Best Codex Open AI Apps

243+ iOS apps curated and reviewed

4.6 avg rating
20 free apps
Updated July 2026

Out of 243+ codex open ai apps on iOS, 20 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.

Compare top Codex Open AI Apps (July 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1ChatGPTChatGPTFree4.8★ (8.8M)YesYesJul 2026
2Claude by AnthropicClaude by AnthropicFree4.7★ (207K)NoYesJul 2026
3Grok AIGrok AIFree4.9★ (1.3M)NoYesJul 2026
4Mobile IDE for Codex AI GPTMobile IDE for Codex AI GPTFreeNoYesJul 2026
5Google GeminiGoogle GeminiFree4.7★ (2M)NoYesJul 2026
6Perplexity - AI Search & ChatPerplexity - AI Search & ChatFree4.8★ (487K)NoYesJul 2026
7DeepSeek - AI AssistantDeepSeek - AI AssistantFree4.0★ (11K)NoNoJul 2026
8Happy: Codex & Claude Code AppHappy: Codex & Claude Code AppFree4.9★ (967)NoYesJul 2026

Top Picks for Codex Open AI

ChatGPT#1

ChatGPT by OpenAI OpCo, LLC

Your everyday AI assistant
Editor's Choice
📊 Productivity
4.8😊(8.8M ratings)
FreeAdsIn-App Purchases
#1in Productivity
ChatGPT screenshot 1
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ChatGPT screenshot 6

This app provides access to advanced AI capabilities, including text generation, image creation from descriptions, and voice conversations. It offers personalized advice, creative inspiration, and instant answers for various tasks, syncing history across devices.

What We Love

  • 🚀 Powerful and versatile AI assistant
  • 👍 Intuitive and user-friendly interface
  • 🤖 Impressive conversational abilities
  • 💡 Convenient mobile access to ChatGPT

Room to Improve

  • 🐛 Occasional inaccuracies or inconsistencies in responses
  • 🔖 Limited to pre-2021 data, lacking real-time updates
  • 🔒 Concerns about privacy and data usage
Claude by Anthropic#2

Claude by Anthropic by Anthropic PBC

AI assistant for life and work
Strong Contender
📊 Productivity
4.7😊(207K ratings)
FreeIn-App Purchases
#2in Productivity
Claude by Anthropic screenshot 1
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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
Grok AI#3

Grok AI by X Corp.

AI chat & video generation
Worth Considering
📊 Productivity
4.9😊(1.3M ratings)
FreeIn-App Purchases
#3in Productivity
Grok AI screenshot 1
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This AI assistant provides fast, truthful answers and can perform deep web research. It generates striking images and videos from text or voice prompts, and can analyze uploaded content. Engage in conversations with personalized AI companions and access real-time information from X.

What We Love

  • 🚀 Fast and efficient
  • 🔒 Unbiased and ethical
  • 👍 Clean and intuitive UI
  • 🤖 Powerful AI capabilities

Room to Improve

  • 🐛 Occasional errors in responses
  • 🔍 Needs more robust search/history features
  • 🔌 Requires X account for full functionality

More Codex Open AI apps to explore

4
Mobile IDE for Codex AI GPT
Mobile IDE for Codex AI GPT
Mobile IDE for Codex AI GPT
Remote Coding From Anywhere
Free

This app provides a mobile interface for a desktop AI coding environment, allowing developers to edit code, run commands, manage Git, and interact with AI assistants from their iPhone. It enables productive use of idle moments by offering real-time access to projects and a built-in terminal.

Real-time desktop bridgeBuilt-in terminalFull Git support
🛠️ Developer Tools
(0)
freemium
5
Google Gemini
Google Gemini
Google Gemini
Your AI assistant from Google
Free

This AI assistant helps you brainstorm, create content, and simplify complex topics. It integrates with your Google apps to provide personalized assistance, plan trips, and study smarter. Upgrade for advanced features like video generation and deeper research capabilities.

Unlimited prompting with Gemini 3 FlashLive interaction via camera/screen sharingContent creation (mockups, posters, diagrams)
📊 Productivity
(2M)
free with in-app purchases
6
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
(487K)
free with in-app purchases
7
DeepSeek - AI Assistant
DeepSeek - AI Assistant
DeepSeek - AI Assistant
Intelligent AI Assistant
Free

This AI assistant offers free, intelligent help powered by a cutting-edge model. It provides rapid responses and advanced capabilities to enhance problem-solving and daily efficiency.

Intelligent AI assistantPowered by flagship AI modelFaster response times
📊 Productivity
(11K)
free
8
Happy: Codex & Claude Code App
Happy: Codex & Claude Code App
Happy: Codex & Claude Code App
Codex & Claude Code on the go
Free

This app provides a secure mobile interface for AI coding assistants, allowing you to continue sessions and monitor progress from anywhere. It features end-to-end encryption and a zero-knowledge architecture for ultimate privacy. Seamlessly switch between desktop and mobile for uninterrupted AI coding.

Seamless desktop and mobile session continuationPush notifications for AI tasksOffline access to conversation history
🛠️ Developer Tools
(967)
free with in-app purchases
9
Microsoft Copilot
Microsoft Copilot
Microsoft Copilot
Ask AI: Chat & Voice Assistant
Free

This AI assistant helps with a wide range of tasks, from creative projects and everyday questions to work-related needs. It offers natural conversation, visual analysis, and learning tools, making tasks easier and faster.

