What is the difference between a prompt library and a prompt grader?

A prompt library stores ready-made prompts you copy. A prompt grader scores a prompt you wrote and rewrites it. PromptMaster is a grader with a prompt of the day and about 30 ready prompts.

Does PromptMaster replace ChatGPT?

No. PromptMaster prepares the prompt. Pro opens ChatGPT or Claude with the rewrite filled in, copies it for Gemini, or shares it to another app. You still send the message there. An API key is optional and only runs the answer inside PromptMaster.

Prompt library vs prompt grader

Prompt library

Apps in this category, including large catalogs such as PromptShelf and local notebooks such as PromptVault, are built for browsing. You pick a profession or a topic, copy a finished prompt, and sometimes fill in a blank. As of October 2026, those two were free to use, with ads or an optional tip rather than a rewrite of your own draft. They are the right tool when you do not yet know what to ask.

Prompt wizard

A wizard walks you through role, tone, and format, then assembles a prompt. One Android app also named PromptMaster (package com.votreom.promptmaster, not this app) did that and offered a one-time unlock around $2.99, with ads, and an optional Gemini key. Copy worked without a key. It does not score a prompt you already wrote.

Streak coach

A coach teaches prompting with a daily streak. The one reviewed in October 2026 sold a subscription: about $4.99 a month, or $29.99 a year with a trial shown on the yearly plan. That is a course. It is a different product from a grade of the prompt in your clipboard.

PromptMaster (this app)

Paste your draft and get a score plus the flaws.
Pro unlocks the full rewrite, copy, and send to ChatGPT, Claude, Gemini, or the share sheet.
Prompt of the day and six job starters are on the home screen.
About 30 ready prompts, with variables, live under Prompts.
Saved and History keep what you graded.
Five grades are free. No API key is required to see the score.

Getting the prompt into the chat

A library still ends at copy. The phone clipboard is a poor place to keep a prompt when you switch between ChatGPT, Claude, and Gemini. PromptMaster Pro opens ChatGPT and Claude with the rewrite filled in. Gemini does not accept that kind of link, so the Gemini button copies the text and opens the app. More hands the same text to any app on the Android share sheet. None of the library, wizard, or coach apps above pair that handoff with a grade of the draft you wrote.

Use a library when you want a starting point. Use PromptMaster when you already have a draft and want to know why the answer will be vague.

Prices and features of other apps change. This page describes what was on those Android apps in October 2026.

How to grade a prompt · Send it to a chat app · What is free