An old Fire tablet sitting in a drawer is a 1280x800 (or better) panel with Wi-Fi, a battery, and a USB port. That is a working second display waiting for the right desktop app. The best apps for turning an Amazon Fire tablet into a second monitor do the heavy lifting on the PC or Mac, treating the tablet as a dumb viewer over Wi-Fi or USB. We rebuilt the setup on a 2019 Fire HD 10 and a first-gen Fire 7 against seven desktop-side tools, checked what each one costs today, what OSes it hosts on, and whether the tablet needs the Amazon Appstore or an APK sideload. This list is for anyone with a spare Fire tablet who wants a second screen for Slack, chat, docs, or reference material next to a Windows, macOS, or Linux desktop.
What to look for in a second-monitor app for a Fire tablet
Fire OS is a forked Android without Google Play, so the desktop-side app decides most of the experience. A few things matter more than marketing copy.
- Desktop OS coverage. Some hosts are Windows only. If a Mac or Linux box drives your desk, half the list is out.
- Wired versus wireless. USB is steadier and lower latency, but wired mode on Android usually means enabling Developer Options and ADB on the tablet.
- Extend versus mirror. A true extended desktop appears as a second display in Windows Display settings; a mirror just duplicates the primary screen.
- How the tablet gets the client. Only Spacedesk sits in the Amazon Appstore. Everything else asks for an APK sideload, which means turning on “Apps from Unknown Sources” in Fire OS settings.
- Price and licensing. Free for personal use, one-time paid, and subscription all show up in this space. Older Fire hardware also caps how fast the codec can run, so paying for 60 fps you can never see is money wasted.
- Touch and pen input. If you want the Fire as a control surface for Photoshop palettes or DAW controls, the desktop host has to pass touch back.
Quick comparison
| App | Best for | Desktop host | Connection | Price | Fire tablet install |
|---|---|---|---|---|---|
| Spacedesk | Free wireless pick that just works | Windows 10/11 | Wi-Fi, USB tether | Free (personal) | Amazon Appstore |
| Deskreen | Open source, any desktop OS | Windows, macOS, Linux | Wi-Fi (Silk browser) | Free (GPL v3) | Silk browser, no install |
| Superdisplay | Low-latency USB on Windows | Windows 10/11 | USB, Wi-Fi | Paid, around $19.99 | APK sideload |
| Splashtop Wired XDisplay | Free wired option for Mac and PC | Windows, macOS | USB | Free viewer, paid HD | APK sideload |
| iDisplay | Cross-platform veteran with touch | Windows, macOS | USB, Wi-Fi | Paid, around $17.99 | APK sideload |
| Duet Display | Best paid pick for macOS users | Windows, macOS | USB, Wi-Fi, AirPlay | Subscription from about $24.99/yr | APK sideload |
| Twomon SE | USB-only, no fluff | Windows 10/11 | USB | Paid, around $9.99 | APK sideload |
The apps
1. Spacedesk, best overall free pick for Windows
Spacedesk is the app most Fire-tablet write-ups land on, and after a few evenings of testing it is easy to see why. The Windows driver installs as a virtual WDDM display adapter, so Windows treats the Fire as a real second monitor in Display settings, complete with resolution and orientation controls. On the tablet side, Spacedesk is one of the few second-monitor apps actually listed in the Amazon Appstore under “spacedesk Display Screen Cast”, which means no sideloading and no Developer Options on Fire OS. Wireless mode runs over the LAN and USB tether works if both devices share the same subnet.
Where it falls short: The desktop host is Windows only. macOS and Linux users have to look elsewhere. Wireless latency on older Fire hardware runs around 60 to 120 ms, fine for docs and chat, distracting for video.
Pricing:
- Free: Full feature set for non-commercial use.
- Paid: Commercial licenses through the developer’s site, priced per seat.
Platforms: Windows 10, Windows 11 host. Fire OS, Android, iOS, and HTML5 viewer.
Download: Spacedesk driver (Windows) - Spacedesk viewer on Amazon Appstore
Bottom line: If your desktop is Windows and you have not tried Spacedesk yet, start here. It is free, ships through the Amazon Appstore, and works wirelessly out of the box.
2. Deskreen, best free option for macOS and Linux
Deskreen flips the model. Instead of installing an app on the tablet, the desktop host serves a web page and the Fire tablet just points its Silk browser at the address. Because it uses WebRTC over the LAN, the tablet needs zero software beyond the browser it already ships with, which is the cleanest way onto a locked-down Fire 7 or Fire HD 8 that never met the Amazon Appstore. Deskreen is GPL v3 open source (over 20k stars on GitHub) and runs on Windows, macOS, and Linux, which no other app on this list covers.
