Comparison

Cogni vs Thea

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Cogni

Create and study flashcards to master new materials efficiently. Utilize an enhanced spaced repetition algorithm to optimize study sessions for exams, languages, or complex subjects. Millions trust this method to achieve their learning goals.

Highlights
  • Create and review custom flashcards
  • Spaced repetition algorithm
  • Pre-made deck library
  • AI-enhanced recall
  • Progress tracking
  • Offline access
Read full description

Cogni empowers you to master new materials effortlessly by creating and studying flashcards. Built on an enhanced spaced repetition algorithm, the app optimizes your study sessions, ensuring you get the most out of your learning. Whether preparing for exams, studying languages, or mastering complex subjects, millions trust flashcards to achieve their goals. Start your journey to mastery today—no limits, no boundaries, just learning! - Languages - Medicine (MCAT, USMLE & More) - Anatomy & Physiology - Exam preparation (SAT, GRE & More) - Math - Law - Geography - Computing - And many more! Key Benefits: - Easily create and review flashcards tailored to your learning needs. - Customize your cards with colors, lists, and more to fit your style. - Access a massive library of pre-made decks to jumpstart your learning. - Review lecture materials and prep for exams with powerful spaced repetition. Thousands of students boost their grades with this science-backed approach. - AI-enhanced spaced repetition (SRS) for optimal recall. - Flexible study interface with swipe and tap actions for efficient learning. - Detailed statistics and progress tracking to monitor your success. - Offline access to study with media-supported flashcards. Get started with Cogni today and take control of your learning journey! Terms of Use: https://www.notion.so/Terms-of-Use-122d703e827a81c89718d91448511266 Privacy Policy: https://www.notion.so/Privacy-Policy-122d703e827a81798c36cf1c20b44220

About

Thea

Transform your course materials into interactive study tools with an AI-powered platform. Upload notes, PDFs, or videos to generate flashcards, practice tests, and summaries. Learn efficiently and master your subjects with personalized study plans.

Highlights
  • AI-powered study material transformation
  • Interactive flashcards and game modes
  • Adaptive learning question generation
  • Practice test simulation
  • Automatic summarization and guide creation
  • Multi-language support
Features
Read full description

Feeling overwhelmed by lecture notes, textbook PDFs, and hours of video content? Stop juggling dozens of apps. Meet Thea.study, the all-in-one AI learning platform that transforms your course materials into powerful, interactive study tools in seconds. Reduce stress and save time with Thea, your smart study partner. We help you master your material efficiently, leaving more time for the things you love. Thea offers a powerful set of AI tools designed for personalized learning and better results. UPLOAD ANYTHING, STUDY INSTANTLY: Get started in seconds. Upload handwritten notes, PDFs, lecture videos, or even paste a YouTube link. Thea's AI extracts the key information and builds your personalized study kit. SMART STUDY: Move beyond rote memorization. Our AI-powered adaptive learning generates questions that focus on your weak spots, getting more challenging as you master the material. MEMORIZE FASTER: Use interactive flashcards and engaging game modes built on a proven spaced repetition system. Perfect for on-the-go learning that makes information stick. TEST WITH CONFIDENCE: Generate practice tests from your study materials to simulate the real exam environment. Build confidence and refine your strategy before exam day. SUMMARIZE & CREATE GUIDES: Instantly distill dense information into concise summaries. Generate comprehensive, downloadable study guides with a single click to simplify your revision process. DESIGNED FOR STUDENTS EVERYWHERE: With support for over 80 languages, you can learn and study in the language you're most comfortable with for better understanding. ACCESSIBLE ANYTIME, ANYWHERE: Thea works seamlessly across your computer, tablet, and smartphone. Your study companion goes wherever you do. A POWERFUL TOOL FOR EDUCATORS: Create classes, assign AI-generated study modules from your own teaching materials, and track student progress with our powerful analytics. Get Started in Seconds! Download Thea today and start achieving better results with less stress! EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms of service: https://www.theastudy.com/termsofservice Privacy policy: https://www.theastudy.com/privacy

Screenshots

Cogni4 screens
Thea4 screens

Verdict

The call

The clearest difference is review sentiment: Thea at 95% against Cogni's 35%. Thea also leads on rating (4.9 vs 4.7) and device support (4 vs 2). Cogni's advantage is update cadence (fortnightly vs monthly). On price, ratings volume, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Cogni sells 9 in-app purchases, starting at $4.99 per month and Thea sells 2 in-app purchases, starting at $12.00 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Thea holds the better App Store score, 4.9 against 4.7. Both are backed by a comparable volume of ratings — 1.7K and 2K respectively. Written reviews point the same way: 35% of Cogni's written reviews are positive against 95% of Thea's.

