Comparison

Lumen vs Sentence Forge

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

Head to head
About

Lumen

Engage in real-time spoken conversations with an AI tutor to improve language fluency. The app focuses on speaking practice, providing instant feedback and personalized lessons based on your learning goals and level. It offers a unique approach to mastering new languages through interactive dialogue.

Highlights
  • Real-time spoken conversations
  • AI tutor listens and corrects
  • Personalized course based on goals
  • Adaptive level testing
  • Learn 7 languages
  • Vocabulary building
  • Conversation transcripts
Features
Read full description

Most language apps have you tapping. Lumen has you talking. Press start and you're in a real conversation with a tutor who listens, answers, and corrects you as you go — out loud, in real time, from your first lesson. WHY IT WORKS You can finish a thousand exercises and still freeze when someone asks you a question. The only cure is the thing most apps avoid: opening your mouth and being slightly wrong in front of someone. Lumen is built entirely around that moment — and it never runs out of patience. A LESSON • Tap start and talk. No typing, no scripts. • Your tutor speaks at your level, and switches to your language the moment you're lost. • Corrections arrive gently, mid-conversation, and are saved for you. • Every word you reach for and don't have is captured into your vocabulary. • You leave with one short piece of homework built from what actually happened. A COURSE, NOT A PILE OF LESSONS Tell Lumen why you're learning — work, family, travel, a move abroad — and it builds the course around that. Every class has a plan, a focus and a role-play. It gets harder as you do. YOUR REAL LEVEL Practise enough and the Level Test unlocks: a timed, adaptive, listen-and-speak assessment that can place you anywhere from A1 to C2. No typing, no multiple guess — what you can do on your own decides it. Then your tutor teaches to that. SEVEN LANGUAGES Learn English, Spanish, Portuguese, French, German, Italian or Japanese — with the app itself in all seven, so you're never learning in a language you don't speak yet. ALSO INSIDE • Full transcripts of every conversation, with your corrections highlighted • Spaced review of everything you've got wrong • 25 badges — one for each CEFR level, one for each practice milestone up to 1,000 minutes • A streak that forgives one missed day • Text practice for when you can't speak out loud Lumen is a subscription with a free trial, so you can have a real conversation before you decide. SUBSCRIPTION DETAILS • Lumen Premium — 6 months, $59.99 (works out at $9.99/month) • Lumen Premium — 1 month, $14.99 • 3 days free, then the plan you chose. Cancel any time in your Apple ID settings at least 24 hours before it renews. • Payment is charged to your Apple ID at confirmation of purchase. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://lumen-speak.com/privacy

About

Sentence Forge

Features
Read full description

Sentence Forge turns everyday sentences into a language workout. Pick your languages, get a sentence in your native language, and translate it - then our AI instantly scores your answer and shows you exactly how to improve. - AI feedback on every sentence: score, corrections, and a better version - Practice real, useful sentences - travel, work, and daily life - Build your personal vocabulary as you learn - Choose your CEFR level and sentence structures - Compete with friends and climb the leaderboard - Learn English, German, Spanish, French, Italian and more Whether you're a beginner or brushing up, Sentence Forge helps you actually produce the language - not just tap flashcards. Practice a little every day and watch your writing get sharper. Start free. Upgrade to Pro for unlimited AI practice and an ad-free experience. Terms of Use (EULA): https://sentenceforge.eayavuz.com/terms Privacy Policy: https://sentenceforge.eayavuz.com/privacy

Screenshots

Lumen4 screens
Sentence Forge4 screens

Verdict

The call

The clearest difference is ads: Lumen at none against Sentence Forge's shown. On price, update cadence, in-app purchases and device support 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. Lumen sells 2 in-app purchases, starting at $14.99 per month and Sentence Forge sells 1 in-app purchase, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Lumen ships an update every 10 days, Sentence Forge weekly. Both last shipped on October 24, 2026.

Scorecard1 real difference · 9 level
Lumen versus Sentence Forge: the parameters behind the verdict, then further details
ParameterLumenSentence Forge
PriceFreeFree
Rating5.0 (4 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings4 — better—
Update frequencyEvery 10 daysWeekly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.015.0
Further details — not scored
Size8 MB44 MB
Age rating4+4+
DeveloperDaniel AraujoEmre Abdullah Yavuz

In-app purchases

2 purchases

Lumen

Subscriptions2
  • Lumen Monthly3 Days trial$14.991 Month
  • Lumen 6 Months3 Days trial$59.996 Months
1 purchases

Sentence Forge

Subscriptions1
  • Pro Monthly$4.991 Month

Questions

Is Lumen free?
Lumen is free to download, with in-app purchases available.
Is Sentence Forge free?
Sentence Forge is free to download, with in-app purchases available.
Do Lumen or Sentence Forge have ads?
Sentence Forge shows ads; Lumen does not.
Which is updated more often, Lumen or Sentence Forge?
Lumen ships an update every 10 days, and Sentence Forge weekly. Most recently, Lumen was updated on October 24, 2026 and Sentence Forge on October 24, 2026.

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