Understands 100 languages, from English and Tagalog to Spanish, Chinese and Arabic.
Subtitle and translation app
Salin
Free English subtitles for videos in any language, made on your Mac.
Overview
What Salin is and why it exists.
Salin turns talks, testimonies and sharing videos into English subtitles. Drop in a video in any of 100 languages, including Tagalog and mixed speech like Taglish, and Salin writes timed subtitles, translates them to English, and lets you fix any line next to the video, style it with animated looks, and export a new video with the subtitles burned in, sized for Reels, Instagram, Facebook or YouTube. Speech recognition and translation run entirely on your Mac, so your videos are never uploaded. It's completely free, with no account and no limits.
Highlights
Why people love Salin.
Translates any language to English, even mixed speech like Taglish.
Runs entirely on your Mac: your videos are never uploaded.
Edit text and timing next to the video, with live subtitle preview.
Split, merge and re-time lines from the playhead.
30 animated subtitle looks: karaoke, highlight, neon, typewriter and more.
Exports finished MP4s for Reels, Stories, TikTok, Instagram, Facebook and YouTube.
Glossary for names and terms you want kept or translated a fixed way.
Completely free: no account, no subscription, no limits.
The story
From problem to product.
The problem
Subtitling a talk by hand takes hours, and online tools upload your videos, charge per minute, and struggle with languages like Tagalog.
The approach
A free Mac app that does the listening and translating on your own computer, then gives you a simple editor to polish every line.
Under the hood
How it came together.
Scope
What the product covers, end to end.
- Speech recognition and subtitle timing.
- Translation from any language to English.
- Subtitle editor with video preview.
- Styled, animated subtitles burned into MP4 exports.
- Onboarding that downloads the speech models once.
Technology
How it is built and kept running.
- Flutter client for macOS.
- whisper.cpp with Metal acceleration for speech recognition and translation.
- Voice detection to skip music and silence.
- Bundled FFmpeg with libass and hardware H.264 encoding.
- Sparkle updates.
Role & delivery
What NashSaint designed, built and shipped.
- Product design and engineering.
- Speech pipeline: segmentation, timing and translation alignment.
Outcomes
The difference it makes.
- 01 English subtitles for an hour-long talk without typing them by hand.
- 02 Private by design: nothing leaves the Mac.
- 03 Runs on Apple Silicon Macs (M1 and later).
Need a hand?
Questions about Salin?
Send a support request and you will hear back by email. Privacy and terms are always one click away.