Mersio
中文

Immersive language learning through what interests you.

Mersio turns the videos you care about into immersive study material—so you can listen closely, read deeply, understand in context, and keep what you learn.

See how it works
How to get one

A tool built for immersive language learning

  • Your own content
  • Intensive listening & reading
  • Meaningful segments
  • Contextual AI help
  • Editable transcript

Attention is all learning needs

Stay with the language, not the tools.

No more switching to a separate dictionary or AI tool while you learn. Mersio integrates everything you need into the app, so you can stay focused on learning.

Your interests, not a content catalog

Start with a video you are genuinely interested in.

A TV episode, a film clip, a talk, or a favorite interview can become learning material. Import a local video or add online videos—Mersio does not choose the lesson for you.

  • Local video
  • YouTube
  • Bilibili

Local Whisper transcription

Your audio becomes a transcript on your Mac.

Mersio runs Whisper locally, then organizes speech into meaningful segments: small enough to replay, but long enough to keep a complete idea intact.

Audio stays on this Mac while Whisper transcribes it.

Listen your way

Stay with one segment until it clicks.

Replay the active segment or slow it down. Playback and transcript stay together, so repetition never turns into timeline hunting.

  • Segment loop
  • 0.75× Variable speed

Blind listening & dictation

You only truly understand when you can hear it.

Hide the transcript, replay meaningful segments, and write down what you hear. Reveal the original when you are ready, then compare on your own—no scores and no forced steps.

  • Hide the transcript
  • Save dictation locally
  • Reveal and compare anytime

Understanding on demand

Click what you don't understand.

Select a word, phrase, or passage for an AI explanation that includes the surrounding transcript. When you need to, right-click to translate the whole segment.

Explain and translation send the relevant transcript text—not your media—to Mersio's cloud AI.

A transcript you control

Freely edit every auto-generated subtitle and segment boundary.

Edit the words directly. Split or merge segments when an idea was grouped poorly, and drag timing boundaries against the waveform when the audio starts or ends in the wrong place.

FAQ

Questions, answered.

Still have questions? Browse the answers below.

Which platforms can run Mersio?

Mersio runs on Mac computers with Apple silicon or an Intel processor. Each architecture ships its own build; Windows and Linux are not supported.

Why do I need an invite code to download?

Mersio is in private preview. The invite code only unlocks the download here; you activate the app itself with the same code on first launch. Don’t have one? Email us — tell us a bit about yourself and we will reply with an invite code.

Does transcription happen in the cloud?

No. Mersio downloads Whisper during setup and transcribes audio on your Mac. AI Explain and translation are separate, on-demand cloud features that send relevant transcript text—not your media—to Mersio’s backend.

What can AI help me understand?

Select a word, phrase, or passage to get an explanation based on its surrounding transcript context. You can also translate individual segments or the full transcript into Simplified Chinese.

Does Mersio grade my dictation?

No. Mersio hides the transcript and saves what you type. You choose when to reveal the original transcript and compare it yourself; Mersio does not score your answer or calculate accuracy.

Where do my media, transcripts, notes, and dictation live?

Mersio keeps imported media in its managed media library on your Mac. Transcripts, segment timing, notes, and blind-listening dictation are stored in a local database.

Which sources can I import?

Local video files, YouTube links, and Bilibili links.

What if the transcript is wrong?

Every segment remains under your control. Edit its words, split or merge it with another segment, or adjust its start and end timing against the waveform.

Learn deeply from what already interests you.

Bring the next video you want to understand. Mersio gives you one quiet workspace to listen, explore, and make it yours.