# ultravnc/UltraVNC

👁️ UltraVNC Server, UltraVNC Viewer, UltraVNC Repeater and UltraVNC SC | Official repository: https://github.com/ultravnc/UltraVNC

Repository: https://github.com/ultravnc/UltraVNC
Canonical: https://ross.abutalabs.com/products/ultravnc
Homepage: https://uvnc.com
Language: C++
License: GPL-3.0
License Family: copyleft
Topics: ultravnc, uvnc, winvnc, vnc, rfb, virtualnetworkcomputing, remoteframebuffer, vnc-server, vnc-client, vnc-viewer, vnc-installer, vnc-setup, uvnc-sc, vncviewer, ultravnc-sc, winvnc-sc, remoteaccess, remotedesktop, remotepc, remotesoftware
Last push: 2026-08-23T18:39:06+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 35, longevity 100
- inputs: {"age_days": 2173, "days_push": 10, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1426, forks 285 (observed 2026-08-28T04:04:41.699555+00:00)

## What it is
UltraVNC is a free, open-source VNC (Virtual Network Computing) suite for Windows comprising a VNC Server, Viewer, Repeater proxy, and Single Click (SC) lightweight server. It implements the RFB protocol to view and control a remote computer's screen, keyboard, and mouse over a network or the internet.

## Use cases
- remotely control a Windows PC from another computer
- provide remote IT support to customers without installing software
- connect to machines behind NAT or firewalls via a repeater
- view and manage multiple remote desktops in tabs
- transfer files to and from a remote computer
- set up a free self-hosted alternative to TeamViewer

## When to choose
- you need free, open-source remote desktop access for Windows machines
- you support customers who need one-click, no-install remote connections
- you must traverse NAT/firewalls using a repeater or reverse connections
- you want VNC features like file transfer, chat, and MS-Logon authentication

## When to avoid
- you need cross-platform server support (UltraVNC is Windows-only)
- you need a polished commercial-grade remote support product with session recording
- your environment requires modern encrypted-by-default protocols like RDP or proprietary solutions out of the box

## Facets
- artifact type: application
- maturity: active
- function: networking, security, gui
- domain: cross-platform, windows, self-hosted, developer-tools, privacy
- platform: windows, cpp
- tags: vnc, rfb-protocol, remote-access, remote-support, vnc-server, vnc-viewer, repeater, single-click, helpdesk, nat-traversal, remote-desktop, file-transfer, desktop

## Member repositories
- ultravnc/UltraVNC (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:41.699555+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:37:29.186641+00:00, confidence not recorded.
  - readme: https://github.com/ultravnc/UltraVNC (fetched 2026-08-28T04:04:41.699555+00:00, sha f6ceed8ffccb)
  - homepage: https://uvnc.com (fetched 2026-08-29T11:49:28.961623+00:00, sha b6d818ccb4ab)
  - site_page: https://uvnc.com/docs/ultravnc-server.html (fetched 2026-08-29T11:49:28.970592+00:00, sha f2c0a2fd5142)
  - site_page: https://uvnc.com/docs/ultravnc-viewer.html (fetched 2026-08-29T11:49:28.972221+00:00, sha e50c9c24627c)
  - site_page: https://uvnc.com/docs/ultravnc-repeater.html (fetched 2026-08-29T11:49:28.974107+00:00, sha c5fbd0556bd5)
  - site_page: https://uvnc.com/docs/ultravnc-sc.html (fetched 2026-08-29T11:49:28.975801+00:00, sha c912a012adad)
  - site_page: https://uvnc.com/docs/documentation.html (fetched 2026-08-29T11:49:28.978540+00:00, sha c935bd68ea29)
  - site_page: https://uvnc.com/docs/general-knowledge.html (fetched 2026-08-29T11:49:28.980683+00:00, sha a39662ae3298)
  - site_page: https://uvnc.com/docs/pchelpware.html (fetched 2026-08-29T11:49:28.982514+00:00, sha 1758aa049809)
  - site_page: https://uvnc.com/docs/ultravnc-translations.html (fetched 2026-08-29T11:49:28.984239+00:00, sha 2bf0522ae888)
- Data as of 2026-08-30T08:39:29.467469+00:00.