Redditors are providing an online public service by recommending extremely helpful iOS apps that are absolutely free. There are adventure apps, sleep apps, education apps, sleep apps, mental health apps, food apps, sleeeep apppppps. Yeah, you get the point.

Check out our compilation of the best free iPhone apps that Redditors love. And if you want to learn more about getting the best out of your tech, sign up for Mashable's Top Stories and Deals newsletters today.

1. AllTrails

AllTrails is a handy guide for adventurers looking for running, hiking, and biking trails. It offers details about the trails — more than 100,000 all over the world! — including difficulty level, elevation, and length, according to Redditor Wookiepuke. App users can also post pictures of trails and leave comments and reviews for other users. And, yes, it tells you if the trails are dog or kid-friendly, too.

2. Khan Academy

Khan Academy is a nonprofit organization that provides free online educational tools to help students learn. Being a “student” doesn’t mean you have to be in school, however. In this case, being a student just means you have something you’d like to learn more about. The app, suggested by Redditor Colgate_and_OJ, has information and learning tools on a variety of subjects, from art history to astronomy, at multiple learning levels.

3. Mealime

Mealime is a recipe app that, as Redditor theblartist states in their post, lets the user enter information about their tastes and diet goals before recommending recipes that correspond to said information. Thanks to its ability to streamline recipes to a user’s preferences, the app should save plenty of time on deciding what to eat.

4. Tunity

How many times have you been trying to watch something on TV but the sound is either muted, or background noise makes it impossible to hear? Tunity allows users to simply scan the TV screen, and the app streams the TV audio straight to your device so you can listen with headphones. Redditor mike-mag addsthat it’s ideal in loud, crowded bars where maybe instead of chatting it up with the guy next to you who won’t stop talking, you’re actually trying to watch the game.

5. Libby

Libby, recommended by Redditor awkwardlyonfire, essentially functions as an e-library. As long as you have a library card, you can access and borrow your library’s collection of ebooks and audio books for free. The app allows you to link your library card and then browse your local library's collection. Simply download a book if you want to read it. All of your "loans" are automatically returned on their due dates. No late fees! It’s the library without having to actually get up and go there. Perfect for global-pandemic-like conditions.

6. AirDroid

It’s file sharing made easy with AirDroid, which allows users to “share photos, videos, audios, or any files with your friends and across screens."

Let's say you want to share photos from your phone to your computer. As long as the devices are on same Wi-Fi network, your AirDroid account on your computer should be able to recognize the account on your phone. From there, your computer will recognize your phone's photos/videos, and you can pick and choose which files to transfer. No USBs necessary, no wires, and no data cost. You can check out more specifics on the app here. Suggested by Redditor RODjij

7. Insight Timer

For meditators everywhere, Insight Timer provides guided meditations at various lengths instructed by “the world's top meditation and mindfulness experts, neuroscientists, psychologists, and teachers from Stanford, Harvard, the University of Oxford, and more,” according to the app description. The Redditor’s postremains online with almost 400 points, although their account seems to have been deleted. We thank them, nonetheless.

8. Clue Period & Cycle Tracker

Clue allows users to track their menstrual cycles and log information about their symptoms to learn more about their menstrual health. Clue also uses that information to make predictions about the user’s period cycle — when it will hit, along with likely symptoms and their severity. Redditor annabearused Clue to plan their Valentine’s weekend vacation so they wouldn’t be on their period while they were away. According to their post, it worked like a charm.

In 2022, you'll want to take a moment to learn about the data collected by period tracking apps and how it could be used in a post-Roe world.

9. Shazam

Shazam is pretty popular and has been for some time now, but it’s always worth a mention when we’re talking about useful free apps. Shazam users can open the app while a song is playing on the radio, in a store, or pretty much anywhere, and Shazam will provide the name of the song as well as the artist who sings it. It’s essentially the answer to the age-old question: “The hell is the name of this song playing?” Thanks to Redditor DunkyChameleonfor the assist.

10. Photomath

Listen, math is really freaking hard, okay? Sometimes you’ll be stuck on a single problem for an hour with no idea what to do. Photomath is a study tool that allows the user to take a picture of that problem. The app will scan it, and the problem then gets put into the app's algorithm, which provides step-by-step instructions on how to solve it. And, boy, would I love to have known this existed before today. Suggested by Redditor Mattiusdagrub8.

11. DuoLingo

Another handy educational app, DuoLingo offers free quick lessons to help users learn new languages. Choose from more than 35 languages, from Spanish to Japanese, to learn. You'll get an array of mini games and small lessons to further your vocabulary and understanding. Suggested by Redditor icollectcorpses, th – *pauses, suspiciously squints at username*... The app gives you the space to learn a new language without the added pressure of grades and the dreaded threat of failure!

