If you want something more consistent, the Xnspy monitoring app is a more reliable route. Instead of relying on previews or tricks, it pulls Snapchat chats directly from the device data, so you can view messages without triggering the “opened” status at all. That means no guessing, no timing tricks, and no risk of accidentally sending a read receipt.
That said, it’s not perfect either:
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It needs a proper setup and access to the target device
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Some features may vary between Android and iOS
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It’s not a real-time “peek” like notifications; you’re viewing synced data
So yeah, previews are fine for quick glances, but if you’re looking for something more stable and less hit-or-miss, Xnspy is definitely a better option comparatively.