Juxt — image and render A/B comparison

LICENSE.txt

JUXT — LICENSE
===========================================================

This software is released as research. It is provided "as is" with no warranty
or fitness-for-purpose claim, implicit or explicit. The authors publish it to
document an ongoing design inquiry authored through Iterative LLM Co-Authorship
(ILCA) between Phil Renato and Claude (Anthropic) — not to support professional
or commercial workflows. See DISCLAIMER.txt for full context before use.

Juxt is published as a research artifact — a comparison and curation tool built
alongside Rendre — not as a commercial product. It is made available for use,
study, and teaching at renato.design free of charge, without accounts,
telemetry, or payment of any kind.

WHAT YOU MAKE IS YOURS
- Use it in the browser for any purpose, including in your own commercial
  design work: the comparisons, rankings, and exports YOU make are YOURS,
  entirely.
- Study it. The source is one readable HTML file by design.

LINEAGE. Juxt was built alongside Rendre (Phil Renato’s research renderer) — its
video-export pipeline and dependency-free ZIP writer/reader are ports of code
first written for Rendre — but Juxt is its own standalone tool, not a fork, and
takes anything you drop into it, from anywhere.

---

MIT License

Copyright (c) 2026 Phil Renato

⚠ THIRD-PARTY CARVE-OUT. The MIT grant below covers the code authored for this
project. It does NOT cover the third-party components it bundles, each of which
carries its own terms: mp4-muxer (MIT), IBM Plex Mono and Syne (SIL Open Font
License 1.1), and the Glicko-1 rating citation used by Cull & Rank and Tinct’s
blind test. All of them are named, with their licenses, in NOTICES.txt — read
that before redistributing any part of this. The grant also gives no right to
use the Juxt name to imply endorsement.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

DISCLAIMER.txt

JUXT — DISCLAIMER
===========================================================

Juxt is RESEARCH SOFTWARE — a research
artifact published for study and teaching, not a commercial
product. It is provided AS IS, without warranty of any kind,
express or implied. Use it at your own risk.

WHAT JUXT IS. An A/B and multi-way comparison tool for images
and video that runs entirely in your browser: wipe, blend,
checkerboard, and diff-heatmap modes; a pairwise Cull & Rank
mode; a Tinct color-palette generator and blind preference
test. No account, no upload, no cloud — nothing you drop in
ever leaves your machine. Offline-capable once installed.

RANKINGS ARE A CONVERGENCE TOOL, NOT A VERDICT. Cull & Rank
and Tinct's blind test use the Glicko-1 rating system to
converge a big batch to a ranked order in relatively few
comparisons. That's a statistical aid to a real decision you
still make by looking — not an objective judgment of quality,
and not a substitute for your own eye.

TINCT'S COLOR MATH IS REAL, ITS OUTPUT IS EXPLORATORY.
Palettes are computed in real OKLCH color space and rendered
into honest contexts, but they are a generative starting
point — not color-managed proofs. Final print or production
color decisions need a managed pipeline.

EXPORT / IMPORT. Sweep-to-video export is a genuine
QuickTime-compatible MP4 (WebCodecs, with a WebM fallback on
browsers that lack it); ZIP export bundles whatever's loaded.
The .juxt project file is Juxt's own format — it opens
reliably in Juxt itself, at any later date, but isn't a
general-purpose archive format for other tools.

BROWSER REQUIREMENTS. Juxt needs no special GPU — any current
Chrome, Safari, or Edge is enough. Very old browsers lacking
WebCodecs fall back to a WebM export instead of MP4.

NOTICES.txt

JUXT — THIRD-PARTY NOTICES + ASSET PROVENANCE
===========================================================
Juxt is RESEARCH SOFTWARE published as a
research artifact by Phil Renato (see LICENSE.txt + DISCLAIMER.txt).
This file lists what it uses and where the bundled assets came from.

RUNTIME LIBRARIES (vendored in this download)
-----------------------------------------------------------

IBM Plex Mono — SIL Open Font License 1.1, © IBM.
  Bundled as static woff2 files (400/500/600 weights) in vendor/font/
  so the app stays fully offline-installable with no runtime fetch.

Syne — SIL Open Font License 1.1, © the Syne Project Authors.
  Bold weight only, used for the RendreJuxt-branded wordmark (only
  rendered when Juxt is launched with ?from=rendre — the default
  Juxt wordmark stays IBM Plex Mono). Vendored locally the same way
  as IBM Plex Mono above (vendor/font/syne-700.woff2).

mp4-muxer — MIT License
  Copyright (c) 2022 Vanilagy
  https://github.com/Vanilagy/mp4-muxer

  Permission is hereby granted, free of charge, to any person
  obtaining a copy of this software and associated documentation
  files (the "Software"), to deal in the Software without
  restriction, including without limitation the rights to use,
  copy, modify, merge, publish, distribute, sublicense, and/or
  sell copies of the Software, and to permit persons to whom the
  Software is furnished to do so, subject to the following
  conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  OTHER DEALINGS IN THE SOFTWARE.

CODE PROVENANCE (methods reused from Rendre, Phil's own prior app)
-----------------------------------------------------------
Juxt's video-export pipeline (WebCodecs VideoEncoder → mp4-muxer,
with a WebM/MediaRecorder fallback for browsers without WebCodecs)
and its dependency-free ZIP writer are ports of code first written
for Rendre (rendre-web, Phil Renato + Claude). No third-party
licensed code beyond mp4-muxer itself is involved.

The Glicko-1 rating system used by Juxt's cull/ranking mode is a
published algorithm (Mark Glickman, "The Glicko system," Boston
University, 1995) — the JavaScript implementation here was written
for Juxt from the public formulas, not copied from any Glicko
reference implementation.

PROVENANCE NOTE: Juxt's first working deploy (v00000-001) was
committed to the shared philrenato-web repo's history under a commit
labeled for an unrelated app ("glisten v214") — a one-time git mixup
during a shared checkout, resolved operationally with no data lost.
Noted here for anyone archaeologizing the launch.

BUNDLED ASSETS
-----------------------------------------------------------
The default "Sample A / Sample B" comparison pair shown on first
launch is generated procedurally at runtime (a small canvas
gradient + shapes script) — no photographs or third-party images
are bundled with this app.

TRADEMARKS
-----------------------------------------------------------
Juxt™ and RendreJuxt™ (the name this app takes when launched from
Rendre) are marks of Phil Renato. Ideas and source may travel; the
names may not. All other trademarks are the property of their
respective owners. "Rendre" is Phil Renato's own prior research app,
referenced here only to credit code lineage.

CONTACT
-----------------------------------------------------------
Phil Renato · renato.design · philrenato@gmail.com