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

# Blended Cost per App Install: Cross-Platform Acquisition Efficiency

> Track your blended cost per app install (CPI) across Meta, Google, and TikTok. Measure mobile acquisition efficiency and optimize your app install campaigns.

<Tip>
  Blended Cost per App Install measures the average cost to acquire one mobile app install across all your advertising platforms combined.
</Tip>

## Formula

<Info>
  **Blended Cost per App Install** = [**Blended Spend**](/reference/metrics/advertising/blended/blended-spend/blended-spend) ÷ [**Blended App Installs**](/reference/metrics/advertising/blended/blended-conversions/blended-app-installs)
</Info>

### Formula Components

| Metric                                                                                                      | Definition                                                       |
| ----------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------- |
| [**Blended Spend**](/reference/metrics/advertising/blended/blended-spend/blended-spend)                     | Total advertising spend across Meta, Google, and TikTok combined |
| [**Blended App Installs**](/reference/metrics/advertising/blended/blended-conversions/blended-app-installs) | Total app installs attributed across all advertising platforms   |

| Metadata        |                                                                                                     |
| --------------- | --------------------------------------------------------------------------------------------------- |
| **Type**        | Currency                                                                                            |
| **Data Source** | [Meta Ads](/sources/facebook-ads), [Google Ads](/sources/google-ads), [TikTok Ads](/sources/tiktok) |
| **Aggregation** | Ratio                                                                                               |

***

## Example

Your app campaigns spent **\$15,000** across all platforms and generated **3,000 installs** in March.

| Platform    | Spend        | App Installs | CPI        |
| ----------- | ------------ | ------------ | ---------- |
| Meta Ads    | \$8,000      | 1,800        | \$4.44     |
| Google Ads  | \$5,000      | 900          | \$5.56     |
| TikTok Ads  | \$2,000      | 300          | \$6.67     |
| **Blended** | **\$15,000** | **3,000**    | **\$5.00** |

***

## How It Works

Blended CPI aggregates your total advertising spend and total app installs across Meta, Google, and TikTok, then calculates the average cost per install. This gives you a single efficiency metric that accounts for your entire mobile acquisition budget regardless of which platform drove the install.

***

## When to Use

| Scenario                         | Action                                                                          |
| -------------------------------- | ------------------------------------------------------------------------------- |
| Setting acquisition budgets      | Use blended CPI to establish target cost thresholds for mobile campaigns        |
| Comparing to industry benchmarks | Compare your overall CPI against category averages without platform bias        |
| Executive reporting              | Report a single efficiency metric that represents total mobile acquisition cost |
| Evaluating media mix             | Identify if shifting budget between platforms would lower overall CPI           |

***

## Related Metrics

| Metric                                                                                                  | Relationship                                  |
| ------------------------------------------------------------------------------------------------------- | --------------------------------------------- |
| [Blended Spend](/reference/metrics/advertising/blended/blended-spend/blended-spend)                     | Numerator — total cost driving app installs   |
| [Blended App Installs](/reference/metrics/advertising/blended/blended-conversions/blended-app-installs) | Denominator — total installs acquired         |
| [Blended CPA](/reference/metrics/advertising/blended/blended-efficiency/blended-cpa)                    | Similar efficiency metric for all conversions |

[See all Blended Conversions metrics →](/reference/metrics/advertising/blended/blended-conversions)