Is there a separate IBKR Mobile app for IBKR Lite?

No, there is not a separate IBKR Mobile app for IBKR Lite users. However, the app will not offer all of the features that are available to IBKR Pro users.

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Can I use the API with an IBKR Lite account?
Can I have one account as IBKR Lite and one account as IBKR Pro?
Can I have one account as IBKR Lite and one account as IBKR Pro with IBKR Singapore?
Can I subscribe to research data with an IBKR Lite account with IBKR Singapore?