Release Notes

0.13.2 Public Preview

Fast Sub 0.13.2 is a desktop public preview focused on FFmpeg / FFprobe readiness. Windows x64 is the release-candidate platform; macOS arm64 is a preview build.

Changes since 0.13.1:

• Missing FFmpeg / FFprobe no longer blocks opening the desktop app.
• Transcription and burn-in now ask for FFmpeg / FFprobe only when a job actually needs them.
• Users can choose an existing FFmpeg / FFprobe directory, explicitly download app-private FFmpeg, or use a same-directory system PATH pair.
• Windows packages include bundled aria2 for FFmpeg downloads, with normal HTTPS fallback.
• macOS packages use the built-in HTTPS downloader by default instead of bundled aria2.
• Diagnostics and provider refresh should not repeatedly retry FFmpeg installation.

Validated areas:

• Windows x64 installer build.
• Windows x64 portable zip build.
• Packaged runtime smoke.
• Native dependency smoke for missing, custom, app-private, and system PATH FFmpeg sources.

0.13.1 Public Preview

Fast Sub 0.13.1 is a Windows x64 desktop release candidate focused on restoring packaged no-key web translation and tightening public project documentation.

Changes since 0.13.0:

• Restored no-key Bing/Google web translation in the packaged desktop app through an ASAR-outside JS helper.
• Kept the old Python translators/js2py dependency chain removed from the Python lock file and packaged Python runtime.
• Added generated API/reference documentation under dev-docs/api/.
• Added and reorganized public repository docs, contribution guidance, security policy, roadmap, issue templates, and AI-assisted workflow notes.
• Documented the CI-equivalent local validation workflow for future release branches.

Validated areas:

• Windows x64 installer smoke.
• Windows x64 portable zip smoke.
• No-key Bing/Google web translation for short subtitles in the packaged desktop app.
• Python, Go, and Desktop CI checks.

0.13.0 Public Preview

Fast Sub 0.13.0 is prepared as a Windows x64 desktop release candidate and macOS arm64 preview build.

Validated areas:

• Windows x64 installer smoke.
• Windows x64 portable zip smoke.
• macOS arm64 dmg smoke.
• First-run setup checks.
• Default model installation flow.
• Local Faster Whisper transcription.
• Native whisper.cpp transcription.
• Local NLLB translation.
• No-key Bing/Google web translation for short subtitles in the packaged desktop app.
• Bilingual subtitle output.
• Subtitle burn-in.
• Diagnostics and redaction checks.
• Basic desktop screenshots.

Known Limitations

• Windows builds are unsigned. SmartScreen or antivirus reputation warnings may appear until code signing is configured.
• macOS builds are ad-hoc signed and not notarized. Gatekeeper may block them until the user removes quarantine and applies a local ad-hoc signature.
• Models are downloaded after installation and are not bundled with the app.
• The default local NLLB translation model is marked CC-BY-NC-4.0; users should review its non-commercial restriction before commercial or organizational use.
• Real OpenAI provider smoke is not part of the default automated test suite.
• Bing/Google web translation is experimental and best-effort; Windows x64 packaged short-SRT smoke has passed, and macOS arm64 web translation smoke still needs to run on a macOS release machine.

0.13.2 Artifact Checksums

0.13.1 Artifact Checksums

0.13.0 Artifact Checksums

Package Size

The Windows portable zip is large because it includes Electron/Chromium plus an app-private Python AI runtime. The package does not include ASR or translation model weights.

Privacy Notes

Fast Sub defaults to local workflows. Remote API or web providers require explicit user selection and confirmation before media or subtitle text is uploaded.

Related Pages

• Download Fast Sub
• Privacy
• Troubleshooting