Comparison

Ludus vs Interact

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

Head to head
About

Ludus

This app helps you learn new languages faster by automatically creating study decks from pre-loaded dictionaries. It uses a smart spaced repetition system to schedule reviews right before you forget words, ensuring efficient learning and better long-term memory retention.

Highlights
  • Pre-loaded dictionaries
  • Automatic daily review decks
  • Spaced Repetition Scheduler (FSRS)
  • Word definitions and grammar info
  • AI Sentence Generator
  • AI Scan Tool
Features
Read full description

Learn Korean and French from the ground up. Start with grammar, then build vocabulary that sticks past a streak. Ludus teaches you how the language actually works: how Hangul letters build into syllables, how sentences fit together, and why the rules are what they are. Join 2,000+ learners mastering language, one lesson at a time. Stadiums We breaks lesson units down into stadiums, structured paths that take you from your first letters and sounds, step by step. Each stadium is a short run of lessons and activities that builds on the last, so you always know what you've learned and what comes next. Read Hangul New to Korean? Start with the alphabet. Lessons break down consonants and vowels and show how they combine into syllable blocks, and our Character Stroke game lets you practice writing each letter. With regular practice, you can start reading Hangul within two weeks! Understand the language Stop learning random vocabulary that doesn't appear in daily life. Lessons teach foundations and grammar concepts, so you know why something is right instead of guessing. You build real structure first, then add vocabulary on top. Discover 1M+ premade flashcards Search through our built-in dictionaries, read definitions, and save any word in one tap. Saved words join your daily review automatically, so you spend your time learning instead of making flashcards or remaking sets. Reviews are scheduled with FSRS, a spaced-repetition algorithm that adapts to how well you recall each word. Words surface right before you forget them. Games Play live multiplayer games in the classroom, or play solo Gravity and destroy vocab asteroids before they reach the bottom of your screen. There is a way to study for every kind of learner. Starter characters Select from our three starters: Marmunch, Lucifin, and Dribbit! Study vocabulary and go through stadiums to level them up with XP. Complete the fourth stadium lesson to unlock our newly added character Pandit. No ads. No AI tutor. Just lessons and real progress. Subscriptions Ludus Premium unlocks all stadium lessons, languages, and unlimited flashcards. Plans are $7.99 per month or $59.99 per year, and prices may vary by region. Subscriptions renew automatically unless canceled at least 24 hours before the current period ends. Manage or cancel anytime in your Apple ID settings. Terms of Use: https://ludusapp.com/terms Privacy Policy: https://ludusapp.com/privacy-policy Support: admin@ludusapp.com

About

Interact

Features
Read full description

Interact is an educational app for turning the things you want to learn into interactive lessons. Bring all your favorite notes, links, and videos; and turn those into interactives. It's quick and easy to play through flashcards, quizzes, and other types of lessons. The spaced repetition system is built-in so you actually remember what you learn. The idea is to take the things you're already reading, watching, and studying and turn them into something you'll still know months from now. • Create lessons from notes, links, videos, PDFs, photos, and audio • Study with flashcards, fill-in-the-blank, quizzes, typed answers, and image occlusions • Review on a spaced repetition schedule that adapts as you learn • Track your progress across subjects • Continue on the web and your account stays in sync • Share subjects with friends Spaced repetition has been around a long time, but it usually means building all your flashcards by hand. Interact does that part for you, so you can spend your time learning instead of making cards. It's useful whether you're studying for something specific, picking up a new skill, or just trying to hold on to what you read. Interact is free for creating and playing interactives, with a monthly limit on AI-generated lessons. Interact Premium unlocks more capacity and features, available as a monthly or yearly subscription. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula Interact Terms of Service: https://interact.school/terms Privacy Policy: https://interact.school/privacy

Screenshots

Ludus4 screens
Interact4 screens

Verdict

The call

The clearest difference is update cadence: Ludus at weekly against Interact's fortnightly. Ludus also leads on iOS requirement (16.4 vs 26.0). Interact's advantage is device support (4 vs 1). On price, 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. Ludus sells 2 in-app purchases, starting at $7.99 per month and Interact sells 2 in-app purchases, starting at $12.49 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Ludus ships an update weekly, Interact fortnightly. The most recent releases landed on October 25, 2026 and October 10, 2026 respectively.

Scorecard3 real differences · 7 level
Ludus versus Interact: the parameters behind the verdict, then further details
ParameterLudusInteract
PriceFreeFree
Rating4.9 (84 ratings) — better—
Positive reviews88.9% of reviews—
Number of ratings84 — better—
Update frequencyWeekly — betterFortnightly
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhoneiPhone, iPad, Apple TV, Apple Watch — better
Requires iOS16.4 — better26.0
Further details — not scored
Size175 MB31 MB
Age rating4+12+
DeveloperLudus-Language, Inc.Bijan Boustani

In-app purchases

2 purchases

Ludus

Subscriptions2
  • Academic Weapon$7.991 Month
  • Annual Subscription7 Days trial$59.991 Year
2 purchases

Interact

Subscriptions2
  • Premium Monthly7 Days trial$12.491 Month
  • Premium Annual7 Days trial$99.001 Year

Questions

Is Ludus free?
Ludus is free to download, with in-app purchases available.
Is Interact free?
Interact is free to download, with in-app purchases available.
Do Ludus or Interact have ads?
Neither Ludus nor Interact shows ads.
Which is updated more often, Ludus or Interact?
Ludus ships an update weekly, and Interact fortnightly. Most recently, Ludus was updated on October 25, 2026 and Interact on October 10, 2026.

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