Supported Features
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VoiceOver
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Voice Control
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Larger Text
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Dark Interface
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Differentiate Without Color Alone
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Sufficient Contrast
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Reduced Motion
Cumbersome: LLM AI API Client
ChatGPT, OpenRouter API Client
Free
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.
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 (beta), including Ollama, Azure, LM Studio, Groq, Together, and self-hosted backends
WHAT YOU GET
— A simple API client.
— Switch providers or AI models mid-conversation.
— iCloud sync across devices. (Nothing saved to our servers.)
— Face/Off Mode. Three responses generated at once. An AI judge picks the best.
— Extended thinking. Turn on model reasoning for OpenAI and OpenRouter.
— Full parameter control. Temperature, tokens, system prompts. API playground controls on your phone.
— Concurrent chats. Multiple conversations streaming in parallel.
— Edit any message. Remove tangents, fix mistakes, reshape your conversation history.
— Rich content. Markdown, LaTeX math, code blocks with copy, attachments.
— Local browser tool use for OpenAI (beta). Open pages with your own device browser context for better compatibility.
— Export everything. Copy conversations, export JSON, or share deep links to specific chats.
— Collapse long messages. Fold them to keep your place in deep conversations.
— Siri and Shortcuts. Ask questions hands-free or build automations in the Shortcuts app.
— Accessible. VoiceOver, Dynamic Type, Voice Control, full keyboard navigation, reduced motion.
— Native on iPhone, iPad, and Mac.
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.
feat(settings): double system message character limit to 10k
fix(ios): preserve show-more position while keeping initial bottom placement
fix(scroll): restore scroll-to-bottom, auto-follow, and geometry-based break detection (iOS and macOS)
The developer, Folding Sky Co, 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 Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
The developer indicated that this app supports the following accessibility features. Learn More
Information
- Seller
- Folding Sky Co
- Size
- 28.7 MB
- Category
- Productivity
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later. - Apple Vision
Requires visionOS 2.0 or later.
- Age Rating
18+
- 18+
- Infrequent
Profanity or Crude Humor
Mature or Suggestive Themes
Horror/Fear Themes
Medical Treatment information
Alcohol, Tobacco, Drug Use or References
Guns or Other Weapons
- Copyright
- © 2026 Folding Sky Co