The phrase "allow users to simply" is correct and usable in written English.
It can be used when describing a feature or functionality that makes a process easier for users.
Example: "The new software update will allow users to simply drag and drop files into the application."
Alternatives: "enable users to easily" or "permit users to effortlessly".
Use your smartphone's functions iPhones running on the iOS 7 operating system and above allow users to simply open a contact card and selecting Block Contact.
Sites like Etsy.com make it easier to reach a market, and others, like Quirky.com, allow users to simply suggest an idea and share the royalties if it makes it to the market.
As scientific workflows stipulate a process or computation to be executed in the form of data flow and task dependencies that allow users to simply articulate multi-step computational and complex tasks.
For example, Omniar is working with real estate companies to allow users to simply snap a photo of a home which then returns information about it.
Micro services can easily integrate multiple systems, micro apps can present them as easy-to-consume user interfaces and micro flows allow users to simply complete tasks across systems.
Using this new SMS functionality, that developer could allow users to simply text a query like "When is the next ferry?", to which the application could automatically send a reply.
This month, the London fashion label House of Holland introduced a function on its Twitter and Instagram feeds that allows users to simply reply "Buy".
It will apparently eventually be able to interact with third-party apps and services allowing users to simply say "OK, Google, order me an Uber" or similar, but they're not available yet.
The original Vogards revolutionized GMT watches by allowing users to simply flip a little lever to set a new timezone.
This allows users to simply pick the device up and use it as a gyroscopic pointing device.
After a long beta period, Nuance has also included a Dragon button on the Swype keyboard allowing users to simply talk to their phone.
