It has been over ten years since Android was first outed by Google, and back then it was hard to imagine the sheer number of apps we'd have today.

There are apps for everything, and many of them are completely free, meaning you're just a few downloads away from supercharging your smartphone at no extra cost.

Admittedly, the huge quantity of apps doesn't mean they're all quality - far from it in fact, and finding the good ones can be tough.

There are tools and techniques to help, with various lists in the Play Store providing you with Editor's Picks across a range of categories, new releases and even apps that are specifically recommended for you based on your previous installs.

You can also hunt out apps that are similar to your favorites by searching for an app you have and seeing what else comes up.

And checking out user reviews and ratings can save you from downloading a dud of an app.

But even with all that, the sheer number of apps on Google Play means many of the best can often get lost, while weaker ones sometimes rise to the top.

So to make sure you never install a duff app here's our selection of the best you should install right now - each one carefully chosen to ensure you'll have a whole suite of fun, engaging and, dammit, useful apps on your phone or tablet.

We've sorted them into categories so you can more easily find what you're looking for. But make sure to check back weekly for our free Android apps of the week, which you'll find below.

Best free Android apps of the week
Each week we add two apps to this list and you'll find these two latest additions below.

St John Ambulance First Aid
The St John Ambulance First Aid app isn’t new, but it is worth highlighting as it could save a life. It includes a selection of situations that you can choose from, such as ‘chest pain’ and ‘choking’, then talks you step by step through what you should do to help a person with these issues.

There are also guides to useful techniques that you might need, such as CPR, and the app – while functional rather than stylish – is easy to navigate.

Whether you ultimately choose St John Ambulance First Aid or not, we’d strongly recommend having at least one first aid app on your device - and this is one of the best.

Sound Amplifier
Sound Amplifier is an app from Google designed to enhance audio when using headphones. Well, we say an app, but it won’t appear in your app drawer and you can’t launch it as such. Instead, you’ll find it in the Accessibility section of your phone’s main settings screen, and only when wired headphones are connected.

Once there, you can reduce unwanted sounds, adjust the mic volume and boost or fine tune the audio from one or both sides of your headphones.

The primary purposes of the app are to make sound clearer by increasing quiet sounds without over-boosting loud sounds, and to reduce background noise so you can better focus on the audio.

It did a fairly good job in our tests, but there’s one major issue, namely the need for wired headphones. This of course is a problem for anyone who prefers to go wireless, and even more of a problem on the ever-growing number of phones that lack a 3.5mm headphone port.

The app also seems as though it could really benefit those with hearing issues, yet many such people use wireless hearing aids, which won’t be compatible with it. Hopefully Google will drop the need for wires before too long.

Our favorite free Android apps for painting, drawing, sketching, design and animation.

Over
Over could be the app to take your social media game to the next level, as it has all the tools you need to create stylish designs full of photos, images and text, fit for Instagram, Facebook and most other social sites or even for use on posters and flyers.

The app lets you select from a range of canvas sizes, many of which exactly line up with the sizes used by popular social sites, then lets you add images and text to them, with various options available, including a range of fonts, the ability to adjust colors and positioning, and more.

Over also includes plenty of pre-made graphics to spice up your projects, and when you’re done creating you can easily share your design to other apps or save it as a JPG or PNG.

The basic tools are mostly free, but power users might want to pay for the Pro subscription, as this gives you access to more of everything: more fonts, more graphics, plus a database of templates, so you don’t have to build up your designs from scratch.

Houzz
Redecorating or improving your home can be a daunting prospect, but Houzz could make it a little bit more manageable.

It could do that by inspiring you through its library of millions of photos, showing exteriors and interiors of various styles.

It could also do that by giving you a single storefront to find and buy all the furniture and other items you need, even going so far as to let you see products in your home, using augmented reality.

And it can do that by helping you find experts – such as architects and builders – to do the hard work for you.

If you’re planning to take on the task yourself then there are also plenty of articles on hand to help, as well as the ability to ask the Houzz community for advice.

Sticker Maker
If you use WhatsApp, you’re probably aware that the service has finally added support for stickers, so as well as emojis and GIFs you can now send larger emoji-like images. But while there are plenty of sticker packs to choose from there’s also – thanks to Sticker Maker – the option to make your own.

The app first has you create a new ‘sticker pack’ which you can name, then simply load up an image on your phone and cut out the part of the image that you want to use as a sticker. You can do this freehand or use tools in the app to cut a perfect square or circle.

You can also rotate the image if you want and then save it to your pack when you’re happy. Packs can contain up to 30 stickers, but need at least three. Once you’ve made at least three you’ll be able to send the pack to WhatsApp, where you can use your custom stickers just like any others.

If you later want to add or remove stickers from the pack, you can do that. You can also make additional packs if you have more than 30 sticker ideas or just want to keep the packs themed.

Sticker Maker is a slick app, and a useful one for anyone who likes WhatsApp stickers but just wishes they were more personalized.

