Chrome Extension
Know when your AI conversation needs a fresh start.
ContextVitals reads the ChatGPT or Claude conversation you're already in and estimates how much context pressure it's under — before the model starts losing track.
The problem
Long conversations quietly degrade.
Early instructions fade
The rules you set at the start stop being followed as the conversation grows.
Important context gets buried
Key details get lost under everything that came after them.
Answers start contradicting earlier ones
The model disagrees with a decision it already made.
There's no clear signal to start over
Message count alone doesn't tell you when a conversation has gone stale.
How it works
One badge, four jobs
Context Meter
Live estimates of message count, token usage, and context window pressure, right on the page.
Context Health Score
A single 0–100 risk score, weighing token pressure, instruction decay, topic drift, contradiction risk, and complexity together.
New Session Alerts
A quiet nudge once risk crosses into High Risk — not a popup for every message.
Context Handoff
Generates a continuation prompt — goals, decisions, and next steps — so you can carry the important parts into a fresh chat.
The score
Read it at a glance
Plenty of room left.
Getting long — worth keeping an eye on.
Older instructions and context are under real pressure.
Time to start fresh and carry the important parts over.
Privacy
Built to never see your conversation
Everything runs on your device
Parsing, scoring, and estimates all happen locally in the browser — nothing about your conversation is sent anywhere.
No account, no server
ContextVitals has no backend that your chats pass through.
Every number says "estimated"
ContextVitals can't see a model's real internal context state, so it never claims to — only ever estimates.
Status
What's included
- ChatGPT and Claude support
- Message count and token estimates
- Full Context Health score — token pressure, instruction decay, topic drift, contradiction risk, complexity
- English, Korean, and Chinese UI