ChatGPT prompts, assistants & agents — tested on OpenAI models.
The Sigrix marketplace for ChatGPT: prompts, personas, assistants, and agents built and tested on OpenAI models. Compare by the job they do, the model they were tested on, and price — then drop them straight into ChatGPT or the API.
Prompts for ChatGPT
Look Good Assistant
A prompt that helps improve appearance through style, grooming, and confidence advice.
Lottery Strategy & Odds Optimizer
Analyze lottery participation rationally and optimize strategy within mathematical limits.
Senior QA Engineer
Answers delegated testing and release-safety questions with a risk-ranked plan: what to test first, what's most likely to break, and the evidence that proves the change is safe.
Software Architect
Answers delegated system-design and performance questions with a specific direction: the smallest design that solves it, the main trade-off it accepts, and the first step to take Monday.
Product Designer
Answers delegated UX, flow, and adoption questions with a concrete design diagnosis and fix: where users struggle, why, and the specific change to ship first.
ScrollStop AI
A short-form hook architect that engineers scroll-stopping opening lines and spoken hooks for Reels, TikToks, Shorts, and social posts — built for creators losing viewers in the first two seconds.
Performance discussions for managers
The summary should help managers conduct effective, respectful, and constructive performance conversations.
AI Tools for Marketing Strategy
Generate a curated list of top AI tools for marketing with use cases, pros/cons, and recommendations.
Build for ChatGPT
Made something great for ChatGPT? Publish it.
Package your prompt, persona, assistant, or agent and list it free or paid — buyers get instant access and you keep the credit. Tag it for ChatGPT and it shows up right here.
About ChatGPT on Sigrix
Buying ChatGPT tools on Sigrix
ChatGPT is OpenAI's conversational AI. Anything on Sigrix tagged for ChatGPT is built to drop into it — a prompt you paste into a chat, a persona or assistant you configure, or an agent you run against the OpenAI API.
Every ChatGPT listing ships as an editable module you own — adapt the instructions to your workflow and reuse it, rather than re-prompting from scratch each time.
Compare ChatGPT tools by the job they do, the OpenAI model they were tested on, their token footprint, and price before you buy.
People searching for ChatGPT prompts and tools usually want something tested and reusable — a module they can drop in and adapt, not another blank prompt box. Popular searches: chatgpt prompts, buy chatgpt prompts, chatgpt prompt marketplace, openai gpt prompts, custom gpt marketplace. Related: gpt-4, openai, ai prompts, ai assistants, prompt marketplace.
Best for
- Writing, editing, and repurposing content at speed
- Custom GPTs and assistants with a consistent voice
- Coding help, data wrangling, and analysis
- Automations that call the OpenAI API
Browse by type
Frequently asked questions
More guides in Sigrix Learn, or read the full buyer & seller FAQ.
Prompts you paste into ChatGPT, personas and assistants you configure for a consistent voice, and agents that run multi-step tasks against the OpenAI API — all built and tested on OpenAI models by independent creators.
Each listing shows the OpenAI model it was tested on (for example GPT-4o or GPT-4.1). Prompts and personas are largely model-portable; the tested model tells you where the creator verified the result.
You own an editable copy of anything you claim on Sigrix, but running it still needs your own ChatGPT access or OpenAI API key. Free listings cost nothing to claim; paid ones show their price on the card.
Usually yes — a prompt is plain text, so it works with any capable model. The listing's tested model is where the creator verified it; results on a different model may vary slightly.