Skip to content
KF
  • About
  • Work With Me
  • Writing
  • Book
  • Tools & Resources
Book a call
  • About
  • Work With Me
  • Writing
  • Book
  • Tools & Resources
  • Book a call

Tools & Resources

Practical tools.

  • All-in: Multi-Turn Conversation Cost Simulator

    Compare API costs across OpenAI, Anthropic, and Gemini side by side. Models real multi-turn billing: every assistant turn re-sends the full prior history as input.

    Open tool →
  • Turn It Down: Cost by Conversation Length Simulator

    See how multi-turn conversation costs compound across OpenAI, Anthropic, and Google. Visualize quadratic cost growth as context re-accumulates each turn.

    Open tool →
  • Saige — macOS app

    A free menu-bar app that shows the live cost of your Claude Code and OpenAI Codex sessions. Reads local transcripts only — no API key, no network. Notarized, universal, macOS 13+.

    Open tool →
Kerstin Frailey

AI & ML Advisor · Author · Cornell PhD

About Work With Me Writing Book

© 2026 Kerstin Frailey. All rights reserved.

✦ ✦ ✦
K
Kerstin
AI assistant

I'd love to keep talking — enter your email and I'll send you a link to continue.

Want me to send this conversation to Kerstin so she can pick it up with you directly?

Powered by AI · may make mistakes · not professional advice