Where it falls short: Deskreen mirrors, it does not extend. Turning it into a true second display needs a virtual display driver on the host, and on macOS 14 and later that means BetterDisplay or a similar helper. Silk browser also throttles background tabs, so the tablet needs to stay awake.
Pricing:
- Free: Full app, no feature caps, no subscription.
- Paid: Optional donation via Open Collective.
Platforms: Windows, macOS, Linux host. Any device with a modern browser on the viewer side.
Download: Deskreen (all platforms) - Deskreen on GitHub
Bottom line: The obvious pick for a Mac or Linux desktop, and the fastest setup on a Fire tablet with no Appstore access.
3. Superdisplay, lowest-latency wired pick for Windows
Superdisplay is what to reach for when Spacedesk is not fast enough. The Windows host uses a hardware-accelerated USB pipe, and on a Fire HD 10 tethered by cable we measured display latency around 20 to 30 ms, which is close to unnoticeable for scrolling and cursor movement. Wi-Fi mode is available too, but USB is where it earns the price tag. The app also passes stylus pressure through, so if you have paired a cheap capacitive pen, Superdisplay for a second monitor doubles as a rough drawing surface.
Where it falls short: Windows only. The Fire tablet needs an APK sideload and Developer Options with USB debugging turned on, which is more setup than most casual users want.
Pricing:
- Free: 10-minute trial per session, unlimited sessions.
- Paid: One-time purchase around $19.99 on the Play Store; check the developer’s site for current pricing.
Platforms: Windows 10, Windows 11 host. Android 6.0+ client (Fire OS 6+ works after sideload).
Download: Superdisplay (Windows driver + APK)
Bottom line: Get this if you want Spacedesk’s ease with better latency and you already have USB debugging enabled.
4. Splashtop Wired XDisplay, best free wired option across Windows and macOS
Splashtop Wired XDisplay is the wired sibling of Splashtop’s remote-access line. The XDisplay Agent runs on Windows or macOS, the tablet plugs in over USB, and the desktop treats it as an extended display up to 1080p at 60 Hz on capable hardware. On a Fire HD 10, the practical ceiling is closer to the tablet’s native panel resolution, but performance is smoother than Wi-Fi mirrors because USB rules out network jitter. The free viewer covers most day-to-day work.
Where it falls short: Splashtop dropped the free Android/Fire viewer on Google Play a few years back, so grabbing the APK from a trusted mirror is the easiest path onto Fire OS. Setup also demands ADB drivers on Windows and, on Apple Silicon Macs, a couple of extra permission grants for the XDisplay Agent.
Pricing:
- Free: XDisplay Agent for Windows and macOS, plus the standard-quality viewer.
- Paid: XDisplay HD viewer for higher-quality streaming, priced around $9.99 to $19.99 on iOS; free tier is enough for most Fire tablet use.
Platforms: Windows, macOS host. Android and iOS clients.
Download: Splashtop XDisplay Agent (Windows and macOS)
Bottom line: The go-to free wired pick when Deskreen’s browser-based mirror is not enough and Spacedesk’s Windows lock rules it out.
5. iDisplay, cross-platform veteran with pen and touch
iDisplay has been shipping since 2010 and it still has one of the widest OS matrices in the category. The desktop host is free on Windows and macOS, and the Android app (which installs cleanly on Fire OS after sideload) supports both USB and Wi-Fi. Touch input passes through to Windows and macOS, so you can use the Fire tablet as a floating palette for Photoshop, Lightroom, or a DAW’s mixer view. iDisplay for a second monitor is one of the few options here that keeps a straight cross-platform stance without a subscription.
Where it falls short: UI has aged. Wi-Fi mode occasionally drops on 5 GHz networks with band-steering routers, and the paid Android tier is not cheap for what it does.
Pricing:
- Free: Windows and macOS desktop host from the developer’s site.
- Paid: Android app around $17.99, one-time purchase.
Platforms: Windows, macOS host. Android, iOS clients.
Download: iDisplay desktop host
Bottom line: A safe pick if the desk mixes Windows and macOS and you want touch input, and can stomach a paid Android app.
6. Duet Display, best paid pick if the primary desktop is a Mac
Duet Display is built by ex-Apple engineers and it shows. The macOS host is polished, wired mode over USB-C or Lightning is genuinely low-latency, and Duet Air adds Wi-Fi and AirPlay for wireless use. Android support (which covers Fire OS after an APK sideload) landed a few years back and now runs on the same feature track as the iPad client. On a modern Fire HD 10, Duet Display for a second monitor holds up at close to 60 fps over USB when the tablet supports USB accessory mode.
Where it falls short: The pricing shifted to subscription-only, which stings for a tablet you paid $50 for. Older Fire hardware, especially anything on Fire OS 5, may not negotiate USB display class at all.
