Start by naming what you actually need to do
The first step is to stop thinking about "applications" as a category and start thinking about the specific task. Are you trying to send a message to one person or a group? Store files so you can reach them from different devices? Edit a photo before posting it? Create a document you'll print or share? Each task has different tools, and picking the wrong one wastes time and often creates security problems.
Write down the task in one sentence. Not "I need an app" — but "I need to video call my sister" or "I need to store my tax documents where my accountant can see them." This sentence is your filter for every choice that follows.
Key Takeaways
- Name your specific task first — messaging, file storage, video calls, document editing — before you look at any application.
- Check what devices you actually use and whether the application runs on all of them, because an application that only works on your phone is useless if you need it on your computer.
- Look at who owns the application and what they do with your data, because free applications often make money by selling information about how you use them.
- Start with applications you already have or that come built into your device, because they usually have fewer security gaps than downloading something new.
- Test an application with low-stakes information first — not your passwords or financial records — to see whether it actually does what you need.
Match the application to the devices you actually own
An application that only runs on iPhone is worthless if you use an Android phone and a Windows computer. Before you download anything, list the devices you need it to work on: phone, tablet, laptop, desktop, or some combination. Then check whether that specific application runs on all of them.
This matters because the same application name on iPhone and Android is often two completely different programs with different features and different security practices. Zoom on an iPhone works differently than Zoom on Android, which works differently than Zoom on a Windows computer. Check the official website or the app store for your device — not a review site — to confirm the application exists for each device you need.
Also ask whether you need the application on your phone at all, or whether a web browser version would work. Many applications — Google Docs, Canva, Figma — work just as well in a browser as they do in a downloaded application, and a browser version means you do not have to install anything or give the application permission to access your phone's camera, location, or contacts.
Understand who owns the application and what they do with your data
Every application is owned by someone — a company, a nonprofit, a government agency, or an individual developer. That owner decides what happens to the information you put into the application. Some applications are free because you pay with money. Others are free because you pay with your data.
Look at the privacy policy — yes, actually read it, or at least the first section — to understand what the owner collects and what they do with it. Facebook collects what you post, what you click, where you are, and what you search for, and uses that information to sell ads. Signal collects almost nothing and does not sell ads. Google Photos stores your photos and uses them to train image-recognition software. Flickr stores your photos and does not use them for anything else. The application does the same job — storing photos — but the cost to you is completely different.
If an application is free and you do not see a privacy policy, or the privacy policy says the owner sells your data to third parties, that is a sign to look for something else. Free applications from established companies — Microsoft, Google, Apple — usually have clear privacy policies you can read. Free applications from unknown developers should raise a question: how are they paying for the servers?
Start with what you already have
Before you download a new application, check what came with your device or what you already have installed. Your phone probably came with a camera, a notes application, a calendar, and a messaging application. Your computer probably came with a web browser, a text editor, and a file manager. These built-in applications usually have fewer security problems than something you download, because the company that made your device has already tested them.
If you need to send a message, check whether your phone's built-in messaging application works. If you need to store a file, check whether your computer's file manager or a cloud storage application you already use — OneDrive, Google Drive, iCloud — will do the job. If you need to edit a photo, your phone probably came with a photo editor. You may not love these applications, but they work, they are secure, and you do not have to install anything new.
This is not a reason to never download anything. It is a reason to ask "do I already have something that does this?" before you search for a new application.
Check what permissions the application is asking for
When you download an application, it asks for permission to access things on your device: your camera, your location, your contacts, your photos, your microphone. These permissions exist for a reason — a video calling application needs your camera and microphone — but some applications ask for permissions they do not need.
A flashlight application does not need access to your location or your contacts. A note-taking application does not need access to your camera. If an application is asking for permissions that have nothing to do with what it does, that is a sign to look for something else. On iPhone, check the Privacy settings to see what permissions each application has. On Android, check the application's details page in the Google Play Store to see what permissions it requests.
This is not a perfect filter — some applications ask for permissions they do not use, and some legitimate applications ask for permissions that seem strange — but it is a useful question to ask before you install something.
Test with information that does not matter if something goes wrong
Before you put your passwords, financial information, or private photos into an application, test it with something low-stakes. Send yourself a test message. Upload a photo you do not care about. Create a document with fake information. See whether the application actually does what it promises, whether it is easy to use, and whether it crashes or behaves strangely.
This step catches two problems. First, you find out whether the application actually works the way the description says it does. Second, if something goes wrong — the application deletes your data, or sells it, or gets hacked — you have not lost anything important. You can then decide whether to trust it with real information, or whether to look for something else.
This is especially important for applications that handle sensitive information: password managers, banking applications, health tracking applications, messaging applications. Test them with fake data first. See how they work. Read reviews from people who have used them for months, not just people who downloaded them yesterday. Then decide whether you trust them with the real thing.
Know the difference between web, desktop, and mobile applications
A web application runs in your browser — Chrome, Safari, Firefox, Edge. You go to a website, and the application runs there. Examples: Gmail, Google Docs, Canva, Figma. Advantages: you do not have to install anything, it works on any device with a browser, and updates happen automatically. Disadvantages: you need an internet connection, and the application can only access what your browser allows.
A desktop application runs on your computer — Windows, Mac, or Linux. You download it, install it, and it runs on your hard drive. Examples: Microsoft Word, Adobe Photoshop, Slack, Discord. Advantages: it works without the internet (usually), it can access more of your computer's power, and you have more control over when it updates. Disadvantages: you have to install it, you have to update it manually, and it only works on the operating system it was built for.
A mobile application runs on your phone or tablet — iPhone or Android. You download it from the App Store or Google Play, and it runs on your device. Examples: Instagram, TikTok, Spotify, Uber. Advantages: it is optimized for a small screen and touch, and it can access your phone's features like the camera and location. Disadvantages: you have to install it, it takes up storage space, and it can ask for permissions that feel invasive.
For most everyday tasks, a web application is the safest choice because you do not have to install anything and updates happen automatically. But if you need to work without the internet, or if you need the application to do something a browser cannot do, a desktop or mobile application is necessary.
Frequently Asked Questions
Is it safe to download applications from the App Store or Google Play?
Both stores review applications before they appear, but that review is not perfect. Applications can still have security problems or ask for permissions they do not need. Read the reviews and the permissions list before you download. If an application has a lot of one-star reviews saying it crashes or steals data, that is a sign to look for something else.
What should I do if an application asks for a permission that seems wrong?
Do not install it. If a flashlight application needs access to your contacts, or a note-taking application needs access to your location, that is a red flag. There are thousands of applications that do the same job — find one that does not ask for permissions it does not need.
Can I trust free applications, or should I always pay?
Free applications are not automatically dangerous, but you should understand how they make money. If they sell ads, they collect information about what you do. If they sell your data to third parties, that is a bigger problem. Some free applications from large companies — Google, Microsoft, Apple — are genuinely free and do not sell your data. Others are free because you are the product being sold.
How do I know if an application has been hacked or has a security problem?
Check the news and security websites like Ars Technica or Krebs on Security. If a popular application has a serious security problem, it will be reported. You can also check the application's support page or social media to see whether other people are reporting problems. If you see a lot of complaints about data loss or hacking, that is a sign to stop using it and switch to something else.
What is the difference between an application and a website?
A website is something you visit in a browser — you type in a web address and the page loads. An application is something you download and install on your device. Some applications run in a browser and look like websites. Some websites run like applications. The difference is usually about how much you have to install and how much the application can access on your device.