12. SkyView Lite

Listen up, aspiring astronomers and those even vaguely interested in stars and planets and stuff. Redditor eviliveis making us aware of SkyView Lite, a stargazing app that allows you to simply point your phone at the sky and have it tell you what’s up there. It’ll show you individual stars, constellations, planets, and even satellites! It's more than the Big Dipper up there, and now you know it.

13. Waze

Redditor Cazmae’s recommendationis short and sweet, but a worthy inclusion nevertheless. If you haven't heard of it already, Waze is a navigation app that calculates routes, gives directions, and encourages its users to report accidents and obstacles so as to enhance everyone’s experience.

14. iNaturalist

iNaturalist, recommended by Redditor mmmmwhu, lets users take pictures of plants and animals, providing suggestions as to what species they are by using “visually similar suggestions and verification by dedicated contributors,” according to the app description.

15. Radio Garden Live

Rotate the globe, tap a location, and get access to radio stations in that area? Sounds easy enough. Radio Garden gives users the chance to listen to different radio stations around the world. Thanks, Redditor karlotomic!

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16. Too Good To Go

As Redditor JohnTheBaptiste1 points out, Too Good To Go is potentially a great money saver while doing a bit of social good, as well. The app allows participating restaurants and stores to sell food (that would otherwise go to waste) at a cheap price for users to purchase. The app allows you to find participating stores/restaurants in your area and place orders for pickup.

17. Google Arts & Culture

Like a virtual museum, Google Arts & Culture “puts the treasures, stories and knowledge of over 2,000 cultural institutions from 80 countries at your fingertips,” the app description says. Redditor yokayla highlightsits value for art/history buffs, as it gives users access to exhibits and information they’d otherwise have to spend a lot of money (and perhaps travel great distances) to get in person. Google and its partners team up with cultural institutions to help them "digitize, manage and publish their collections online, all for free." (You can also find out which famous artwork you most resemble.)

18. A Soft Murmur

Just what you need: A background noise app that lets you combine different sounds and control the volume of each. Thunder, rain, wind, and more are at your disposal to use for whatever reason. Some like background noise for studying. Some like it for working. We’d probably use it the same way Redditor Jay_Diddlydoes: sleep.

19. Sleep Cycle - Sleep Tracker

Speaking of sleep, Sleep Cycle gives its users insight into their sleeping patterns. It learns your sleep cycle, detects snoring and other sounds, and uses its “smart” alarm clock to wake you when your body is in its lightest sleep stage. Using your body’s natural circadian rhythm to, as Redditor Happypepik says, make mornings easier? We’re down for sure.

20. Alarmy

If Sleep Cycle is the friend who tells you what you want to hear, Alarmy is the friend who tells you what you need to hear, even if it royally pisses you off. As nice as waking up naturally from a period of light sleep is, that style just doesn’t cut it for some of us. Alarmy gets you out of bed with loud noises and “missions” that make you get up and do something to turn the alarm off. Thank you for the lovely suggestion, Redditor Dahhhkness... we guess.

21. Apollo for Reddit

If you're looking for an alternative to the official Reddit app, try Apollo for Reddit. With nearly 150,000 reviews and a score of 4.8 out of 5 in the App Store, this free app creates a more customized Reddit experience for casual and power users alike. Redditor Akashiarys described it as a "game changer."

22. Finch

Do you like the idea of taking care of a pet bird but don't have the emotional energy to commit to cleaning out a bird cage? Finch might be just the free iPhone app you need. Part self care, part virtual companionship (and plenty of cute bird illustrations), the app has been commended by Reddit users for helping to deal with anxiety. The app uses personalized self-care exercises to help you take care of your bird and yourself.

23. Apple Maps

Stay with us. You might think of Apple Maps as the far worse version of Google Maps or Waze, but according to several Redditors it has gotten way better over the years. "There’s a stigma from like 8 years ago that Apple Maps is still terrible. But it’s honestly the most pin-point accurate map app (for me, at least). They’ve added every main feature you could possibly want by now," said Redditor Awsaim. "Apple maps has reached the point where it's just as good, if not better, than google maps. It also looks a lot cleaner than google maps imo," echoed Redditor TP_blitz. In fact, Apple Maps popped up several times in a post about the best designed iOS apps in r/iPhone. That's pretty convincing stuff from a community that know its iOS apps.

This story was originally published in 2020 and updated in 2022.