MockLLM
Local Mock for LLM Apps
Only for Mac
Free · In‑App Purchases
Mac
Debug LLM & Agent apps fully offline — zero token cost, ms latency. Inject faults, replay real traffic, distill contracts; no API key, no telemetry.
MockLLM is a local mock server for LLM and Agent app development. Change one line of baseURL and debug your Agent with ms-level latency, zero token cost, and controlled fault injection. No registration, no API key, zero telemetry — fully offline.
Features:
- Chat Completions & Messages API compatible, with SSE streaming
- Hybrid matching engine: exact, keyword, BM25, fuzzy — configurable thresholds
- L3 Function Call state machine for multi-step tool interactions
- Fault injection: HTTP errors, timeouts, bad JSON, field drift, stream interrupts
- Record & replay: proxy real API traffic, redact keys, replay deterministically
- Contract distillation: convert recorded traces into matching rules
- Completely offline: zero telemetry, no external network required
- Visual editor with real-time matching playground, live request log, and trace browser
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The developer, 昆 张, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
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Information
- Seller
- 昆 张
- Size
- 7.8 MB
- Category
- Developer Tools
- Compatibility
Requires macOS 14.0.0 or later.
- Mac
Requires macOS 14.0.0 or later.
- Mac
- Languages
- English and Simplified Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- MockLLM Pro $19.99
- Copyright
- © Timesong
