OpenDrop vs AirDrop: Platforms, Range and Large Files Compared

The Platform Lock-In Problem

AirDrop is built into iPhone, iPad and Mac. It sends between those devices, and it also works with Quick Share on select Android phones when the iPhone is set to Everyone for 10 Minutes. There is no AirDrop for Windows or Linux.

If everything you own is from Apple, that's fine. Add a Windows PC or a Linux laptop and you're back to emailing files to yourself or uploading them to a cloud drive and downloading them again.

OpenDrop runs on Windows, Linux, iPhone, iPad and Android. macOS is coming soon. The mobile apps are on the App Store and Google Play, and the Windows app is also on the Microsoft Store. The desktop app includes a command line tool alongside the normal window.

What you can send depends on the plan:

• Free: phone to computer and computer to phone. Each phone pairs with one computer by scanning its QR code. No account.
• Pro: adds phone to phone (iPhone to Android included) and computer to computer. Every device signed in to your account connects automatically.

The full list is in the Free vs Pro table.

The "Same Room" Problem

AirDrop needs both devices nearby. It uses Bluetooth to find the other device and a direct Wi-Fi link between the two to move the file, so both radios have to be on. Neither device needs to be on a Wi-Fi network. On iOS 17.1 and later, a transfer that started nearby can finish over the internet if the devices move apart. You still can't start one from across town.

OpenDrop handles both cases.

Same Wi-Fi. After you pair with a QR code, your phone finds your computer on the local network and streams files directly at full speed. No chunking and no speed limit, even on Free.

Different networks. OpenDrop picks the route for you: a direct peer-to-peer link or its own encrypted relay. Your phone and computer both dial out, so it works behind NAT and firewalls with no port forwarding and nothing extra to install. You can send a file from your phone on cellular to the PC at home.

• Free tries peer-to-peer first, then the shared free relay. Remote transfers are speed-limited and share a weekly fair-use allowance.
• Pro starts on the faster Pro relay network, which has automatic backup, and keeps peer-to-peer as a fallback. No weekly limit.

AirDrop does win in one spot: no network at all. It only needs the two devices, not a router. OpenDrop's answer there is Bluetooth Low Energy, and only between two phones signed in to the same Pro account. Computers always connect over Wi-Fi or the internet.

The Large File Problem

Apple doesn't publish a file size limit for AirDrop. Nearby transfers go over a direct Wi-Fi link between the two devices, so large files generally go through as long as the receiving device has room.

OpenDrop has no file size cap on either plan, local or remote. How the file moves depends on the route:

• Same Wi-Fi: the file streams from sender to receiver directly. Nothing is stored in between.
• Remote on Free: the file moves in resumable 5 MB pieces. If the connection drops, the transfer picks up at the last finished piece instead of starting over.
• Remote on Pro: the whole file streams over the Pro relay. A dropped connection also picks up where it left off.

On a shaky connection, resume matters more than raw speed. A big upload from a phone on cellular can lose signal partway through, and restarting from zero each time is what makes large remote transfers painful.

Remote uploads from your phone keep going in the background on iPhone, and for a while on Android. Wi-Fi and peer-to-peer transfers, and all downloads to the phone, need the app open.

The Discovery and Pairing Problem

AirDrop decides who can see you with a setting. With Contacts Only, the sender has to be in your contacts. Since iOS 16.2, Everyone has become Everyone for 10 Minutes and switches itself back off, so strangers can't keep sending you files in public.

When AirDrop can't see a device sitting right next to it, the usual fix is to toggle Wi-Fi and Bluetooth or change the receive setting, then try again.

OpenDrop doesn't use contacts or a visibility setting. You pair a phone with a computer by scanning the QR code the desktop app shows. The code holds a private pairing key and the addresses your phone needs to reach your computer, plus a certificate fingerprint so the phone can check it is really your PC. Anyone who scans it can pair with your PC, so don't share screenshots of it. QR code pairing has more on how this works.

On the same network, the paired phone finds the computer with mDNS (multicast DNS), the same protocol behind Apple's Bonjour. The desktop app announces itself on the local network and the phone listens for it. Most home networks allow this.

Some networks, often guest and office Wi-Fi, block multicast. If the phone can't reach the computer on the local network, OpenDrop moves on to its next route, a peer-to-peer link or the encrypted relay, the same way it would from another network.

With Pro you skip the QR code. Phones, tablets and computers signed in to the same account (Google, Apple, Microsoft or email) find each other automatically.

Speed, Security, and the Stuff That Matters Less

Speed. Neither Apple nor OpenDrop publishes speed benchmarks. AirDrop sends over a direct Wi-Fi link between the two devices. OpenDrop on the same network sends over your existing Wi-Fi through your router, so your router and devices set the speed. Away from home, Free remote transfers are speed-limited and Pro uses the faster Pro relay.

Security. Both encrypt transfers, in different ways.

• AirDrop sets up a TLS connection between the two devices and uses iCloud identity certificates to confirm who is sending in Contacts Only mode.
• OpenDrop encrypts file contents with ChaCha20-Poly1305 (RFC 8439) on your device before they leave it, using a key derived (HKDF-SHA256) from the secret your devices share when you pair them. This applies on Wi-Fi, peer-to-peer, relay and Bluetooth transfers, and there is no plaintext fallback. Requests between your devices are authenticated with HMAC-SHA256 using the same secret.

Two OpenDrop details worth knowing. Relay servers carry file contents only in encrypted form, but they can see transfer details such as file names, file sizes and device names, which they need to route transfers. And the secret works differently by plan: on Free it is made on your computer and reaches your phone through the QR code; on Pro, OpenDrop's account service also stores it so new devices can join your account. The wireless transfer security guide goes into more detail.

The two tools are built for different jobs. AirDrop's identity check helps when files come from people around you. OpenDrop is for moving files between your own devices, where you control both ends.

If all your devices are Apple and they're in the same room, AirDrop needs no setup and works well. If you also have a Windows PC or a Linux machine, or you need to send files between your phone and computer when you're away from home, OpenDrop covers those cases (iPhone to Android and computer to computer need Pro). You can use both: AirDrop between Apple devices nearby, OpenDrop for your Windows and Linux computers and Android phones.