Silver Steel

I can never rate these guys highly enough. Always helpful and superb service. The best of the best! Finally, a pop-up app that actually works and has a good interface so you can customise the design easily. Excellent work. Support is very fast and friendly.

Poor form to suddenly decide to start charging for this app and not notify users who have supported you for so long. Instead, you just disabled the app so it wouldn't work anymore with no warning. Seems to be the pick of the bunch of the pop-up apps. Lots of custom features make this a user-friendly experience.