InfiSpeak

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Everyone
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Content rating
Everyone
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About this app

InfiSpeak is a step-by-step language speaking app that takes you from listening and repetition to speaking feedback and real-world AI conversation.

Create your own TXT study files from the learning materials that matter to you. Listen, speak, repeat, and build practical language skills at your own pace.

■ Four-Step Training

• Training 1: Listen and Understand
Listen to sentences with native-language support and build comprehension.

• Training 2: Listen and Repeat
Hear each sentence, repeat it aloud, and develop pronunciation and speaking confidence.

• Training 3: Speak and Get Feedback
Look at a sentence in your native language, say it in your learning language, and receive scoring and feedback. Basic Mode works without an OpenAI API key. AI Evaluation Mode is available with an API key.

• Training 4: AI Role-Play Conversation
Practice real-world English conversations based on the selected Lesson and Focus. Training 4 is currently available for English conversation only and requires an OpenAI API key.

■ Key Features

• Multilingual learning support in Training 1–3
• Full Listening and Integrated Training
• Lesson-based sequential or random practice
• Repeat one sentence or an entire lesson
• Save and practice favorite sentences
• Track learning progress and study streaks
• Choose between default TTS and OpenAI voices
• Import your own TXT study files
• Export favorite sentences as a TXT file
• Generate natural expressions with “How Do I Say This?”

■ Create Your Own Learning Materials

Turn books, movies, YouTube videos, news articles, travel phrases, workplace expressions, and everyday conversations into personalized study files.

Write one sentence per line and separate the learning-language sentence from its native-language translation with the | character.

Learning language sentence|Native language translation

You can also organize your materials with Lesson and Focus headings.

■ OpenAI API Key

An OpenAI API key is optional.

Without an API key, you can use Training 1, Training 2, Training 3 Basic Mode, and standard repeat-learning features.

A personal OpenAI API key is required for Training 3 AI Evaluation Mode, Training 4 AI Conversation, OpenAI voices, and certain AI-powered features. OpenAI API usage may result in charges to your OpenAI account.

Start with one sentence a day. Small, consistent practice can grow into confident, natural speaking.
Four-step language practice with custom TXT files and AI English conversation.
Updated on
Sep 5, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • No data collected
    Learn more about how developers declare collection

What’s new

■ InfiSpeak 2.5.2 Update

• Updated the default English study file to v1.1 with chunk markers.
• Chunk speaking mode is now automatically disabled when the study file contains no chunks.
• Added a Retry button when speech is not recognized in Training 3.
• Corrected the lesson-order description on the initial setup screen.
• Improved overall usability and stability.