AlgoApp vs Flashside
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
Flashside
Create, study, and master any subject with this free flashcard application. It offers offline access, custom deck creation, and smart review features to enhance learning and retention for students and lifelong learners.
- Create custom flashcards
- Study offline
- Smart review modes
- Multi-subject support
- 100% free, no ads or subscriptions
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Flashside is the flashcard app that plans your learning for you. Make cards for anything — vocabulary, kanji, anatomy, exam questions — and spaced repetition brings each one back at the moment you are about to forget it: after minutes while it is new, then days, then weeks. A few focused minutes a day beat hours of cramming. YOUR PLAN FROM ONE NUMBER Tell Flashside the minutes you have a day and, if you have one, the exam date. It sets the pace, says plainly whether the date is within reach, and every grade button shows when the card will come back. Free for everyone. EXAM PREPARATION • Exam mode: in the last weeks before the date, the deck is drilled until it holds • Quizzes from your own cards, written by hand or generated by AI; the result keeps your answer beside the right one • A memory chart for every collection: how much you would recall today, the last 30 days, and where it goes if you stop • Start a collection over for the next exam without losing its history PERSONALISED LEARNING AI A coach that plans your days, fixes the cards you keep failing and quizzes you before the exam — it never answers for you. • New words come back after a few minutes, and the pause adapts to how well they stick for you • Card doctor: when a card will not stick, it suggests better ways to write it. You pick the fix, or none • A coach card every Monday with what to change this week, and why you missed a card you were sure of • Reminders that move to the hour you actually study Remembering stays your job, because that is the part that makes you learn. EVERYTHING ON YOUR DEVICE Your cards, collections and progress live on your phone. Study on a plane, in the subway, off the grid — no account, no connection, no waiting. Sign in with one tap when you want sync, sharing or the web app at flashside.app, never before. CARDS THE WAY YOU THINK • Rich text, colours, images and audio on both sides, read aloud on request • Flip the direction, shuffle, hold the card to take back an answer • Import ready-made decks from CSV or Excel, paste a list with your own separators, or photograph a page (Plus) • Share whole collections with classmates and friends • Search every card and study from the one you found EARN IT Every session ends on a reward screen: your score, last time's, your streak, and now and then a badge sweeping in. Dozens of badges are hiding in Flashside — for showing up, flawless sessions, mastered collections and a few things you will have to discover. MAKE IT YOURS • Five colour themes, each in light and dark • Clean, fast, distraction-free design • Available in 18 languages LEARNING STAYS FREE Writing and studying cards, the plan, the memory chart, exam mode, syncing and sharing are free, and your cards always belong to you. Flashside Plus is an optional subscription for extras that cost us money to run: natural read-aloud voices, translation, quizzes, the card doctor, importing from a picture and the coach's explanations. Each one is clearly marked, and nothing is charged without your consent. Whether you are learning a language, prepping for med school, collecting kanji or just tired of forgetting names — start with one card today. Your future self will thank you at review time. Terms of Use (EULA): https://flashside.app/eula Privacy Policy: https://flashside.app/privacy-policy
Screenshots
Verdict
The clearest difference is review sentiment: Flashside at 100% against AlgoApp's 50%. Flashside also leads on in-app purchases (none vs 4) and rating (5.0 vs 4.7). AlgoApp's advantage is update cadence (every 4 days vs monthly) and ratings volume (20K vs 2). On price and ads 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
Both are free to download. AlgoApp sells 4 in-app purchases, starting at $9.99 per month. Flashside asks for nothing beyond the download.
Flashside holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: AlgoApp has 20K ratings behind it against 2, 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 100% of Flashside's.
AlgoApp ships an update every 4 days, Flashside monthly. Both last shipped on October 24, 2026.
| Parameter | AlgoApp | Flashside |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (20K ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 49.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 20K — better | 2 |
| Update frequency | Every 4 days — better | Monthly |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 51 MB | 63 MB |
| Age rating | 12+ | 4+ |
| Developer | AlgoApp Inc | CQUELLE GmbH |
Customer experience
AlgoApp
Flashside
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
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- Improved folder/deck organization tools
Flashside
Not enough reviews yet to summarise bugs or requests.
In-app purchases
AlgoApp
- Unlimited: 1-Month$9.991 Month
- AnkiApp Unlimited$24.991 Year
- Unlimited: 1-Year$29.991 Year
- Unlimited: Lifetime$149.99
Flashside
No in-app purchases









