What is Prompster?
Prompster adds a slash command feature to AI chat applications: by entering / followed by a prompt keyword, you can instantly insert saved prompts into the chat box without switching windows or copying and pasting. It comes with an out-of-the-box library of ready-to-use prompts and enables users to quickly add custom prompts in just two steps, making it ideal for high-frequency scenarios such as writing polish, code review, multilingual translation, and research inquiries. For advanced users, it supports variable placeholders (e.g., [topic]) that dynamically populate content at runtime, and can also incorporate clipboard text, the current date, and other dynamic values, allowing you to build flexible, reusable prompt templates.
Key features
Slash-command prompt insertion: Simply type / followed by keywords directly into the chat box of supported AI chat apps like ChatGPT, Gemini, Claude, and Grok to instantly insert pre-defined prompts.
Variable placeholders and dynamic values supported: You can use [topic]-style placeholders in your prompt templates and fill them with custom content when invoking; it also supports inserting clipboard contents, the current date, and other dynamic values.
Use cases and audience
Users who frequently interact with AI—such as developers, researchers, and content creators—who need to efficiently reuse and customize prompts.
- In mainstream AI chat apps like ChatGPT, Gemini, Claude, and Grok, simply enter / followed by keywords to quickly insert pre-stored prompts while keeping the conversation flowing uninterrupted.
- Create personal shortcuts for repetitive tasks, such as code reviews, research queries, translations, and writing style settings.
- Use prompt templates with variables (e.g., [topic]), combined with dynamic values (such as clipboard content or the current date), to achieve flexible prompt reuse.
User-entered slash commands (e.g., /research), pre-set prompt texts, variable placeholders (e.g., [topic]), and dynamic values (e.g., clipboard contents, dates).
The complete prompt text automatically inserted and expanded within the AI chat interface.
Frequently asked questions
Which AI chat applications does Prompster support?
Supports ChatGPT, Gemini, Claude, Grok, and other popular AI chat applications; see the project homepage for the complete list: https://github.com/LucasAschenbach/prompster#supported-chat-apps
Does it support custom variables and dynamic values?
Supported. You can use variables enclosed in square brackets (e.g., [topic]) in your prompts, filling in specific content when needed; it also supports dynamic values such as clipboard contents and the current date.
How to use
- 01
Install the Prompster extension in the Chrome browser.
- 02
Open a supported AI chat application, such as ChatGPT, Gemini, etc.
- 03
Type / in the chat box to trigger auto-completion, then select a saved prompt keyword.
- 04
After inserting the prompt, you can directly edit variables (e.g., [topic]) and send it.
Official website & sources
Sources
Updated on 2026-10-31
