# Frequently Asked Questions

## About SmartSpectra

### What is SmartSpectra and how does it work?

SmartSpectra is a contactless health-sensing SDK that turns any camera into a real-time biometric sensor. It tracks facial and chest movements to extract anonymized health metrics including pulse rate, breathing rate, HRV, and more—all without requiring any wearables or physical contact.

### What physiological signals and features can SmartSpectra measure?

SmartSpectra can measure:
- Pulse rate
- Breathing rate
- Heart rate variability (HRV)
- Apnea detection
- Inhale/exhale ratio
- Upper/lower breath trace
- Respiratory line length
- Facial landmarks
- Blink/talk detection
- Relative blood pressure
- Emotional responses
- And much more

### How accurate is the SmartSpectra SDK?

Clinical trials demonstrate:
- **Heart rate**: Less than 1.62% RMSD differential versus hospital-grade equipment
- **Breathing rate**: Less than 1.71% RMSD differential versus hospital-grade equipment

Accuracy depends on proper lighting conditions and minimal motion during measurement.

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## Integration & Technical

### Which platforms and programming languages does SmartSpectra support?

SmartSpectra supports:
- **iOS** (Swift)
- **Android** (Kotlin)
- **Cross-platform C++**

Full documentation is available on GitHub, and integration typically requires under 10 lines of code.

### How do I integrate SmartSpectra into my app?

Integration is straightforward:
1. Sign up for an API key at [app.presage.tech](https://app.presage.tech)
2. Embed the SDK (under 10 lines of code)
3. Connect to the API
4. Select which biometrics you want to measure
5. Data begins streaming within 3-5 seconds

See our [Quickstart Guide](/docs) for detailed instructions.

### What environmental conditions are needed for accurate measurements?

For optimal results:
- **Distance**: Hold phone 1-2 ft away, or mount camera 3-5 ft away (rear camera works at 15-20 ft)
- **Lighting**: Minimum 60 lux (moderate indoor lighting)
- **Motion**: Moderate motion is acceptable, but stillness improves accuracy
- **Duration**: 30-60 seconds for complete measurement

### I want the tech, but I don't have a developer

No problem! We can host you and your users in our Sixth Sense app. No coding required—get instant presence for your new digital experience. [Contact us](https://presagetech.com/contact-us) for details.

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## Privacy & Data

### How does Presage protect privacy and handle user data?

Privacy is built into SmartSpectra by design:
- The SDK does **not** access or require any personal data to operate
- All results are delivered on a purely anonymized basis to your app
- No facial images or video are stored or transmitted
- Only anonymized metrics are used (with consent) for algorithm improvement

See our [Privacy Policy](https://physiology.presagetech.com/privacy-policy) for complete details.

### What data do you store?

By default, we do not store input data or predictions. The SDK processes video locally on-device and only transmits anonymized vital sign metrics.

Enterprise customers can configure:
- Prediction storage for audit trails
- Custom retention policies
- Data residency requirements

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## Regulatory & Clinical

### Is SmartSpectra a medical device or FDA-approved product?

SmartSpectra has passed clinical trials demonstrating accuracy comparable to hospital-grade equipment. However, it is **not yet FDA-approved as a medical device**.

Current intended use is for **wellness applications only**—not for diagnosis, treatment, or medical decision-making.

### How are your models validated?

All models undergo rigorous validation:
1. Internal validation on held-out test data
2. External validation at independent clinical sites
3. Prospective clinical trials comparing to reference devices
4. Ongoing performance monitoring across demographics

See our [Studies](/studies) page for published results and model cards.

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## Pricing & Plans

### Is there a free tier?

Yes! Our **Community Edition** is free and includes:
- Unlimited measurements for development
- All SDK features
- Community support via Discord
- Non-commercial use

No credit card required to start.

### What are the paid plans?

| Plan | Price | Best For |
|------|-------|----------|
| **Community** | Free | Learning, prototyping, non-commercial |
| **Business** | $0.007/measurement ($200/mo min) | Production commercial apps |
| **Enterprise** | Custom | Large scale, on-premise, custom needs |

See our [Pricing](/pricing) page for full details.

### Can I upgrade or downgrade anytime?

Yes. Plan changes are prorated and take effect immediately.

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## Getting Involved

### How do I get involved?

We welcome participation from:

**Students**:
- Use the free Community Edition for projects
- Try our Sixth Sense app for personal use

**Researchers**:
- We offer lab support for diagnostic development
- Academic partnerships available

**Developers**:
- Join our [Discord](https://discord.com/invite/K7KNmuX7KT) community
- Contribute to our [GitHub](https://github.com/Presage-Security/SmartSpectra) projects

[Contact us](https://presagetech.com/contact-us) to discuss your needs.

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## Support

### How do I get help?

| Channel | Best For | Response Time |
|---------|----------|---------------|
| [Documentation](/docs) | Self-service | Instant |
| [Discord](https://discord.com/invite/K7KNmuX7KT) | Community help | < 1 hour |
| support@presage.tech | Technical issues | 24 hours (Business), 4 hours (Enterprise) |

### How do I report a bug?

- **GitHub Issues**: For SDK bugs
- **Email**: support@presage.tech for API issues
- **Security vulnerabilities**: security@presage.tech

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## Still have questions?

- **Sales**: support@presagetech.com
- **Support**: support@presage.tech
- **Book a meeting**: [presagetech.com/contact-us](https://presagetech.com/contact-us)
- **Discord**: [discord.gg/presage](https://discord.com/invite/K7KNmuX7KT)