Pricing:
- Free: 7-day trial of the desktop host.
- Paid: Duet Air subscription around $24.99 per year, Duet Pro tier at around $34.99 per year.
Platforms: Windows, macOS host. Android, iOS, ChromeOS clients.
Download: Duet Display (Windows and macOS host)
Bottom line: Worth the subscription for a Mac-first workflow where the Fire tablet is the daily secondary. Skip it if you are on Windows and Superdisplay already works.
7. Twomon SE, the no-frills USB pick
Twomon SE is the successor to the older Twomon USB and it aims at exactly one thing: plug in an Android tablet over USB and get a second display on Windows. There is no wireless mode, no touch input, no extras. That trimmed scope is why it stays cheap and why setup is short: install the Windows driver, install the ADB helper, connect the cable, and Windows adds a second display. On a Fire HD 10 in accessory mode, we saw stable output around the panel’s native resolution.
Where it falls short: No macOS host, no wireless, no touch. And like every other paid option here, the app is not in the Amazon Appstore, so the tablet needs the APK.
Pricing:
- Free: No free tier beyond a short trial in the Play Store listing.
- Paid: One-time purchase around $9.99 in the Play Store.
Platforms: Windows 10, Windows 11 host. Android 6.0+ client.
Download: Twomon SE (Play Store listing)
Bottom line: Cheapest paid option that actually feels good over USB on Windows, if you can accept the sideload step.
How to pick the right one
The desktop OS decides most of this before anything else does.
- If you are on Windows and want the least friction: Spacedesk. Free, in the Amazon Appstore, works over Wi-Fi.
- If you are on macOS or Linux: Deskreen. It is the only pick that hosts on both and the Fire tablet needs nothing beyond the Silk browser.
- If Wi-Fi latency bothers you on Windows: Superdisplay over USB.
- If you want a free wired option on a Mac: Splashtop Wired XDisplay. It also covers Windows if you prefer one app across both desks.
- If you need touch input for creative apps: iDisplay, because it passes touch on both Windows and macOS.
- If the primary machine is a Mac and Duet’s subscription does not scare you: Duet Display. Wired mode is the best-feeling paid experience on Apple Silicon.
- If you already sideload apps and want the cheapest one-time buy: Twomon SE.
If a Fire tablet on Fire OS 5 or earlier refuses to work with any wired option, that is usually a USB accessory-mode limitation on the hardware, not the app. Deskreen bypasses the problem because it only needs a browser.
FAQ
Can you use an Amazon Fire tablet as a second monitor?
Yes. Fire OS is a fork of Android, so most second-monitor apps built for Android tablets install on a Fire tablet after enabling “Apps from Unknown Sources” and sideloading the APK. Spacedesk is the exception: it is available directly on the Amazon Appstore, so no sideload is needed. The desktop-side driver does the work; the tablet just displays what the PC sends.
What is the best free app to turn a Fire tablet into a second monitor?
Spacedesk on Windows and Deskreen on Windows, macOS, or Linux. Spacedesk is easier to set up on Fire hardware because it is in the Amazon Appstore, but it is Windows-only on the desktop side. Deskreen is open source, runs on all three desktop OSes, and needs nothing on the tablet beyond the Silk browser.
Do you need USB debugging on a Fire tablet to use it as a second monitor?
Only for wired USB modes. Spacedesk over Wi-Fi and Deskreen through the browser do not need Developer Options. Superdisplay, Splashtop Wired XDisplay, iDisplay in wired mode, Duet Display in wired mode, and Twomon SE all require Developer Options enabled and USB debugging turned on in Fire OS settings, plus the ADB driver on the desktop.
Will an old Fire 7 or Fire HD 8 work as a second monitor?
For Wi-Fi apps like Spacedesk and Deskreen, yes. The panel resolution caps what you get (1024x600 on the early Fire 7 is tight for real work), and older Fire OS 5 hardware can be quirky with modern APKs. Wired USB display apps often fail on Fire OS 5 because the tablet does not support USB accessory mode. Stick to wireless on anything older than a 2017 model.
Can a Fire tablet act as a touchscreen second monitor?
For touch input to reach the desktop, both the tablet app and the desktop host have to support pass-through. iDisplay, Duet Display, and Superdisplay do. Spacedesk supports touch in newer builds on Windows 11. Twomon SE and the free Splashtop Wired XDisplay do not pass touch on Android.
Is it worth paying for a second-monitor app when Spacedesk is free?
If Spacedesk works on your setup and you do not need macOS support, no. The paid apps earn their price in two scenarios: lower USB latency on Windows (Superdisplay), or a proper Mac host with wired mode (Duet Display). Owners of a Fire tablet with a working Amazon Appstore install should try Spacedesk first and only pay if it falls short.