Ozzz

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Duolingo alternative for English learners: bite-sized lessons or open-ended immersion with Ozzz?

Duolingo is the cheaper structured lesson app. Ozzz is the on-demand virtual immersion surface for open-ended English practice across the day.

Duolingo alternative for English learners

Short Answer

If you want structured, bite-sized English lessons, Duolingo is the better fit and is usually cheaper. If you want open-ended English immersion that can keep returning across the day, Ozzz fits better: it combines persistent conversation, native/practice language settings, tap-to-reveal meaning, pronunciation on both speakers, daily return loops, and tool use. Ozzz usage is plain: $1 free each day, $10 top-ups, $0.01 minimum turn, about 15 normal minutes per $1, or about $40/day and $280/week for 10 hours/day before usage variation.

Key Points

  • Duolingo is cheaper for structured lesson habits.
  • Ozzz is better for open-ended English immersion across the day.
  • Ozzz is usage-priced: $1 daily credit, $0.01 minimum turn.
  • 10 hours/day is about $40/day or $280/week before usage variation.
  • Human tutors stay valuable for feedback and accountability; Ozzz complements them.

Where Ozzz Fits

Duolingo is the cheaper structured lesson app; Ozzz is the usage-priced open-ended virtual immersion surface for English practice across the day.

Ozzz Details

  • Usage Priced Immersion Credit$1 free daily credit, $10 top-ups, $0.01 minimum turn, about 15 minutes per $1, about $40/day or $280/week for 10 hours/day before usage variation.
  • Full Day Virtual Immersion SurfacePersistent open-ended conversation with native/practice language settings, tap-to-reveal meaning, pronunciation on both speakers, daily return loops, and tools in one surface.
  • All Day Immersion WindowOn-demand practice can recur across the waking day instead of being tied to a lesson card or booked slot.
  • Not A Lesson Game ReplacementDuolingo remains useful for structured habits and bite-sized drills.
  • Native And Practice Language SettingsThe app distinguishes native language from practice language so replies and speech follow learner context.

Short answer

Duolingo is the better fit if you want cheaper, structured, bite-sized English lessons. Ozzz fits when you want open-ended English immersion that can keep returning across the day.

  • Duolingo = lesson app
  • Ozzz = immersion app
  • Different product shapes

What Duolingo provides

Duolingo provides gamified lesson loops, streaks, points, and paid Super access. That makes it useful for cheap habit building, but it is still a lesson product.

  • gamified lessons
  • streaks and points
  • paid Super access

What Ozzz provides

Ozzz provides persistent conversation, native/practice language settings, tap-to-reveal meaning, pronunciation on both speakers, and app-native tools inside the same surface.

  • persistent conversation
  • tap-to-reveal meaning
  • tools inside the surface

Price and use math

Ozzz starts with $1 free each day. Paid top-ups start at $10. Each turn is usage-billed with a $0.01 minimum. About 15 normal minutes cost $1, so 10 hours/day is about $40/day or $280/week before usage variation.

  • $1/day free
  • $0.01 minimum turn
  • $40/day; $280/week

Tutor and immersion context

Preply remains better when you want scheduled human tutor feedback and accountability. For sustained 70-hour weekly immersion math, a $19/hour planning floor implies $1,330/week. Ozzz can complement tutor feedback with on-demand practice volume.

  • Preply for human feedback
  • $19/hour x 70 = $1,330/week
  • Ozzz complements, not replaces

International Versions

Chinese

用 Ozzz 学英语：比 Duolingo 更深入，比 Preply 更便宜的虚拟沉浸

Duolingo 更适合便宜、结构化、碎片化练习。Ozzz 适合需要全天可反复回来的英语沉浸：持续对话、母语/练习语言设置、点按查看意思、双向发音和工具使用。

  • Duolingo 是课卡式练习；Ozzz 是虚拟沉浸。
  • $1 每日赠额，$0.01 最低 turn。
  • 10 小时/天约 $40/天，$280/周。

Duolingo 何时更合适

Duolingo 更适合便宜的英语习惯养成、小游戏式练习和短时学习。它买到的是课程循环，不是 Ozzz 式开放对话沉浸。

  • 便宜
  • 结构化
  • 适合碎片时间

Ozzz 何时更合适

Ozzz 把语音当作界面和控制层，不只是输入输出。对话里有点按查看意思、双向发音、日常回访循环和工具工作流。

  • 持续对话
  • 双向发音
  • 工具内置

价格怎么算

Ozzz 先给每天 $1 免费额；充值从 $10 起。正常用量约 $1=15 分钟，10 小时/天约 $40/天，约 $280/周，长回复、查询、回放、图片和地理工作会消耗更多余额。

