diff --git a/DESCRIPTION b/DESCRIPTION
index 938a487..1bd0629 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -38,7 +38,7 @@ Imports:
     yardstick
 Suggests:
     derivoce,
-    fancygam,
+    fancyfx,
     knitr,
     leaflet,
     ranger,
@@ -55,7 +55,7 @@ Suggests:
 Remotes:
     chross22/datamatch,
     chross22/derivoce,
-    chross22/fancygam
+    chross22/fancyfx
 Config/testthat/edition: 3
 VignetteBuilder: knitr
 URL: https://github.com/chross22/taupatch
diff --git a/R/plot_effects.R b/R/plot_effects.R
index 5d2eaf2..0997a89 100644
--- a/R/plot_effects.R
+++ b/R/plot_effects.R
@@ -188,7 +188,7 @@ plot_glm_coefficients <- function(coefficients, path = NULL) {
 #' The `ranger`, `xgb.Booster`, `glm`, or `gam` object inside the workflow,
 #' rather than the workflow wrapping it. Anything that plots or interrogates a
 #' model directly needs this rather than the tidymodels object — including
-#' [fancygam](https://github.com/chross22/fancygam), whose `plotSmooths()` takes
+#' [fancyfx](https://github.com/chross22/fancyfx), whose `plotEffects()` takes
 #' an `mgcv` fit, which is what this returns for `model.type: gam`.
 #'
 #' @param model a fitted model from [fit_patch_model()], or a fitted workflow
@@ -196,7 +196,7 @@ plot_glm_coefficients <- function(coefficients, path = NULL) {
 #' @examples
 #' \dontrun{
 #' # Prettier smooths than the generic partial effects can give:
-#' fancygam::plotSmooths(model_engine_fit(model))
+#' fancyfx::plotEffects(model_engine_fit(model), dat, "SST")
 #' }
 #' @export
 model_engine_fit <- function(model) {
@@ -239,16 +239,28 @@ gam_smooth_terms <- function(fitted) {
   out[order(-out$edf), ]
 }
 
-#' Whether fancygam is available to draw smooths
+#' Whether fancyfx is available to draw smooths
 #'
 #' Its own function so the optional path can be exercised in tests without
 #' mocking `requireNamespace()` itself, which every package that loads a
 #' graphics device also goes through.
 #'
-#' @return `TRUE` when fancygam is installed
+#' @section It used to be called fancygam:
+#' The package was renamed when it grew past GAMs. The rename is why this
+#' matters more than a find-and-replace: `chross22/fancygam` still resolves on
+#' GitHub, so `Remotes: chross22/fancygam` kept installing — but what it
+#' installs now declares `Package: fancyfx`, so `requireNamespace("fancygam")`
+#' returned `FALSE` on every fresh install and the smooth plots were skipped in
+#' silence. Anyone with the old package still sitting in their library saw
+#' nothing wrong.
+#'
+#' That is the failure mode to watch for here: this function gates a diagnostic
+#' rather than the run, so a wrong answer costs a plot and no error.
+#'
+#' @return `TRUE` when fancyfx is installed
 #' @keywords internal
-has_fancygam <- function() {
-  requireNamespace("fancygam", quietly = TRUE)
+has_fancyfx <- function() {
+  requireNamespace("fancyfx", quietly = TRUE)
 }
 
 #' Variables a fitted GAM gave a smooth to
@@ -267,7 +279,7 @@ gam_smoothed_variables <- function(fitted) {
   sub("^s\\((.*)\\)$", "\\1", terms)
 }
 
