Comparison

FluentU vs Sentence Lab

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

Head to head
About

FluentU

Learn languages through engaging, real-world videos like movie trailers and music clips. Interactive subtitles and vocabulary quizzes make learning immersive and natural. Connect with culture while mastering a new language.

Highlights
  • Learn with interactive videos
  • Tap words for instant definitions
  • Vocabulary quizzes
  • Bilingual dictionary
  • Track progress
  • Cultural immersion
Features
Read full description

Start your 2-week free trial of FluentU now! Cancel anytime. Tired of boring language learning textbooks? FluentU brings languages to life with real-world interactive videos! Learn to read and speak Spanish, French, English, Mandarin Chinese, German, Japanese, Russian, Korean and Italian with FluentU. FluentU turns music videos, movie trailers, news and inspiring talks into an amazing language learning experience. Experience an immersive education that teaches you to speak and comprehend new languages in a natural way. Now you can learn a new language while connecting with the culture. No matter what your skill level or interest, FluentU has you covered. FLUENTU FEATURES: LEARN A NEW LANGUAGE - Immerse yourself in a foreign language to understand how it’s used - Connect with the language through real-world videos - Quiz yourself on the vocabulary - Learn to speak the language instead of scripted phrases - Stay motivated to learn each day WATCH, LISTEN & LEARN - Put the textbooks away and learn from experience - Watch videos with subtitles and translations to learn the language - Tap on any word or phrase to learn its meaning - Add words to your vocabulary list for review - Listen to audio dialogues to gain an understanding of the language BILINGUAL DICTIONARY - Look up any word and see how it’s used in a sentence - Search content by title or grammar and vocabulary points AVAILABLE LANGUAGES: - Chinese (Mandarin) - English - French - German - Italian - Japanese - Korean - Russian - Spanish WHAT PEOPLE ARE SAYING "Great app. To my knowledge the best on the market. You created something unique and new!" - Felix Wedel "It is more helpful than any other tool I've used. I had been using podcasts before and trying to make flashcards, and that worked pretty well. But it ended up that I was spending more time making the flashcards than studying. FluentU really solves this." - David Brown "FluentU has quickly become one of my favorite language-learning tools. Great job on an aesthetically pleasing app and an incredibly functional one." - Justin Price "This concept in FluentU is amazing. It's such a great way to help you understand a spoken language and the way you break it down is amazing." - Demi Pradolin "This app is so fun and useful - the best Chinese language learning app I've ever used." - Richard Jun PLUS SUBSCRIPTION FluentU is available as a monthly ($29.99 for Plus) or yearly subscription ($239.99 for Plus). If you enjoy FluentU, do nothing and your membership will automatically continue for as long as you choose to remain a member. You can easily cancel anytime, online. Just sign up to get started! If you subscribe via iTunes: Payment will be charged to iTunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Account will be charged for renewal within 24-hours prior to the end of the current period and identify the cost of the renewal. Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Privacy policy: http://www.fluentu.com/privacy/ Terms of Use: http://www.fluentu.com/terms/

About

Sentence Lab

Master Spanish sentence construction with this app. Practice translating English sentences into Spanish, receive instant feedback, and learn from detailed explanations. It uses spaced repetition and offers grammar guides and vocabulary flashcards.

Highlights
  • Translate English to Spanish sentences
  • Instant feedback and explanations
  • Spaced repetition learning
  • Grammar reference guides
  • Travel vocabulary flashcards
  • Detailed progress statistics
  • Offline practice support
Features
Read full description

Sentence Lab helps you build real Spanish fluency by practicing complete sentences, not just flashcards. HOW IT WORKS • See an English sentence • Type the Spanish translation • Get instant feedback • Learn from your mistakes with helpful explanations SMART LEARNING Sentence Lab uses spaced repetition to optimize your learning. Sentences you struggle with appear more often, while mastered content is spaced out for efficient long-term retention. FEATURES • 1,500+ carefully crafted sentences from A1 to C1 level • Spaced repetition that adapts to your progress • Grammar reference guides • Travel vocabulary reference and flashcards • Detailed statistics to track your improvement • Daily streak to keep you motivated • Accent keyboard for easy Spanish character input • Easy mode with word bank for beginners • Custom content creation for premium users • Scenario conversations for premium users • Offline practice support PRACTICE MODES • New Sentences - Learn fresh content • Review - Practice sentences due for review • Mixed - A balanced variety • Weak Areas - Focus on challenging sentences • My Content - Create your own custom content to practice Build real Spanish fluency, one sentence at a time.

Screenshots

FluentU4 screens
Sentence Lab4 screens

Verdict

The call

The clearest difference is rating: FluentU at 4.3 against Sentence Lab's 3.0. FluentU also leads on ratings volume (2.8K vs 1) and update cadence (every 10 days vs every 6 weeks). 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. FluentU sells 8 in-app purchases, starting at $17.99 per month and Sentence Lab sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

FluentU holds the better App Store score, 4.3 against 3.0. That said, the two scores are not equally well evidenced: FluentU has 2.8K ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

FluentU ships an update every 10 days, Sentence Lab every 6 weeks. The most recent releases landed on November 11, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 7 level
FluentU versus Sentence Lab: the parameters behind the verdict, then further details
ParameterFluentUSentence Lab
PriceFreeFree
Rating4.3 (2.8K ratings) — better3.0 (1 ratings)
Positive reviews56.3% of reviews—
Number of ratings2.8K — better1
Update frequencyEvery 10 days — betterEvery 6 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.415.1 — better
Further details — not scored
Size545 MB43 MB
Age rating12+4+
DeveloperEnux Education LimitedJEFFREY ROBERT SANCHEZ

Bugs and requests

FluentU

Reported bugs

4 issues
  • App crashes frequently
  • Subscription issues and unexpected charges
  • Syncing and login problems
  • Inconsistent performance across devices

Requested features

4 requests
  • Add more language options
  • Improve user interface and navigation
  • Provide better guidance and progression for learners
  • Enhance audio and speech recognition capabilities

Sentence Lab

Not enough reviews yet to summarise bugs or requests.

In-app purchases

8 purchases

FluentU

Subscriptions8
  • FluentU Plus14 Days trial$17.991 Month
  • FluentU Plus14 Days trial2 variants$29.991 Month
  • FluentU Super Monthly14 Days trial$39.991 Month
Show 5 more
  • FluentU Plus14 Days trial$95.991 Year
  • FluentU Plus14 Days trial$119.991 Year
  • FluentU Plus14 Days trial$139.991 Year
  • FluentU Super Annual14 Days trial$199.991 Year
  • FluentU Plus14 Days trial2 variants$239.991 Year
2 purchases

Sentence Lab

Subscriptions2
  • Sentence Lab Monthly Subscription$5.991 Month
  • Sentence Lab Yearly Subscription$49.991 Year

Questions

Is FluentU free?
FluentU is free to download, with in-app purchases available.
Is Sentence Lab free?
Sentence Lab is free to download, with in-app purchases available.
Which has better reviews, FluentU or Sentence Lab?
FluentU is rated higher. FluentU averages 4.3 out of 5 from 2.8K ratings, while Sentence Lab averages 3.0 from 1 ratings.
Do FluentU or Sentence Lab have ads?
Neither FluentU nor Sentence Lab shows ads.
Which is updated more often, FluentU or Sentence Lab?
FluentU ships an update every 10 days, and Sentence Lab every 6 weeks. Most recently, FluentU was updated on November 11, 2026 and Sentence Lab on October 31, 2026.

Other comparisons