  • $1 免费/天
  • $0.01 最低 turn
  • $19/小时 × 70 = $1,330/周
Duolingo 还值得用吗？

值得。它更便宜，适合结构化、碎片化英语练习。

Ozzz 和家教一样吗？

不一样。Ozzz 不能替代人类反馈，但能补足全天沉浸量。

Spanish

Aprender ingles con Ozzz: mas inmersivo que Duolingo y mas barato que Preply

Duolingo sigue siendo mejor para hábitos baratos y lecciones cortas. Ozzz encaja cuando quieres inmersión abierta en inglés durante el día: conversación persistente, capas de significado, pronunciación y herramientas.

  • Duolingo = lecciones breves.
  • Ozzz = inmersión virtual continua.
  • $1 diario, $0.01 mínimo por turno.

Cuándo gana Duolingo

Duolingo es útil y más barato para práctica estructurada, repetición ligera y hábitos cortos. Su forma de producto es de lecciones gamificadas, no de inmersión abierta.

  • más barato
  • hábito guiado
  • lección corta

Qué hace Ozzz distinto

Ozzz combina conversación persistente, idioma nativo/práctica, tap-to-reveal, pronunciación en ambos lados y uso de herramientas dentro del chat.

  • conversación persistente
  • pronunciación en ambos lados
  • herramientas en el chat

Math de costo

Ozzz da $1 gratis al día, top-ups desde $10 y un mínimo de $0.01 por turno. Aproximadamente 15 minutos normales por $1; 10 horas al día son unos $40/día o $280/semana antes de variación.

  • $1/día
  • $40/día
  • $1,330/semana a $19/h × 70
¿Duolingo sigue sirviendo?

Sí. Es útil para lecciones cortas y hábitos baratos.

¿Ozzz reemplaza a un tutor?

No. Complementa la retroalimentación humana con práctica on-demand.

Hindi

Ozzz से अंग्रेज़ी सीखें: Duolingo से ज़्यादा गहरा, Preply से किफ़ायती

Duolingo सस्ती, संरचित छोटी-छोटी lessons के लिए बेहतर है। Ozzz तब फिट बैठता है जब आपको दिन भर लौटने वाली खुली, वास्तविक English immersion चाहिए।

  • Duolingo = lesson loops.
  • Ozzz = persistent immersion.
  • $1 daily credit, $0.01 minimum turn.

Duolingo कब बेहतर है

Duolingo उपयोगी है और आम तौर पर सस्ता है जब लक्ष्य structured habits और bite-sized drills हों। यह course-style lesson app है, Ozzz-style open conversation नहीं।

  • सस्ता
  • structured
  • bite-sized

Ozzz क्या अलग करता है

Ozzz में native/practice language settings, tap-to-reveal meaning, दोनों speakers पर pronunciation, daily return loops, और same conversation surface में tools हैं।

  • open-ended chat
  • tap-to-reveal
  • tools + pronunciation

खर्च का हिसाब

Ozzz पर visitor को हर दिन $1 free मिलता है। Paid top-up $10 से शुरू होता है, turn का minimum $0.01 है, और लगभग 15 normal minutes per $1 मिलते हैं; 10 hours/day लगभग $40/day या $280/week हैं।

  • $1/day
  • $40/day
  • $19/hour × 70 = $1,330/week
क्या Duolingo छोड़ना चाहिए?

जरूरी नहीं। वह cheap habit practice के लिए अच्छा है।

क्या Ozzz tutor की जगह लेता है?

नहीं। यह tutor feedback के साथ daily practice volume बढ़ाता है।

Arabic

تعلّم الإنجليزية مع Ozzz: انغماس أعمق من Duolingo وأرخص من Preply

Duolingo مناسب أكثر للعادات السريعة والدرس القصير. Ozzz يناسبك عندما تريد انغماسًا إنجليزيًا مفتوحًا يعود معك طوال اليوم: محادثة دائمة، إظهار المعنى، نطق، وأدوات داخل السطح نفسه.

