CardSync - Verified Copy
SD card or photos to SSD
$2.99 · Designed for iPad
Up to 4 files copied at once, each read back from the drive and verified. In the field, no computer. Interrupted? Run it again: only what is missing gets copied.
CardSync copies one folder to another and verifies every file it writes.
Memory card, SSD or USB-C stick, iCloud Drive and the services you have
installed, the iPhone itself: anything the Files app exposes works, in both
directions. The source can also be an album from your photo library.
The Files app can already move files. It cannot tell you whether the copy is
faithful, what is still missing, or resume where it stopped. That is what
CardSync does.
VERIFICATION
After each write, CardSync makes the system forget what it holds of the file,
then reads it back from the destination drive and compares its SHA-256 digest
with the original's. The original is then read again too, from the card: if the
two reads differ, the card reader is at fault, and the app tells you instead of
keeping corrupted data. This second read can be turned off. For a photo, the
comparison is made against the digest computed during the export.
ONLY WHAT IS MISSING
Both sides are analysed before anything is written. You see what would be copied
and then you decide. For a folder, three criteria to choose from: size, size and
date, or full digest. For an album, an item counts as backed up when the file
exists and carries its date.
SEVERAL FILES AT ONCE
Up to four files copied at the same time, your choice: the card reader reads
while the drive writes, instead of each waiting for the other.
LARGE VOLUMES AND LONG COPIES
Files are read and written in blocks, never loaded whole into memory: a 4 GB
video weighs no more than a photo. Analysing tens of thousands of files remains
a matter of seconds.
Running it again after an interruption — screen left, drive unplugged, battery
dead — copies only what is missing: what has already been verified is never
redone.
NOTHING IS EVER LOST
Every file is written under a temporary name, then put in place in one move,
once complete and verified. A file already present at the destination is never
deleted before its replacement is ready. An interrupted copy leaves no truncated
file behind, and the next sync picks up where it stopped.
PHOTO LIBRARY
Pick an album, a smart album, or the whole library, with a "from a date" filter.
CardSync exports the original file and, if you want, the Live Photo video, the
edited version, and a readable metadata sidecar (date, location, dimensions,
favourite, album). Items no longer stored on the device are fetched from iCloud
— an option you can turn off.
MIRROR MODE WITHOUT DELETION
For a folder source, if you want the destination to mirror the card, extra files
are moved into a dated folder — never deleted. And if part of the source could
not be read, mirror mode disables itself: a temperamental drive must never make
a valid backup look like an obsolete file.
WHAT YOU SEE
A bar for each file in progress, with its step — copy, read-back — plus
throughput, time left, a detailed log and a history. An honest summary at the
end: what was copied, verified, set aside, and what failed.
WHAT DOES NOT LEAVE YOUR DEVICE
No account, no tracking, no advertising, no data collected, no server of ours.
Traffic happens only when you ask for it, and always between your device and
your own accounts: fetching your photos from iCloud, which can be turned off,
and transfers performed by an online service if you pick one of its folders as
source or destination.
GOOD TO KNOW
iOS does not allow copying to an external volume in the background: keep
CardSync on screen during the transfer. The app prevents the screen from
locking, and if you leave, the sync resumes next time. For large volumes a
powered USB-C hub is strongly recommended.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• Up to four files copied at once (adjustable): the card reader reads while the drive writes.
• Stronger verification: every copy is read back from the drive itself, and the original a second time from the card (can be turned off). In earlier versions these read-backs could be served from the device's memory rather than from the drive.
• A progress bar for each file in progress, with its current step.
• The drive is told to write everything out before a copy is reported complete — useful if you unplug it right away.
• A destination drive that is still locked, full or read-only is reported at once, in a single message, instead of one error per file.
The developer, Laurent Meurisse, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Laurent Meurisse
- Size
- 1.9 MB
- Category
- Photo & Video
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and French
- Age Rating
4+
- 4+
- Copyright
- © 2026 Laurent Meurisse
