U vs HalluProof
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
U
This app allows teachers to monitor student devices in real-time, share their PC screen, and facilitate file transfers. It also includes annotation tools and group management features for collaborative learning.
- Real-time student device monitoring
- Teacher PC screen sharing
- File transfer between students and teachers
- Annotation and whiteboard functionality
- Student group management
- Remote control of student devices
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HalluProof
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AI is confidently wrong. It cites papers that were never written, invents numbers, and flips relationships backwards. The trouble is that the falsehood sits among true statements. Reading alone won't catch it. HalluProof trains you to find it yourself. β 5β10 minutes a day, with new real-world cases added over time Each day you read a passage written like real AI output and decide for yourself what is false. Once you commit, the hallucinated spans are highlighted, and you see why they are wrong alongside the actual facts and their sources. β Six steps per challenge Judge β Reveal β Think deeper β Learn the pattern β Practise β Insight It doesn't just hand you the answer. You say out loud why you were taken in, and the trick gets filed as a pattern you'll recognise next time. β Seven hallucination patterns Reversed facts Β· Fabricated sources Β· Distorted figures Β· Overstatement Outdated claims Β· Misapplied context Β· Hidden risks and limits Your proficiency is tracked per pattern, so you train the weakest one first. β Practice modes β’ Daily Challenge: one a day, the same for everyone β’ Quick Random: one random challenge β judge it, see the answer β’ Free Study: every day, in any order Daily and random practice are kept apart from your course progress but still count toward your streak. β Habits that outlast the app Where to verify what β scholarly databases for research, medical literature for health, official registries for law. The aim is a habit you use outside the app. β Learn More Links to AI lessons for kids, families and classrooms, and to research and seminar updates for professionals. They open in an in-app browser. β Everything stays on your device No account, no sign-in, no uploads. Lessons work fully offline; a web page opens only when you tap a Learn More link. Your progress never leaves your phone. β Home screen widget Your streak and today's challenge on the Home Screen and Lock Screen. Tap to jump straight in. β iPhone and iPad On iPad, the AI passage and its verification sources sit side by side. This is not an app against using AI. It's an app for using it properly β by learning to doubt it first.
Screenshots
Verdict
The clearest difference is update cadence: HalluProof at every 2 weeks against U's every 4 months. U's advantage is iOS requirement (12.3 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
U ships an update every 4 months, HalluProof every 2 weeks. The most recent releases landed on October 22, 2026 and October 30, 2026 respectively.
| Parameter | U | HalluProof |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | β |
| Update frequency | Every 4 months | Every 2 weeks β better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | β |
| Devices | iPhone, iPad, iPod β better | iPhone, iPad |
| Requires iOS | 12.3 β better | 18.0 |
| Further details β not scored | ||
| Size | 8 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | MIN HO KIM | Hyun-Su Kim |
In-app purchases
U
No in-app purchases
HalluProof
No in-app purchases
Questions
Is U free?
Is HalluProof free?
Do U or HalluProof have ads?
Which is updated more often, U or HalluProof?
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