diff --git a/lib/benchee/formatters/html.ex b/lib/benchee/formatters/html.ex
index a5143db..e929016 100644
--- a/lib/benchee/formatters/html.ex
+++ b/lib/benchee/formatters/html.ex
@@ -54,27 +54,23 @@ defmodule Benchee.Formatters.HTML do
 
     scenario_data =
       scenarios
-      # at best we'd keep the input order here, so no grouping
+      # at best we'd keep the input order here, so no grouping but its easiest for now
       |> Enum.group_by(fn scenario -> scenario.input_name end)
-      |> Enum.map(fn input_to_scenarios = {input_name, _scenarios} ->
-        # build index data
+      |> Map.new(fn input_to_scenarios = {input_name, _scenarios} ->
         {input_name,
          reports_for_input(input_to_scenarios, system, filename, unit_scaling, inline_assets)}
       end)
 
     index_data =
-      Enum.map(scenario_data, fn {input_name, {input_index_data, _input_scenarios}} ->
-        {input_name, input_index_data}
+      Enum.map(scenario_data, fn {input_name, scenarios} ->
+        {input_name, Enum.map(scenarios, fn {names, _content} -> names end)}
       end)
 
-    scenario_pages =
-      Enum.flat_map(scenario_data, fn {_input_name, {_input_index_data, input_scenarios}} ->
-        input_scenarios
-      end)
+    scenario_pages = scenario_data |> Map.values() |> List.flatten()
 
     index_page = build_index(index_data, filename, system, inline_assets)
 
-    # prolly don't need map here
+    # prolly don't need map here, but tests explode
     Map.new([index_page | scenario_pages])
   end
 
@@ -192,14 +188,7 @@ defmodule Benchee.Formatters.HTML do
       end)
 
     comparison = comparison_report(input_name, scenarios, system, filename, units, inline_assets)
-    data = [comparison | scenario_reports]
-
-    # getting a slight variation of the data out may seem weird but since `sequential_output/1` doesn't keep
-    # the same data around it's done for _some_ consistency and not to delegate knowledge of getting index
-    # data outside.
-    index_data = Enum.map(data, fn {names, _content} -> names end)
-
-    {index_data, data}
+    [comparison | scenario_reports]
   end
 
   defp scenario_report(scenario, system, units, inline_assets) do
@@ -249,16 +238,18 @@ defmodule Benchee.Formatters.HTML do
       end)
 
     comparison_report =
-      {names, _content} =
       comparison_report(input_name, scenarios, system, filename, units, inline_assets)
 
     create_single_file(comparison_report, filename)
 
-    [names | scenario_names]
+    {comparison_names, _content} = comparison_report
+
+    [comparison_names | scenario_names]
   end
 
   defp create_single_file(report, filename) do
-    # yes wrapping this may feel overdone but provides an easy switch if we introduce a nicer utility to Benchee
+    # yes wrapping this may feel overdone but provides an easy switch
+    # if we introduce a nicer utility to Benchee
     FileCreation.each([report], filename)
   end
 
@@ -276,9 +267,7 @@ defmodule Benchee.Formatters.HTML do
   end
 
   defp write_index(input_to_names, filename, system, inline_assets?) do
-    full_index_data = build_index_data(input_to_names, filename)
-    index_entry = {[], Render.index(full_index_data, system, inline_assets?)}
-
+    index_entry = build_index(input_to_names, filename, system, inline_assets?)
     create_single_file(index_entry, filename)
 
     :ok
diff --git a/samples/fast_sequential.exs b/samples/fast_sequential.exs
new file mode 100644
index 0000000..a5520a7
--- /dev/null
+++ b/samples/fast_sequential.exs
@@ -0,0 +1,18 @@
+# It is possible to use multiple formatters so that you have both the Console
+# output and an HTML file.
+list = Enum.to_list(1..10_000)
+map_fun = fn i -> [i, i * i] end
+
+Benchee.run(
+  %{
+    "flat_map" => fn -> Enum.flat_map(list, map_fun) end,
+    "map.flatten" => fn -> list |> Enum.map(map_fun) |> List.flatten() end
+  },
+  # kwargs to map conversions
+  formatters: [
+    fn suite -> Benchee.Formatters.HTML.sequential_output(suite, %{auto_open: false}) end
+  ],
+  time: 0.05,
+  memory_time: 0.05,
+  warmup: 0.01
+)
diff --git a/test/benchee/formatters/html_integration_test.exs b/test/benchee/formatters/html_integration_test.exs
index 6686148..11e6036 100644
--- a/test/benchee/formatters/html_integration_test.exs
+++ b/test/benchee/formatters/html_integration_test.exs
@@ -4,12 +4,12 @@ defmodule Benchee.Formatters.HTMLIntegrationTest do
 
   @test_directory "test_output"
   @base_name "my"
-  @file_path "#{@test_directory}/#{@base_name}.html"
+  @index_path "#{@test_directory}/#{@base_name}.html"
   @comparison_path "#{@test_directory}/#{@base_name}_comparison.html"
 
