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alass

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Automatic Language-Agnostic Subtitle Synchronization.

Cost / License

Free
Open Source (GPL-3.0)

Platforms

Windows
Linux
Rust

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Recent activities

Paul added alass as alternative to CinemaCC
19 days ago
Paul added alass as alternative to VivySub
5 months ago
Flora Wang added alass as alternative to GeekLink
5 months ago
niksavc liked alass
9 months ago
K0RR added alass
9 months ago
K0RR liked alass
9 months ago
K0RR added alass as alternative to ffsubsync, Subtitle Edit, Aegisub, SubTypo and 25 more
9 months ago

alass information

Developed by
kaegi
Licensing
Open Source (GPL-3.0) and Free product.
Written in
Rust
Alternatives
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Supported Languages
- English

GitHub repository

1,451 Stars
75 Forks
36 Open Issues
Updated Dec 28, 2023

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alass was added to AlternativeTo by K0RR on Jan 11, 2026 and this page was last updated Jan 11, 2026.

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What is alass?

Command line tool to synchronize subtitles to movies.

It can automatically correct:

constant offsets
splits due to advertisement breaks, directors cut, ...
different framerates

The alignment process is not only fast and accurate, but also language-agnostic. This means you can align subtitles to movies in different languages.

alass Videos