The most useful AI app is the one that solves a job you actually have. Start with visual search, a question with sources, a photo you want to improve, or a language you want to practise. You do not need several overlapping subscriptions to try these tasks.
Updated : Replaced the mixed list of apps and research projects with practical phone tools, task-based choices and clear limits on AI-generated answers and image detail.
Five AI apps and services worth comparing
| Tool | Useful for | Check before relying on it |
|---|---|---|
| Google Lens | Looking up something in a photo, copying text, or translating a sign | Results can misidentify objects or miss small text |
| ChatGPT | Explaining an idea, drafting text, or working through questions | Verify important facts and check the features included in your plan |
| Perplexity | Researching a question with links to sources | Open the cited pages; a citation does not guarantee the answer is right |
| Remini | Trying AI enhancement on a blurry or older photo | New-looking detail may not match the original scene |
| Duolingo | Regular language practice; Max adds supported AI conversation features | Availability depends on the course, device and subscription |
These are starting points for comparison, not a claim that every feature is free or that we tested every app on your phone. Open the developer’s official store link and check its current terms.
1. Use Google Lens for things you can point at
Open Lens through the Google app or another supported Google entry point, then choose a photo or use the camera. Try it on a menu, a product label, or text you would rather copy than type.
The official Lens page describes visual search, translation, and text copying. Check small print yourself, particularly where a mistaken word or number would matter.
2. Use ChatGPT for explanations and drafts
Give the app a specific task: “Explain this setting in plain English” is easier to check than “Fix my phone.” Add your device model or paste only the relevant text. Review the answer before changing a setting or sending a draft.
Use your own account. If you are comparing paid access for a family or team, our ChatGPT account-sharing guide explains why separate accounts and workspace seats are different from sharing a password.
3. Use Perplexity when you want to inspect sources
Ask a focused question, include a date or product version where it matters, and open the supporting links. Our Perplexity beginner’s guide shows how to check an answer rather than trusting the summary alone.
4. Treat Remini as an editor, not a recovery guarantee
Remini offers enhancement and restoration-style tools. Try a copy of the photo and compare faces, letters, and fine patterns with the original. Sharper output can look pleasing without proving that the new detail was present in the source.
Keep the untouched original. Check upload handling, trial terms, and export options before using personal family photographs or starting a subscription.
5. Check Duolingo’s course support before buying Max
Duolingo Max includes AI-supported conversation features such as Roleplay and Video Call in supported setups. They are different from the ordinary lessons you can already see in the app.
First check whether your language course and device offer the feature. A daily practice habit is more useful than paying for a feature you will not use.
Before installing another AI app
- Check the developer name, permissions, and renewal price.
- Try a non-sensitive example before uploading private documents or photos.
- Compare the output with the source and correct mistakes.
- Check whether your phone already has a suitable built-in tool. For Apple devices, see our Apple Intelligence compatibility checklist.