Compare / Sound Off vs CapCut
Sound Off vs CapCut
CapCut is a powerful editor. It also tracks you, collects your content, and is made by ByteDance. Sound Off does one job, captions, and does it without your video ever leaving your iPhone.
What each app collects
Straight from the App Store. Every app declares its data practices to Apple. Here's what each one says about itself.
CapCut by ByteDance Pte. Ltd
- Used to track you
- Identifiers
- Linked to you
- Contact Info, Identifiers, Diagnostics, User Content, Usage Data
App Store privacy label, June 2026
Sound Off by Joylord Systems Ltd
- Data not collected
- The developer does not collect any data from this app.
App Store privacy label, June 2026
"User Content" means your videos and photos. CapCut's label says it's collected and linked to your identity. Sound Off's label says nothing is collected at all.
The part nobody reads
In March 2026 the FBI told Americans to "read the terms of service or end user license agreement before downloading apps," and warned about apps "particularly those based in China," which are "subject to China's extensive national security laws."
The FBI didn't name any app. But CapCut is made by ByteDance. So we read CapCut's terms for you. Here is the licence you grant by editing in it:
"By submitting User Content via the Services, you grant to the Company and its affiliates a non-exclusive, royalty-free, transferable, sub-licensable, perpetual and worldwide licence to use your User Content… to modify, adapt, reproduce, make derivative works of, display, publish, transmit, distribute and/or store your User Content."
CapCut Terms of Service
A broad content licence like this is normal for a cloud service: it has to host and process your video on its servers to work. That's the whole point. Sound Off needs no such licence, because it never receives your video in the first place.
On your phone, not their servers
Sound Off transcribes, styles, and exports entirely on your iPhone, using Apple's on‑device speech model. There is no upload, no account, and nothing to grant a licence to.
Put your iPhone in airplane mode.
Sound Off still works.
Try that with a cloud editor.
Pay once, not every month
CapCut's Pro runs as a recurring subscription. Sound Off is a single purchase: you pay once and it's yours.
To be fair to CapCut: it does far more than captions: multi-track editing, effects, a huge template library. If you want a full editor, it's a capable one. Sound Off isn't trying to replace it. It does one thing (stylish, accurate captions for vertical video) and it does that one thing privately, on your device, for a one-time price.
Captions that stay on your phone.
On‑device transcription, twelve caption styles, a one‑time purchase.
Sources
Privacy practices are quoted from CapCut's and Sound Off's App Store privacy labels ("App Privacy", captured June 2026) and from CapCut's published Terms of Service. The FBI quotes are from FBI IC3 Public Service Announcement I‑033126‑PSA (31 March 2026), which names no specific apps. CapCut is a product of ByteDance Pte. Ltd. Labels and terms can change; quotes reflect June 2026.