Comparison

AlgoApp vs Thea

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

Head to head
About

AlgoApp

This app helps you learn languages or study for tests using advanced flashcards. It offers automatic translation, text-to-speech, AI-powered PDF conversion, and offline access. Sync your progress across devices and organize your study materials with folders.

Highlights
  • Automatic translation for 120 languages
  • Text-to-speech for 39 languages
  • AI PDF to flashcard conversion
  • Offline study mode
  • Cross-device sync
  • FSRS spaced repetition algorithm
  • Anki deck import
Features
Read full description

Learn languages, or study for school and tests, with the most powerful and user-friendly flashcard app. Millions of language-learners and students have studied over 2 billion flashcards with AlgoApp. Ranked #1 Education app in multiple countries world-wide. Featured in the New York Times. Designed by learning experts, including a published neuroscientist. Whether you're learning a language to live somewhere new or just for fun, need to get through med school, or just want to crush your tests, AlgoApp has already done it for over 5 million people. Why AlgoApp? FOR LANGUAGE LEARNERS • Automatic translation. Make vocab flashcards faster by typing words in the language you know, then AlgoApp translates to the language you're learning (or vice versa). Supports 120 languages including Japanese, Chinese, Korean, English, German, French, and more... • Speaks flashcards to you, in dozens of languages (automatic text-to-speech). Supports 39 languages including Japanese, Chinese, Korean, English, German, French, and more... • Automatically generates furigana annotations for kanji, or pinyin annotations for hanzi. FOR STUDENTS • Converts PDFs directly into flashcards using AI. Upload lecture slides and have a full deck of flashcards ready in seconds. • Prompt AI to make flashcards for you based on text and pictures. Turns handwritten notes and diagrams into flash cards for you. • Format your cards with colored text, bulleted lists, underlines, and more (no CSS needed). • Works offline, so you can study and make cards even when you don't have signal. • Syncs automatically with desktop, web app, and your other phones and tablets. So you can make cards on a computer with a full keyboard, then study on your phone. • Natively supports FSRS, the most-advanced spaced repetition algorithm. • Imports Anki decks (.apkg), AlgoApp (.xml) files, or spreadsheets (.csv). • Supports folders and subfolders, to keep your classes organized. • Notifications tell you when it's time to study (opt-in). • Share decks and study with your friends using Study Groups. • No ads. For the most-dedicated students, try AlgoApp Unlimited free for 7 days. Study as much as you want on all your devices. If you want to upgrade to AlgoApp Unlimited, you can either purchase "Unlimited: 1-Year" which is a 1-year auto-renewing subscription, or "Unlimited: Lifetime" which is a one-time purchase. • Unlimited grants you access to unlimited cross-platform multi-device sync, and more.. • If you choose "Unlimited: 1-Year", the subscription will automatically renew, unless auto-renew is turned off at least 24-hours before the end of the current period. Payment will be charged to your Apple Account within 24-hours before the end of the current period (renewal or trial period). • You can manage your subscription and disable auto-renewal by going to your Account Settings after purchase. Terms of Service: https://www.algoapp.ai/terms.html Privacy Policy: https://www.algoapp.ai/privacy.html

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

AlgoApp4 screens
Thea4 screens

Verdict

The call

The clearest difference is review sentiment: Thea at 93% against AlgoApp's 50%. Thea also leads on rating (4.9 vs 4.7). AlgoApp's advantage is update cadence (every 4 days vs monthly) and ratings volume (20K vs 2.5K). On price, ads, in-app purchases and monetization model 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. AlgoApp sells 4 in-app purchases, starting at $9.99 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. That said, the two scores are not equally well evidenced: AlgoApp has 20K ratings behind it against 2.5K, so its average is the more settled of the two. Written reviews point the same way: 50% of AlgoApp's written reviews are positive against 93% of Thea's.

UpkeepUpdate frequency

AlgoApp ships an update every 4 days, Thea monthly. The most recent releases landed on October 18, 2026 and October 17, 2026 respectively.

Scorecard4 real differences · 6 level
AlgoApp versus Thea: the parameters behind the verdict, then further details
ParameterAlgoAppThea
PriceFreeFree
Rating4.7 (20K ratings)4.9 (2.5K ratings) — better
Positive reviews49.6% of reviews93.0% of reviews — better
Number of ratings20K — better2.5K
Update frequencyEvery 4 days — betterMonthly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, MaciPhone, iPad, iPod, Mac
Requires iOS15.015.0
Further details — not scored
Size51 MB4 MB
Age rating12+12+
DeveloperAlgoApp IncThea Study

Customer experience

AlgoApp

All ratings20,032 ratings
Positive93.2%
Neutral2.3%
Negative4.5%
Written reviews937 reviews
Positive49.6%
Neutral10.9%
Negative39.5%

Thea

All ratings2,459 ratings
Positive97.8%
Neutral0.8%
Negative1.4%
Written reviews500 reviews
Positive93.0%
Neutral3.2%
Negative3.8%

User reviews

AlgoApp

From 20K App Store ratings

What we love

  • 👍 Efficient flashcard creation and review
  • 🚀 Sleek and user-friendly interface
  • 💡 Useful AI-powered features
  • 🚀 Convenient cross-device syncing
  • 👍 Effective spaced repetition algorithm

Room to improve

  • 🐛 Frequent glitches and bugs
  • 🔒 Lack of transparency around paid features
  • 🐛 Syncing and data loss issues
  • 🐛 Unreliable audio playback
  • 🐛 Confusing and unintuitive UI changes

Thea

From 2.5K 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

AlgoApp

Reported bugs

5 issues
  • Cards disappearing from decks
  • Inability to log in or sync across devices
  • Formatting issues when copying/pasting text
  • Inconsistent behavior when editing cards
  • Frequent app crashes and freezes

Requested features

6 requests
  • Ability to edit/customize downloaded decks
  • Option to review cards in creation order
  • Customizable daily study limits
  • Global search across all decks
  • Markdown support and rich text formatting
Show 1 more
  • Improved folder/deck organization tools

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

4 purchases

AlgoApp

Subscriptions3
  • Unlimited: 1-Month$9.991 Month
  • AnkiApp Unlimited$24.991 Year
  • Unlimited: 1-Year$29.991 Year
One-time1
  • Unlimited: Lifetime$149.99
2 purchases

Thea

Subscriptions2
  • Monthly$12.001 Month
  • Yearly$48.001 Year

Questions

Is AlgoApp free?
AlgoApp 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, AlgoApp or Thea?
Thea is rated higher. AlgoApp averages 4.7 out of 5 from 20K ratings, while Thea averages 4.9 from 2.5K ratings.
Do AlgoApp or Thea have ads?
Neither AlgoApp nor Thea shows ads.
Which is updated more often, AlgoApp or Thea?
AlgoApp ships an update every 4 days, and Thea monthly. Most recently, AlgoApp was updated on October 18, 2026 and Thea on October 17, 2026.

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