---
title: Shared Storage API - Definition & Examples | RGM® Glossary
url: https://realgrowthmatters.com/glossary/shared-storage-api/
updated: 2026-06-10
source_html: https://realgrowthmatters.com/glossary/shared-storage-api/
---

Growth Glossary — Definition

SHT SHARED-STORAGE

# Shared Storage API

Privacy Sandbox cross-site storage A working definition from the RGM marketing glossary.

Privacy Sandbox cross-site storage

Term
:   Shared Storage API

Field
:   Audience & Privacy

Category
:   Audience & Privacy

## Definition in plain terms

Worth a slow read.Treat Shared Storage API as an audience or privacy concept with a clear scope. Two people using the term should mean the same thing.

Privacy Sandbox cross-site storage

Shared Storage API is a audience & privacy term for an audience or privacy concept. Agree the scope and two people stop talking past each other.

## The mechanics

Look at it this way.Shared Storage API works one way for a lean team and another for a large one. The mechanics follow the context.

Think of Shared Storage API as context-bound. A small shop reads it simply; an enterprise reads it with more nuance. That is normal -- Shared Storage API is shaped by audience and channel mix. Read Shared Storage API without care and the plan wobbles; be precise and the read holds.

One rule always holds. Settle the scope of Shared Storage API up front, then build the plan. Get it backwards and Shared Storage API becomes a word everyone uses and no one shares. Hold that thought.

## Where it shows up

Keep this in mind.Use Shared Storage API when it changes a choice. If it is not driving a decision, it is vocabulary, not leverage.

Use Shared Storage API when it changes an outcome. For audience & privacy teams, that tends to be three recurring moments. With no choice live, Shared Storage API is good to know, not to chase.

1. **Setting budget.** Shared Storage API clarifies which budget line deserves more.
2. **Choosing a metric.** Shared Storage API separates a causal read from a coincidence.
3. **Comparing options.** Shared Storage API corrects two options that look alike but are not.

## An example with real numbers

Pick one definition.Below, Shared Storage API is put inside a The New York Times setting -- real trade-offs, a clear baseline, and a figure to test it.

Take The New York Times. During a first-party data shift, the team made Shared Storage API the deciding input, not an afterthought. They set a baseline first, agreed one definition of Shared Storage API, and only then read the result: logged-in readers passed 60% of ad revenue. The number matters less than the order.

Example walk-through for Shared Storage API -- figures illustrative, RGM analysis

| Stage | What the team did | Why it mattered |
| Baseline | Took a before reading on Shared Storage API. | A reference to judge against. |
| Define | Locked the scope of Shared Storage API so it stayed stable. | Two people, one meaning. |
| Act | A first-party data shift — one variable. | One change, a clean read. |
| Result | Logged-in readers passed 60% of ad revenue | An outcome you can trust. |

Treat the Shared Storage API figures as illustrative, labeled RGM analysis. Reuse the sequence, not the digits.

## Mistakes worth avoiding

One idea, plainly put.Teams slip on Shared Storage API in four familiar ways. Each makes a soft assumption look like a precise number.

- **One blanket rule.** Applying Shared Storage API the same way everywhere. Split it by audience, channel, and business model.
- **Bare numbers.** Showing Shared Storage API on its own. Context is what makes it readable.
- **Wrong target.** Treating Shared Storage API as the goal. The goal is the outcome it predicts.
- **Bad compares.** Benchmarking Shared Storage API with no adjustment. Account for the model differences first.

## Quick answers

How is Shared Storage API defined?

Privacy Sandbox cross-site storage Settle what Shared Storage API covers first; the strategy follows from there.

Why does Shared Storage API matter for marketers?

Shared Storage API shows up in budget reviews and channel reporting. Use it loosely and teams pull apart; use it precisely and the numbers line up.

Where does Shared Storage API get used?

Shared Storage API informs a decision -- most often a budget, a metric choice, or a comparison. The The New York Times example above shows the pattern.

Where do teams slip up on Shared Storage API?

Treating Shared Storage API as one blanket rule and reporting it with no baseline. Both hide a soft assumption.

How is Shared Storage API defined?
:   Privacy Sandbox cross-site storage Settle what Shared Storage API covers first; the strategy follows from there.

Why does Shared Storage API matter for marketers?
:   Shared Storage API shows up in budget reviews and channel reporting. Use it loosely and teams pull apart; use it precisely and the numbers line up.

Where does Shared Storage API get used?
:   Shared Storage API informs a decision -- most often a budget, a metric choice, or a comparison. The The New York Times example above shows the pattern.

### Go deeper

### Related terms