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Cumbersome: AI LLM API Client

Cumbersome: AI LLM API Client

API to ChatGPT, OpenAI, Ollama

35 ratings
13 reviews
📊 Productivity
🛠️ Developer Tools
Free

Details

  • Released
  • Updated
  • October 1, 2025
  • July 12, 2026

Features

Developer

Folding Sky Co
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About

Connect directly to AI provider APIs for greater control over model selection and parameters. Compare different AI models, pay per use, and customize responses with advanced features. Supports multiple providers and custom endpoints.

✓Direct API connections
✓Multi-provider support
✓Full parameter control
✓Face/Off Mode with AI judge
✓Concurrent chats
✓Edit messages
✓Rich content support
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What's New in Cumbersome

1.57.0

July 12, 2026

feat(chat): import conversations from JSON on macOS feat(chat): add Ghost/Write fix(settings): preserve serif font and clarify local preferences fix(latex): pin SwiftDraw below 0.28 to restore equation images fix(chat): label MCP transcript rows as MCP, not local tools perf(chat): cache LaTeX parse/blocks across MarkdownTextView body evals perf(chat): avoid full collapse checks for row identity perf(chat): reduce long-transcript streaming CPU perf(chat): stop idle long-transcript CPU hangs perf(chat): avoid transcript refetches during streaming

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User reviews

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No macOS 15 local search support?

Everything is great except for no macOS 15 local search support. Is this a technical limitation?
Douglas F. WilliamsDouglas F. Williams

Response from developer

Thanks for the feedback. As a one-person development team, I have to balance broader compatibility against development and maintenance time. Local web search currently relies on Apple’s native WebView and WebPage APIs introduced in macOS 26, including support for headless browsing. Supporting macOS 15 would require a substantial second implementation. It was relatively straightforward in 26 with the new APIs from Apple... it would be a heavy engineering lift for legacy support, unfortunately.

优势是免费、手机电脑同步

轻量化、清晰顺滑、免费、接入友好。有几个小缺憾：1. 长文本输入输出的时候有概率出现滑动卡顿、闪屏、显示故障。2. 侧栏 ui 的颜色有些刺眼，对于一个大量阅读的 app 来说最好还是配色风格温和专业一些。3. 添加 provider 之后无法修改，调试换端点稍有点麻烦，但问题不大。
TesethusTesethus

Response from developer

Thanks for the detailed feedback. I will add a theme picker so you can adjust the colors, and I'm working on the scrolling and display glitches. I'll also look into making providers editable.

优势是免费、手机电脑同步

轻量化、清晰顺滑、免费、接入友好，有几个小缺憾：1. 长文本输入输出的时候有概率出现滑动卡顿、闪屏、显示故障。2. 侧栏 ui 的颜色有些刺眼，对于一个大量阅读的 app 来说最好还是配色风格温和专业一些。3. 添加 provider 之后无法修改，调试换端点稍有点麻烦，但问题不大。
TesethusTesethus

Response from developer

Thanks for the detailed feedback. I will add a theme picker so you can adjust the colors, and I'm working on the scrolling and display glitches. I'll also look into making providers editable.

Just the right amount of complexity

Reading the history of this developer (hi, Peter!), I shouldn’t be surprised at how well this app is put together. It integrates complexity very well. It thoughtfully fills gaps between what models offer and clients typically provide. Plus it’s just really (really) fast to start and sync.
john.catalanojohn.catalano

Response from developer

I'm glad someone read the About section on Settings! Thanks for your kind review.

Exactly what I needed

I’ve been using this app since it came out. I’ve long wished for certain features and hoped for continued updates. It’s worked fine, however, the past 5 versions or so have finally given me the features I’ve been waiting for the whole time and it’s amazing. Separate system prompts, chat scoped system prompts,, toggleable parameters, more fixes to the streaming text Views, all the newer OpenRouter backend tool support. He even added COMPACTION! That’s amazing! Thank you so much! Love this app.
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AilthrimAilthrim

Response from developer

Thanks very much for your review! Email us feature requests and bugs... We're continuing to push out code! We also have some novel interfaces that we hope to get to soon.

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FAQ

Does Cumbersome require API keys?

Yes, Cumbersome requires you to bring your own API keys from providers like OpenAI, Anthropic, Google AI Studio, or use an OpenAI-compatible endpoint. You pay the providers directly for API access.

How does Cumbersome compare to subscription AI apps?

Cumbersome offers direct API access, allowing you to choose specific models and pay per use, unlike subscription apps that may route requests to cheaper models and hide technical controls.

What AI providers does Cumbersome support?

Cumbersome supports ChatGPT/OpenAI, Claude/Anthropic, Gemini/Google AI Studio, OpenRouter, Vercel AI Gateway, Z.ai, and OpenAI-compatible custom endpoints like Ollama and Azure.

Can I compare different AI models with Cumbersome?

Yes, Cumbersome allows you to switch providers or AI models mid-conversation and compare different models on the same prompt, giving you direct insight into their performance.

What are the advanced features in Cumbersome?

Features include Face/Off Mode (AI judge picks the best of three responses), extended thinking for model reasoning, full parameter control (temperature, tokens), concurrent chats, and message editing.

Is Cumbersome available on multiple devices?

Yes, Cumbersome is natively available on iPhone, iPad, and Mac, with iCloud sync across devices. Nothing is saved to their servers.

How often is Cumbersome updated?

The latest version is 1.39.0, last updated on March 19, 2026. This indicates a relatively active development cycle for the application.

What is the age rating for Cumbersome?

Cumbersome has an age rating of 17+, suggesting it is intended for mature users due to the nature of AI interactions and potential content.