LingoBoost vs Skim
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LingoBoost
This app helps users learn and practice foreign language vocabulary through various engaging methods. Create custom lists, mark difficult words, and utilize flashcards, memory games, multiple choice, and typing exercises for effective memorization and spelling practice.
- Custom vocabulary lists
- Flashcards with audio
- Memory game
- Multiple choice quizzes
- Typing practice
- Favorite word marking
- Offline functionality
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Are you struggling to learn vocabulary lists for school? LingoBoost is the perfect app to help you learn and practice foreign languages! Whether you’re learning English, Spanish, French, German, Portuguese, Italian, Chinese, or any other language, this app makes learning vocabulary a lot easier and more fun. Create your own lists: Compile your own vocabulary lists, tailored precisely to your schoolwork. Add words and mark difficult words as favorites so you can practice them extra later. Four effective learning methods: • Flashcards: See a word and memorize the translation. Listen to the pronunciation with the built-in audio function. • Memory: Train your memory with a classic memory game. • Multiple Choice: Test your knowledge with questions and choose the correct translation. • Typing: Practice spelling and memorizing words by typing the translation yourself. Features: • Random Order: The words are presented in random order, so you don't get used to a fixed sequence. • Reversible Languages: Learn words in both directions! Swap the "from" and "to" languages for extra practice. • Instant Feedback: Get immediate feedback on your answers to multiple-choice and typing questions. • Favorites: Mark difficult words and practice them separately. LingoBoost is the ideal free tool for high school students and anyone who wants to learn a new language in a fun and effective way! Download the app today and start learning! The app is free, doesn’t require an account, and works offline. No paywalls or hidden costs.
Skim
Transform documents into bite-sized learning cards with AI. Choose from four learning modes, ask questions about terms, and track your progress. Ideal for students, researchers, and professionals.
- AI-generated learning cards
- Multiple learning modes (Deep Understanding, ELI5, Memorize, Quick Review)
- Ask AI questions about document terms
- Progress tracking (streak, mastery, accuracy)
- Supports PDF, Word, PowerPoint, text, and Markdown
- No ads or data tracking
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Pick how you want to learn: Deep Understanding, ELI5, Memorize, or Quick Review. Skim's AI breaks the document into bite-sized cards in that mode. Upload any document — PDF, Word, PowerPoint, plain text, or Markdown and get tailored cards. Swipe any term to ask Skim about anything unclear, quiz yourself to see what stuck, and track your progress along the way. Same dopamine, actually useful. HOW IT WORKS 1. Upload a PDF, slide deck, doc, or notes 2. Skim's AI breaks it into bite-sized cards — each focused on a single idea 3. Swipe through. Tap any term to ask Skim for a deeper explanation 4. Quiz yourself to see what actually stuck 5. Track your streak and watch your progress unlock GREAT FOR • Students prepping for exams or working through textbooks • Researchers digesting papers and reports • Professionals navigating contracts, briefs, manuals, and decks • Self-learners working through online courses and books • Anyone who's collected docs they meant to read FOUR WAYS TO LEARN • Deep Understanding — comprehensive, concept-first • ELI5 — plain language and analogies • Memorize — quiz-dense, atomic facts for recall • Quick Review — punchlines only, for the refresh ASK SKIM ANYTHING Tap any term in a card for an instant explanation. Or type a follow-up question — Skim's AI assistant stays grounded in what the document actually says, so every answer ties back to your source. TRACK YOUR PROGRESS • Reading streak counter • Card mastery % per document • Quiz accuracy that finds your weak spots • Weekly activity at a glance SUPPORTED FORMATS PDF, PowerPoint (.pptx), Word (.docx), plain text (.txt), Markdown (.md) AI may make mistakes — Skim's cards are reading aids, not authoritative answers. Verify critical information against your source. PRO ($6.99/month or $69.99/year) • Unlimited document processing • 140 AI assistant questions per month ULTRA ($13.99/month or $139.99/year) • Everything in Pro • 280 AI assistant questions per month Cancel anytime in iOS Settings. PRIVACY FIRST No ads. No tracking. No selling your data. Your documents stay yours. Read our full policy at https://tryskim.app/privacy. Privacy Policy: https://tryskim.app/privacy Terms of Use: https://tryskim.app/terms Support: hello@tryskim.app
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Verdict
The clearest difference is rating: Skim at 5.0 against LingoBoost's 2.5. Skim also leads on ads (none vs shown) and update cadence (every 2 weeks vs every 2 months). LingoBoost's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 17.0). On price, ratings volume, 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
Both are free to download. LingoBoost sells 1 one-off in-app purchase and Skim sells 4 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.
Skim holds the better App Store score, 5.0 against 2.5. Both are backed by a comparable volume of ratings — 4 and 3 respectively.
LingoBoost ships an update every 2 months, Skim every 2 weeks. The most recent releases landed on October 2, 2026 and October 7, 2026 respectively.
| Parameter | LingoBoost | Skim |
|---|---|---|
| Price | Free | Free |
| Rating | 2.5 (4 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 4 — better | 3 |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 37 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Stefan Collette | DORUK SAVASAN |
In-app purchases
LingoBoost
- Full Version$0.99
Skim
- Pro Monthly$6.991 Month
- Ultra Monthly$13.991 Month
- Pro Annual$69.991 Year
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- Ultra Annual$139.991 Year