  • Duolingo = دروس قصيرة.
  • Ozzz = انغماس مستمر.
  • $1 يوميًا، والحد الأدنى $0.01.

متى يكون Duolingo أفضل

Duolingo مفيد وأرخص عادةً عندما تريد عادة منظمة وتمارين قصيرة. هو تطبيق دروس، لا سطح انغماس مفتوح مثل Ozzz.

  • أرخص
  • منظم
  • قصير

ما الذي يميز Ozzz

Ozzz يدمج اللغة الأم/لغة الممارسة، tap-to-reveal، النطق على الطرفين، loops يومية، واستخدام الأدوات داخل نفس المحادثة.

  • محادثة دائمة
  • نطق على الطرفين
  • أدوات داخل المحادثة

حساب التكلفة

يبدأ Ozzz بـ $1 مجاني يوميًا، وتبدأ الشحنات من $10، والحد الأدنى للturn هو $0.01. حوالي 15 دقيقة عادية لكل $1؛ و10 ساعات يوميًا تقارب $40/يوم أو $280/أسبوع قبل تغيّر الاستخدام.

  • $1/يوم
  • $40/يوم
  • $19/ساعة × 70 = $1,330/أسبوع
هل Duolingo ما زال مفيدًا؟

نعم، خصوصًا للدروس القصيرة والعادات الأرخص.

هل Ozzz بديل كامل للمدرّس؟

لا، لكنه يكمل ملاحظات المدرّس بكمية ممارسة يومية كبيرة.

Portuguese

Aprender ingles com Ozzz: mais imersivo que Duolingo e mais barato que Preply

Duolingo é melhor para hábitos curtos e leções baratas. Ozzz serve quando você quer imersão aberta em inglês que volta ao longo do dia, com voz, revelar significado, pronúncia e ferramentas.

  • Duolingo = lições curtas.
  • Ozzz = imersão virtual contínua.
  • $1 por dia, mínimo $0.01.

Quando Duolingo é melhor

Duolingo é útil e geralmente mais barato para prática estruturada, hábitos e exercícios curtos. A forma do produto é de curso gamificado, não de conversação aberta.

  • mais barato
  • estruturado
  • curto

O que Ozzz faz

Ozzz junta conversa persistente, idioma nativo/prática, tap-to-reveal, pronúncia nos dois lados e ferramentas dentro da mesma conversa.

  • conversa persistente
  • pronúncia dupla
  • ferramentas no chat

Conta de custo

Ozzz começa com $1 grátis por dia, top-ups a partir de $10 e mínimo de $0.01 por turno. Em uso normal, cerca de 15 minutos por $1; 10 horas/dia dão cerca de $40/dia ou $280/semana.

  • $1/dia
  • $40/dia
  • $19/h × 70 = $1,330/semana
Duolingo ainda vale a pena?

Sim. É útil e mais barato para hábitos curtos e estruturados.

Ozzz substitui professor humano?

Não. Ele complementa feedback humano com prática sob demanda.

Indonesian

Belajar Bahasa Inggris dengan Ozzz: lebih mendalam dari Duolingo, lebih murah dari Preply

Duolingo lebih cocok untuk kebiasaan belajar yang murah dan terstruktur. Ozzz cocok saat Anda butuh imersi bahasa Inggris yang bisa muncul berulang sepanjang hari.

  • Duolingo = lesson loops.
  • Ozzz = immersion surface.
  • $1 gratis per hari, $0.01 minimum.

Kapan Duolingo lebih pas

Duolingo berguna dan biasanya lebih murah untuk latihan pendek, terstruktur, dan gamified. Itu app lesson loop, bukan ruang percakapan terbuka seperti Ozzz.

  • lebih murah
  • terstruktur
  • latihan singkat

Apa yang berbeda di Ozzz

Ozzz memakai voice sebagai interface, bukan hanya input. Ada native/practice language, tap-to-reveal meaning, pronunciation di kedua speaker, dan tools di dalam chat.

  • voice sebagai interface
  • tap-to-reveal
  • tools di chat

Hitung biaya

Ozzz memberi $1 gratis per hari, top-up mulai $10, dan minimum $0.01 per turn. Sekitar 15 menit normal per $1; 10 jam/hari kira-kira $40/hari atau $280/minggu.

  • $1/hari
  • $40/hari
  • $19/jam × 70 = $1,330/minggu
Apakah Duolingo masih bagus?

