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Every iOS app needs a unique Bundle ID — a reverse-DNS string like com.reylabs.myapp — that Apple uses to identify your app across the App Store, App Store Connect, provisioning profiles, and services like Push Notifications and iCloud. You register the Bundle ID once in your Apple Developer account, then reference it when you create your app listing in App Store Connect.

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Prerequisites

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Choose a Bundle ID

Bundle IDs follow reverse-DNS notation and must be globally unique across all of Apple’s ecosystem.
  • Lowercase letters, numbers, and dots. Hyphens are allowed but not conventional.
  • Reverse-DNS style: start with your domain in reverse, then the app name. Example: com.reylabs.taskflow.
  • Must be unique across all of Apple’s registered Bundle IDs — you cannot reuse one another developer has claimed.
  • Cannot be changed after your app is submitted to the App Store, so pick carefully.
  • com.acme.notes
  • io.reyapp.taskflow
  • com.yourcompany.yourapp
  • MyApp — not reverse-DNS.
  • com.apple.myapp — you cannot use Apple’s namespace.
  • com.acme.notes.v2 — don’t include version numbers.
Choose your Bundle ID carefully. It cannot be changed once your app is submitted to the App Store, and it must match the identifier you configure in Rey.

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Register the Bundle ID

1

Sign in to the Apple Developer portal

Go to developer.apple.com/account and sign in with the Apple ID tied to your developer account.
2

Open Identifiers

In the sidebar, click Certificates, Identifiers & Profiles, then click Identifiers.
3

Add a new identifier

Click the + button next to “Identifiers”. Choose App IDs, then click Continue.
4

Choose the App type

Select App (the default) and click Continue.
5

Enter a description and Bundle ID

  • Description: A human-readable name, e.g. TaskFlow production app. This is for your reference only.
  • Bundle ID: Choose Explicit and enter your reverse-DNS Bundle ID (e.g. com.reylabs.taskflow).
6

Select capabilities (optional)

Enable any Apple services your app uses — for example Push Notifications, Sign in with Apple, or iCloud. You can enable more later.
7

Register the identifier

Click Continue, review the details, then click Register. Your Bundle ID is now reserved and ready to use.

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Add the Bundle ID to Rey

1

Open Publish settings in Rey

In the Rey editor, click Publish in the toolbar and select App Store as the target.
2

Paste your Bundle ID

In the iOS settings section, paste the exact Bundle ID you registered in the Apple Developer portal.
3

Save

Rey uses this Bundle ID when it signs and submits your build. It must match your Apple Developer identifier exactly — typos will cause the submission to fail.

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Next steps