Synctrain vs AirQR

With Synctrain you can securely synchronize files with other devices that have Syncthing installed. You can choose to synchronize full folders, or choose specific files. With Synctrain you can also stream audio and video files from other devices. When you synchronize files, all changes, including deleting files, also happen on your other devices. Do not use Synctrain for back-up purposes, and always keep a back-up of your data. You decide with which devices you share which files. This also means the app makers cannot help you access or recover any lost files. This app is powered by Syncthing. This app is however not associated with or endorsed by Syncthing nor its developers. Please do not expect support from the Syncthing developers. Instead, contact the maker of this app if you have questions.

AirQR sends files between devices the simplest way possible: one screen shows an animated QR code, the other scans it. No Wi-Fi. No Bluetooth pairing. No hotspot. No account. No cloud, ever. HOW IT WORKS Pick a photo, video, file, URL, or text on the sender. An animated sequence of QR codes appears on screen. Open Scan on the receiving device and point it at the screen — a progress bar fills as frames arrive. When the last frame lands, the file is reassembled exactly as sent. WHAT YOU CAN SEND • Photos and videos from your library • Any file: PDFs, documents, ZIPs, spreadsheets • URLs and links • Typed text or clipboard content • Content from other apps via the Share Extension BUILT FOR ZERO INFRASTRUCTURE AirQR works exactly the same in airplane mode, underground, on a flight, or on an air-gapped network with no internet access at all — not even a shared Wi-Fi network or hotspot. Most "offline" transfer apps still need both devices on the same Wi-Fi Direct connection; AirQR needs nothing but a camera and a screen. PRIVACY BY DESIGN Your files travel as light between two screens. They're never uploaded, cached, or transmitted over any network. No account, no sign-in, no data ever leaves your devices. SMART COMPRESSION AirQR automatically compresses content so transfers are as efficient as possible: • Photos are resized and re-encoded as JPEG • Videos are re-encoded with H.265 for a light, shareable file • Documents and text are compressed with LZMA — lossless, byte-identical on arrival Built for what it's great at: links, passwords, notes, small photos, and documents moving across a gap no network can bridge. For your original-quality camera roll or a big video library, your everyday same-network tools are still the better fit — AirQR earns its place for the moments those tools can't reach at all. SHARE EXTENSION Tap Share in Photos, Safari, Files, or any app and choose AirQR to beam content instantly — without switching apps first. BUILT FOR RELIABILITY Every QR frame carries a CRC integrity check. Corrupted or missed frames are silently discarded and re-scanned, so the transfer shrugs off brief obstructions or screen glare. AirQR is ideal for: — Sharing files without a corporate network or the same Wi-Fi — Swapping a link, password, or note between two devices — Sending sensitive documents without cloud storage ever touching them — Transferring files in classrooms, conferences, or dead zones with no signal — Air-gapped and security-conscious workflows More at https://apps.qaqee.com