diff --git a/.committee.exs b/.committee.exs
index 51f72ef1..91e94e2f 100644
--- a/.committee.exs
+++ b/.committee.exs
@@ -13,8 +13,10 @@ defmodule YourApp.Commit do
   To test: `mix committee.runner [pre_commit | post_commit]`
   """
   def pre_commit do
-    {_format_output, 0} = System.cmd("mix", ["format"] ++ staged_files([".ex", ".exs"]))
-    {_add_output, 0} = System.cmd("git", ["add"] ++ staged_files())
+    existing_staged_files = staged_files([".ex", ".exs"]) |> Enum.filter(&File.exists?(&1))
+
+    {_format_output, 0} = System.cmd("mix", ["format"] ++ existing_staged_files)
+    {_add_output, 0} = System.cmd("git", ["add"] ++ existing_staged_files)
     {:ok, "SUCCESS!"}
   end
 end
diff --git a/apps/xest/tui.exs b/apps/xest/tui.exs
new file mode 100644
index 00000000..64aeba25
--- /dev/null
+++ b/apps/xest/tui.exs
@@ -0,0 +1,23 @@
+defmodule Counter do
+  @behaviour Ratatouille.App
+
+  import Ratatouille.View
+
+  def init(_context), do: 0
+
+  def update(model, msg) do
+    case msg do
+      {:event, %{ch: ?+}} -> model + 1
+      {:event, %{ch: ?-}} -> model - 1
+      _ -> model
+    end
+  end
+
+  def render(model) do
+    view do
+      label(content: "Counter is #{model} (+/-)")
+    end
+  end
+end
+
+Ratatouille.run(Counter)
diff --git a/apps/xest_tui/.formatter.exs b/apps/xest_tui/.formatter.exs
new file mode 100644
index 00000000..d2cda26e
--- /dev/null
+++ b/apps/xest_tui/.formatter.exs
@@ -0,0 +1,4 @@
+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]
diff --git a/apps/xest_tui/.gitignore b/apps/xest_tui/.gitignore
new file mode 100644
index 00000000..5216c8e5
--- /dev/null
+++ b/apps/xest_tui/.gitignore
@@ -0,0 +1,27 @@
+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+xest_tui-*.tar
+
+
+# Temporary files for e.g. tests
+/tmp
diff --git a/apps/xest_tui/README.md b/apps/xest_tui/README.md
new file mode 100644
index 00000000..364fe6e3
--- /dev/null
+++ b/apps/xest_tui/README.md
@@ -0,0 +1,21 @@
+# Xest.TUI
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `xest_tui` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [
+    {:xest_tui, "~> 0.1.0"}
+  ]
+end
+```
+
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
+and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
+be found at [https://hexdocs.pm/xest_tui](https://hexdocs.pm/xest_tui).
+
diff --git a/apps/xest_tui/lib/xest/tui.ex b/apps/xest_tui/lib/xest/tui.ex
new file mode 100644
index 00000000..b7b3c211
--- /dev/null
+++ b/apps/xest_tui/lib/xest/tui.ex
@@ -0,0 +1,18 @@
+defmodule Xest.TUI do
+  @moduledoc """
+  Documentation for `Xest.TUI`.
+  """
+
+  @doc """
+  Hello world.
+
+  ## Examples
+
+      iex> Xest.TUI.hello()
+      :world
+
+  """
+  def hello do
+    :world
+  end
+end
diff --git a/apps/xest_tui/lib/xest/tui/application.ex b/apps/xest_tui/lib/xest/tui/application.ex
new file mode 100644
index 00000000..e88fd233
--- /dev/null
+++ b/apps/xest_tui/lib/xest/tui/application.ex
@@ -0,0 +1,20 @@
+defmodule Xest.TUI.Application do
+  # See https://hexdocs.pm/elixir/Application.html
+  # for more information on OTP Applications
+  @moduledoc false
+
+  use Application
+
+  @impl true
+  def start(_type, _args) do
+    children = [
+      # TUI process
+      {Ratatouille.Runtime.Supervisor, runtime: [app: Xest.TUI.TUI]}
+    ]
+
+    # See https://hexdocs.pm/elixir/Supervisor.html
+    # for other strategies and supported options
+    opts = [strategy: :one_for_one, name: Xest.TUI.Supervisor]
+    Supervisor.start_link(children, opts)
+  end
+end
diff --git a/apps/xest_tui/lib/xest/tui/tui.ex b/apps/xest_tui/lib/xest/tui/tui.ex
new file mode 100644
index 00000000..d929aad7
--- /dev/null
+++ b/apps/xest_tui/lib/xest/tui/tui.ex
@@ -0,0 +1,79 @@
+defmodule Xest.TUI.TUI do
+  @behaviour Ratatouille.App
+
+  alias Ratatouille.{EventManager, Window}
+  alias Ratatouille.Runtime.{Subscription, State}
+
+  require DateTime
+  import Ratatouille.View
+
+  alias Xest.BinanceExchange
+  alias Xest.Models
+
+  @impl true
+  def init(_context) do
+    {DateTime.utc_now(), 0, Xest.BinanceExchange.model(Xest.BinanceExchange)}
+  end
+
+  @impl true
+  def subscribe(_model) do
+    Subscription.interval(1_000, :tick)
+  end
+
+  @impl true
+  def update({now, counter, exchange}, msg) do
+    case msg do
+      {:event, %{ch: ?q}} ->
+        :ok = Window.close()
+
+      {:event, %{ch: ?+}} ->
+        {now, counter + 1, exchange}
+
+      {:event, %{ch: ?-}} ->
+        {now, counter - 1, exchange}
+
+      :tick ->
+        {DateTime.utc_now(), counter, exchange}
+
+      _ ->
+        IO.inspect(msg)
+        {now, counter, exchange}
+    end
+  end
+
+  # TODO : TUI design...
