Best Gpt Api App

223+ iOS apps curated and reviewed

4.7 avg rating
20 free apps
Updated June 2026

Whether you're new to gpt api app or looking for an upgrade, our curated collection of 223+ iOS apps has something for everyone. Each app is reviewed and rated by real users, helping you make an informed decision.

Compare top Gpt Api App (June 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1ChatGenius - AI Chat, ChatBotChatGenius - AI Chat, ChatBotFree4.7★ (4.3K)YesYesJul 2026
2Chat Unlimited & Ask Brutus AIChat Unlimited & Ask Brutus AIFree4.6★ (542)YesYesJul 2026
3HTTPBot: API & HTTP ClientHTTPBot: API & HTTP ClientFree4.5★ (1.3K)NoYesJul 2026
4ChatAI - GPT Chat AppChatAI - GPT Chat AppFreeNoJun 2026
5Chat AI PlusChat AI PlusFree4.7★ (1.5K)NoYesJul 2026
6Forms+Forms+Free4.8★ (43K)YesYesJul 2026
7Chatly: AI Chatbot & AssistantChatly: AI Chatbot & AssistantFree4.6★ (2.1K)YesYesJul 2026
8Postmon - Rest API ClientPostmon - Rest API ClientFreeNoNoJul 2026

Top Picks for Gpt Api App

ChatGenius - AI Chat, ChatBot#1

ChatGenius - AI Chat, ChatBot by Ludmila Shcherbachuk

Smart Assistant & AI Writer
Editor's Choice
📊 Productivity
4.7😞(4.3K ratings)
FreeAdsIn-App Purchases
ChatGenius - AI Chat, ChatBot screenshot 1
ChatGenius - AI Chat, ChatBot screenshot 2
ChatGenius - AI Chat, ChatBot screenshot 3
ChatGenius - AI Chat, ChatBot screenshot 4
ChatGenius - AI Chat, ChatBot screenshot 5
ChatGenius - AI Chat, ChatBot screenshot 6

This AI-powered companion utilizes the GPT-5.1 API to offer advanced chatbot interactions, creative writing assistance, and research tools. It also includes code generation, smart editing, and speech-to-text capabilities, making daily tasks more productive and enjoyable.

What We Love

  • 👍 Beginner-friendly
  • 🚀 Impressive AI capabilities
  • 💡 Useful for learning and cognition

Room to Improve

  • 🐛 Frequent errors and bugs
  • 🔒 Lack of customer support and transparency
  • 💰 Expensive subscription with limited functionality
Chat Unlimited & Ask Brutus AI#2

Chat Unlimited & Ask Brutus AI by Aryan Chaurasia

Powered by ChatGPT & GPT API
Strong Contender
📚 Education
4.6😊(542 ratings)
FreeAdsIn-App Purchases
Chat Unlimited & Ask Brutus AI screenshot 1
Chat Unlimited & Ask Brutus AI screenshot 2
Chat Unlimited & Ask Brutus AI screenshot 3
Chat Unlimited & Ask Brutus AI screenshot 4
Chat Unlimited & Ask Brutus AI screenshot 5

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.

What We Love

  • 👍 Intuitive and user-friendly
  • 🚀 Fast and efficient responses
  • 💡 Helpful for various tasks
  • 🔍 Detailed and informative answers

Room to Improve

  • 🐛 Occasional bugs and glitches
  • 💰 Expensive subscription model
  • 🔄 Inconsistent performance
HTTPBot: API & HTTP Client#3

HTTPBot: API & HTTP Client by Arvindh Sukumar

Make Requests, Debug APIs
Worth Considering
🛠️ Developer Tools
4.5😐(1.3K ratings)
FreeIn-App Purchases
#68in Developer Tools
HTTPBot: API & HTTP Client screenshot 1
HTTPBot: API & HTTP Client screenshot 2
HTTPBot: API & HTTP Client screenshot 3
HTTPBot: API & HTTP Client screenshot 4
HTTPBot: API & HTTP Client screenshot 5
HTTPBot: API & HTTP Client screenshot 6

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.

