What audio description software actually needs to do
Audio description software has one job most general video tools were never built for: finding the silences between dialogue, writing description that fits inside them, and getting a describer's voice — or a synthesized one — into that gap without stepping on a line of dialogue. That sounds simple. In practice it means the software has to solve four separate problems at once: detecting scene cuts and gaps, transcribing or flagging dialogue, giving the describer a place to write and time text, and producing a narration track. Most tools on the market solve one or two of those well and leave the rest to spreadsheets, stopwatches, and a separate recording session.
The feature checklist that actually matters
Scene and dialogue detection
Manually scrubbing a two-hour film for silent gaps is one of the biggest time sinks in AD production. Software that automatically detects scene cuts and transcribes dialogue removes that pass entirely; without it, every gap has to be found by ear.
Timeline or script view — ideally both
Some describers think in a timeline, dragging and retiming clips against picture. Others write faster in a linear script view with a running character count against each time slot. A tool that only offers one forces every describer to work against their instinct.
Built-in narration
If the software can't generate or record narration in the same window, the description has to leave the tool, get voiced separately, and come back in for sync — a second pass most workflows can't afford to repeat every revision. Local text-to-speech that voices a clip on approval, with no separate recording software, collapses that into one pass.
Compliance-ready exports
A finished description track isn't the deliverable auditors or broadcasters actually want — they want to see how it was produced. Software that logs every clip's timing, version history, and reviewer decision produces that record automatically. Without it, someone has to reconstruct it by hand before a compliance review.
Three categories of tools, and where each one breaks down
Generic video editors with AD "bolted on"
Premiere, Resolve, and similar NLEs can hold an AD track, but they weren't designed around the AD workflow — no dialogue-gap detection, no script view, no compliance export. Every step above still happens manually, in a tool built for a different job.
Free or web-based AD generators
Free tools are real, and worth using for a one-off short clip. They typically stop short on three things that matter for professional or repeat work: batch/project management, an audit trail, and offline processing for material that can't leave a secure environment.
Purpose-built desktop AD software
Software designed specifically for the AD workflow — detection, timing, writing, narration, and export in one place — is the smallest category, and the one built for describers doing this as their job rather than a one-off task.
Where Synchrogen fits
Synchrogen is a desktop AD editor built for the third category above: automatic scene and dialogue detection, a timeline and a script view you can switch between freely, built-in local text-to-speech narration, and a structured audit trail on every compiled track. It runs offline — video never leaves your machine — and is currently in closed beta at €25/month for individual describers, with team plans for AD service companies.
FAQ
Is there free audio description software?
Yes — several web-based tools generate a basic description track at no cost, and they're a reasonable choice for a single short clip. For ongoing professional work, most describers eventually need project management, an audit trail, and offline processing that free tools don't offer.
Do I need special software to add audio description to video?
Not strictly — an AD track can be recorded and mixed in any audio editor. Purpose-built AD software exists because doing that manually for every clip, on every project, is slow: finding gaps, avoiding dialogue, and syncing narration by hand is the work dedicated software automates.
What software do professional audio describers use?
There's no single standard — many describers still use a general NLE plus a separate recorder and a spreadsheet. That's exactly the gap purpose-built AD software closes: detection, writing, narration, and compliance export in one tool instead of four.