ContextCoreby Everything Is 9

Try it free · session compression for AI work

Carry the session. Not the transcript.

Long AI chats bloat, drift and hit their limits. Paste one in and get back a short handoff block: every decision, fix, fact and next step, ready for a fresh chat with any AI. Nothing to install. 5 free runs a day.

Compress a session

Paste a chat, notes or a log. The numbers below are measured on your own text.

0 chars · ~0 tokens

Your handoff block

Your handoff block appears here.
No chat handy? Try the sample.

Private by default. Your text goes to Claude, Anthropic's AI, only to make the block, and ContextCore doesn't store it. Keys and passwords are replaced with [SECRET REMOVED], but read the block before you share it. Want a handoff kept private? Seal it inside a picture with Phantom.

How to use it

  1. Paste

    At the end of a long session, copy the whole chat (or your notes) and paste it here.

  2. Compress

    Decisions, fixes, facts and open questions are kept. Chatter, repeats and dead ends are dropped.

  3. Resume

    Start a fresh chat with any AI and paste the block with the resume prompt. It picks up where you left off.

The format

One tagged line per item, so any AI (or person) can scan it. Decisions are numbered, so a new chat treats them as settled instead of re-arguing them.

@CECS.v1The header: session name and date
>USRWho you are and how you work
>PRJThe project, its version and its state
>DEC[n]Every decision made, numbered, so it isn't re-argued
>FIX[name]What was broken and what it is now
>FACTNames, numbers, settings and paths you'll need again (secrets removed)
>OPEN[n]Questions and bugs still unresolved
>NXT[!!!]Next steps, by urgency

Questions

Is it free?

Yes: 5 runs a day for each visitor, with no account. The line under the headline shows how many you have left today. A run that fails doesn't count.

What happens to my text?

It goes to Claude, Anthropic's AI, only to make the handoff block, which comes straight back to you. ContextCore doesn't store your text or the block. If you sign in, Everything Is 9 keeps your email and token balance, nothing you paste.

Which AI can pick up the handoff?

Any of them: ChatGPT, Claude, Gemini and others. The block is plain text, and "Copy with the resume prompt" adds one line that tells the new chat how to read it.

How much smaller does it get?

It depends on the chat: rambling sessions shrink the most. After each run you see the tokens before and after, counted on your own text (about four characters per token).

How long can the session be?

Up to 60,000 characters, roughly 15,000 tokens. For anything longer, compress it in parts and paste the blocks together.