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It can be hard to find real bargains on the App Store these days, as so many services and utilities have moved to a freemium model with no up-front cost. But many of the best apps still come with a price tag, and we’ve found a few on offer this week. Don’t miss out!

All prices are accurate at the time of writing, but please be mindful that they could change at any time.

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Solar Walk 2

Was $3/£3, now $1/£1

One of the best ways to explore the solar system from the comfort of your sofa, Solar Walk 2 is a steal at just a buck. Maybe you’ve already got a stargazing app installed, but this is a different beast: a compendium of mind-boggling 3D models, panoramic photos, and more from outer space. Pair that with astronomy calendars, time travel, and an interactive encyclopaedia, this one really does make learning fun. If the recent Mars landing rekindled an interest in space, this is a fantastic resource.

Solar Walk 2

Calculator HD Pro

Was $10/£10, now $5/£5

True, a calculator’s not the most exciting download. But if the built-in Calculator app isn’t quite advanced enough for you, or you’re looking for a bit more customization, this is a colorful and clever alternative. Plus it works on iPad – something that Apple still, bizarrely, hasn’t enabled for its own effort.

Calculator HD Pro

Bridge Constructor Portal

Was $5/£5, now $3/£3

A rather unexpected mashup of existing franchises, this collab between Bridge Constructor and Portal delivers clever physics puzzles in droves. Its levels require both creativity and patience to conquer, but the presentation and wit keep it fresh throughout. Read our review first if you’re on the fence about this one.

Bridge Constructor Portal

xBlock

Was $50/£50, now $45/£45

This porn blocker keeps explicit content away when browsing the internet in Safari, meaning you and your family can browse safely without the risk of stumbling upon something a little raunchier than intended. Perfect for parents who want to keep their children from accessing inappropriate content on their devices, or to help those with a porn addiction kick the habit.

xBlock