Pexels
Pexels is a database of photos that you can use for free for any purpose, including commercial uses, with no attribution needed (though it notes that attributions are still appreciated).

You can search using keywords or browse trending images, while tapping the photographer behind a photo will show you their other work on Pexels and let you follow them, so you never miss anything new that they upload.

You can also ‘like’ and collect photos within Pexels and if you want to take them outside the app you can easily share them with Instagram or other apps, save them as your wallpaper, or simply download them.

But Pexels also lets you become one of the photographers, as you can upload any of your own photos to the app for other people to use. However you choose to use Pexels though, it’s a slick, beautiful app.

SketchBook
SketchBook isn’t a new app, but while many of the features used to cost money, it’s now completely free, making it worth revisiting.

The features that are now free include more than 130 brush presets, customizable canvas sizes, various rulers, high quality image imports and more.

And that’s on top of all the basic tools that were already free, such as a layer editor and pen mode, all of which combine to make this one of the most generous free sketching apps available on Android.

Coming from Autodesk, the power of SketchBook should come as no surprise, but it’s an app that seemed worth the money previously and is now utterly essential if you’ve even toyed with the idea of digital sketching.

DIY Projects
WikiDIY is a website that’s packed full of DIY projects, with guides for everything from making unicorn cupcakes to making a willow whistle. But it’s not all about making things, as WikiDIY also has guides for things like how to clean rubber on shoes or how to take good photos at night.

All of these guides can now be found in its new DIY Projects app, and they come with step by step instructions, diagrams, and in some cases videos. The guides also have questions and answers supplied by readers, along with lists of what you’ll need and any warnings that it’s worth being aware of before you start.

You can search for specific guides, browse by category, and bookmark your favorites. And while the app itself isn’t the best we’ve seen (it often feels like little more than a web wrapper) it’s hard to argue with the quality and quantity of the content.

Bitmoji
Ever wanted your own custom emoji and stickers that star you, rather than a generic face? Then you should definitely download Bitmoji.

This lets you recreate your likeness in cartoon form, with loads of tools available to make the look as perfect as possible. Then you can choose an outfit and get access to dozens if not hundreds of stickers, each of which feature you.

These can be shared to various chat and social apps, but Bitmoji has deeper integration with Gboard, letting you share its stickers direct from the keyboard. It can also be linked to your Snapchat account, making your Bitmoji your Snapchat avatar.

You can alter the look of your Bitmoji at any time, so if you change your own hairstyle you can change theirs to match, or just give them a new outfit, and new stickers and customization options are being added over time, so you shouldn’t get bored.

Canva
Canva was a hit on iOS and now it’s arrived on Android, giving you a simple yet powerful way to create posters, collages, flyers, cards, Instagram posts, banners and headers for blogs or other social media, and more.

It’s a graphic design app, and one that’s intuitive from the moment you launch it. Start by choosing the type of content you want to design, then take your pick from a wide selection of ready-made templates (or search for something specific). Once that’s done, you’re ready to get editing.

You can tap on any part of a template to change it with context-sensitive tools. Tap on text, for example, and you can write something new, or change the font, size, color and spacing.

Select an image to change the color, add a filter, adjust the brightness, contrast, saturation, or switch it for a different picture altogether – either one of the many in Canva or one from your gallery.

You can also drag and rotate things, and there’s unlimited undo, so you can go back as many steps as you want if you make a mess of the whole thing.

When you’re done, you can save your creation to your phone or share it online. It’s also saved in the ‘Your designs’ section of the app, which you can access from the web and other devices, so you’ll never lose a design you’ve made.

Curator
Curator claims to be the first gallery app that organizes your photos using AI entirely offline, giving you the search power of something like Google Photos, without compromising on your privacy.

It works well too. The first time you launch the app it will analyze and assign tags to all of your photos (which can take a long time), then if you search using a keyword, such as ‘beach’ or ‘cat’, it will show you every image containing that.

Curator has a nice interface too, with two themes and the ability to view albums, all images, or all of the tags that have been assigned.

Albums can be renamed and favorited, photos can be moved between albums and there are gesture controls, to help you navigate the interface faster. There are also new features on the way, such as private folders and shared albums.

If you don’t care about the added privacy offered by Curator, then Google Photos is still the better app. Not least because it backs up your images and gives you access to them from other devices, but Curator is a strong alternative for those who prefer to keep their online presence to a minimum.

Photo Map
Photo Map is simply a world map that displays your photos over the parts of the world that you took them in.

Zoom out and you’ll likely just see a single thumbnail of one of your images over each country that you’ve snapped shots in, but zoom further in and you will see photos grouped into much smaller areas too.

The thumbnails also have a number on them, telling you how many photos are in that gallery. You can easily see them all and enlarge them with a tap.

There are a few options, such as the ability to change the look of the map or add terrain or satellite imagery to it, but mostly it’s just a great and simple idea – a visual way of separating your photos based on where they were taken. This is definitely one for those who like to travel!

