New in 1.1A simpler app, more accurate captions

Captions that keep up with you.

Subly listens to your video and writes the captions right on your Mac. Nothing is uploaded. Get Hindi, Hinglish and English from one listen, perfectly in sync.

Download for Mac

Free · Open source · macOS 26+

View on GitHub

Version 1.1 · about 3 MB · Apple Silicon · All releases

The Subly editor in dark mode. A colourful vertical video shows the bold caption “Yah iPhone ka display bahut achchha hai”, with Hindi and Hinglish caption tracks lined up on the timeline and caption looks in the side panel.
One listen

Three tracks. One timing.

Subly hears your video once and writes up to three caption tracks that start and stop at exactly the same moments.

Spoken scriptin its own letters
आप कैसे हो?यह iPhone का डिस्प्ले बहुत अच्छा हैकैमरा की क्वालिटी भी शानदार है
Hinglishsame words, English letters
Aap kaise ho?Yah iPhone ka display bahut achchha haiCamera ki quality bhi shaandaar hai
Translationwith Apple’s on-device translation
How are you?This iPhone’s display is really goodThe camera quality is great too

Pick one, two or all three. With the free Whisper model installed, Subly detects the spoken language for you.

Animated demo: the same purple, pink and orange reel shown twice side by side, once with Karaoke captions that light up word by word and once with Bold Pop captions.
Karaoke and Bold Pop, side by side
Caption looks

Pick a look. Make it pop.

Six looks made for Reels and Shorts. Then tune the font, size, colour, background and where the captions sit.

  • Clean
  • Bold Pop
  • Karaoke
  • Boxed
  • Minimal
  • Typewriter
How it works

Three easy steps.

From video to finished captions, without leaving your Mac.

  1. Subly home screen with a drop area for a video and a grid of three projects: Phone review, Sunset vlog and Tapas tour.

    Add Video

    Drop in an MP4, MOV or audio file. Your projects wait for you on the home screen.

  2. The Choose step. Hindi is detected as the spoken language, with Hinglish and Hindi caption cards selected and English translation available. A Names and brands field contains iPhone.

    Choose

    Check the spoken language — Subly detects it when the Whisper model is installed. Pick your caption tracks and add names and brands so they’re spelled right.

  3. The editor in light mode. A sunset vlog shows the caption “reflections. At high brightness it feels crease-free.” above a timeline of captions, with a Sync control in the side panel.

    Edit & Share

    Click a caption on the video to fix it, pick a look, then export your video or caption file.

Features

Small app. Big captions.

Private

Everything runs on your Mac. Your videos are never uploaded.

In sync

Every track shares the same timings. If captions feel early or late, Sync nudges them all by 0.05 s.

Edit on the video

Click a caption on the video to fix a word. Drag to move the captions. Undo anything.

Caption looks

Clean, Bold Pop, Karaoke, Boxed, Minimal and Typewriter, with your own font, size and colour.

Made for Hinglish

Hindi in Devanagari, the same words in English letters, or both. The optional Apex model is tuned for Hindi to Hinglish.

Share anywhere

Export a video with captions burned in for Reels, Shorts and Instagram, or save SRT, VTT, TXT or JSON.

Want more languages? Download the optional Whisper model (about 99 languages) inside the app. Models download only when you ask.

Open source

Free. Open. Yours to read.

Subly is open source under the MIT licence. Read the code, report issues, contribute.

Read the code Report an issue
$ git clone https://github.com/DhananjayBhosale/Subly.git
Install

Install in four steps.

  1. Download Subly.dmg, open it and drag Subly to Applications.
  2. Open Subly. macOS says it can’t check the app. Click Done.
  3. Open System Settings › Privacy & Security and scroll down.
  4. Click Open Anyway next to Subly. You only do this once.

Why the extra step?

Subly isn’t notarized by Apple yet, so macOS can’t check it the first time you open it. It’s a one-time step, and all of Subly’s code is public on GitHub for anyone to read.

  • Apple Silicon Mac
  • macOS 26 or later
  • About 3 MB
Download for Mac

All releases

FAQ

Questions, answered.

Is it free?

Yes. Subly is free and open source under the MIT licence. Download it, use it, share it.

Does it upload my videos?

No. Subly listens, writes and translates on your Mac, so your videos never leave it. The optional speech models download inside the app, and only when you ask.

Which languages does it support?

Subly uses Apple’s built-in speech recognition out of the box, and detects the spoken language automatically once the free Whisper model is installed. For more, download the optional Whisper model (about 99 languages) or Apex, which is tuned for Hindi to Hinglish. Translations use Apple’s on-device translation.

Why does macOS show a security warning?

Subly isn’t notarized by Apple yet, so macOS can’t check it the first time you open it. Click Done, then go to System Settings › Privacy & Security, scroll down and click Open Anyway. You only need to do this once.

What do I need?

A Mac with Apple Silicon running macOS 26 or later.