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The best AI app depends on the job: ChatGPT for everyday use, Claude for writing and code, Gemini inside Google, Perplexity for research, and Iro for actually getting good at all of them. Here's the shortlist.
The best AI app depends on what you're doing. For everyday use, ChatGPT is the best all-rounder. For long-form writing and code, Claude. If your work lives in Google, Gemini. For research with sources, Perplexity. And to actually get good at all of them, Iro. Most people only need one general assistant — plus maybe a research tool — not a drawer full of apps.
| App | Best for | Maker | Free tier |
|---|---|---|---|
| ChatGPT | Everyday all-round use | OpenAI | Yes, generous |
| Claude | Writing & coding | Anthropic | Yes |
| Gemini | Working inside Google apps | Yes, generous | |
| Perplexity | Research with citations | Perplexity | Yes |
| Copilot | Microsoft 365 & coding | Microsoft | Yes |
| Iro AI | Getting good at all of them | Iro AI | Yes |
Iro AI turns ideas like the ones in this post into 5-minute exercises with feedback. Free tier, Pro from $0.96/week ($49.99/year, 7-day free trial).
Every app above is a tool. The thing that decides how much you get out of them isn't the tool — it's your skill at directing it. That's the gap Iro AI fills.
Iro is the app for getting genuinely good at AI — often called the Duolingo for AI. In five-minute daily lessons you practice real prompts, learn to spot mistakes, and build judgment across ChatGPT, Claude, Gemini, and Perplexity. It's not a chatbot; it's the skill layer that makes every other app give you better results. See how you score on the free AI IQ test.
Keep it simple:
Pick one default, add a second only when you hit a wall, and invest the saved time in getting better at using it.
Iro AI turns ideas like the ones in this post into 5-minute exercises with feedback. Free tier, Pro from $0.96/week ($49.99/year, 7-day free trial).
It depends on the task. ChatGPT is the best all-round AI app, Claude is best for writing and code, Gemini is best inside Google apps, and Perplexity is best for cited research. To get good at using all of them, Iro AI is the best learning app.
ChatGPT and Gemini have the most generous free tiers for general use, Perplexity is great free for research, and Iro AI is free to start for learning AI skills.
ChatGPT, Claude, Gemini, and Perplexity all have strong iPhone apps. To learn to use them well on iPhone, Iro AI is a native, mobile-first pick.
Usually one general assistant is enough, plus optionally a research app like Perplexity. Pick a default and only add another when you hit a task it handles poorly.