Photo Map is free to use, but a one-off $1.49/£1.29 IAP will get rid of adverts.

Picai
If you love slathering filters all over your photos then there’s a good chance you’ll love Picai, as it makes the process a lot smarter than most apps.

But this isn’t just a tool for sticking filters on photos you’ve already taken (though you can do that too). Rather, it’s a camera app. Simply point it at something you want to photograph and it will use AI to detect what you’re looking at, even going so far as to provide a text pop-up telling you what it sees.

From there it will automatically choose filters that it thinks would be a good fit and overlay two of them on the viewfinder – one on the left half, the other on the right. That means you can see what a filter will look like before you even take a photo.

If you’re happy with one, you can swipe horizontally across it to select it, or you can swipe up or down to cycle through filters. It’s a clever idea, well implemented and completely free.

Google Lens
Your phone might already have Google Lens built in, but if not you can now download it from the Play Store, and that’s worth doing.

Once you’ve launched the app you can point your camera at almost anything and get information on it. Point it at a book and it will give you links to reviews of the book and places to buy it. Other products also produce store links, or if Google Lens can’t definitively identify something it will suggest similar products.

You can also point it at a landmark to get information on it, at foreign text to translate it or at an event to add it to your calendar. You can even point it at plants or animals to identify them.

The results aren’t perfect. In our experience Google Lens will regularly incorrectly identify something or fail to come up with any suggestions for what something might be, especially with more unusual items, but it works often enough to be genuinely useful, especially once you get used to the kinds of things it’s likely to work with – so you know whether to even bother booting it up.

PhotoDirector
PhotoDirector is one of the more powerful and polished photo editing apps available on Android. It’s got you covered for fun filters, frames and effects, but it gives you more control than some of its peers. For example, you can adjust the strength of effects and choose to apply them globally or selectively.

You get a lot of control over the core image too, as you can adjust the white balance, saturation, hue, sharpness, tone and more.

You can also rotate, crop or mirror the image, cut out sections, adjust the perspective, and if you’ve taken a portrait remove red-eye. There’s more here, too much to list, but suffice it to say, PhotoDirector is a comprehensive app.

You’re not limited to just editing photos you’ve already taken either; there’s also a camera component, allowing you to take new shots and see how effects and filters will look before you’ve even taken a picture.

PhotoDirector is free to download and use. There’s an optional subscription for £2.59 (around US$3.70) per month if you want to unlock additional tools, remove adverts and improve the output quality, but the core app is already far more generous than most free offerings.

Just a Line
Just a Line is a simple example of the creative potential offered by AR (augmented reality). It lets you view the world through your phone camera and draw on scenes by touching the screen.

You can see your drawings from multiple angles as you move the phone around, and you can film your creations to save them or share them with others.

There’s not a whole lot more to it than that, and Google (which built the app) describes Just a Line as an experiment, so you should go in expecting a curiosity rather than a full-featured app, but it’s a fun introduction to AR that can be enjoyed by all ages.

LightX Photo Editor
There are loads of filter apps and photo fixers on Android, but LightX Photo Editor is one of a much smaller number of comprehensive editing apps.

It has plenty of filters, as well as tools for sharpening images and removing blemishes, and much more besides.

You can tweak the hue, saturation and tone, adjust the focus, add a frame, sticker or text, merge images, create collages, flip, crop and rotate, draw on pictures and change the perspective.

All of that is free, though there’s an optional IAP to remove adverts and add a few extra features.

Whether you opt for the free or paid version, LightX is a powerful, feature-packed app that should suit most mobile photo-editing needs.

Motion Stills
It’s not often that Google’s apps come to iOS before Android, but Motion Stills did, as it was designed to stabilize Live Photos, so they’d come out smoother. Now though it’s out on Android too, letting you shoot a short video clip which the app stabilizes.

Clips that you shoot can be saved as a video or a looping GIF and then shared on social media, and Motion Stills also lets you use a ‘Fast Forward’ mode, which will condense up to a minute of footage into a shorter clip. This too is stabilized, to keep it smooth, and you can pick the playback speed.

Motion Stills only works for new footage – so you can’t import and stabilize anything you’ve already shot (though if you just want to turn old footage into a GIF there are plenty of other apps that will do that).

But for anything new you shoot Motion Stills is a great way to make a GIF or short video and ensure footage remains smooth. It’s fast too, as footage is stabilized in real time, so you don’t need to wait for it to process your clip, and it’s completely free.

Google Photos
There are probably hundreds of photo apps around, but Google Photos stands out as it gives you unlimited storage for photos and videos, all for free.

That's reason enough to jump on board, especially as it works not just on Android but on iOS and computers too.

But with basic editing tools and the ability to make collages and albums this is more than just photo and video storage, it aims to be your first and last stop after taking a picture. To achieve that it will need a few more features, but it's well on its way.