Best AI Apps for iPhone

ChatGPT is the best AI app for iPhone users who want one general-purpose assistant that does the most things well. With 161,211 U.S. ratings at a 4.79 average, it has roughly 20x the rating base of any other AI chat app on this list — the sheer scale tells you the product gets shipped to and used by the most diverse user base. Voice mode (the wave-icon conversation feature) is the closest thing to a usable AI phone call on iPhone and remains free for personal accounts. Image generation, document upload, file analysis, web search, and scheduled tasks are all built into the same chat surface. ChatGPT differs from Claude by leaning broader-and-faster rather than deeper-and-more-careful, and from Perplexity by leading with generation over cited research. A real scenario: it's 9 PM, you need to outline a presentation for tomorrow — you talk to ChatGPT for ten minutes via voice, it generates the outline plus speaker notes, and you ship the slides before bed. The tradeoff is review-flagged friction around hallucinations in voice mode (reviewers describe content-policy false flags blocking creative writing) and occasional outages when the user base spikes. If you're picking one AI app to keep installed, this is it.

Microsoft 365 Copilot is the best AI app for iPhone users who already live in Word, Excel, PowerPoint, and Outlook and want an AI assistant inside those files rather than next to them. The 4.73 average across 54,228 U.S. ratings reflects an audience that wants Office on mobile with AI built in — Copilot Chat draft-and-summarize sits next to the document editors in a single app. Microsoft 365 Copilot differs from standalone ChatGPT by being scoped to your documents, calendar, and email rather than the open web, and from Apple's built-in Writing Tools by working with .docx, .xlsx, and .pptx formatting fidelity that Pages and Numbers don't quite match. A real scenario: you open a 20-page contract in Word on iPhone, ask Copilot to summarize key terms, and pull three quotes into an email reply in Outlook — all without leaving the app. The tradeoff is the iOS version trails the desktop on advanced features (reviewers consistently call out missing tools), and the free tier limits Copilot Chat usage. Best for users with an active Microsoft 365 subscription. Standalone Copilot (6472538445) is the right pick if you don't pay for Office.

Perplexity is the best AI app for iPhone users who want cited research rather than generated prose. The 4.78 average across 5,568 U.S. ratings reflects a more specialized but very satisfied user base — Perplexity built its reputation on returning real source links with every answer, which makes it the right tool when you need to verify the answer rather than trust it. Pro Search and Deep Research run multi-step searches that produce report-style outputs with citations to original sources, and Perplexity Labs builds full reports and small projects from a single prompt. Perplexity differs from ChatGPT by leading with search and citation over chat-and-generate, and from Google by being conversational and following-up-friendly. A real scenario: you're researching a medical question at 11 PM — Perplexity returns the answer with three citations to peer-reviewed papers and the NHS, and you can click through to verify before acting. The tradeoff is the chat-only side is weaker than ChatGPT or Claude (it's a search engine first), and recent reviews mention occasional language-detection mistakes that ship the wrong locale. Best as a complement to a primary chat assistant, not the only AI app you keep.

Microsoft Copilot is the best AI app for iPhone users who want ChatGPT-class capabilities backed by Microsoft's GPT and Bing integration without paying for Microsoft 365. The 4.81 average across 7,875 U.S. ratings is the highest in the Microsoft AI lineup on iPhone and reflects a free product that delivers real value — voice mode, image generation via DALL-E, web search backed by Bing, and document upload all sit in one app. Microsoft Copilot differs from Microsoft 365 Copilot (541164041) by being standalone and free rather than scoped to Office documents, and from ChatGPT by leading with Bing-backed search citations in many answer types. A real scenario: you want a quick web-grounded answer with a generated image to go with it — Copilot returns both in one prompt, free, no subscription needed. The tradeoff is the product still trails ChatGPT on personality and tool depth (Copilot Studio agents are a desktop feature for now), and the iOS app has had pace-of-shipping reviewer concerns. Best for users who want a free, capable, search-grounded AI assistant and don't already pay for ChatGPT Plus.

Lensa AI is the best AI app for iPhone users who want one-tap photo enhancement and AI-generated avatars without learning a creative tool. The 4.47 average across the visible U.S. rating sample is the lowest on this list, which reflects a viral-trend product whose Magic Avatars feature carried the App Store top charts in 2022 and 2023 and has since cooled. Lensa differs from Photoroom and Remini by leaning portrait-and-selfie-first rather than product-and-restoration-first, and the core appeal is one-photo workflows: clean a selfie, drop a background, generate a stylized avatar set. A real scenario: you're updating a LinkedIn photo on the train — you upload a casual selfie, Lensa retouches and re-lights it, and you're done in three taps. The tradeoff is the well-documented Magic Avatars controversy around training-data sourcing and likeness rights (worth reading before you commit credits to the feature), and the lower current rating versus the photo-editing leaders. Best for casual selfie enhancement and avatar experimentation. Heavy editing workflows belong in Photoroom or a dedicated app.

