> ## Documentation Index
> Fetch the complete documentation index at: https://docs.symetri.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Device & Storage Requirements

> Compatible iPhone models, performance expectations, storage planning, and camera recommendations.

## Compatible Devices

### Minimum Requirements

| Requirement | Minimum                                 |
| ----------- | --------------------------------------- |
| Device      | iPhone with A12 chip or later           |
| iOS version | iOS 17.0 or later                       |
| Storage     | 1 GB free (minimum); 10 GB+ recommended |

### iPhone Compatibility

| Model                   | Supported | Performance   |
| ----------------------- | --------- | ------------- |
| iPhone 16 Pro / Pro Max | ✅         | Excellent     |
| iPhone 16 / Plus        | ✅         | Excellent     |
| iPhone 15 Pro / Pro Max | ✅         | Excellent     |
| iPhone 15 / Plus        | ✅         | Excellent     |
| iPhone 14 Pro / Pro Max | ✅         | Excellent     |
| iPhone 14 / Plus        | ✅         | Excellent     |
| iPhone 13 Pro / Pro Max | ✅         | Very Good     |
| iPhone 13 / mini        | ✅         | Very Good     |
| iPhone 12 Pro / Pro Max | ✅         | Good          |
| iPhone 12 / mini        | ✅         | Good          |
| iPhone 11 Pro / Pro Max | ✅         | Good          |
| iPhone 11               | ✅         | Fair          |
| iPhone XS / XR / X      | ✅         | Slow          |
| iPhone 8 / 8 Plus       | ✅         | Slow          |
| iPhone 7 or earlier     | ❌         | Not supported |

<Note>Symetri is an iPhone app. It will run on iPad in compatibility mode, but the UI is designed for iPhone portrait orientation and is not optimized for iPad use.</Note>

***

## Performance by Feature

### Face Alignment

Runs every time you open a case.

| Device generation   | Speed                      |
| ------------------- | -------------------------- |
| iPhone 13 and later | Near-instant (\< 1 second) |
| iPhone 11–12        | 1–2 seconds                |
| iPhone X–XS–XR      | 2–4 seconds                |

### Background Removal

The most demanding operation in the app.

| Device generation   | Speed per image |
| ------------------- | --------------- |
| iPhone 13 and later | 2–4 seconds     |
| iPhone 11–12        | 4–8 seconds     |
| iPhone X–XS–XR      | 8–15 seconds    |

### Video Export

| Format     | iPhone 14+ | iPhone 11–13 | iPhone X–XS |
| ---------- | ---------- | ------------ | ----------- |
| Feed 4:5   | 10–20 sec  | 20–40 sec    | 40–90 sec   |
| Story 9:16 | 15–30 sec  | 30–60 sec    | 60–120 sec  |

***

## Optimizing Performance

<AccordionGroup>
  <Accordion title="Keep the device cool">
    iPhones throttle the processor when they overheat. Remove the case during intensive operations, avoid direct sunlight, and give the device a 5-minute break between large batch exports.
  </Accordion>

  <Accordion title="Keep battery above 20%">
    iOS activates Low Power Mode at 20%, throttling the CPU and GPU. Keep the device plugged in during batch exports.
  </Accordion>

  <Accordion title="Close background apps before large exports">
    Double-press the Home button (or swipe up and hold) and swipe away apps you don't need. This frees RAM for image processing.
  </Accordion>

  <Accordion title="Restart weekly">
    For devices used heavily in a clinical setting, a weekly restart clears accumulated memory and keeps the system running cleanly.
  </Accordion>
</AccordionGroup>

***

## Storage Requirements

### Per-Case Storage Estimates

| Case type    | Photo pairs | Approx. storage |
| ------------ | ----------- | --------------- |
| Single angle | 2           | 8–15 MB         |
| 3-angle      | 6           | 25–45 MB        |
| 5-angle      | 10          | 40–75 MB        |

### Library Size Estimates

| Cases     | Mix                 | Approx. total |
| --------- | ------------------- | ------------- |
| 50 cases  | Mostly single-angle | 500 MB – 1 GB |
| 100 cases | Mixed               | 2–3 GB        |
| 200 cases | Mostly 3-angle      | 5–8 GB        |
| 500 cases | Mostly 3-angle      | 12–20 GB      |

### Recommended iPhone Storage

| Practice volume                  | Recommended storage |
| -------------------------------- | ------------------- |
| Solo injector, \< 50 cases/year  | 128 GB              |
| Solo injector, 50–200 cases/year | 256 GB              |
| Multi-injector or high volume    | 256–512 GB          |

***

## Camera Recommendations

### Use the 1× Main Lens

The 1× lens produces the least distortion and is most consistent across iPhone models. It's the default when you open the Camera app.

<Warning>
  **Avoid:**

  * **0.5× ultrawide** — barrel distortion warps facial proportions and confuses face detection
  * **Digital zoom** — degrades image quality; face detection requires sharp, clear images
  * **Portrait mode** — applies a software depth effect that can interfere with background segmentation
</Warning>

### Resolution Setting

On iPhone 14 Pro and later, you can shoot in 48MP or 12MP. Symetri processes images at 2048px for alignment — 12MP is recommended for faster imports with identical alignment quality.

**To set:** Settings → Camera → Formats → choose **High Efficiency** (12MP default).

***

## Checking Available Storage

1. Go to **Settings → General → iPhone Storage**.
2. Scroll to find **Symetri** in the app list to see exactly how much it's using.

<Tip>If Symetri is using more storage than expected, close and reopen the app. Temporary export files are cleaned up on launch.</Tip>

***

## Keeping Symetri Up to Date

Always keep both iOS and Symetri updated. Symetri's face detection and background removal features use iOS's built-in Vision framework — Apple improves this with each iOS release.

<Warning>Before any major iOS update, back up your device via iCloud or Mac first. Symetri data is included in iPhone backups.</Warning>