   @default_test_directory "benchmarks/output"
   @default_base_name "results"
-  @default_file_path "#{@default_test_directory}/#{@default_base_name}.html"
+  @default_index_path "#{@default_test_directory}/#{@default_base_name}.html"
   @default_comparison_path "#{@default_test_directory}/#{@default_base_name}_comparison.html"
 
   test "works just fine" do
@@ -17,13 +17,13 @@ defmodule Benchee.Formatters.HTMLIntegrationTest do
       time: 0.01,
       memory_time: 0.01,
       warmup: 0.02,
-      formatters: [{Benchee.Formatters.HTML, file: @file_path, auto_open: false}]
+      formatters: [{Benchee.Formatters.HTML, file: @index_path, auto_open: false}]
     ]
 
     assertion_data = %{
       comparison_path: @comparison_path,
       test_directory: @test_directory,
-      file_path: @file_path,
+      index_path: @index_path,
       base_name: @base_name
     }
 
@@ -41,7 +41,7 @@ defmodule Benchee.Formatters.HTMLIntegrationTest do
     assertion_data = %{
       comparison_path: @default_comparison_path,
       test_directory: @default_test_directory,
-      file_path: @default_file_path,
+      index_path: @default_index_path,
       base_name: @default_base_name
     }
 
@@ -53,13 +53,13 @@ defmodule Benchee.Formatters.HTMLIntegrationTest do
       time: 0.01,
       memory_time: 0,
       warmup: 0.02,
-      formatters: [{Benchee.Formatters.HTML, file: @file_path, auto_open: false}]
+      formatters: [{Benchee.Formatters.HTML, file: @index_path, auto_open: false}]
     ]
 
     assertion_data = %{
       comparison_path: @comparison_path,
       test_directory: @test_directory,
-      file_path: @file_path,
+      index_path: @index_path,
       base_name: @base_name
     }
 
@@ -71,19 +71,41 @@ defmodule Benchee.Formatters.HTMLIntegrationTest do
       time: 0,
       memory_time: 0.01,
       warmup: 0.02,
-      formatters: [{Benchee.Formatters.HTML, file: @file_path, auto_open: false}]
+      formatters: [{Benchee.Formatters.HTML, file: @index_path, auto_open: false}]
     ]
 
     assertion_data = %{
       comparison_path: @comparison_path,
       test_directory: @test_directory,
-      file_path: @file_path,
+      index_path: @index_path,
       base_name: @base_name
     }
 
     basic_test(benchee_options, assertion_data, run_time: false)
   end
 
+  test "works just fine using sequential_output" do
+    benchee_options = [
+      time: 0.01,
+      memory_time: 0.01,
+      warmup: 0.02,
+      formatters: [
+        fn suite ->
+          Benchee.Formatters.HTML.sequential_output(suite, %{file: @index_path, auto_open: false})
+        end
+      ]
+    ]
+
+    assertion_data = %{
+      comparison_path: @comparison_path,
+      test_directory: @test_directory,
+      index_path: @index_path,
+      base_name: @base_name
+    }
+
+    basic_test(benchee_options, assertion_data, run_time: true)
+  end
+
   test "doesn't crash if we're essentially measuring nothing" do
     capture_io(fn ->
       assert %Benchee.Suite{} =
@@ -109,29 +131,31 @@ defmodule Benchee.Formatters.HTMLIntegrationTest do
       )
 
       assert File.exists?(assertion_data.comparison_path)
+      sleep_path = "#{assertion_data.test_directory}/#{assertion_data.base_name}_sleep.html"
 
-      assert File.exists?(
-               "#{assertion_data.test_directory}/#{assertion_data.base_name}_sleep.html"
-             )
+      assert File.exists?(sleep_path)
 
-      assert File.exists?(
-               "#{assertion_data.test_directory}/#{assertion_data.base_name}_list.html"
-             )
+      list_path = "#{assertion_data.test_directory}/#{assertion_data.base_name}_list.html"
+      assert File.exists?(list_path)
 
-      assert File.exists?(assertion_data.file_path)
-      html = File.read!(assertion_data.comparison_path)
+      assert File.exists?(assertion_data.index_path)
+      comparison_html = File.read!(assertion_data.comparison_path)
 
-      assert html =~ "<body>"
-      assert html =~ "Sleep"
-      assert html =~ "List"
+      assert comparison_html =~ "<body>"
+      assert comparison_html =~ "Sleep"
+      assert comparison_html =~ "List"
 
       if Keyword.get(options, :run_time, false) do
-        assert html =~ "ips-comparison"
+        assert comparison_html =~ "ips-comparison"
       end
 
-      assert html =~ "System info</a>"
-      assert html =~ "benchee version"
-      assert html =~ "benchee_html version"
+      assert comparison_html =~ "System info</a>"
+      assert comparison_html =~ "benchee version"
+      assert comparison_html =~ "benchee_html version"
+
+      index_html = File.read!(assertion_data.index_path)
+      assert index_html =~ ~r/href="#{Path.basename(sleep_path)}"/
+      assert index_html =~ ~r/href="#{Path.basename(list_path)}"/
     end)
   after
     if File.exists?(assertion_data.test_directory), do: File.rm_rf!(assertion_data.test_directory)