-#' Plot a GAM's fitted smooths, with fancygam
+#' Plot a GAM's fitted smooths, with fancyfx
 #'
 #' The partial effect of each smooth term on the log-odds scale, with its
 #' standard error band and a rug showing where the data actually is. This is the
@@ -275,7 +287,7 @@ gam_smoothed_variables <- function(fitted) {
 #' rather than reconstructed by prediction, so it carries uncertainty, which a
 #' partial dependence curve cannot.
 #'
-#' Drawn by [fancygam](https://github.com/chross22/fancygam), which is a Suggests
+#' Drawn by [fancyfx](https://github.com/chross22/fancyfx), which is a Suggests
 #' — a run without it still gets the generic partial effect curves.
 #'
 #' @section Why the axes read in standard deviations:
@@ -297,9 +309,9 @@ gam_smoothed_variables <- function(fitted) {
 #' @seealso [gam_smooth_terms()] for the numbers behind these
 #' @export
 plot_gam_smooths <- function(model, vars = NULL, path = NULL) {
-  if (!has_fancygam()) {
-    stop("The 'fancygam' package is required to plot GAM smooths. ",
-         "Install it with remotes::install_github('chross22/fancygam').",
+  if (!has_fancyfx()) {
+    stop("The 'fancyfx' package is required to plot GAM smooths. ",
+         "Install it with remotes::install_github('chross22/fancyfx').",
          call. = FALSE)
   }
   workflow <- if (inherits(model, "workflow")) model else model$workflow
@@ -314,7 +326,7 @@ plot_gam_smooths <- function(model, vars = NULL, path = NULL) {
   # would be drawn on different x scales and quietly disagree.
   baked <- as.data.frame(workflows::extract_mold(workflow)$predictors)
 
-  plot <- fancygam::combinePlots(model_engine_fit(workflow), baked, vars)
+  plot <- fancyfx::combinePlots(model_engine_fit(workflow), baked, vars)
 
   if (is.null(path)) return(plot)
   ggplot2::ggsave(path, plot = plot, dpi = 150,
@@ -371,9 +383,9 @@ write_effect_plots <- function(model, out) {
     }
 
     # The fitted smooths themselves, with their uncertainty. Skipped without a
-    # word when fancygam is absent: it is a Suggests, and the generic partial
+    # word when fancyfx is absent: it is a Suggests, and the generic partial
     # effect curves above already cover the question.
-    if (has_fancygam()) {
+    if (has_fancyfx()) {
       smooths <- try_diagnostic(
         plot_gam_smooths(model, path = file.path(out, "gam_smooths.png")),
         "GAM smooth plots"
diff --git a/README.md b/README.md
index b6868e0..da86acf 100644
--- a/README.md
+++ b/README.md
@@ -877,13 +877,13 @@ On top of that, each model contributes what only it can:
 | `gam` | Effective degrees of freedom per smooth. An `edf` of 1 means the smooth collapsed to a line |
 | `rf` / `brt` | None. The partial effect curve *is* their answer |
 
-With [`fancygam`](https://github.com/chross22/fancygam) installed, a GAM also
+With [`fancyfx`](https://github.com/chross22/fancyfx) installed, a GAM also
 gets its **fitted smooths** drawn — each term with its standard error band and a
 rug showing where the data actually is. Those carry uncertainty, which a partial
 dependence curve cannot:
 
 ```r
-remotes::install_github("chross22/fancygam")
+remotes::install_github("chross22/fancyfx")
 ```
 
 Their x axes read in standard deviations, because the smooths belong to the model
@@ -1182,7 +1182,7 @@ diagnostics/cv_predictions.csv     held-out predictions, for any metric not tabu
 diagnostics/partial_effects.png    what each predictor does to patch probability
 diagnostics/coefficients.png       glm only: signed effects with intervals
 diagnostics/smooth_terms.csv       gam only: effective degrees of freedom per smooth
-diagnostics/gam_smooths.png        gam only, with fancygam: fitted smooths with error bands
+diagnostics/gam_smooths.png        gam only, with fancyfx: fitted smooths with error bands
 diagnostics/members/<type>/        with model.ensemble: the above, one directory per algorithm
 projections/suitability.csv       every cell of every month: species, year, month, lon, lat, probability
                                   plus the interval and novelty columns, with projection.uncertainty
diff --git a/inst/shiny/app.R b/inst/shiny/app.R
index ed882ad..ac3e084 100644
--- a/inst/shiny/app.R
+++ b/inst/shiny/app.R
@@ -1210,16 +1210,16 @@ server <- function(input, output, session) {
   # A GAM has its own partial effects, and they are better than the generic
   # ones: read out of the fitted model rather than reconstructed by prediction,
   # so they carry the uncertainty a partial dependence curve cannot.
-  use_fancygam <- reactive({
+  use_fancyfx <- reactive({
     identical(run_result()$model$type, "gam") &&
-      requireNamespace("fancygam", quietly = TRUE)
+      requireNamespace("fancyfx", quietly = TRUE)
   })
 
