Do you trust your own thinking? Most people unknowingly fall for the same logical fallacies and cognitive biases every day — in conversations, on social media, in the news, and in their own decisions. Fallacy is the first brain training app built to sharpen one critical skill: your ability to think clearly, spot flawed reasoning, and win any argument with logic.
PEOPLE YOU MEET — OUTSMART REAL-LIFE CHARACTERS
Ever tried reasoning with a WhatsApp Uncle who forwards conspiracy theories? Or an overconfident AI that sounds smart but gets everything wrong? In People You Meet, you go head-to-head with characters inspired by people in your life. Spot their logical fallacies, identify their cognitive biases, plan your comeback, and win arguments using critical thinking instead of volume. Every character uses different reasoning tricks — this brain training mode teaches you more about logic and flawed thinking than any textbook.
MASTER 40+ LOGICAL FALLACIES
From Ad Hominem and Straw Man to the Slippery Slope and Appeal to Authority — master every major logical fallacy through real-world brain training scenarios. Each logical fallacy includes clear explanations, everyday examples, and progressive reasoning challenges that build genuine critical thinking. Whether you encounter these logical fallacies in the news, at work, or in a debate, you will spot them instantly after training.
RECOGNIZE 40+ COGNITIVE BIASES
Confirmation bias. Anchoring. The Dunning-Kruger effect. These invisible cognitive biases shape your decisions every day. Fallacy is the only brain training game that teaches you to detect cognitive biases in yourself and others through hands-on reasoning exercises. Understanding your cognitive biases is the foundation of stronger critical thinking and better decisions.
DEBATE MODE — SHARPEN YOUR REASONING
Step into real debates on real topics. Read opposing arguments, spot the logical fallacies hidden inside, and build powerful reasoning skills. Debate Mode is the ultimate brain training for critical thinking — improve how you argue, evaluate claims, and win debates using pure logic. Every debate round strengthens your reasoning and sharpens your ability to spot cognitive biases under pressure.
CHALLENGE MODE — SPOT BIAS IN REAL NEWSScroll through headlines and posts from real-world news sources. Your mission: spot the flawed reasoning and logical fallacies before time runs out. Challenge Mode is brain training for the real world — building the critical thinking and media literacy skills you need to detect cognitive biases in the news you consume daily.
PRECISION IQ SCORING & PROGRESS TRACKING
Your reasoning ability is measured with a precision IQ score that updates as you train. Track your 30, 60, and 90-day progress. Watch your critical thinking improve with clear insights into your cognitive growth. Brain training works best when you see results — Fallacy shows you exactly how your reasoning improves over time.
DAILY BRAIN EXERCISES & 5 DIFFICULTY LEVELS
Build a daily brain training habit with fresh logic puzzles and reasoning challenges every day. Maintain your streak and strengthen your mental fitness. Five difficulty levels take you from beginner to expert reasoning — keeping brain training challenging no matter your skill level.
WHY FALLACY IS THE SMARTEST BRAIN TRAINING APP
Other brain games train memory or math. Fallacy is the only brain training app focused on logical fallacies, cognitive biases, and real-world critical thinking. From planning a comeback against flawed reasoning to winning debates with logic — this is brain training that makes you smarter in conversations, arguments, and everyday life.
Download Fallacy for free. Start brain training and master the critical thinking skills that actually matter.
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Downloaded this out of curiosity and ended up playing way longer than I planned. Some of the riddles actually make you slow down and rethink your first answer, which I liked. A few levels were easier than others, but overall it feels challenging in a good way. Definitely a solid choice if you enjoy thinking games.
Developer Response
Thanks so much for giving it a try and for sharing this thoughtful feedback, BrooklynKid99!We love hearing that it pulled you in longer than expected — that “wait… let me rethink that” moment is exactly what we’re aiming for. The mix of easier and tougher levels is intentional too, so you can warm up and then really stretch your thinking.Really appreciate you taking the time to write this. More mind-bending challenges are on the way
I actually LEARNED something?!?!
Sorimka
Downloaded, and I’ve always been curious about logical fallacies… but never done the research. I love your app, and it has a Duolingo feel to it, which is high praise. I’ve already gotten through the first 2 lessons and I’ve actually learned something (gasp). Great work!
Developer Response
Hi Sorimka,Thank you so much for taking the time to write this review — it genuinely means a lot to our small team. The "Duolingo feel" comparison is the highest compliment you could give us, because that was exactly the design goal: keep the lessons short, a little addictive, and actually informative by the end.
Great app for time killing!
Boohyys
Interesting, sleek, intuitive app with interesting questions. It would be sticky if user can experience more in the free version. I wanted to see more but was only stopped by the paywall.
Developer Response
Hi Boohyys,Thank you for the thoughtful review — and for the honest feedback on the paywall. This is exactly the kind of constructive note we want to hear.
Fallacy is an interesting concept
Julius CI_ser
In concept, it holds logical reasoning against fallacious assumptions. Debate mode is my main issue. It does not allow you to craft your own reasoning. You choose a topic, which all have a multiple choice debate behind it. It lacks some basic issues (ie, Immigration) and the responses are “mid.” This app needs a chatbot, current news stories, and a pvp function.
Developer Response
hanks for the honest feedback, Julius — we appreciate it.Debate Mode is structured on purpose to help train fallacy recognition first, but we understand it can feel limiting. Expanding topics and exploring more dynamic features like open responses or interactive modes are definitely on our radar.Thanks for helping us improve.
Fixed performance issues for a smoother experience
Still on our mission to make you think sharper
Version 1.5.0
The developer, VERTEX STUDIOS LTD, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
Purchases
Identifiers
Data Linked to You
The following data may be collected and linked to your identity:
Purchases
Contact Info
Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Location
Identifiers
Usage Data
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
VERTEX STUDIOS LTD
Size
127.6 MB
Category
Education
Compatibility
Requires iOS 15.1 or later.
iPhone Requires iOS 15.1 or later.
iPad Requires iPadOS 15.1 or later.
iPod touch Requires iOS 15.1 or later.
Mac Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
