history.
A personal prompt library fixes that. Here's how to build one, from the zero-tool approach to one that works inside every AI you use.
What belongs in a prompt library
Not every prompt is worth saving. The ones that pay off are the ones you repeat:
- Formatting instructions — "answer in a table", "five bullet points, no intro".
- Tone and audience — "rewrite for a non-technical manager", "polite but firm".
- Recurring tasks — meeting notes, weekly reports, code review checklists, email replies.
- Prompts with blanks — the same request with a different client, project or deadline each time.
A good rule: if you've typed it three times, save it.
Option 1: A notes document
The simplest library is a document with a title for each prompt. It costs nothing and works with any AI.
The friction is in using it: open the doc, find the prompt, copy, switch back to the AI tab, paste, edit the parts that change. With more than a handful of prompts, most people stop bothering and retype from memory.
Option 2: Built-in AI settings
ChatGPT's custom instructions, ChatGPT and Claude projects, and Gemini's Gems let you store instructions inside one AI. They're great for things that should apply every time — your language, your role, the tone you like.
They're less useful for task-specific prompts you want to pull in only sometimes, and each one lives in a single AI. If you use ChatGPT, Claude and Gemini, you end up maintaining three copies.
Option 3: A prompt manager that works in every AI
The most convenient library is one you can reach from the chat box you're already typing in. That's what I built Qarta for — a Chrome extension (full disclosure: I'm the developer).
- Type "/" and a keyword in the chat box of ChatGPT, Claude, Gemini, Copilot (personal), Perplexity or Grok, and your saved prompt drops in. Titles and prompt text are both searched.
- One library, six AIs. Edit a prompt once and it's updated everywhere.
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Blanks you fill at send time. Write
{{client}}or{{deadline}}in a prompt, and Qarta asks for just those values before sending (Pro). - Job templates to start from — sales, marketing, planning, admin, engineering and freelance.
- Send one prompt to several AIs at once and compare the answers side by side (Pro).
The free plan holds 10 prompts and every template; Pro ($10/month or $96/year) removes the limit. Your prompts sync through your Chrome profile — they never go to my servers.
Tips for prompts worth reusing
- Name prompts by the job, not the wording. "Weekly report" is easier to find with "/week" than "Summarize the following updates…".
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Put the variable parts in blanks.
{{client}},{{tone}},{{length}}turn one prompt into dozens. - Keep the output format in the prompt. "Answer as a table with columns X, Y, Z" makes results consistent across AIs.
- Prune monthly. Delete prompts you haven't used; your library stays fast to search.
Summary
- A notes doc is a fine start if you have a few prompts and use one AI.
- Custom instructions, projects and Gems are best for always-on preferences.
- If you reuse task prompts across several AIs, a prompt manager in the chat box — like Qarta — saves the most time.
There's also a free library of 72 work prompts you can copy, no install needed: repech.com/qarta/prompts/en.
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