   output$partial_effects_note <- renderUI({
     req(run_result())
-    if (isTRUE(use_fancygam())) {
+    if (isTRUE(use_fancyfx())) {
       return(helpText("The model's own smooths, with standard error bands and a",
-                      "rug showing where the data is, drawn by fancygam. The x",
+                      "rug showing where the data is, drawn by fancyfx. The x",
                       "axes are in standard deviations because the model was",
                       "fitted on the centred and scaled predictors - turn off",
                       "'Centre and scale' to read them in the covariate's own",
@@ -1233,7 +1233,7 @@ server <- function(input, output, session) {
 
   output$partial_effects <- renderPlot({
     req(run_result())
-    if (isTRUE(use_fancygam())) {
+    if (isTRUE(use_fancyfx())) {
       return(suppressMessages(plot_gam_smooths(run_result()$model)))
     }
     effects <- run_effects()
@@ -1257,7 +1257,7 @@ server <- function(input, output, session) {
     }
     if (identical(model$type, "gam")) {
       # The smooths themselves are the partial effects panel above when
-      # fancygam is present, so they are not repeated here.
+      # fancyfx is present, so they are not repeated here.
       return(tagList(
         h4("Smooth terms"),
         helpText("Effective degrees of freedom per smooth. An edf of 1 means",
diff --git a/man/has_fancyfx.Rd b/man/has_fancyfx.Rd
new file mode 100644
index 0000000..a35d08d
--- /dev/null
+++ b/man/has_fancyfx.Rd
@@ -0,0 +1,31 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/plot_effects.R
+\name{has_fancyfx}
+\alias{has_fancyfx}
+\title{Whether fancyfx is available to draw smooths}
+\usage{
+has_fancyfx()
+}
+\value{
+\code{TRUE} when fancyfx is installed
+}
+\description{
+Its own function so the optional path can be exercised in tests without
+mocking \code{requireNamespace()} itself, which every package that loads a
+graphics device also goes through.
+}
+\section{It used to be called fancygam}{
+
+The package was renamed when it grew past GAMs. The rename is why this
+matters more than a find-and-replace: \code{chross22/fancygam} still resolves on
+GitHub, so \code{Remotes: chross22/fancygam} kept installing — but what it
+installs now declares \code{Package: fancyfx}, so \code{requireNamespace("fancygam")}
+returned \code{FALSE} on every fresh install and the smooth plots were skipped in
+silence. Anyone with the old package still sitting in their library saw
+nothing wrong.
+
+That is the failure mode to watch for here: this function gates a diagnostic
+rather than the run, so a wrong answer costs a plot and no error.
+}
+
+\keyword{internal}
diff --git a/man/has_fancygam.Rd b/man/has_fancygam.Rd
deleted file mode 100644
index f28451e..0000000
--- a/man/has_fancygam.Rd
+++ /dev/null
@@ -1,17 +0,0 @@
-% Generated by roxygen2: do not edit by hand
-% Please edit documentation in R/plot_effects.R
-\name{has_fancygam}
-\alias{has_fancygam}
-\title{Whether fancygam is available to draw smooths}
-\usage{
-has_fancygam()
-}
-\value{
-\code{TRUE} when fancygam is installed
-}
-\description{
-Its own function so the optional path can be exercised in tests without
-mocking \code{requireNamespace()} itself, which every package that loads a
-graphics device also goes through.
-}
-\keyword{internal}
diff --git a/man/model_engine_fit.Rd b/man/model_engine_fit.Rd
index 6439a70..5912a0d 100644
--- a/man/model_engine_fit.Rd
+++ b/man/model_engine_fit.Rd
@@ -16,12 +16,12 @@ the engine's own fitted object
 The \code{ranger}, \code{xgb.Booster}, \code{glm}, or \code{gam} object inside the workflow,
 rather than the workflow wrapping it. Anything that plots or interrogates a
 model directly needs this rather than the tidymodels object — including
-\href{https://github.com/chross22/fancygam}{fancygam}, whose \code{plotSmooths()} takes
+\href{https://github.com/chross22/fancyfx}{fancyfx}, whose \code{plotEffects()} takes
 an \code{mgcv} fit, which is what this returns for \code{model.type: gam}.
 }
 \examples{
 \dontrun{
 # Prettier smooths than the generic partial effects can give:
-fancygam::plotSmooths(model_engine_fit(model))
+fancyfx::plotEffects(model_engine_fit(model), dat, "SST")
 }
 }
diff --git a/man/plot_gam_smooths.Rd b/man/plot_gam_smooths.Rd
index 1f8ddde..e0831bb 100644
--- a/man/plot_gam_smooths.Rd
+++ b/man/plot_gam_smooths.Rd
@@ -2,7 +2,7 @@
 % Please edit documentation in R/plot_effects.R
 \name{plot_gam_smooths}
 \alias{plot_gam_smooths}
-\title{Plot a GAM's fitted smooths, with fancygam}
+\title{Plot a GAM's fitted smooths, with fancyfx}
 \usage{
 plot_gam_smooths(model, vars = NULL, path = NULL)
 }
@@ -24,7 +24,7 @@ rather than reconstructed by prediction, so it carries uncertainty, which a
 partial dependence curve cannot.
 }
 \details{
-Drawn by \href{https://github.com/chross22/fancygam}{fancygam}, which is a Suggests
+Drawn by \href{https://github.com/chross22/fancyfx}{fancyfx}, which is a Suggests
 — a run without it still gets the generic partial effect curves.
 }
 \section{Why the axes read in standard deviations}{
diff --git a/tests/testthat/test-effects.R b/tests/testthat/test-effects.R
index 674908f..8df1153 100644
--- a/tests/testthat/test-effects.R
+++ b/tests/testthat/test-effects.R
@@ -113,7 +113,7 @@ test_that("a GAM reports effective degrees of freedom per smooth", {
 
