Best Free AI English Tutor for iOS · by CodeLovin Studios

Sky ENG

The AI English tutor that actually hears you. Real acoustic speech analysis — pronunciation, fluency, grammar, and exam prep for IELTS, TOEFL, PTE & CELPIP. 100% private. Free on iOS.

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Our Apps

AI tutor. Visual novel.
Both free.

Sky ENG is the AI English tutor built on real acoustic science. Interactive Stories: Sky ENG is the visual novel that unlocks everything from day one. Both by CodeLovin Studios. Both with zero paywalls.

Education · Free

Sky ENG
AI English Tutor

Real acoustic speech analysis — not word-matching, not a cloud AI guess. Sky ENG measures RMS energy, pause ratios, amplitude variance, and temporal stability on your device to give you exam-quality feedback on every session.

  • Real-time pronunciation & fluency scoring
  • IELTS, TOEFL, PTE, CELPIP exam prep
  • Roleplay scenarios & conversation practice
  • Reading, listening & vocabulary word games
  • On-device only — your data never leaves your phone
  • Free to download · iOS only
Download on the App Store Read the feature guide →
Visual Novel · Free

Interactive Stories:
Sky ENG

Four complete visual novel sagas. 250+ chapters unlocked from the moment you download. One short ad per chapter — that's the entire business model. No paywalls, no subscriptions, no diamonds, no energy timers. Story first. Game second.

  • Dracula: King of Darkness — gothic horror romance
  • Dracula: King of Darkness II — time-travel dark romance
  • The Third Flame — Bollywood ghost story
  • Dantes Descent — Mythological Romance story
  • Lucien Graves: The Sacrifice — Noir-Occult Romance story
  • 250+ chapters, all unlocked. Multiple endings per story.
  • Original music score composed for every game
  • Free to download · iOS · Android coming soon
Download on the App Store Explore the full story page →
Sky ENG: AI English Tutor

How the acoustic analysis works

Acoustic Speech Analysis

Measures RMS energy, peak amplitude variance, silence segmentation, and speaking-pause ratio — the same metrics used in official language testing.

Exam-Grade Scoring

90%+ across metrics typically correlates to IELTS Band 7.5–9.0, TOEFL 26–30, PTE 79–90, and CELPIP Level 10–12.

Roleplay & Conversation

Practice real-life scenarios, job interviews, academic discussions, and exam-style prompts with an AI tutor that responds to what you actually say.

Word Games

Vocabulary challenges, spelling games, reading and listening comprehension — all integrated with live AI feedback on your English.

Private by Design

All analysis happens on your device. No recordings are uploaded. No personal data is collected or stored in the cloud. Ever.

Free · iOS Only

Download Sky ENG for free on iOS. No subscription required. Set your voice to "Zoe (Premium) (en-US)" for the most natural experience.

App Screenshots

See Sky ENG in action

From real-time speech analysis to roleplay conversations, vocabulary lookup to exam-style reading and listening practice.

Sky ENG AI English Tutor — Main Menu top section showing practice modes
Main Menu
Sky ENG — Main Menu bottom section with additional features
Menu Features
Sky ENG — Expanded main menu showing full feature set
Expanded Menu
Sky ENG — Detailed speech analysis with pronunciation, fluency and clarity scores
Speech Analysis
Sky ENG — Real-time AI chat feedback on English speaking
Real-Time Feedback
Sky ENG — Reading passage practice for IELTS and TOEFL exam preparation
Reading Practice
Sky ENG — Listening comprehension exercise for English exam prep
Listening Practice
Sky ENG — AI roleplay conversation scenario for English fluency practice
Roleplay Chat
Sky ENG — Word definition lookup with AI explanation
Word Definition
Sky ENG — Word translation lookup feature for English learners
Translation Lookup

← Drag to explore →

Interactive Stories: Sky ENG

Four complete visual novels — all chapters unlocked from download

Gothic Horror Romance

Dracula: King of Darkness

Vlad Dracula before he became a monster — told simultaneously as a horror story and a love story. Two registers, one ending you earn.

5 Acts · 3 Endings · 2–4 Hours

Time-Travel Dark Romance

Dracula: King of Darkness II

From 2026 London to 1431 medieval Wallachia. A slow-burn romance built across sixteen years. A Connection Meter that rewards emotional attention.

38 Chapters · 6 Acts · 3 Endings · 5–8 Hours

Bollywood Ghost Story

The Third Flame

It begins as a warm love story set across 1973 Bombay and 2007 Mumbai. By the time you understand what kind of story you're inside, it has been with you for hours.

64 Chapters · 11 Acts · 3 Endings · 5–9 Hours

Mythological Dark Romance

Dante's Descent

A scholar descends through Hell's nine circles to find the woman he lost — guided by a companion who knows more than she says. A slow-burn love story built through darkness.

39 Chapters · 6 Acts · 3 Endings · 5–8 Hours

Noir-Occult Romance

Lucien Graves: The Sacrifice

A reluctant exorcist, a primordial demon, and a deep, slow-burn love story earned in the quiet, ordinary moments before the dark. You decide who walks away.

25+ Chapters · 4 Acts · 3 Endings · 3–5 Hours

Download Interactive Stories Free on iOS
The Developer

Built by CodeLovin Studios.

CodeLovin Studios is an iOS developer. Both apps — the Sky ENG AI English tutor and the Interactive Stories: Sky ENG visual novel anthology — are designed, built, and maintained by the same developer.

The tutor uses on-device acoustic science to deliver pronunciation feedback that's actually meaningful — not word-matching, not a cloud guess. The stories are written to literary standards, not engagement-loop standards. Both are completely free because they're built on a model that doesn't require you to pay.

Questions? Feedback? Reach us at codelovin@outlook.com — responses within 48 hours.

2
Free iOS apps — education & interactive fiction
250+
Visual novel chapters, all unlocked from download
0
Paywalls, locked chapters, or subscription fees — in either app
∞
Practice sessions in Sky ENG — free, private, on-device forever
Legal & Support

Privacy & Support

Sky ENG — AI English Tutor

All practice sessions, speech recordings, and transcripts remain entirely on your device. Sky ENG does not collect personal data, does not store recordings in the cloud, and does not share any information with third parties. Your voice stays yours.

App Store listing →

Interactive Stories: Sky ENG

No account or login is ever required. To keep all chapters free, one short ad is shown before each chapter is unlocked via Google AdMob. We implement Apple's App Tracking Transparency (ATT) framework — you can opt out at any time from iOS Settings without affecting gameplay. No personal identifiers are collected.

App Store listing →

Support

For support, questions, or feedback on either app, contact us at codelovin@outlook.com. We aim to respond within 48 hours. For bug reports, please include your iOS version and device model.

Blog & Feature Guides

Read the complete Sky ENG feature guide — covering acoustic analysis, exam scoring, roleplay scenarios, word games, and getting started tips — on the blog page.

Read the blog →