Best Openai Api Apps

235+ iOS apps curated and reviewed

4.7 avg rating
19 free apps
Updated July 2026

If you already know Cumbersome, this is the deeper bench. 235+ openai api apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of July 2026.

Top Picks for Openai Api

Cumbersome: AI LLM API Client#1

Cumbersome: AI LLM API Client by Folding Sky Co

API to ChatGPT, OpenAI, Ollama
Editor's Choice
📊 Productivity
4.9(31 ratings)
Free
Cumbersome: AI LLM API Client screenshot 1
Cumbersome: AI LLM API Client screenshot 2
Cumbersome: AI LLM API Client screenshot 3
Cumbersome: AI LLM API Client screenshot 4
Cumbersome: AI LLM API Client screenshot 5
Cumbersome: AI LLM API Client screenshot 6

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.

Chat API – AI Wrapper#2

Chat API – AI Wrapper by Andres Nunez Soto

Your AI, Your Keys, Your Way
Strong Contender
🛠️ Developer Tools
5.0(4 ratings)
FreeAdsIn-App Purchases
Chat API – AI Wrapper screenshot 1
Chat API – AI Wrapper screenshot 2
Chat API – AI Wrapper screenshot 3
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Access powerful AI models locally or through cloud APIs. This tool offers flexible integration with GPT-4, OpenAI, Grok, and local LLMs for diverse tasks like coding, drafting, and research.

Claude by Anthropic#3

Claude by Anthropic by Anthropic PBC

AI assistant for life and work
Worth Considering
📊 Productivity
4.7😊(193K ratings)
FreeAdsIn-App Purchases
#2in Productivity
Claude by Anthropic screenshot 1
Claude by Anthropic screenshot 2
Claude by Anthropic screenshot 3
Claude by Anthropic screenshot 4
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This AI assistant helps you write, research, code, and solve complex problems. It can analyze documents, code, and images, and even respond to voice commands. Expand your capabilities and tackle new projects with this intelligent thinking partner.

What We Love

  • 🚀 Powerful and versatile AI assistant
  • 👍 Intuitive and easy to use interface
  • 💡 Innovative features like 'Projects'
  • 🤖 Intelligent and thoughtful responses

Room to Improve

  • 🔒 Concerns about privacy and data usage
  • 🚫 Limitations on free usage and throttling
  • 🐛 Occasional bugs and crashes

More Openai Api apps to explore

4
OpenCat - AI Chat, Agent, MCP
OpenCat - AI Chat, Agent, MCP
OpenCat - AI Chat, Agent, MCP
Native AI Utilities
Free

This AI utility tool offers seamless integration of advanced AI models into your daily routine on Mac, iPhone, and iPad. It features a user-friendly interface, keyboard extensions for in-app AI access, and Siri/shortcut integration for automation. Supports a wide range of popular AI models and offers team deployment options.

Support for latest popular AI modelsKeyboard extensions for in-app AIRealistic voice synthesis
📊 Productivity
(833)
free with in-app purchases
5
Chat AI Plus
Chat AI Plus
Chat AI Plus
Powered by ChatGPT OpenAI Api
Free

This app offers advanced AI-powered chat capabilities, leveraging cutting-edge models for insightful responses. It assists with tasks like document analysis, image generation, and voice-to-text conversion, simplifying daily life and boosting productivity.

Advanced AI chat powered by GPT modelsAI-powered document analysis and summarizationAI image generation from text descriptions
📊 Productivity
(1.5K)
free with in-app purchases
6
Liquid Apollo
Liquid Apollo
Liquid Apollo
Fast, private, and reliable AI
Free
$5.99 | 100% OFF

Access a wide range of AI language models, both locally on your device and through cloud APIs. This app allows you to chat with open-source models, connect to your own hosted LLMs, or utilize services like OpenRouter for broad model access.

Local LLM supportOpenRouter integrationCustom backend connections
🔧 Utilities
(533)
free
7
Openchat: AI Chatbot Copilot
Openchat: AI Chatbot Copilot
Openchat: AI Chatbot Copilot
Image, Voice, Text Generation
Free

This AI assistant offers personalized text and voice interactions, helping with tasks like drafting emails, summarizing articles, and brainstorming creative ideas. It supports multilingual communication and includes an AI art generator and interactive games. Users can customize responses and focus on privacy.

Advanced AI AssistantPersonalized ResponsesSmart Task Automation
📊 Productivity
(3.9K)
free with in-app purchases
8
Perplexity - AI Search & Chat
Perplexity - AI Search & Chat
Perplexity - AI Search & Chat
Ask. Research. Trusted Answers
Free

Get accurate, source-backed answers to any question with this AI-powered search and chat tool. It leverages top AI models for deep research, drafting emails, and more, syncing across devices. Discover new information and organize your findings in a personal library.

AI-powered search with cited sourcesDeep research and guided explorationConversational follow-up questions
📊 Productivity
(480K)
free with in-app purchases
9
HTTPBot: API & HTTP Client
HTTPBot: API & HTTP Client
HTTPBot: API & HTTP Client
Make Requests, Debug APIs
Free

This app allows users to send HTTP/HTTPS requests and connect to WebSockets, making it easy to debug APIs on the go. It supports various response formats, collaboration features, and authentication methods, streamlining API development and testing.

