The situation of not having a free monitor at hand but urgently needing a second screen for work or system monitoring is familiar to many users. Modern smartphones have displays with resolutions that often exceed those of budget laptops, making them ideal candidates for this role. additional terminalUsing a wireless connection allows you to eliminate unnecessary wires and set up a mobile workstation in minutes.
Technology for transmitting video streams through Wi-Fi has become mature enough to provide acceptable latency for static tasks. You'll be able to display graphs, instant messaging chats, server control panels, or text editors on your smartphone's screen. The main advantage of this approach is complete independence from physical ports. HDMI or USB-C on the system unit.
In this article, we'll take a detailed look at software solutions that allow you to implement this feature without purchasing expensive hardware. We'll cover both universal utilities and specialized software for different operating systems. It's important to understand that image quality directly depends on your local network's bandwidth.
Operating principle and network requirements
The technology is based on video stream compression on the server computer and its instant transmission via TCP/IP protocols to the client device. The smartphone acts as a thin client, decoding the image. For stable operation, it is critical that both devices are on the same subnet and use the standard. IEEE 802.11ac or newer.
If your router supports dual-band mode, be sure to connect your PC and phone to the network. 5 GHzThe 2.4 GHz frequency is often overloaded by neighboring networks and household appliances, resulting in image artifacts and increased ping. The minimum recommended speed for comfortable work with text and graphics is 15-20 Mbps in the local segment.
⚠️ Warning: Using public Wi-Fi networks in cafes or airports to stream video is highly discouraged. Remote access protocols may be blocked by the network administrator, making your data vulnerable to interception.
Latency is always higher with a wireless connection than with a cable. Therefore, this method is unsuitable for dynamic tasks such as real-time video editing or first-person shooters. However, for system administration, reading documentation, or monitoring stock prices, a latency of 50-100 ms is practically unnoticeable.
Spacedesk: The Best Solution for Desktop Expansion
One of the most popular and free utilities for turning a smartphone into a second monitor is SpacedeskIt allows you to extend your Windows desktop to virtually any device with a screen, including tablets and phones running Android and iOS. The program works like a virtual display driver installed on your PC.
After installing the server component on your computer, the system treats the connected phone as a full-fledged physical monitor. You can change the resolution, screen orientation, and window layout using standard Windows tools. The driver settings allow you to select a compression codec, allowing you to optimize the stream for your network speed.
- 🚀 Multiplatform: Supports Windows 7/8/10/11 and Android/iOS mobile OS with no time limitation.
- 🎨 Flexible customization: Ability to adjust color depth and frame rate to reduce CPU load.
- 📶 Work on LAN: Connection is possible not only via Wi-Fi, but also via a USB cable (tethering mode), which reduces latency.
To get started, download the driver from the official website and install it on your PC. Install the app on your phone. Spacedesk from the store Google Play or App StoreAfter launching the app on your smartphone, it will automatically detect your computer on the network. Click on your PC's name, and after a few seconds, your phone's screen will light up, displaying the Windows desktop.
☑️ Pre-launch check for Spacedesk
Comparison of popular remote access applications
The software market offers a variety of alternatives, each with its own unique features. Some solutions are designed for low-latency gaming, while others are more suited for server administration. The choice depends on your specific needs and image quality requirements.
Below is a comparative table of the characteristics of the most relevant solutions for 2026. Data may vary depending on the software version and hardware configuration.
| Application | Connection type | Latency (ms) | Price | Peculiarities |
|---|---|---|---|---|
| Spacedesk | Wi-Fi / USB | 40-80 | For free | Virtual display, multi-touch support |
| Splashtop | Internet / LAN | 30-60 | Paid / Trial | High quality sound, low lag |
| TeamViewer | Internet | 100+ | Free (personal) | Remote control, file sharing |
| Chrome Remote | Internet | 80-150 | For free | Simplicity, integration with Google account |
Please note that paid versions of programs often offer improved encoding algorithms, such as H.265, which provide better text clarity at a lower bitrate. Free alternatives may use older codecs, which can result in blocky images on low-quality networks.
Why is refresh rate important?
The refresh rate (FPS) determines the smoothness of cursor movement. 24-30 FPS is sufficient for working with text, but 60 FPS is preferable for comfortable window navigation. Some apps limit FPS in the free version.
Setting up a connection via Splashtop and TeamViewer
If your goal is not to extend your desktop, but to have full remote control with the ability to transmit audio, you should pay attention to Splashtop or TeamViewerThese programs create a mirrored copy of your screen, allowing you to fully control your computer from your smartphone. Splashtop Personal is especially suitable for access within a home network (LAN), ensuring minimal latency.
