The whole shoot day,
synced by sound.
Drop the camera and recorder folders, press Sync, and import the XML into Premiere or DaVinci Resolve. Your footage arrives organized, each camera on its own track, ready to cut.
Version 1.0 · 23 August 2026
Three steps from card to cut
The path an assistant would take by hand, done by a machine that pays the same attention to clip 1 and clip 242.
Drop the footage
Whole folders, mixed frame rates, cameras and recorders together. Sincou reads the metadata right away and draws the timeline before analyzing anything.
Press Sync
The engine compares waveforms and aligns every clip to the millisecond. Each pair gets a confidence score, and triage separates what is locked, what deserves a look, and what fell outside.
Export the XML
A timeline with one track per camera, audio underneath, and your raw folders turned into bins. Opens in your editor with media online.
You already know this flow
PluralEyes taught a generation of editors to trust sound for syncing. Sincou follows that path and runs native on today's Macs.
What stays the same
- Drop the whole day and let the audio resolve the alignment
- One timeline per recording block, every angle on its own track
- XML that opens straight into Premiere and DaVinci Resolve
What Sincou adds
- Native on Apple Silicon, with audio processed on your own Mac
- Verified card backup inside the same application
- A player to check the sync by ear before exporting
- One license, bought once
One window for the whole day
What usually takes three separate programs happens in one place.
23.976 and 59.94 in the same project
Every file enters the XML at the rate it was shot, which is exactly what keeps media online when a project mixes cameras.
Listen before you export
Click anywhere on the timeline and hit play: Sincou mixes the cameras under the cursor in real time. Aligned sounds like one source, and your ear confirms the sync before the footage ever reaches the NLE.
Three states, one color each
Locked, review and out of sync, marked on the timeline and inside the XML. You look straight at the few clips that need attention.
Native script included
One command under Workspace › Scripts syncs the open bin and builds the timelines from inside Resolve, with clips linked to the Media Pool and triage already colored.
Matching TC for multicam
On export, Sincou writes the same timecode across every camera and your editor's native multicam groups them on its own. Your files stay untouched.
Everything happens on your Mac
Footage is read from disk, processed on your CPU and handed back as XML. The support report, when you choose to send one, carries only numbers and nicknames.
The card arrives whole, and you have proof
Before any syncing comes the most fragile moment of the day: the footage lives on a single card. Sincou copies it, checks it byte for byte, and records what happened to every file.
Byte-for-byte verification
Every file is read back from the destination and compared against the source. A failing card returns the right size with the wrong bytes, and reading back is what reveals that while the card is still in the reader.
Space checked before the first byte
Sincou adds up what it is about to copy and compares it against the disk before starting. Finding out the drive is full on file 15 of 63 is the worst possible moment, so the math comes first.
Structure built as you type
Pick the date, the job and the camera, and the real path appears on screen while you type. What you see is literally the folder that will exist on the drive.
Errors in plain words, on the file's own line
Disk full, permission denied, failing card. The log states the reason on the line of the file it happened to, and lifts the dominant reason to the top, so you know what to fix before trying again.
/Volumes/DG REALTIME/2026_08_21_WORK/CAM_A/C0043.MP4
It arrives ready in your editor
Open the file in Premiere: media links itself and your raw folders become organized bins.
File › Import › Timeline and media links itself, the same way. The included script does the whole path from inside Resolve.
A file in Final Cut's own format, carrying the tracks and the sync offsets.
Offsets, confidence and triage for every clip, to check by eye or feed your own script.
Built by someone who edits all day
Syncing multicam by hand was always the toll booth before editing could really start. I wanted out of it early on, but the automatic tools I tried could not handle my projects: the good ones require a subscription, and the ones that fit my budget choked on exactly the large files.
So, out of my own routine, I built Sincou and tested it on real full-day shoots, with several cameras and a recorder. The heaviest session it has handled holds 242 clips over 7.6 hours, and it is the same one I run every change against: if it fails there, I find out before you do.
Sincou is free for seven days with no restrictions, and free forever for up to 10 clips at a time. It exists to take the manual syncing routine off your hands and give that time back to the part that matters: editing.
Buy once, it's yours
Start with seven days fully unlocked. When they run out Sincou stays yours, syncing projects of up to 10 clips, with no expiry date. The license lifts the cap and is bought once.
- 7 days fully unlocked, no limits
- After that, up to 10 clips at a time, no deadline
- Clean XML, production ready
- Download and open, no sign-up
- One license for your Mac
- Sync, ingest, player and every export
- DaVinci Resolve script included
- Updates throughout version 1.x
In Brazil: R$ 249 and R$ 599, with the same contents.
The engine already runs cross-platform. The packaged Windows version comes next.
Before you download
Do I need a slate or jam-synced timecode?
Sincou works with the sound your cameras and recorder captured from the same event, so all it needs is audio on every file. When timecode exists, it comes in as a cross-check and warns you if it disagrees with the audio.
What if the camera audio is bad?
That's the common case, and the engine was built for it. The comparison uses the instants where sound attacks, which are the same in any microphone in the room, independent of gain, distance and frequency response. A second stage then refines the alignment to sample accuracy.
Does it work with different frame rates?
Yes. The shoot day used for validation had 23.976 and 59.94 in the same project, with 48 kHz audio. The XML declares each file at its own rate, which is what guarantees the link inside the NLE.
What happens to footage that falls out of sync?
It goes to the end of the timeline, marked in color, separate from the material that locked. Sincou would rather point at a doubtful clip than hand you an alignment you'd discover was wrong in the screening room.
How many clips can it handle at once?
The heaviest validation so far was a shoot day of 242 clips, 7.6 hours of footage, two cameras and two recorders, processed in one pass on a MacBook.
Do I need to install anything else?
Nothing. Sincou ships with everything it needs to read media, decoder included. Download it, drag it to Applications, open it.
What happens when the 7 days are up?
Sincou keeps working. It moves to free mode, which syncs projects of up to 10 clips at a time, with no deadline and no watermark on the XML. Bigger shoot days call for the license, and that is bought once.
Does the license expire or turn into a subscription?
Neither. You buy it once and it is yours, with version 1.x updates included.
How do I get my key after buying?
It arrives in your inbox within seconds, automatically, alongside the receipt. Paste it into the app, press Activate, and you are done. If you cannot find the message, check your promotions folder before writing to us.
I lost my key. What now?
It is in your purchase email. If you cannot find the message, write to support from the address you bought with and we resend it right away.
Do I need internet to work?
Only once, when you activate, and only to count how many machines the key is on. After that, never again: the key is signed and Sincou checks it inside your own Mac, with no deadline and no server. You can spend the whole shoot in airplane mode.
Can I install it on more than one computer?
The Sincou license covers one Mac, and Studio covers three. Moving machines is free: you release the seat from inside the app, under License > Release this Mac, and activate on the other computer. If the old Mac is no longer with you, support frees the seat. Reinstalling the system on the same Mac does not cost a seat.
Is there a Windows version?
In development. The engine is already cross-platform, and the packaged Windows version comes next.
Does my footage go to a server?
Processing is entirely local: the app reads files from your disk and writes the XML back to it. Everything happens inside your own machine, offline.
Your next shoot day can start already assembled.
Download it, drop the folders, and watch the footage fall into place.