diff --git a/bin/Print.ml b/bin/Print.ml
index 1a124d41..aec5e3fe 100644
--- a/bin/Print.ml
+++ b/bin/Print.ml
@@ -1,12 +1,18 @@
 open Odiff.Diff
 
+let esc = "\027["
+let red = esc ^ "31m"
+let green = esc ^ "32m"
+let bold = esc ^ "1m"
+let dim = esc ^ "2m"
+let reset = esc ^ "0m"
+
 let printDiffResult makeParsableOutput result =
-  let reset_ppf = Spectrum.prepare_ppf Format.str_formatter in
   (match (result, makeParsableOutput) with
   | Layout, true -> ()
   | Layout, false ->
-      Spectrum.Simple.printf "@{<red>%s!@} Images have different layout.\n"
-        "Failure!"
+      Format.printf "%s%sFailure!%s Images have different layout.\n" red bold
+        reset
   | Pixel (_output, diffCount, diffPercentage, stack), true
     when not (Stack.is_empty stack) ->
       Int.to_string diffCount ^ ";"
@@ -20,13 +26,13 @@ let printDiffResult makeParsableOutput result =
       |> print_endline
   | Pixel (_output, diffCount, _percentage, _lines), false when diffCount == 0
     ->
-      Spectrum.Simple.printf
-        "@{<green><bold>Success!@} Images are equal.\n\
-         @{<dim>No diff output created.@}"
+      Format.printf
+        "%s%sSuccess!%s Images are equal.\n%sNo diff output created.%s\n" green
+        bold reset dim reset
   | Pixel (_output, diffCount, diffPercentage, _lines), false ->
-      Spectrum.Simple.printf
-        "@{<red,bold>Failure!@} Images are different.\n\
-         Different pixels: @{<red,bold>%i (%f%%)@}" diffCount diffPercentage);
+      Format.printf
+        "%s%sFailure!%s Images are different.\n\
+         Different pixels: %s%s%i (%f%%)%s\n"
+        red bold reset red bold diffCount diffPercentage reset);
 
-  reset_ppf ();
   result
diff --git a/bin/dune b/bin/dune
index a9c7b904..1d02511d 100644
--- a/bin/dune
+++ b/bin/dune
@@ -4,11 +4,12 @@
  (package odiff)
  (flags
   (:standard -w -27))
- (libraries odiff-core odiff-io cmdliner spectrum))
+ (libraries odiff-core odiff-io cmdliner))
 
 (env
  (dev
-  (flags (:standard -w +42)))
+  (flags (:standard -w +42))
+  (ocamlopt_flags (:standard -S)))
  (release
   (ocamlopt_flags (:standard -O3 -rounds 5 -unbox-closures -inline 200 -inline-max-depth 7 -unbox-closures-factor 50))))
 
diff --git a/dune-project b/dune-project
index e6eea588..b13970a9 100644
--- a/dune-project
+++ b/dune-project
@@ -24,7 +24,6 @@
   odiff-core
   odiff-io
   (cmdliner (= 1.3.0))
-  (spectrum (= 0.6.0))
  )
 )
 
diff --git a/odiff.opam b/odiff.opam
index d845876d..2148379f 100644
--- a/odiff.opam
+++ b/odiff.opam
@@ -11,7 +11,6 @@ depends: [
   "odiff-core"
   "odiff-io"
   "cmdliner" {= "1.3.0"}
-  "spectrum" {= "0.6.0"}
   "odoc" {with-doc}
 ]
 build: [