To set up Splashtop, you need to register an account, install Streamer on your PC, and the app on your phone. Unlike Spacedesk, your phone doesn't become a second monitor, but displays what's happening on the main screen (or the selected monitor). This is convenient if you need to run a heavy application on your PC while relaxing on the couch with your smartphone.
TeamViewer and similar apps (like AnyDesk) are more often used for technical support or access from outside the home. They route the connection through their servers, allowing you to control a PC even if it doesn't have a public IP address. However, they're less suitable for using a phone as a permanent second screen inside an apartment due to potential image compression.
- 🔊 Sound transmission: Most of these applications can broadcast the computer's system sound to the phone's speaker.
- 🔒 Safety: Be sure to set a complex password for access and use two-factor authentication.
- 🖥️ Multi-monitor: Support switching between multiple physical PC monitors.
⚠️ Warning: When using the free versions of TeamViewer or AnyDesk for personal use, the system may falsely suspect commercial use and limit your session time. Be prepared for a countdown timer.
Using your phone as a system monitor (AIDA64)
A scenario where the smartphone is used not as a window display, but as a system resource monitoring panel, deserves special attention. A program bundle is ideal for this. AIDA64 on a PC and a proprietary app on your phone. This allows you to display graphs of CPU load, GPU temperature, and frame rate in games on your smartphone screen.
This method is especially popular among gamers and overclockers who need to monitor their hardware's temperature in real time without leaving the game. Configuration is performed through the menu. Preferences → Remote Sensor in AIDA64 on a computer.
You need to enable the option RemoteSensor and remember the IP address displayed in the program's status bar. On your phone, in the AIDA64 app, select Local Network connection and enter the computer's IP address. Once connected, a customizable dashboard will appear on the screen.
The advantage of this method is its minimal resource consumption. The phone receives only text data about sensor readings, not a video stream, so battery life is reduced and lag is completely eliminated. You can customize the display of any parameters available to the system.
Compatibility issues and solutions
Despite the simplicity of the technology, users may encounter a number of technical difficulties. Most often, problems are related to Windows Firewall settings, which by default blocks incoming connections from unknown applications. If your phone isn't detected by your computer, first check your network security settings.
You need to make sure your Windows network profile is set to "Private" and not "Public." A public profile hides your computer from other devices on the network. You should also check whether the app is allowed to pass through the firewall. To do this, type "private" in the Windows search. firewall and select "Allow interaction with the app".
Another common issue is different subnet masking or client isolation settings on the router. If the router is configured with a guest network, devices on it often can't see each other. Make sure both the PC and phone are connected to the main network.
- 🔌 Antiviruses: Third-party antivirus programs (Kaspersky, ESET, Norton) may have their own firewall, which must be configured separately.
- 📡 Roaming: Make sure your phone doesn't switch between 2.4GHz and 5GHz while it's running, as this may break the connection.
- 🔋 Energy saving: On Android, disable battery optimization for the client app, otherwise the screen may go dark.
Frequently Asked Questions (FAQ)
Can you use your phone as a monitor for gaming via Wi-Fi?
Technically, this is possible, but the experience will depend on input lag. For turn-based strategy games, card games, or simulators, it's perfectly acceptable. For shooters and fast-paced action games, even 50ms of lag can be critical. It's recommended to use a USB cable instead of Wi-Fi to reduce latency.
Does the phone drain a lot of battery in monitor mode?
Yes, the screen is the most power-hungry component of a smartphone. Constantly using it as a second display will drain the battery quickly. It's recommended to keep the phone connected to a charger or use wireless charging, if supported and not causing overheating.
Do you need internet access to use Spacedesk or TeamViewer?
Spacedesk doesn't require internet access in LAN mode; a router is sufficient. TeamViewer and the cloud-based versions of Splashtop require internet access, as the connection goes through the developers' servers. AIDA64 Remote also works locally, without access to an external network.
Why does the image on my phone look blurry?
This may be due to a low bitrate or resolution mismatch. Try lowering the resolution in your PC's driver settings or selecting a different compression codec. Also, check that "Data Saver" mode isn't enabled on your phone within the app.
Is it possible to transfer sound to a phone?
Audio Forwarding isn't supported by all applications. Spacedesk requires a paid version or a complex setup of virtual audio cables. Splashtop and TeamViewer transmit audio out of the box, but may have a significant delay between the audio stream and the video.