AI Chat & Voice AssistantAI Image GenerationVisual Image Analysis
📊 Productivity
(402K)
free with in-app purchases
10
Manus - AI Agent & Automation
Manus - AI Agent & Automation
Manus - AI Agent & Automation
Web Dev, Slides, research
Free

This AI agent bridges thought and action by autonomously planning, researching, and delivering finished products on a virtual computer. It handles complex tasks like data analysis, slide deck generation, and media creation, working asynchronously in the cloud and notifying you upon completion.

Autonomous task planning and executionAdvanced data analysis and reportingBoardroom-quality slide deck generation
📊 Productivity
(35K)
free with in-app purchases
11
Canva(캔바): 디자인, 사진편집, 동영상 편집
Canva(캔바): 디자인, 사진편집, 동영상 편집
Canva(캔바): 디자인, 사진편집, 동영상 편집
그래픽 디자인 + 로고 메이커
Free

Create stunning graphics, photos, and videos with an all-in-one platform. Generate videos from text prompts using AI, edit photos with background removal, and design presentations, resumes, and social media content. Collaborate in real-time with extensive templates.

AI video generation from textBackground removerPhoto editing suite
📷 Photo & Video
(3.5M)
free with in-app purchases
12
Kimi - Kimi K3 is Live
Kimi - Kimi K3 is Live
Kimi - Kimi K3 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
13
WhatsApp Messenger
WhatsApp Messenger
WhatsApp Messenger
Simple. Reliable. Private.
Free

Connect with friends and family globally through private messaging and high-quality calls. Share moments, documents, and stay in touch across devices, even on slow connections. Your conversations are secured with end-to-end encryption.

End-to-end encrypted messagingHigh-quality voice and video callsGroup chats and calls
🌐 Social Networking
(18M)
free with in-app purchases
14
Chatbot AI Assistant - Genie
Chatbot AI Assistant - Genie
Chatbot AI Assistant - Genie
AI Chatbot & Image Generator
Free

This AI-powered assistant helps with work, study, and creative projects. It offers advanced chat, image generation and editing, document analysis, and web search capabilities. Get instant insights and create visuals from text descriptions.

Advanced AI ChatbotAI Image GeneratorAI Image Editor
📊 Productivity
(198K)
free with in-app purchases
15
Locally AI by LM Studio
Locally AI by LM Studio
Locally AI by LM Studio
Offline & Private AI Assistant
Free

This app allows you to run powerful AI models directly on your iPhone or iPad without an internet connection. Enjoy complete privacy as no data is collected or sent to servers. It's optimized for Apple devices, offering fast and private AI interactions.

Run AI models offlinePrivate and no data collectionSupports Llama, Gemma, Qwen, and more
📊 Productivity
(1.4K)
paid
16
Chat Smith: AI Chatbot & Agent
Chat Smith: AI Chatbot & Agent
Chat Smith: AI Chatbot & Agent
Study, Writing, Research Agent
Free

This AI assistant offers advanced capabilities for writing, research, and image generation. It leverages multiple powerful AI models to provide deep insights, create content, and simplify tasks. Ideal for students, professionals, and creatives seeking enhanced productivity.

AI Image GeneratorAI Writing AssistantDeep Research with Sources
📊 Productivity
(167K)
free with in-app purchases
17
Google AI Edge Gallery
Google AI Edge Gallery
Google AI Edge Gallery
by Google LLC
Free

Run powerful open-source AI models directly on your mobile device. Experience generative AI offline, privately, and with high performance. Explore features like agent skills, AI chat with reasoning visualization, and image/audio analysis.

On-device LLM executionAgent skills for proactive assistanceAI chat with reasoning visualization
📊 Productivity
(145)
free
18
Genspark AI Workspace
Genspark AI Workspace
Genspark AI Workspace
Autopilot Your Busywork
Free

This AI-powered workspace automates various tasks, from research and content generation to coding and presentation creation. It offers tools for drafting documents, building websites, transcribing meetings, and generating images, videos, and audio with simple prompts.

AI-powered research and information gatheringAutomated image, video, and audio generationAI-assisted presentation and document drafting
📊 Productivity
(3.8K)
free with in-app purchases
19
Omnara: Claude & Codex Mobile
Omnara: Claude & Codex Mobile
Omnara: Claude & Codex Mobile
Claude Code & Codex on the go
Free

Control your AI coding agents from your phone. Monitor, steer, and approve live AI coding sessions in real time, anywhere. Supports Claude Code and Codex, with features like voice coding and live localhost previews.

Mobile control for AI coding agentsClaude Code & Codex supportSeamless cloud sync & local handoff
🛠️ Developer Tools
(20)
free with in-app purchases
20
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
(4.4K)
free with in-app purchases

FAQ about Codex Open AI

What are the best codex open ai apps for iPhone?
ChatGPT tops our codex open ai apps ranking as of July 2026, with a 4.8-star average from 8.8M App Store ratings, and it's free to download.
Yes — 20 of the top codex open ai apps we rank are free to download, including ChatGPT and Claude by Anthropic.
ChatGPT shows ads and offers in-app purchases, according to its App Store listing as of July 2026.
We track 243+ codex open ai apps on the iOS App Store as of July 2026, ranked by rating, recency, and analysis of real user reviews.
This app provides access to advanced AI capabilities, allowing users to generate text, create images from descriptions, and engage in real-time voice conversations. It can offer creative inspiration, tailored advice, personalized learning assistance, and instant answers for a wide range of queries.
Key features include generating original images from text descriptions, engaging in advanced voice conversations, uploading photos to transcribe or get information, and receiving creative inspiration or tailored advice. It also supports personalized learning and professional brainstorming.