The best alternatives to SendSecure.io are Envelop, ShareDrop, and Tachyon. If these 3 options don't work for you, we've listed a few more alternatives below.
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Tachyon is a developer-first API, that makes big data transfer a breeze. For example we help life sciences companies move around terabytes of sequencing information in a fast, secure painless way.
Salad Room is a web app to share text, links or files quickly between devices. Magically connecting them on the same network. Like AirDrop, but for everyone.
Developers often require test builds to be sent out to the test users. While test flight does a great job, it is often time consuming. OverAir allows users to upload theIPA andAPK with signed developer certificate and profiles, for eligible users.
Share personal documents and files safely and securely. SendSecurely features end-to-end encryption, fully configurable access control lists (ACLs), and comprehensive auditing of file access - all backed by permissioned blockchain technologies.
Sendthis.one is a product that would allow users to share files or text with each other without going through any identification. The data will be uploaded anonymously and through the QR code or the unique code generated the receiver can download the data.