Income Systems Lab
All tools
LLM

ChatGPT

ChatGPT is OpenAI's flagship assistant. With Projects, Custom GPTs, voice mode, and code interpreter, it is the most flexible daily AI co-pilot — strong at reasoning, writing, summarizing, and lightweight coding.

$20/mo
Pairs with: Custom Instructions, Projects
Visit ChatGPT

How to use it

  1. Sign up for ChatGPT Plus ($20/mo) for GPT-5, voice, and file uploads.
  2. Create a Project per client or workstream — keep instructions, files, and chats scoped.
  3. Build a Custom GPT for any task you repeat 3+ times a week (e.g., a 'cold-email rewriter').
  4. Use voice mode for brainstorming on walks; paste the transcript into Notion later.

Who it's for

  • Solo operators who need one assistant for writing, planning, and analysis.
  • Founders who want to ship Custom GPTs as a freebie or paid offer.
  • Anyone replacing 5+ subscription apps with a single AI workspace.

Benefits

  • Largest plugin/GPT ecosystem of any LLM.
  • Reliable voice + multimodal input (images, PDFs, spreadsheets).
  • Memory across chats keeps it personalized over time.

How it fits the stack

ChatGPT is your generalist front door. Use it for ideation, drafting, and quick analysis, then pass complex long-context work to Claude and live research to Perplexity.

Pairs with: Custom Instructions, Projects

Example use cases

Daily inbox triage

Forward emails into a Custom GPT trained on your reply voice; it drafts responses in seconds.

Client deliverables

A 'Brand Voice GPT' loaded with style guides writes first drafts of blog posts and LinkedIn copy.

Spreadsheet analysis

Upload a CSV, ask 'what are the top 3 trends?' and get a chart + summary back.

More in LLM

Claude

Long-context analysis, careful writing, code review

Learn the whole stack — together.

ChatGPT is one of five. The Lab teaches you to wire them into one income system.

See pricing