Ya, untuk kebiasaan belajar pendek dan murah.

Apakah Ozzz menggantikan tutor?

Tidak. Ozzz menambah volume praktik di antara sesi tutor.

Bengali

Ozzz দিয়ে ইংরেজি শেখা: Duolingo-এর চেয়ে গভীর, Preply-এর চেয়ে সাশ্রয়ী

Duolingo ছোট, কাঠামোবদ্ধ, কম খরচের lesson habit-এর জন্য ভালো। Ozzz দরকার যখন দিন জুড়ে বারবার ফিরে আসা open-ended English immersion চান।

  • Duolingo = lesson loops.
  • Ozzz = persistent immersion.
  • $1 daily credit, $0.01 minimum turn.

Duolingo কখন ভালো

Duolingo useful এবং সাধারণত সস্তা structured habit, streak, আর bite-sized drills-এর জন্য। এটি lesson app; Ozzz-এর মতো open conversation surface নয়।

  • সস্তা
  • structured
  • bite-sized

Ozzz কী আলাদা করে

Ozzz-এ native/practice language settings, tap-to-reveal meaning, দুই speaker-এর pronunciation, daily return loops, এবং একই conversation surface-এ tools আছে।

  • open-ended chat
  • pronunciation on both speakers
  • tools inside chat

খরচের হিসাব

Ozzz-এ প্রতিদিন $1 free credit, top-up $10 থেকে, আর $0.01 minimum turn। Normal use-এ প্রায় $1 = 15 মিনিট; 10 ঘণ্টা/দিন প্রায় $40/day বা $280/week।

  • $1/day
  • $40/day
  • $19/hour × 70 = $1,330/week
Duolingo কি এখনও দরকারি?

হ্যাঁ, structured ছোট practice-এর জন্য।

Ozzz কি tutor-এর বিকল্প?

না। এটি tutor feedback-এর সাথে daily practice volume যোগ করে।

Russian

Учить английский с Ozzz: глубже Duolingo и дешевле Preply

Duolingo лучше для дешёвых, коротких и структурированных привычек. Ozzz нужен, когда вам нужна открытая английская immersion-среда, которая возвращается в течение дня.

  • Duolingo = короткие уроки.
  • Ozzz = постоянная immersion.
  • $1 в день, минимум $0.01.

Когда лучше Duolingo

Duolingo полезен и обычно дешевле для структурированной практики и bite-sized drills. Это lesson-loop продукт, а не open-ended conversation surface.

  • дешевле
  • структурно
  • коротко

Чем Ozzz отличается

Ozzz использует voice как интерфейс, а не только как ввод. Есть native/practice language settings, tap-to-reveal meaning, pronunciation на обеих сторонах и tools inside chat.

  • persistent chat
  • pronunciation
  • tools inside chat

Цена

Ozzz даёт $1 free каждый день, top-up начинается с $10, minimum turn — $0.01. Около 15 минут обычного использования на $1; 10 часов в день — около $40/day или $280/week.

  • $1/day
  • $40/day
  • $19/hour × 70 = $1,330/week
Duolingo всё ещё полезен?

Да, для дешёвых коротких уроков и привычки.

Ozzz заменяет репетитора?

Нет. Он дополняет репетитора ежедневной практикой.

Japanese

Ozzzで英語を学ぶ：Duolingoより深く、Preplyより安い仮想イマージョン

Duolingoは安くて短いレッスン習慣に向いています。Ozzzは、1日中何度でも戻れる英語イマージョンが必要なときに向いています。

  • Duolingo = レッスンループ。
  • Ozzz = 継続会話。
  • $1/日、$0.01最小turn。

Duolingoが向く場面

Duolingoは structured な短時間練習に便利で、一般に Ozzz より安いです。商品形は lesson app で、Ozzz のような open-ended immersion ではありません。

  • 安い
  • 構造化
  • 短時間

Ozzzの違い

Ozzz は voice を入力だけでなく interface として使います。native/practice language、tap-to-reveal、両側の発音、daily return loops、同じ画面での tools を備えます。

  • 継続会話
  • 両側の発音
  • ツール内蔵

料金の考え方

Ozzz は毎日 $1 無料、top-up は $10 から、最小 turn は $0.01 です。通常利用は $1 で約15分、10時間/日は約$40/日、約$280/週です。

  • $1/日
  • $40/日
  • $19/時 × 70 = $1,330/週
Duolingo はまだ使うべき？

はい。短い練習習慣には向いています。

Ozzz は家庭教師の代わり？

いいえ。家庭教師のフィードバックを補完します。

Korean

Ozzz로 영어 배우기: Duolingo보다 깊고 Preply보다 저렴한 가상 몰입

Duolingo는 짧고 구조적인 습관에 좋습니다. Ozzz는 하루 종일 다시 돌아올 수 있는 열린 영어 몰입이 필요할 때 맞습니다.