 test_that("the engine object comes out for anything that plots it directly", {
   skip_on_cran()
-  # fancygam::plotSmooths() and friends take the mgcv fit, not the workflow.
+  # fancyfx::plotEffects() and friends take the mgcv fit, not the workflow.
   expect_s3_class(model_engine_fit(fitted_of_type("glm")), "glm")
   skip_if_not_installed("mgcv")
   expect_s3_class(model_engine_fit(fitted_of_type("gam")), "gam")
@@ -173,10 +173,10 @@ test_that("the smoothed variables are read back off the fitted model", {
   expect_false(any(grepl("^s\\(", smoothed)))
 })
 
-test_that("fancygam draws the fitted smooths for a GAM", {
+test_that("fancyfx draws the fitted smooths for a GAM", {
   skip_on_cran()
   skip_if_not_installed("mgcv")
-  skip_if_not_installed("fancygam")
+  skip_if_not_installed("fancyfx")
   model <- fitted_of_type("gam")
 
   plot <- suppressMessages(plot_gam_smooths(model))
@@ -194,7 +194,7 @@ test_that("fancygam draws the fitted smooths for a GAM", {
 test_that("smooth plots are drawn against the data the model actually saw", {
   skip_on_cran()
   skip_if_not_installed("mgcv")
-  skip_if_not_installed("fancygam")
+  skip_if_not_installed("fancyfx")
   model <- fitted_of_type("gam")
 
   # gratia reports the smooths in the recipe's output units, so the rug has to
@@ -207,12 +207,12 @@ test_that("smooth plots are drawn against the data the model actually saw", {
   expect_gt(abs(mean(model$model_data$SST)), 1)
 })
 
-test_that("without fancygam the run still gets its generic curves", {
+test_that("without fancyfx the run still gets its generic curves", {
   skip_on_cran()
   skip_if_not_installed("mgcv")
-  # fancygam is a Suggests: its absence removes the extra plot, not the
+  # fancyfx is a Suggests: its absence removes the extra plot, not the
   # diagnostics.
-  local_mocked_bindings(has_fancygam = function() FALSE)
+  local_mocked_bindings(has_fancyfx = function() FALSE)
   out <- tempfile("diag"); dir.create(out)
   suppressMessages(suppressWarnings(write_effect_plots(fitted_of_type("gam"), out)))
   written <- list.files(out)