Download Cumbersome: AI API Client App V. 1.24.0
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Cumbersome: AI API Client App V. 1.24.0
by Folding Sky Co
IMPORTANT: Requires your own API keys from OpenAI, Anthropic, Z.ai, Google AI Studio, or OpenRouter. I'm Peter, an indie developer in Portland, Oregon. I built Cumbersome mostly for myself because I - More Info...

Available Since: 2025-10-01
Developer: Folding Sky Co
Seller: Folding Sky Co
Price: 0 USD
Current version: 1.24.0
Last Updated: 2026-01-15

Ratings: 5 out of 5 stars.
Based on 3 reviews. (Rate/Review)
Genre: Productivity
Filesize: 27.77MB
IOS Bundle ID: com.foldingsky.cumbersome
Age Rating: 12+
Languages:

Videos: Cumbersome: AI API Client App Videos

IMPORTANT: Requires your own API keys from OpenAI, Anthropic, Z.ai, Google AI Studio, or OpenRouter.

I'm Peter, an indie developer in Portland, Oregon. I built Cumbersome mostly for myself because I was frustrated with how consumer AI apps actually work. Cumbersome is the manual transmission of AI apps: more complex, but with far greater control.

WHY I BUILT THIS

It's claimed that consumer AI providers like ChatGPT and Claude route requests to cheaper models behind the scenes 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 iOS and macOS app 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.

WHAT YOU GET

— Five providers in one app. OpenAI, Anthropic, Z.ai, Google AI Studio, and OpenRouter. Switch between them mid-conversation or compare responses side by side. (You need to obtain API keys for each that you wish to use.)
— Face/Off Mode generates 3 responses at once and an AI judge picks the best one. Overkill for casual questions, but it makes a real difference when quality matters.
— Full control over model parameters. Temperature, tokens, system prompts, reasoning effort. The same technical controls developers get in official API playgrounds, but on your phone.
— Concurrent chats. Fire off multiple questions across different conversations and let them stream in parallel. A pending queue keeps everything organized.
— Edit any message in your conversation history. Consumer apps lock your context once you send it. Cumbersome lets you remove tangents, fix mistakes, and reshape the conversation.
— Stop and keep. Hit stop on a streaming response and keep everything generated so far. No lost output.
— Rich content support. LaTeX math renders properly. Code blocks have copy buttons. Attach multiple images and files at once (drag-and-drop on Mac).
— Export everything. Copy full conversations, export to JSON, or share deep links to specific chats.
— Native apps for iPhone, iPad, and Mac with iCloud sync. Your conversations stay on your devices and sync through your personal iCloud. I never see your data because it never touches my servers (I don't have any actually).

THE DEAL

The app is free. You pay providers directly for API access. I'm out of the money flow entirely.

One person. No VC money. No growth hacking. Just a tool I wanted to exist.

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