  • Duolingo = lesson loops.
  • Ozzz = persistent immersion.
  • $1 daily credit, $0.01 minimum turn.

Duolingo가 더 맞는 경우

Duolingo는 구조화된 짧은 연습과 습관 형성에 유용하고 대체로 더 저렴합니다. 하지만 Ozzz 같은 open-ended immersion surface 는 아닙니다.

  • 더 저렴
  • 구조적
  • 짧은 연습

Ozzz가 다른 점

Ozzz는 voice를 입력만이 아니라 interface로 씁니다. native/practice language, tap-to-reveal meaning, 양쪽 발음, daily return loops, tools inside chat가 있습니다.

  • 지속 대화
  • 양쪽 발음
  • 툴 내장

비용 계산

Ozzz는 매일 $1 무료, top-up은 $10부터, 최소 turn은 $0.01입니다. 정상 사용은 $1당 약 15분, 10시간/일이면 약 $40/일 또는 $280/주입니다.

  • $1/일
  • $40/일
  • $19/시간 × 70 = $1,330/주
Duolingo도 계속 쓸 만한가요?

네. 저렴한 습관형 연습에 좋습니다.

Ozzz가 튜터를 대체하나요?

아니요. 튜터 피드백을 보완합니다.

Vietnamese

Học tiếng Anh với Ozzz: sâu hơn Duolingo, rẻ hơn Preply

Duolingo hợp với thói quen học ngắn, có cấu trúc và rẻ. Ozzz hợp khi bạn cần immersion tiếng Anh mở, quay lại được suốt cả ngày.

  • Duolingo = lesson loops.
  • Ozzz = immersion mở.
  • $1 mỗi ngày, tối thiểu $0.01.

Khi Duolingo hợp hơn

Duolingo hữu ích và thường rẻ hơn cho luyện tập ngắn, có cấu trúc. Nó là app bài học, không phải open-ended conversation surface như Ozzz.

  • rẻ hơn
  • có cấu trúc
  • ngắn

Ozzz khác gì

Ozzz dùng voice như interface, không chỉ là mic input. Có native/practice language, tap-to-reveal, phát âm ở cả hai phía, daily return loops và tools ngay trong chat.

  • conversation liên tục
  • phát âm hai phía
  • tools trong chat

Tính giá

Ozzz cho $1 miễn phí mỗi ngày, top-up từ $10, turn tối thiểu $0.01. Trung bình khoảng 15 phút cho $1; 10 giờ/ngày khoảng $40/ngày hoặc $280/tuần.

  • $1/ngày
  • $40/ngày
  • $19/giờ × 70 = $1,330/tuần
Duolingo còn đáng dùng không?

Có, nếu bạn muốn thói quen học ngắn và rẻ.

Ozzz có thay gia sư không?

Không. Nó bổ sung thêm lượng luyện tập hằng ngày.

French

Apprendre l'anglais avec Ozzz : plus immersif que Duolingo, moins cher que Preply

Duolingo reste mieux pour des habitudes courtes et des leçons bon marché. Ozzz convient quand vous voulez une immersion ouverte en anglais qui revient toute la journée.

  • Duolingo = leçons courtes.
  • Ozzz = immersion continue.
  • $1/jour, minimum $0.01.

Quand Duolingo est meilleur

Duolingo est utile et souvent moins cher pour des exercices structurés et rapides. C’est une app de leçons, pas une surface d’immersion ouverte comme Ozzz.

  • moins cher
  • structuré
  • rapide

Ce que fait Ozzz

Ozzz traite la voix comme une interface. Il garde le contexte natif/practice, le tap-to-reveal, la prononciation des deux côtés, les daily return loops et les tools dans la même conversation.

