diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9bd17d4..d301a92 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -59,10 +59,10 @@ jobs:
           cache: pip
           cache-dependency-path: pyproject.toml
       - run: pip install --upgrade pip
-      # ``-e .[dev,visualization,excel]`` so every optional extra is exercised.
+      # ``-e .[dev,excel]`` so every optional extra is exercised.
       # Gurobi is not installable on free runners; the relevant tests
       # skip themselves when ``optlang.gurobi_interface`` cannot import.
-      - run: pip install -e ".[dev,visualization,excel]"
+      - run: pip install -e ".[dev,excel]"
       - run: pytest -q --maxfail=5 --durations=20
 
   docs:
@@ -77,7 +77,7 @@ jobs:
           cache-dependency-path: pyproject.toml
       - run: pip install --upgrade pip
       # The package (with autodoc's import-time extras) plus the docs toolchain.
-      - run: pip install -e ".[excel,visualization]" -r docs/requirements.txt
+      - run: pip install -e ".[excel]" -r docs/requirements.txt
       # ``-W --keep-going`` keeps the docs build warning-clean; mirrors the
       # ReadTheDocs build (docs/conf.py + .readthedocs.yaml).
       - run: sphinx-build -b html -W --keep-going docs docs/_build/html
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 35b2d10..c8f3257 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -21,7 +21,6 @@ python:
       path: .
       extra_requirements:
         - excel
-        - visualization
     - requirements: docs/requirements.txt
 
 formats:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a13c6d3..879c6b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,12 @@ Milestones in the raven-python port. For function-level status see
 [docs/raven_migration.md](https://github.com/SysBioChalmers/raven-python/blob/develop/docs/reference/migration.md); for open work see
 [docs/todo.md](https://github.com/SysBioChalmers/raven-python/blob/develop/docs/reference/todo.md).
 
+## Unreleased
+
+* **Removed the `visualization` stub and `[visualization]` extra**, mirroring MATLAB
+  RAVEN dropping its pathway-map / omics-overlay plotting functions (`drawMap`,
+  `colorPathway`, etc.) as obsolete. cobrapy + Escher cover this externally.
+
 ## 0.1.0 — 2026-06-10
 
 First release with **published, downloadable KEGG artefacts**, plus a cobra-aligned
diff --git a/README.md b/README.md
index 039f861..b3cf8fb 100644
--- a/README.md
+++ b/README.md
@@ -53,8 +53,6 @@ omissions:
 Planned or partial functionality still on the books (full detail in
 **[docs/todo.md](docs/reference/todo.md)**):
 
-- [ ] **Visualization (`visualization/`)** — pathway maps (Escher), omics-overlay and
-  flux-distribution plots. *The main open item.*
 - [ ] **Metabolomics-based scoring in tINIT / ftINIT** — passing a non-empty `metabolomics`
   argument currently raises `NotImplementedError`.
 - [ ] **Published binary release ZIPs** (BLAST / DIAMOND / HMMER) — the resolver in
diff --git a/docs/README.md b/docs/README.md
index d3ac917..2a6d521 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -6,7 +6,7 @@ The rendered documentation is built with **Sphinx** (MyST Markdown) and hosted o
 Build it locally:
 
 ```bash
-pip install -e ".[excel,visualization]"
+pip install -e ".[excel]"
 pip install -r docs/requirements.txt
 sphinx-build -b html docs docs/_build/html
 # open docs/_build/html/index.html
diff --git a/docs/installation.md b/docs/installation.md
index f09afe6..4ed3d56 100644
--- a/docs/installation.md
+++ b/docs/installation.md
@@ -18,11 +18,10 @@ Some features need extra packages, exposed as optional extras:
 | Extra | Pulls in | Needed for |
 | --- | --- | --- |
 | `excel` | `openpyxl` | {func}`raven_python.io.excel.export_to_excel` |
-| `visualization` | `matplotlib` | visualisation (Phase 6, in progress) |
 | `dev` | `pytest`, `pytest-cov`, `ruff` | running the test-suite / linting |
 
 ```bash
-pip install -e ".[excel,visualization,dev]"
+pip install -e ".[excel,dev]"
 ```
 
 ## Solvers
diff --git a/docs/reference/api/index.md b/docs/reference/api/index.md
index 93224e9..5381a7e 100644
--- a/docs/reference/api/index.md
+++ b/docs/reference/api/index.md
@@ -23,8 +23,3 @@ analysis
 comparison
 resolvers
 ```
-
-:::{note}
-The `visualization` subpackage is a stub — pathway-map and omics-overlay visualisation
-(Phase 6) is not yet implemented.
-:::
diff --git a/docs/reference/todo.md b/docs/reference/todo.md
index ac40abc..174f47b 100644
--- a/docs/reference/todo.md
+++ b/docs/reference/todo.md
@@ -6,17 +6,6 @@ catalogue of raven-python improvements that should also be back-ported into MATL
 
 ## Major
 
-### Visualization (`visualization/`)
-
-Not started. RAVEN has limited plotting (`drawMap` etc., MATLAB-bound). For raven-python the most
-useful targets are:
-
-* Pathway maps / Escher integration for context-specific models.
-* Omics overlay (gene-score / expression heatmaps on the reaction set).
-* Flux distribution overlays.
-
-cobrapy + Escher already covers a lot here — likely a thin integration layer rather than a port.
-
 ### Metabolomics-based scoring in ftINIT
 
 The metabolomics-detected metabolite production-reward block in [`init.ftinit`](https://github.com/SysBioChalmers/raven-python/blob/develop/src/raven_python/init/ftinit.py)
diff --git a/pyproject.toml b/pyproject.toml
index c847ed3..69a28fc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -55,9 +55,6 @@ dev = [
 excel = [
     "openpyxl>=3.1",
 ]
-visualization = [
-    "matplotlib>=3.5",
-]
 
 [project.urls]
 Homepage = "https://github.com/SysBioChalmers/raven-python"
diff --git a/src/raven_python/visualization/__init__.py b/src/raven_python/visualization/__init__.py
deleted file mode 100644
index 613f1e2..0000000
--- a/src/raven_python/visualization/__init__.py
+++ /dev/null
@@ -1,15 +0,0 @@
-"""Pathway-map and omics-overlay visualisation (stub — not yet implemented)."""
-from __future__ import annotations
-
-
-def __getattr__(name: str):
-    # PEP 562: accessing any attribute of this stub package fails with a clear,
-    # actionable message rather than a bare AttributeError. Dunder lookups
-    # (``__path__`` etc.) fall through to normal handling.
-    if name.startswith("__"):
-        raise AttributeError(name)
-    raise NotImplementedError(
-        f"raven_python.visualization.{name!r} is not implemented yet. Pathway-map "
-        "and omics-overlay visualisation is on the roadmap; until then export the "
-        "model via raven_python.io and use an external viewer such as Escher."
-    )
diff --git a/tests/test_visualization.py b/tests/test_visualization.py
deleted file mode 100644
index 5cc2cef..0000000
--- a/tests/test_visualization.py
+++ /dev/null
@@ -1,9 +0,0 @@
-"""The visualization subpackage is a documented stub (not yet implemented)."""
-import pytest
-
-
-def test_visualization_stub_raises_not_implemented():
-    import raven_python.visualization as viz
-
-    with pytest.raises(NotImplementedError, match="not implemented yet"):
-        viz.draw_pathway()  # attribute access triggers __getattr__ and raises