QDROP gen-2

Send files straight to a friend's computer — sealed, free, and with no server in the middle. Now on the X-Protocol.

QDROP gen-2 moves files and messages from your computer directly to your friend's computer. No account, no cloud, no company in between — and no relay of any kind: the public edition doesn't use one, ours or anyone's. You add a friend by swapping a connect code (send it by text, email, anything) — one swap and you're friends both ways. Then your computers find each other on their own and talk, sealed end to end.

Share your music with each other without the threat of someone watching your every move.

FREE. Not a trial, not a teaser — QDROP gen-2 is free, and it stays free.

Gen-2 downloads are paused while we fix a connection bug. Back soon.

How to use it — gen-2

1. Make your card. Open QDROP gen-2, pick a name — any name you like — and press “Make my card.” Your identity is born on your own computer at that moment; nothing is sent anywhere. The program shows your Q-Number — it's derived from your card itself; nobody issues it.
2. Copy your code. Press “Copy my code” and send that text to your friend by text, email, anything. A code works once, for one friend, and stops working after 24 hours — a fresh one is one press.
3. Add your friend. Paste their code into “Paste their code here” and press “Add their code.” That's the whole introduction: one swap makes you friends both ways — they don't have to send you a code back.
4. Connect. You never connect by hand. QDROP climbs its ladder for you: same network first, then the doors it already knows, both sides knocking at once, the doors written into the code, and your router opening its own door if it can. If everything fails, it says so in plain words — the last resort is one door number you open yourself, explained up front, never sprung on you.
5. Drop. Pick your friend, type words and press “Send words,” or press “Send a file…” (no 25 MB cap anymore). Files travel in small sealed pieces, and a send that gets interrupted resumes where it stopped — even if a program dies mid-file, it picks up from its own disk when it returns. If your friend is offline, your Outbox holds the drop on your machine and delivers it when they reappear. Arriving files are checked against their SHA-256 fingerprint before they land in your .qdrop-gen2/downloads folder.

The two editions

• Public edition (this page): for everybody. It contains no house service and no relay of any kind — not ours, and not one you bring yourself. If the ladder can't connect you, QDROP tells you plainly; it never falls back to a relay.
• QDROP Gen2: the second generation, for circles who share a Tailscale network — families, small crews, close friends. It rides that private road as a door it already knows: proven live on October 29, 2026, pairing in under a second with words and files both ways. It has its own page and manual: QDROP Gen2. It carries the full direct engine too; the two-household open-internet road is in final field testing.

The editions, side by side: the Public edition is below on this page; QDROP Gen2 has its own page — what it is, its manual, and its downloads as they open.

What it does — and what it doesn't (the honest label)

• Two houses: gen-2 is built to cross between different homes — that's the ladder above. One honest exception: if an internet provider keeps a customer behind a locked gate of the provider's own (carrier-grade NAT), no program can open that gate from inside, and QDROP says so in plain words instead of spinning forever. Home-network drops always work.
• Both computers on: a drop travels while both sides run QDROP. If your friend's computer is off, the drop waits in your Outbox — and mid-file hiccups, dead programs, and dropped connections resume instead of starting over. QDROP is built for bad skies: generous timeouts, calm retries, no chatter.
• Friends only: only people you have swapped codes with can send you anything. A stranger who knows your door gets refused — the introduction is the gate.
• Everything stays home: your identity, friends, history, and waiting drops live on your own computer (.qdrop-gen2 in your home folder). Nothing is uploaded anywhere, ever.

How the sealing works — in plain words

• What's agreed: when you and a friend connect, your two computers quietly work out one shared secret between them. Each side uses its own private key — born on your computer, never sent anywhere — together with the friend's public key from their card. Only your two computers can arrive at that secret; it's never spoken on the wire.
• What rides in it: every message and every piece of every file is sealed with that secret before it leaves your machine, and each new message gets a fresh key stepped from a one-way chain — so keys keep moving forward and yesterday's traffic stays sealed even in tomorrow's storm.
• What an attacker would have to break: they'd have to take the private key off your computer itself, or break the mathematics outright. Anyone listening in between sees only sealed noise. And if you ever doubt a connection is really your friend, the program shows your card's fingerprint and both Q-Numbers — read them to each other any way you like; if they match, it's really them.
• Proof of arrival: the receiving side checks the whole file against its fingerprint (a SHA-256 checksum) before it ever lands in the downloads folder. A file that doesn't match doesn't arrive — simple as that.

For the technical reader: X3DH-style key agreement over Curve25519 (X25519 identity/signed-prekey bundles, Ed25519 signatures), ChaCha20-Poly1305 AEAD sealing with an HKDF-SHA-256 hash-chain ratchet, SHA-256 whole-file verification. The plain words above are the same story, told straight.

Coming later

Relay, the house way: a relay server program is a separate 777 Software product in the works — when it ships, the apps gain the ability to ride a relay you run, never one of ours in the public edition. And after that, QMESH.

QDROP Direct — first generation

The original QDROP, still free and still working exactly as it always has. It pairs by contact card on the same network and does not pair with gen-2.

QDROP is a 777 Software program, offered free. It makes no accounts, phones home nowhere, and the public edition contacts no server of any kind and uses no relay — that's not a promise in a policy document; the program is built so it can't.

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