+
+  # Various windows:
+  # - HTTP requests (a nice log view)
+  # - websockets (a nice log view)
+  # - Events (from both rest polling and websockets, a debugging interface for commanded)
+  # - Exchange (model) State (from Events, but other untracked sources) - default view
+
+  @impl true
+  def render({now, counter, exchange}) do
+    view do
+      panel title: "Clock Example ('q' to quit)" do
+        label(content: "The time is: #{DateTime.to_string(now)}")
+      end
+
+      panel title: "Counter" do
+        label(content: "Counter is #{counter} (+/-)")
+      end
+
+      render_exchange(exchange)
+    end
+  end
+
+  defp render_exchange(%Models.Exchange{} = exchange) do
+    panel title: "Exchange" do
+      label(content: "code: #{exchange.status.code} ")
+      label(content: "status: #{exchange.status.message} ")
+    end
+  end
+
+  defp render_events() do
+  end
+
+  defp render_adapters() do
+  end
+end
diff --git a/apps/xest_tui/mix.exs b/apps/xest_tui/mix.exs
new file mode 100644
index 00000000..fc4f88fc
--- /dev/null
+++ b/apps/xest_tui/mix.exs
@@ -0,0 +1,36 @@
+defmodule Xest.TUI.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :xest_tui,
+      version: "0.1.0",
+      build_path: "../../_build",
+      config_path: "../../config/config.exs",
+      deps_path: "../../deps",
+      lockfile: "../../mix.lock",
+      elixir: "~> 1.11",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger],
+      mod: {Xest.TUI.Application, []}
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # TUI tooling
+      {:ratatouille, "~> 0.5.0"},
+      {:xest, in_umbrella: true}
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end
diff --git a/apps/xest_tui/test/test_helper.exs b/apps/xest_tui/test/test_helper.exs
new file mode 100644
index 00000000..869559e7
--- /dev/null
+++ b/apps/xest_tui/test/test_helper.exs
@@ -0,0 +1 @@
+ExUnit.start()
diff --git a/apps/xest_tui/test/xest/tui_test.exs b/apps/xest_tui/test/xest/tui_test.exs
new file mode 100644
index 00000000..6e6d4d77
--- /dev/null
+++ b/apps/xest_tui/test/xest/tui_test.exs
@@ -0,0 +1,8 @@
+defmodule Xest.TUITest do
+  use ExUnit.Case
+  doctest Xest.TUI
+
+  test "greets the world" do
+    assert Xest.TUI.hello() == :world
+  end
+end
diff --git a/config/config.exs b/config/config.exs
index a7b8d6e6..c831a86c 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -12,6 +12,9 @@ use Mix.Config
 config :xest_web,
   generators: [context_app: :xest]
 
+config :xest_tui,
+  generators: [context_app: :xest]
+
 # Configures the endpoint
 config :xest_web, XestWeb.Endpoint,
   url: [host: "localhost"],
diff --git a/config/dev.exs b/config/dev.exs
index f60b23dd..5a7719ea 100644
--- a/config/dev.exs
+++ b/config/dev.exs
@@ -68,7 +68,3 @@ config :phoenix, :stacktrace_depth, 20
 
 # clear screen when test_watch running again
 config :mix_test_watch, clear: true
-
-# to make sure we format before committing
-# TODO : add credo and coveralls
-config :pre_commit, commands: ["format"]