When the Apple Watch becomes available for pre-order on April 10th next month, customers will have to decide between two different sizes: 38mm and 42mm. Deciding between the two sizes may be difficult if you want to buy one before they begin shipping on April 24th, so the Watch will go on display at Apple Stores two weeks ahead of its launch.

You might not be able to visit a crowded Apple Store just to make that decision, and Apple (mostly) has that covered too. Buried inside the Apple Store app for iPhone is an actual size comparison for each case size. The mockup shows the casing of the Apple Watch with the home screen icons displayed, and you can tap to toggle between the smaller and larger cases.

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The size comparison makes one thing very clear: both Apple Watch sizes are much smaller than what you’re probably used to seeing. If you put your iPhone over your wrist to simulate trying on each Watch size, you’ll likely decide that one either feels too small or too big, helping you make your decision easier.

As mentioned above, the Apple Watch size comparison is somewhat buried within the Apple Store app on iPhone. To find it, open the Apple Store app, tap the ‘Learn more’ link under the Apple Watch banner at the top, tap the ‘VIEW PRICING’ button on the top right corner, then tap ‘Compare case sizes’ near the top center.

Now can you virtually try on both Apple Watch case sizes. For a more mathematical approach, you can follow Apple’s official sizing guide with band sizes to prepare for your purchase.

Like the iPhone 6 and iPhone 6 Plus, the Apple Watch with the larger display will have better battery life, but the smaller display will obviously serve people who do not want a larger watch on their wrist. The smaller Apple Watch is also less expensive in each collection.

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