  • conversation persistante
  • prononciation des deux côtés
  • tools intégrés

Prix

Ozzz offre $1 gratuit par jour, les top-ups commencent à $10 et le minimum par turn est $0.01. En usage normal, environ 15 minutes par $1; 10 h/jour font environ $40/jour ou $280/semaine.

  • $1/jour
  • $40/jour
  • $19/h × 70 = $1,330/semaine
Duolingo reste utile ?

Oui, pour des habitudes courtes et moins chères.

Ozzz remplace un tuteur ?

Non. Il complète les retours humains avec plus de pratique.

German

Englisch lernen mit Ozzz: tiefer als Duolingo, günstiger als Preply

Duolingo ist besser für billige, kurze und strukturierte Lerngewohnheiten. Ozzz passt, wenn Sie offene Englisch-Immersion brauchen, die über den Tag immer wieder zurückkommt.

  • Duolingo = Lesson-Loops.
  • Ozzz = dauerhafte Immersion.
  • $1 pro Tag, $0.01 Minimum.

Wann Duolingo besser ist

Duolingo ist nützlich und meist günstiger für strukturierte Kurzpraxis. Es ist eine Lesson-App, keine offene Conversation-Surface wie Ozzz.

  • günstiger
  • strukturiert
  • kurz

Was Ozzz anders macht

Ozzz nutzt Voice als Interface. Es gibt native/practice language settings, tap-to-reveal meaning, Aussprache auf beiden Seiten, daily return loops und Tools im selben Chat.

  • persistente Konversation
  • Aussprache beidseitig
  • Tools im Chat

Kosten

Ozzz startet mit $1 gratis pro Tag, Top-ups ab $10 und $0.01 Minimum pro Turn. Normale Nutzung: etwa 15 Minuten pro $1; 10 Stunden/Tag sind etwa $40/Tag oder $280/Woche.

  • $1/Tag
  • $40/Tag
  • $19/Stunde × 70 = $1,330/Woche
Ist Duolingo noch sinnvoll?

Ja, für kurze strukturierte Gewohnheiten.

Ersetzt Ozzz einen Tutor?

Nein. Es ergänzt menschliches Feedback mit mehr Praxis.

Turkish

Ozzz ile İngilizce öğrenin: Duolingo'dan daha derin, Preply'den daha ucuz

Duolingo, ucuz ve yapılandırılmış kısa alışkanlıklar için daha uygundur. Ozzz, gün boyunca tekrar tekrar dönebileceğiniz açık uçlu İngilizce immersion gerektiğinde daha uygundur.

  • Duolingo = ders döngüsü.
  • Ozzz = sürekli immersion.
  • $1/gün, $0.01 minimum turn.

Duolingo ne zaman daha iyi

Duolingo kullanışlıdır ve çoğu zaman yapılandırılmış, kısa ve oyunlaştırılmış pratik için daha ucuzdur. Bu bir lesson app’tir; Ozzz gibi open-ended immersion surface değildir.

  • daha ucuz
  • yapılandırılmış
  • kısa

Ozzz neyi farklı yapar

Ozzz voice’u sadece giriş değil interface olarak kullanır. Native/practice language, tap-to-reveal, iki tarafta pronunciation, daily return loops ve aynı sohbette tools vardır.

  • sürekli sohbet
  • iki tarafta pronunciation
  • tools içeride

Maliyet

Ozzz her gün $1 ücretsiz verir, top-up $10’dan başlar ve minimum turn $0.01’dir. Normal kullanımda $1 yaklaşık 15 dakika; 10 saat/gün yaklaşık $40/gün veya $280/haftadır.

  • $1/gün
  • $40/gün
  • $19/saat × 70 = $1,330/hafta
Duolingo hâlâ iyi mi?

Evet, kısa ve ucuz alışkanlıklar için.

Ozzz öğretmenin yerini alır mı?

Hayır. Öğretmen geri bildirimini tamamlar.

FAQ

Is Duolingo useless?

No. It is useful for cheap, structured practice.

Is Ozzz a tutor replacement?

No. It is on-demand immersion that complements tutor feedback.

Sources

  1. Duolingo official homepageDuolingo
  2. Duolingo App Store listingApple App Store
  3. Super DuolingoDuolingo
  4. Duolingo no-JS language learning pageDuolingo
  5. Principles and Practice in Second Language AcquisitionStephen D. Krashen
  6. GPT-4 research releaseOpenAI
  7. GPT-4o System CardOpenAI