Lumen vs Sentence Forge
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Real-time spoken conversations
- AI tutor listens and corrects
- Personalized course based on goals
- Adaptive level testing
- Learn 7 languages
- Vocabulary building
- Conversation transcripts
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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
Sentence Forge
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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
Verdict
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
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.
Lumen ships an update every 10 days, Sentence Forge weekly. Both last shipped on October 24, 2026.
| Parameter | Lumen | Sentence Forge |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 10 days | Weekly — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 8 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | Daniel Araujo | Emre Abdullah Yavuz |
In-app purchases
Lumen
- Lumen Monthly3 Days trial$14.991 Month
- Lumen 6 Months3 Days trial$59.996 Months
Sentence Forge
- Pro Monthly$4.991 Month









