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On-device vs cloud transcription: where do your recordings go?
Most transcription apps send your audio to a server. Some never let it leave your phone. Here's the difference, and why it matters for conversations that shouldn't leave the room.
14 September 2026 · 5 minute read
The short answer
- Cloud transcription: your recording is uploaded to a company's servers, turned into text there, and usually stored in your account.
- On-device transcription: your phone does all the work. The audio never leaves it.
What happens to a recording in a cloud app
The journey is usually the same, whichever app you use:
- You record. On your phone, laptop, or a bot that joins your video call.
- The audio is uploaded to the provider's servers, which may be in another state or another country.
- Their computers turn it into text.
- The recording and transcript are stored in your account, so you can see them on other devices and share them with your team.
Depending on the service and its terms, your data may also be:
- kept for a while after you delete it, for example in backups
- listened to or read by staff, to check quality
- used to train AI models, sometimes unless you opt out
None of this is hidden. It's usually in the privacy policy or terms. But very few people read them before pressing record.
Why it matters
Every copy of a recording on someone else's server is a copy you don't fully control:
- It can be breached. Any company's systems can be hacked, and a transcription service holds exactly what an attacker wants: private conversations, already turned into searchable text.
- It can be demanded. A provider that holds your data can be served with a subpoena or court order for it, sometimes without you being told first.
- It can be kept longer than you think. How long it's kept is decided by the provider's policy, not by you.
- Other people are involved. The people you record may never have agreed to a third party hearing them.
For some jobs, this goes beyond personal preference:
- Lawyers have a duty to make reasonable efforts to keep client information confidential. Handing client conversations to an outside company is something to weigh carefully.
- Clinicians in the US generally need a business associate agreement with any cloud service that handles patient information on their behalf.
- Therapists hold some of the most sensitive conversations there are.
- Journalists can expose a source if a provider holding their interviews is forced to hand them over.
How on-device transcription works
Recent iPhones are powerful enough to run speech recognition themselves, with no server involved. TaciVox, for example, works like this:
- Download the speech engine once. After that, the app doesn't need the internet.
- Record. The audio is locked (encrypted) the moment it's captured.
- Transcribe on the phone. The text never leaves the device, and neither does the audio.
- Keep it locked. Recordings and transcripts sit in a vault that only your passphrase opens. There's no account, and no copy anywhere else.
The easiest test of any app that says it works on the device: turn on airplane mode and try it. If it still transcribes, your audio isn't going anywhere.
An honest comparison
Cloud transcription isn't bad. It's a trade-off. Here's where each one wins:
| Cloud | On-device |
|---|
| Where your audio goes | To the provider's servers | Nowhere. It stays on the phone |
| Who could access it | You, the provider, and anyone who gets into their systems or makes a legal demand | Only someone with your phone and your passphrase (or recovery code) |
| How long it's kept | The provider's policy decides | You decide |
| Works without internet | Usually not | Yes |
| Account needed | Usually | Not necessarily (TaciVox has none) |
| Joins Zoom or Teams calls for you | Often, with a meeting bot | No. You record in the room or on speaker |
| Sync across devices and teams | Yes | No, and that's the point |
| Speed and accuracy | Very good, on any device | Very good on recent iPhones. Older phones are slower, and the best engines are a big download |
If you want a bot in every meeting and transcripts shared across a team, cloud is built for that. If the conversation shouldn't leave the room, on-device is.
Questions to ask any transcription app
- Does my audio leave my device? Does the app work in airplane mode?
- Where are the servers, and who at the company can access my recordings?
- How long are recordings and transcripts kept, and what really happens when I delete one?
- Is my data used to train AI, and can I say no?
- Is my data encrypted so that even the provider can't read it?
- Do I need an account, and what does the company know about me?
A good provider will answer these clearly. If the answers are hard to find, that tells you something too.
The bottom line
For everyday notes, cloud transcription is convenient and often fine. For client meetings, patient consultations, therapy sessions and source interviews, the safest copy of a conversation is the one that never left your phone.
This article is general information, not legal or compliance advice. Check your own professional rules.
TaciVox is coming to the iPhone
Private transcription that stays on your phone: no upload, no account, and everything locked with a passphrase only you know. Join the waitlist and we'll send you one email when it launches.
One email at launch, sent through Resend. Never shared. Privacy