What We Love

  • 🚀 Intuitive interface
  • 👍 Postman integration
  • 🚀 Powerful HTTP client
  • 👍 Great tool for API testing

Room to Improve

  • 🐛 Crashes and bugs
  • 🔒 Lacks security features (e.g., client certificates)
  • 💰 Expensive for the limited free version

More Gpt Api App apps to explore

4
ChatAI - GPT Chat App
ChatAI - GPT Chat App
ChatAI - GPT Chat App
by 1000598199 Ontario Inc
Free
🔧 Utilities
(0)
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
Forms+
Forms+
Forms+
Create Forms & View Responses
Free

Create, edit, and manage Google Forms directly from your iOS device. Utilize templates, import questions, and collaborate with others. View responses in various modes, export data, and receive notifications for new submissions.

Create new formsEdit existing formsImport questions from existing forms
📊 Productivity
(43K)
free with in-app purchases
7
Chatly: AI Chatbot & Assistant
Chatly: AI Chatbot & Assistant
Chatly: AI Chatbot & Assistant
Built on GPT-4o. Chat & Ask AI
Free

This AI assistant leverages advanced GPT technology to help users with a wide range of writing tasks, from crafting marketing materials and speeches to generating social media content and code. It also offers image creation, text summarization, and OCR capabilities.

AI writing assistanceImage creation toolSpelling and grammar editor
📊 Productivity
(2.1K)
free with in-app purchases
8
Postmon - Rest API Client
Postmon - Rest API Client
Postmon - Rest API Client
HTTP API Client
Free

This app allows developers to build and test REST, HTTP, and SOAP APIs directly on their iPhone or iPad. It supports various request methods, authentication types, and body formats, with features for organizing requests and inspecting responses.

HTTP/HTTPS methods (GET, POST, PUT, DELETE, PATCH)Custom query parametersBasic, Bearer/JWT, OAuth authentication
🛠️ Developer Tools
(0)
freemium
9
AI Chatbot - Nova
AI Chatbot - Nova
AI Chatbot - Nova
Ask smart chatbot & Al writer
Free

This AI chatbot and writer leverages advanced GPT and Gemini models to provide human-like conversations, creative writing assistance, and meticulous proofreading. It offers unlimited interactions, multi-language support, and cross-device compatibility for a versatile user experience.

Advanced AI models (GPT-5.2, GPT-4o, Gemini, Claude)Human-like conversational AIAI writing assistant for various content
📊 Productivity
(123K)
free with in-app purchases
10
AI Chat - Instant Chatbot
AI Chat - Instant Chatbot
AI Chat - Instant Chatbot
Build on ChatGPT API & GPT-4
Free

This AI-powered assistant offers advanced chatbot capabilities, image generation, document summarization, and essay writing. It also includes voice communication, language translation, and professional assistance for various tasks, enhancing productivity and creativity.

AI Chatbot for instant answersEssay and creative content generationDocument summarization
📊 Productivity
(1.9K)
free with in-app purchases
11
Teste - API, Scripts, Terminal
Teste - API, Scripts, Terminal
Teste - API, Scripts, Terminal
Developer Workspace
Free

Test various APIs directly from your mobile device. Supports REST, GraphQL, WebSockets, and more, with advanced editors and request customization. Share requests easily and manage cookies and history.

Test REST, GraphQL, WebSocket, SOAP, JSON RPC, XML, HTTP, HTTPS APIsPowerful GraphQL editor with query, mutation, subscription supportWebSocket testing tool for WS and WSS connections
🛠️ Developer Tools
(496)
free
12
My GPT - AI Client
My GPT - AI Client
My GPT - AI Client
Use your own API
Free

This application provides direct access to GPT-powered conversations on your iOS device. Integrate your own API to engage in intelligent chats for creative writing, coding help, or general discussion. Its user-friendly interface simplifies conversation management and API settings.

