ChatExtender
ChatExtender is a macOS desktop application that gives ChatGPT and Claude persistent memory, long conversations that never lose context, and full-text search across every synced conversation. It works alongside a user's own logged-in ChatGPT and Claude accounts, importing threads into a private local workspace stored in SQLite on the Mac. A 7-day free trial is available, and the app is sold as a one-time $30 purchase with no subscription or ChatExtender account required. The app addresses the problem of context compaction in long native LLM chats by automatically handing each new session a complete summary of everything before it. Users can attach reusable memory items—notes, rules, code, schemas, configs, or whole reference files—to any message, and save global collections that travel across ChatGPT and Claude. It also offers full-text search across all threads in a provider, with every match highlighted. ChatExtender is Apple-notarized, requires macOS 13 or later, and keeps all conversation data local and private; no data leaves the Mac. It does not replace ChatGPT or Claude but sits on top of them as a context and memory layer, letting users switch between both models in one workspace.
- Category
- LLM
- Pricing
- Paid
Problem solved
ChatExtender solves the loss of context and memory in long ChatGPT and Claude conversations. Native chats compact and forget details as they grow, and users struggle to find decisions buried across many threads. ChatExtender preserves full conversation history locally, automatically carries summaries into fresh sessions, attaches saved notes and files to prompts, and provides fast full-text search across every synced conversation, so users can continue long-running work without re-explaining context.
Use cases
- Continuing a multi-month coding project across fresh ChatGPT sessions without losing context
- Searching all ChatGPT threads for a specific decision or deadline
- Attaching project files, schemas, and coding style notes to every prompt in Claude
- Maintaining reusable global notes and reference files across ChatGPT and Claude
- Switching between ChatGPT and Claude in one private workspace
- Preserving long research conversations with full scrollback
Audience
- Developers
- ML Engineers
- Data Scientists
- Product Managers
- Content Creators
Pros
- One-time $30 purchase, no subscription
- Local SQLite storage keeps conversations private
- Full-text search across all synced ChatGPT or Claude threads
- Attach notes, files, schemas, and code as reusable memory
- Works with both ChatGPT and Claude in one workspace
Cons
- Only supports macOS 13+
- Limited to ChatGPT and Claude; no other LLM providers
- No cross-device or cloud sync mentioned
- Requires users' own ChatGPT or Claude accounts
Official website: https://chatextender.com/
Canonical LambdaBase page: https://www.lambdabase.com/tools/chatextender