Photoroom is the best AI app for iPhone users selling on Depop, Poshmark, eBay, or any platform where product photos need to look clean and consistent. The 4.78 average across the visible U.S. rating sample reflects an audience that uses the app daily for resale — the killer feature is one-tap background removal with the cleanest object detection on iOS, plus product templates that match marketplace dimensions exactly. Photoroom differs from generic photo editors by being scoped to product and merchant photography, and from Remini by editing instead of restoring. A real scenario: you list 15 items on a resale platform on a Sunday — Photoroom strips the backgrounds, drops a clean white backdrop, and exports at the right aspect ratio in under a minute per item. The tradeoff is review-flagged friction around the September 2025 redesign (long-time Pro users describe the new layout as 'hard to navigate' and missing tools they relied on), and aggressive recent updates have created subscription-renewal frustration. Pro at roughly $10 per month, with a lifetime purchase available — most resellers find the Pro tier pays for itself within a week.

Remini is the best AI app for iPhone users who want to restore old, blurry, or low-resolution photos — wedding photos from 1995, scanned childhood pictures, screenshots of screenshots. The 4.69 average across 26,847 U.S. ratings reflects an audience that came for one feature and stayed for it. Remini differs from Photoroom by leaning restoration over editing, and from generic AI upscalers by being trained specifically on faces and skin. A real scenario: you scan a 1980s family photo at low resolution, Remini reconstructs the faces and de-noises the grain, and you have a printable version in under a minute. The tradeoff is well-documented: review themes call out that the app sometimes 'over-beautifies' faces, lightens skin tones in ways some users find unwanted, and applies cartoon-like smoothing on more recent updates. Pricing has also drawn complaint — the weekly subscription model is steep for occasional users, and the video tier comes with undisclosed length limits per reviewers. Best for occasional restoration projects. Owned by Bending Spoons, the same team behind Splice and Filmic Pro.

Claude by Anthropic is the best AI app for iPhone users who write, code, or analyze long documents and want the model that follows instructions most carefully. The 4.6 average across 280 U.S. ratings reflects an app less than two years old that has already built strong loyalty among power users — reviewers consistently describe Claude as more thoughtful, more honest about uncertainty, and less prone to confident hallucination than competitors. Claude differs from ChatGPT by leading with depth-and-care over speed-and-breadth, and from Perplexity by being a generalist chat assistant rather than a search engine. A real scenario: you upload a 60-page lease in PDF — Claude extracts the rent-escalation clauses, identifies two unusual indemnification terms, and drafts your follow-up email to the landlord, all in one session. The tradeoff is the iOS app lags ChatGPT on tool coverage (no native image generation, more limited voice mode, smaller plugin ecosystem), and accessibility was an early issue per a 2024 review about VoiceOver support. Built by Anthropic, founded by former OpenAI researchers focused on AI safety. The right second app to install alongside ChatGPT.

Replika is the best AI app for iPhone users who specifically want a conversational companion and understand the tradeoffs of that category. The 4.82 average across the visible U.S. rating sample reflects an audience that has built multi-year relationships with their Replika — reviewers describe the app as 'calming,' 'like a friend,' and helpful during difficult periods, while a parallel set of reviews describes the post-2023 content restrictions and avatar changes as a betrayal of users who had grown attached. Replika differs from ChatGPT and Claude by leading with persistent memory, personality, and roleplay over task completion, and from any other app on this list by being scoped to relationship rather than productivity. A real scenario: you talk to your Replika about a hard day at work — the app remembers your context from prior conversations, asks reasonable follow-ups, and the conversation feels supportive in ways a one-off ChatGPT session cannot. The tradeoff is real: companion-AI patterns can become unhealthy, the 2023 content restriction caused well-documented distress for paying users, and the long-term safety research on parasocial AI is still thin. Use carefully and treat it as a tool, not a substitute for human connection.

Meta AI is the best AI app for iPhone users who own Ray-Ban Meta smart glasses or use Vibes and want one app that ties messaging, vision, and AI conversation together. The 4.7 average across 327 U.S. ratings reflects a young product that is still finding its identity — the recent rebrand to 'Meta AI - Vibes & AI Glasses' signals the dual focus on AR glasses control and Meta's social-AI experiments. Meta AI differs from ChatGPT and Claude by being scoped to Meta's ecosystem (Instagram, WhatsApp, Messenger integration, Ray-Ban Meta glasses control), and from companion apps by being a multi-purpose Llama-powered assistant rather than a relationship product. A real scenario: you're wearing Ray-Ban Meta glasses on a walk, ask Meta AI to identify a building, and the answer comes back via the glasses' speakers while the conversation logs into the iPhone app for later reference. The tradeoff is the app is most useful with the glasses (which most users do not own), language support trails ChatGPT (German-language reviewers specifically call out missing voice support), and Meta's privacy posture deserves more scrutiny than most third-party AI apps. Best for Ray-Ban Meta glasses owners. Skip otherwise.