aeneas

What it does

Forced alignment: give it a recording and the matching text, and it computes where each fragment begins and ends — the machinery behind read-along ebooks, highlighted-as-you-listen learning material and subtitle timing. It aligns existing audio and text rather than generating either. The core dates from 2017 with the last touch in mid-2024, so installation can fight modern dependencies, but alternatives in this niche remain thin. AGPL-3.0.

Summary based on the project's own description. The Japanese page has a fuller beginner guide: setup difficulty, what to prepare, and a step-by-step start.

Screenshots & visuals

Before you start

• Setup difficultySome setup needed
• Command lineRequired
• API keyNot required
• Sends data onlineNo

Judged automatically from the project's own metadata. Always confirm on the official page.

aeneas FAQ

Is aeneas free?

Yes. It runs on your own machine, so there is no usage-based cost either.

Do I need to install anything or write code to use aeneas?

It needs the command line. If you are not comfortable typing commands, expect to get stuck during setup.

Does aeneas work on a phone?

No. It needs a computer.

Can I use aeneas commercially?

The licence is AGPL-3.0. Using it commercially is fine, but if you distribute something built on it you may be required to release that under the same licence. Keep it internal, or check before distributing.

How it compares

The conditions that decide whether you can actually use it, side by side.

"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.

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