UpkeepUpdate frequency

Cogni ships an update fortnightly, Thea monthly. Both last shipped on September 23, 2026.

Scorecard4 real differences · 6 level
Cogni versus Thea: the parameters behind the verdict, then further details
ParameterCogniThea
PriceFreeFree
Rating4.7 (1.7K ratings)4.9 (2K ratings) — better
Positive reviews34.9% of reviews95.3% of reviews — better
Number of ratings1.7K2K — better
Update frequencyFortnightly — betterMonthly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod, Mac — better
Requires iOS16.415.0 — better
Further details — not scored
Size62 MB4 MB
Age rating4+12+
DeveloperCOGNIFLY LTDThea Study

Customer experience

Cogni

All ratings1,664 ratings
Positive92.9%
Neutral2.6%
Negative4.4%
Written reviews189 reviews
Positive34.9%
Neutral18.0%
Negative47.1%

Thea

All ratings2,013 ratings
Positive97.8%
Neutral0.8%
Negative1.4%
Written reviews465 reviews
Positive95.3%
Neutral3.0%
Negative1.7%

User reviews

Cogni

From 1.7K App Store ratings

What we love

  • 👍 Great app for memorizing and growing recall skills
  • 🚀 Lifesaver for challenging, memory-heavy subjects like med school
  • 👍 Sleek and user-friendly interface, no distractions

Room to improve

  • 🐛 Locked up referring to an upgrade page, couldn't continue using the app
  • 🐛 Not easy to use, inaccurate for Spanish language
  • 🐛 Desktop flashcards deck won't sync with mobile, forcing duplicate work

Thea

From 2K App Store ratings

What we love

  • 👍 Easy to use
  • 🚀 Helpful AI features
  • 💰 Free version available
  • 📚 Effective for studying and learning
  • 🎓 Useful for AP and nursing exams

Room to improve

  • 🔍 Lack of spaced repetition setting
  • 🔒 Potential for paywalls in the future

Bugs and requests

Cogni

Reported bugs

2 issues
  • App no longer available after paying for annual subscription
  • Occasional crashes

Requested features

4 requests
  • Integrate ChatGPT or Claude for automatic card creation
  • Add sub-decks for larger decks that need more review
  • Improve algorithm for hard/again ratings to better target struggling cards
  • Add subsections for decks to study different sections separately

Thea

Reported bugs

1 issue
  • Answers not mixed up in matching game

Requested features

2 requests
  • Spaced repetition setting
  • More customization options

In-app purchases

9 purchases

Cogni

Subscriptions7
  • Premium Monthly$4.991 Month
  • Premium Monthly$7.991 Month
  • Premium Monthly$14.991 Month
Show 4 more
  • Premium Annual$19.991 Year
  • Premium Annual$24.991 Year
  • Premium Annual3 Days trial$29.991 Year
  • Premium Annual$49.991 Year
One-time2
  • Lifetime Premium$49.99
  • Premium Lifetime$99.99
2 purchases

Thea

Subscriptions2
  • Monthly$12.001 Month
  • Yearly$48.001 Year

Questions

Is Cogni free?
Cogni is free to download, with in-app purchases available.
Is Thea free?
Thea is free to download, with in-app purchases available.
Which has better reviews, Cogni or Thea?
Thea is rated higher. Cogni averages 4.7 out of 5 from 1.7K ratings, while Thea averages 4.9 from 2K ratings.
Do Cogni or Thea have ads?
Neither Cogni nor Thea shows ads.
Which is updated more often, Cogni or Thea?
Cogni ships an update fortnightly, and Thea monthly. Most recently, Cogni was updated on September 23, 2026 and Thea on September 23, 2026.

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