A dark mode for iOS 11.

iOS 12?

Check out Noctis12
Features:
Includes three modes for apps to darkify your whole device.
System, Smart Invert and Compatibility.
Includes a control center toggle for easy of access.
If you're unable to install libcolorpicker-neptea in Cydia this is a Cydia bug and you must install the dependancy manually. A link to the deb is here:
http://apt.thebigboss.org/repofiles/cydia/debs2.0/libcolorpickernepeta_1.6.2-3.deb

Return Policy

Change of Mind:

Change of mind returns are allowed within 24 hours of purchase being made under acceptable circumstances. Excessively rude or vulgar refund requests will be rejected.

Issue Based Return:

Refunds requested due to issues such as safe modes or graphical bugs must provide clear details of the issue. Further information may be asked if the request is ambiguous using the Packix Support Chat function. Refund requests may be closed if no respose is made within 7 days. If If the issue cannot be resolved within 7 days issue verification a refund will be provided.

Other Returns:

If you refund request does not fall within one of the above categories the request will be evaluated at my own discretion.

Please Note:

Processing of refunds can take up to 7 days and if accepted funds should be made avaliable within 3-5 business days dpending on method of payment.
I reserves the right to reject refunds at my own discretion. Frequent returns are closely monitored. Excessive returns by a single user will be flagged and potentially refused at my discretion. Failure to read the description of the tweak and in turn this policy will result in a request being declined.