ChatExtender

Memory that carries across ChatGPT & Claude · macOS

Free Trial Buy · $30

Keep the context.
Lose the endless thread.

Continue long-running work across fresh ChatGPT and Claude chats, search every synced conversation, and keep the project memory you choose — privately on your Mac.

✓ Apple-notarized Mac app ✓ 7-day free trial ✓ $30 once ✓ Local SQLite storage
ChatExtender
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SYNCED CONVERSATION
Main project
ChatGPT · 1,847 turns
1,847 messages. Eight months. One unbroken thread — every word saved on your Mac, scroll back anytime.
Where were we?
Mid-draft — you wanted the closing section tightened before tomorrow. Ready when you are.
Let's finish it.
+Ask anything↑
One workspace for ChatGPT and Claude. Every thread from both, in a single private app on your Mac — switch models, open a heavy thread, and keep going without losing your place.
ChatExtender
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SYNCED CONVERSATION
Main project
ChatGPT · 2,140 turns
Keep going — we're not close to done.
Picking up exactly where we left off.
This is the moment other AI chats slow down and start forgetting. This one doesn't — a fresh session opens with your full context carried over, automatically.
+Ask anything↑
Starting a new session for faster responses. Your full conversation history is preserved locally.
Context that never silently degrades. Long native chats quietly compact and forget as they grow. ChatExtender hands each new session a complete summary of everything before it — automatically, before anything is lost.
ChatExtender
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SYNCED CONVERSATION
Team update
Claude · today
You know the drill — draft the update.
Matching your saved style and the brief that came attached. Here's a first pass…
Zero re-explaining. What you save once rides along with every message — in ChatGPT and Claude.
📎 My writing style📎 project_brief.md
+Ask anything↑
Memory that travels with you. Save your facts, files, and configs once — ChatExtender attaches them to your messages in ChatGPT or Claude, so the model always has your project's context and you never re-explain it.
ChatExtender
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SYNCED CONVERSATION
Main project
ChatGPT · 1,847 turns
Search, not scrolling. ChatExtender checks every conversation at once — a detail from three weeks ago, forty threads deep, in about a second.
One sec — pulling up something from a few weeks back.
Take your time.
+Ask anything↑
Find any decision in seconds. Full-text search across all your threads in a provider — switch tabs to search the other — with every match highlighted, even one buried thousands of messages back.

Whether you're shipping a project over weeks or researching across dozens of threads, ChatExtender keeps the conversation going — your context never resets.

Buy Now · $30 Start Free 7-day Trial
One-time purchase · No ChatExtender account required · macOS 13+

Questions before you install

Does this replace ChatGPT or Claude?

No. ChatExtender works with your own logged-in ChatGPT and Claude accounts. It adds a private workspace around them for reusable context, cross-session continuity, and local search.

Does ChatExtender upload my conversations?

No. Synced conversations, saved memory, and reference files stay in a local SQLite database on your Mac. Messages still go directly to the provider you choose.

What about ChatGPT Projects and Claude Projects?

They are complementary. Provider Projects organize work inside one service. ChatExtender adds a local layer for searching history, carrying selected context into fresh sessions, and moving between ChatGPT and Claude. See the practical comparison.

What happens during the free trial?

Download the full macOS app and use it for seven days. You do not create a ChatExtender account. If it fits your workflow, the license is a one-time $30 purchase.

What are the requirements?

macOS 13 or newer and your own ChatGPT or Claude account. ChatExtender works with the web chat interfaces and is not a replacement for either subscription. It can also import your Codex and Claude Code session history from your Mac (read-only) and lets those tools search ChatExtender through its built-in MCP server.