Chatbot for iPhone

The ChatGPT iOS app is best-in-class — voice mode, image input, and a polished interface that sets the bar for AI apps.

ChatGPT is OpenAI's flagship AI assistant, used by hundreds of millions of people worldwide. As of August 2026, Free and Go users default to GPT-5.6 Luna with unlimited text chats, while Plus and Pro users default to GPT-5.5 Instant for everyday chat, with GPT-5.6 Sol as OpenAI's flagship reasoning model for complex work in coding, research, science, and cybersecurity. It handles text, code, image generation, voice conversations, web search, and file analysis — making it one of the most feature-complete general-purpose AI chatbots available. ChatGPT Plus ($20/month) unlocks GPT-5.6 Sol reasoning, and Pro (from $100/month) adds GPT-5.6 Sol Pro with maximum usage.

Claude iOS app has no usage cap on the free tier for most tasks and excels at long documents and nuanced writing.

Claude is Anthropic's AI assistant, built for accuracy, nuance, and careful reasoning. It runs on the Claude 5 model family — Opus 5 for complex analysis and deep research, Sonnet 5 for everyday work, and Fable 5 for extended, multi-step coding and knowledge-work projects — alongside Haiku 4.5 for fast, lightweight tasks. Claude handles text, code, documents, images, web search, and voice, with a 200,000-token context window. It remains the preferred choice for researchers, writers, and developers who prioritize careful, trustworthy output over raw speed.

Perplexity is the standout AI search app on iPhone — cited answers and real-time web access in a clean interface.

Perplexity is an AI-powered search engine that answers questions with cited sources from the live web. Every response links directly to primary sources — making it the most transparent AI assistant for research and fact-checking. Free users get unlimited web searches; Pro ($20/month) unlocks per-query choice among GPT-5.6 Sol, Claude Opus 5, and Gemini 3.1 Pro; Max ($200/month) adds Model Council, which runs a query across all three simultaneously and synthesizes the results.

Microsoft Copilot gives free access to GPT-5.6 on iPhone — no subscription required for the core features.

Microsoft Copilot is an AI-powered assistant designed to enhance productivity by providing support in text generation, image creation, coding assistance, and search functionalities. It is suitable for professionals and creatives looking to streamline their workflows and improve efficiency.

Gemini integrates deeply with Google apps on iPhone — Gmail, Calendar, Search — making it the best option for Google users.

Gemini is Google's AI assistant, now built on Gemini 3.1 Pro and deeply integrated with Google Workspace, Search, and Gmail. It handles text, images, code, audio, and video natively — the broadest multimodal range of any major AI chatbot. Free with a Google account (Gemini 3.6 Flash default); Google AI Plus ($4.99/month) raises usage limits, Google AI Pro ($19.99/month) unlocks full Gemini 3.1 Pro access plus the new Gemini 3.7 Flash (via Spark), and Google AI Ultra ($99.99-$199.99/month) adds the highest usage tiers and Deep Think.