GPT-powered conversationsIntegrate your own APIUser-friendly interface
📊 Productivity
(1)
free
13
GPT Mobile Phone
GPT Mobile Phone
GPT Mobile Phone
Powered by GPT-4.1 & GPT-4o
Free

This app offers advanced AI-powered assistance for various tasks, including chatting, language learning, writing, and personal assistance. It provides human-like interactions and instant answers, acting as a creative muse and brainstorming partner.

Advanced AI ChatbotLanguage Learning & TranslationWriting Aid & Content Generation
📊 Productivity
(518)
free with in-app purchases
14
Replit: Vibe Code with AI Fast
Replit: Vibe Code with AI Fast
Replit: Vibe Code with AI Fast
Apps, slides, websites, videos
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
(20K)
free with in-app purchases
15
WhatsApp Business
WhatsApp Business
WhatsApp Business
by WhatsApp Inc.
Free

This app offers business tools to help you work smarter, build trust, and grow your customer base. It provides automated messages, organized conversations, and a professional profile to enhance customer interactions and sales.

Automated quick replies and away messagesLabels for conversation organizationProfessional business profile
💼 Business
(1.5M)
free with in-app purchases
16
Rest – HTTP API Client
Rest – HTTP API Client
Rest – HTTP API Client
Perform HTTP Requests
Free

Easily perform HTTP requests directly from your mobile device. Supports various body types, syntax highlighting, and detailed response inspection. Import collections and manage project variables for efficient API testing.

Supports JSON, Form & Multipart bodiesSyntax highlighting and JSON error reportingAll common and custom HTTP methods
🛠️ Developer Tools
(88)
free with in-app purchases
17
Cumbersome: AI LLM API Client
Cumbersome: AI LLM API Client
Cumbersome: AI LLM API Client
API to ChatGPT, OpenAI, Ollama
Free

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 connectionsMulti-provider supportFull parameter control
📊 Productivity
(37)
free
18
Auth app for Tesla
Auth app for Tesla
Auth app for Tesla
Tesla token generator
Free

Generate secure Tesla API authentication tokens with this utility. It allows you to keep custom shortcuts alive by providing token access for third-party services. Your credentials are sent directly to Tesla, and tokens are stored encrypted locally.

Generate secure Tesla API authentication tokensSupport for custom shortcutsConvenient clipboard access to tokens
🔧 Utilities
(20)
free
19
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
20
AI Writer: Email Letter Essay
AI Writer: Email Letter Essay
AI Writer: Email Letter Essay
AI Keyboard, Writing Assistant
Free

This app assists with all your writing needs, from emails and essays to creative content. It offers AI-powered dictation, instant content generation, and a variety of templates to overcome writer's block and enhance your writing.

AI Voice DictationInstant Content GenerationReady-to-Use Templates
🔍 Reference
(6.5K)
free with in-app purchases

FAQ about Gpt Api App

What is the best gpt api app for iPhone?
ChatGenius - AI Chat, ChatBot tops our gpt api app ranking as of June 2026, with a 4.7-star average from 4.3K App Store ratings, and it's free to download.
Yes — 20 of the top gpt api app we rank are free to download, including ChatGenius - AI Chat, ChatBot and Chat Unlimited & Ask Brutus AI.
ChatGenius - AI Chat, ChatBot shows ads and offers in-app purchases, according to its App Store listing as of June 2026.
We track 223+ gpt api app on the iOS App Store as of June 2026, ranked by rating, recency, and analysis of real user reviews.
ChatGenius is an AI-powered companion app for iOS that leverages the GPT-5.1 API. It provides advanced chatbot conversations, assists with creative writing tasks like poetry and social media posts, aids in research by explaining complex concepts, and can generate code in various programming languages. It also features smart editing and speech-to-text functionality.
Key features include interacting with advanced AI bots built on GPT-5.1, generating creative content such as poetry and social media ideas, a dedicated research interface with concept explanations, code generation for developers, a smart editing tool, and speech-to-text capabilities using Apple's Speech framework. It also supports VoiceOver, dark/light modes, and text-to-speech.