Send HTTP/HTTPS and WebSocket requestsInspect JSON, HTML, and XML responsesImport/export Postman collections
🛠️ Developer Tools
(1.3K)
free with in-app purchases
10
Chat Unlimited & Ask Brutus AI
Chat Unlimited & Ask Brutus AI
Chat Unlimited & Ask Brutus AI
Powered by ChatGPT & GPT API
Free

Engage in intelligent conversations with an AI assistant powered by advanced language models and internet search. This app offers a free mode, stores past conversations, and assists with various tasks, learning, and creative endeavors. Enjoy a private and secure chat experience with a user-friendly interface.

AI Chat Bot AssistantOpenAI GPT-4 API integrationInternet Search capabilities
📚 Education
(542)
free with in-app purchases
11
ATOM: GPT Client & AI Chat Bot
ATOM: GPT Client & AI Chat Bot
ATOM: GPT Client & AI Chat Bot
Сhatbot powered by API
Free

This AI-powered chatbot acts as a personal assistant for work, learning, and socializing. It adapts to your conversation context, allowing for natural, multilingual interactions. Its intuitive interface makes accessing advanced AI capabilities easy and convenient.

Personalized AI adaptationNatural language conversation24/7 availability
🔧 Utilities
(2)
free
12
Replit: Vibe Code with AI Fast
Replit: Vibe Code with AI Fast
Replit: Vibe Code with AI Fast
Idea to app, fast
Free

Build and deploy apps, websites, and games directly from your phone. Utilize AI to generate projects from natural language prompts, collaborate in real-time, and host your creations instantly with zero setup. Suitable for both beginners and experienced developers.

Build apps with natural language AIInstant zero-setup hostingReal-time multiplayer collaboration
🛠️ Developer Tools
(19K)
free with in-app purchases
13
Prodigy — AI Chat Assistant
Prodigy — AI Chat Assistant
Prodigy — AI Chat Assistant
Chat with your api key
$3.99

This AI assistant provides a customizable chat experience with access to the latest OpenAI models and image generation capabilities. Users can leverage their own API keys for an ad-free, private interaction, with options for predefined or custom prompts.

Chat with AI modelsImage generationCustomizable prompts
📊 Productivity
(26)
free
14
Postmon - Rest API Client
Postmon - Rest API Client
Postmon - Rest API Client
HTTP API Client
Free
🛠️ Developer Tools
(0)
15
Chatbot AI: AI Chat Assistant
Chatbot AI: AI Chat Assistant
Chatbot AI: AI Chat Assistant
AI Chat & Image Generator
Free

Access multiple advanced AI models, including GPT-5, Claude, Grok, Gemini, and DeepSeek, in a single application. Generate text, create images, get help with tasks, and translate languages with intelligent assistance.

Access to GPT-5, Claude, Grok, Gemini, DeepSeekAI-powered text generationImage generation from descriptions
📊 Productivity
(6K)
free with in-app purchases
16
Kimi - Kimi K2.6 is Live
Kimi - Kimi K2.6 is Live
Kimi - Kimi K2.6 is Live
K2.5·Visual·Agent·Code·Office
Free

This AI-powered agent assists with coding, content creation, and office tasks. It can generate presentations, build websites from designs, and perform complex research with autonomous sub-agents for enhanced efficiency. Handle large documents and detailed conversations with its extensive context window.

Autonomous sub-agent creation for parallel efficiencyCode, create, analyze, and build presentationsAutomate workflows with scheduled tasks and long-term memory
📊 Productivity
(4.7K)
freemium
17
AI Chatbot – Ask AI Anything
AI Chatbot – Ask AI Anything
AI Chatbot – Ask AI Anything
Built on OpenAI ChatGPT GPT-5
Free

This AI-powered writing assistant helps users craft content, generate ideas, and enhance their writing. It offers fast, accurate responses for essays, blogs, business communications, and more, making writing effortless and efficient.

AI Chatbot conversationsContent generation and proofreadingEssay and blog writing assistance
📚 Education
(138)
free with in-app purchases
18
AI Writer Generative AI & Chat
AI Writer Generative AI & Chat
AI Writer Generative AI & Chat
Powered By ChatGPT & GPT-4 API
Free

This AI-powered writing assistant helps you create high-quality, error-free documents quickly. It assists with brainstorming, grammar checks, and rephrasing, functioning as an essay writer, blog generator, and chatbot.

AI-powered writing assistanceGrammar and spelling checksBrainstorming and idea generation
💼 Business
(154)
free with in-app purchases
19
AI Chat Assistant • ChatAI Bot
AI Chat Assistant • ChatAI Bot
AI Chat Assistant • ChatAI Bot
Powered by ChatGPT API & GPT 4
Free

This AI-powered assistant helps with communication, learning, and creativity. It can generate text and images, assist with homework, translate languages, and even help with programming tasks. Get quick answers and improve your writing with this versatile digital companion.

Intelligent conversationImage generation from textEducational assistance
📊 Productivity
(238)
freemium
20
Chat Bolt AI - Open Assistant
Chat Bolt AI - Open Assistant
Chat Bolt AI - Open Assistant
Powered by ChatGPT API & GPT 4
Free

This AI-powered assistant leverages advanced language models to help with writing, research, translation, and coding. It offers features like instant answers, grammar checking, and content generation for various professional and creative tasks.

Instant AI answersAI writing assistanceContent generation
📊 Productivity
(7)
free with in-app purchases