Chapper: Native iOS Client for LM Studio, Ollama, and OpenAI-Compatible Local Models
Chapper is a native SwiftUI iOS client for connecting to local AI models running on LM Studio, Ollama, and any OpenAI-compatible server. The app runs entirely on-device with no cloud requirements, web views, or mandatory accounts.
Core Features
- Real-time token streaming with live inference speed display
- Full sampling controls: temperature, top-p, top-k, min-p, TFS-Z, repeat/presence/frequency penalty
- Structured output/JSON schema mode
- Markdown rendering with syntax-highlighted code blocks
Reasoning Model Support
- Collapsible thought process panel inline above each response
- Works with Qwen3, DeepSeek-R1, and any model using <think> tags
- Custom <think> tag parser for reasoning model output
Model Management
- In-app model management: browse, load, configure context length
- Flash attention support
- GPU KV-cache offload
Conversation Features
- Personas with persistent system prompts per chat
- Full-text search across all conversations + pinned chats
- Memory system that injects long-term context automatically
- Scratchpad for working notes while chatting
Output Options
- Export in 7 formats: PDF, HTML, Markdown, JSON, CSV, XML, TXT
- TTS in three modes: native iOS voices, local on-device Kokoro model (experimental), or custom TTS server
- Background playback support
Technical Implementation
- Native async streaming over SSE
- MCP tool integration for web search, file access, URL fetching
- iCloud sync (optional)
- On-device analytics dashboard
- 12 language support
- Custom haptics with toggle option
Pricing & Availability
Free + Pro model with one-time purchase, no subscription. Core chat is free. Pro unlocks advanced sampling, unlimited history, all export formats, custom icons, and unlimited personas. Works on iPhone and iPad.
📖 Read the full source: r/LocalLLaMA
👀 See Also
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