On-Device vs Cloud Transcription: Which Protects Your Privacy Better?
We compare on-device and cloud audio transcription. Learn why local processing is safer for confidential meetings.
When you record a meeting with an AI tool, your audio goes somewhere. The question is: where?
Cloud transcription: how it works
Most popular tools (Otter.ai, Fireflies.ai, tl;dv) use cloud transcription. This means:
- Your audio is recorded on your device
- It’s sent to external servers (usually AWS or Google Cloud)
- An AI model on those servers processes the audio
- The resulting text is sent back to your device
The problem
- Your audio travels over the internet and is temporarily stored on third-party servers
- Even with TLS encryption, the provider has access to your audio in clear text during processing
- In regulated industries (healthcare, legal, finance), this can violate regulations like HIPAA, GDPR, or local data protection laws
- If the provider suffers a security breach, your confidential information is exposed
On-device transcription: the private alternative
On-device transcription processes everything directly on your phone or computer, without sending audio to any server:
- Your microphone captures the audio
- A local AI model processes the audio directly on the device
- Text appears on screen immediately
- Audio is discarded — never stored or transmitted
The advantages
- Zero data leakage: Your audio literally never leaves the device
- Works without internet: Perfect for in-person meetings or travel
- Lower latency: No network round-trip, words appear instantly
- Regulatory compliance: No data transfer to third parties
The limitation
On-device models are smaller than cloud ones, which historically meant lower accuracy. However, modern smartphone processors have significantly closed this gap.
Direct comparison
| Aspect | Cloud | On-Device |
|---|---|---|
| Privacy | Audio sent to servers | Audio never leaves device |
| Internet | Requires connection | Works offline |
| Latency | 200-500ms | <50ms |
| Accuracy | High (large models) | High (modern processors) |
| Cost to user | Higher (cloud infrastructure) | Lower |
| Compliance | Complex | Simple |
When to choose each option
Choose cloud if you need features like advanced multi-speaker diarization or simultaneous translation to 50+ languages with maximum accuracy.
Choose on-device if privacy is a priority, you work in a regulated industry, need offline functionality, or simply don’t want your audio passing through third-party servers.
Aura Meet: the best of both worlds
Aura Meet uses a smart hybrid approach:
- Transcription: 100% on-device. Your audio never leaves your phone.
- AI features (summaries, copilot): Only the transcribed text (not audio) is sent encrypted with TLS 1.3 to generate insights.
This way you get the privacy of local transcription with the power of cloud language models — without compromising your audio.