Cumbersome: AI LLM API Client

IMPORTANT: Requires your own API keys from OpenAI, Anthropic, OpenRouter, Google AI Studio, Z.ai, or Vercel AI Gateway, or your own OpenAI-compatible endpoint. I built Cumbersome because consumer AI apps kept dumbing things down. Cumbersome is the manual transmission of AI apps: more complex, but with far greater control. WHY I BUILT THIS Consumer AI providers like ChatGPT and Claude route requests to cheaper models to keep their costs down. They charge monthly subscriptions whether you use them once or a thousand times. They hide the technical controls that let you tune how models respond. And they lock you into one provider. I wanted an AI client that connects directly to AI provider APIs. I wanted to pick exactly which model I use and know I'm getting it. I wanted to compare different models on the same prompt. I wanted to pay per use instead of subscriptions. So I built it. This is the app I use every day to interact with AI, so I pay attention and try to get it right. SUPPORTED PROVIDERS Bring your API keys, or add your own OpenAI-compatible endpoint, for any of the following: — ChatGPT / OpenAI — Claude / Anthropic — Gemini / Google AI Studio — OpenRouter multi-provider — Vercel AI Gateway multi-provider — Z.ai — OpenAI-compatible custom endpoints, including Ollama, Azure, LM Studio, Groq, Together, and self-hosted backends WHAT YOU GET — A free app. — A versatile API client. One app, every major provider and model. — Total control. Pick your model, tune the parameters, switch providers mid-conversation. — Compare models head to head. Stream multiple chats in parallel and let an AI judge pick the best. — Bring your own tools. Local browser use, reasoning, web search, image generation. — Rich, editable conversations. Markdown, LaTeX, code blocks, attachments, edit and export anything. — Private by design. iCloud sync across devices. Nothing saved to our servers. — Native and accessible on iPhone, iPad, and Mac. MAJOR FEATURES ADDED IN 2026 2026-06-07: Run JavaScript and HTML directly from Cumbersome. 2026-06-04: Pick how OpenRouter processes your PDFs. Free text extraction, OCR, or model-native parsing. 2026-06-04: Choose which web search engine OpenRouter uses. 2026-05-30: Offload oversized and edited messages to iCloud Drive so sync stays fast. 2026-05-12: Configurable Quick Prompt shortcut and App Visibility settings on Mac. 2026-05-09: Conversation folders. Group, move, and organize your chats. 2026-05-03: Collapsible conversation sections in the sidebar, synced across devices. 2026-04-26: Faster native transcript lists on iPhone, iPad, and Mac. 2026-04-22: AI image generation with OpenAI and Gemini. 2026-04-18: Local browser tool use. AI can search and browse pages in your local browser. 2026-04-11: Headless mode. Let the AI work the browser in the background, out of your way. 2026-04-03: Searchable model picker for providers with long model lists. 2026-03-15: Extended thinking and reasoning across providers, including custom endpoints. 2026-03-10: iOS Lock Screen widget. 2026-03-09: Auto-delete conversations after a set number of days. 2026-02-28: OpenAI-compatible custom providers. Connect Ollama, Azure, LM Studio, Groq, and more. 2026-02-25: Only Search When Requested. Smart toggle to keep web search off until you ask. 2026-02-24: Image paste, interactive attachment previews, and PDF thumbnails. 2026-02-21: Siri and Shortcuts integration. 2026-02-20: Vercel AI Gateway provider support, with model exclusion filters. 2026-02-06: Voice Control, Larger Text, color-independent states, and higher contrast. 2026-01-28: Collapse and expand long messages in the conversation view. 2026-01-11: Major accessibility pass. VoiceOver, Dynamic Type, and full keyboard navigation. 2026-01-06: OpenRouter multi-provider integration. THE DEAL The app is free. You pay providers directly for API access. I'm Peter, an indie developer in Portland, Oregon. No VC money. No growth hacking. Just a tool I wanted to exist.