A Gantt chart drawn from a wish list is decoration: bars that were shortened until they fit the deadline, no dependencies, no float, and a buffer hidden inside every estimate. This AI Gantt Chart Generator turns your AI into a planner that fixes the logic first, computes the critical path instead of guessing it, and tells you plainly when the dates do not fit.
Paste the prompt into Claude, Claude Code, ChatGPT, Gemini or Copilot, describe the project and answer five questions about dates, people and the working calendar, and you get a task table with working day durations, all four dependency types with lags, earliest dates and total float, a named critical path, milestones with verification tests, and a declared buffer. Output comes as a table plus a comma separated block for your spreadsheet and a mermaid gantt block you can render straight away.
One file, one payment, yours forever. Pay once, keep forever, no account, no project software to buy. Reuse it on every launch, migration, build or move.