diff --git a/.gitmodules b/.gitmodules
index 3d24582..2348053 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "a2png"]
 	path = a2png
 	url = https://github.com/asciinema/a2png
+[submodule "vt"]
+	path = vt
+	url = https://github.com/asciinema/vt.git
diff --git a/Dockerfile b/Dockerfile
index f8173ee..8496d40 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,19 +13,16 @@ RUN apt-get update && \
     wget --quiet -O - https://packages.erlang-solutions.com/ubuntu/erlang_solutions.asc | apt-key add - && \
     apt-get update && \
     apt-get install -y \
-      autoconf \
       build-essential \
       elixir \
       esl-erlang \
       git-core \
       libfontconfig1 \
       libpq-dev \
-      libtool \
       libxml2-dev \
       libxslt1-dev \
       nginx \
       nodejs \
-      pkg-config \
       ruby2.1 \
       ruby2.1-dev \
       supervisor \
@@ -33,7 +30,6 @@ RUN apt-get update && \
       tzdata
 
 # Packages required for:
-#   autoconf, libtool and pkg-config for libtsm
 #   libfontconfig1 for PhantomJS
 #   ttf-bitstream-vera for a2png
 
@@ -56,18 +52,6 @@ RUN wget --quiet -O /opt/phantomjs.tar.bz2 https://bitbucket.org/ariya/phantomjs
     rm /opt/phantomjs.tar.bz2 && \
     ln -sf /opt/phantomjs-$PHANTOMJS_VERSION-linux-x86_64/bin/phantomjs /usr/local/bin
 
-# install libtsm
-
-RUN git clone https://github.com/asciinema/libtsm.git /tmp/libtsm && \
-    cd /tmp/libtsm && \
-    git checkout asciinema && \
-    test -f ./configure || NOCONFIGURE=1 ./autogen.sh && \
-    ./configure --prefix=/usr/local && \
-    make && \
-    make install && \
-    ldconfig && \
-    rm -rf /tmp/libtsm
-
 # install JDK
 
 RUN wget --quiet -O /opt/jdk-8u131-linux-x64.tar.gz --no-check-certificate --no-cookies --header 'Cookie: oraclelicense=accept-securebackup-cookie' http://download.oracle.com/otn-pub/java/jdk/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-x64.tar.gz && \
@@ -106,18 +90,19 @@ RUN cd a2png && npm install
 COPY a2png /app/a2png
 RUN cd a2png && lein cljsbuild once main && lein cljsbuild once page
 
+# build vt
+
+COPY vt/project.clj /app/vt/
+RUN cd vt && lein deps
+
+COPY vt /app/vt
+RUN cd vt && lein cljsbuild once main
+
 # service URLs
 
 ENV DATABASE_URL "postgresql://postgres@postgres/postgres"
 ENV REDIS_URL "redis://redis:6379"
 
-# compile terminal.c
-
-RUN mkdir -p /app/bin
-COPY src/Makefile /app/src/
-COPY src/terminal.c /app/src/
-RUN cd src && make
-
 # add Ruby source files
 
 COPY config/*.rb /app/config/
@@ -134,6 +119,7 @@ COPY vendor /app/vendor
 COPY config.ru /app/
 COPY Rakefile /app/
 COPY app /app/app
+COPY resources/welcome.json /app/resources/welcome.json
 
 # compile assets with assets pipeline
 
diff --git a/app/models/terminal.rb b/app/models/terminal.rb
index 9b0e408..82d52b3 100644
--- a/app/models/terminal.rb
+++ b/app/models/terminal.rb
@@ -2,29 +2,27 @@ require 'open3'
 
 class Terminal
 
-  BINARY_PATH = (Rails.root + "bin" + "terminal").to_s
+  SCRIPT_PATH = (Rails.root + "vt" + "main.js").to_s
 
   def initialize(width, height)
-    @process = Process.new("#{BINARY_PATH} #{width} #{height}")
+    @process = Process.new("node #{SCRIPT_PATH}")
+    send_cmd("new", { width: width, height: height })
   end
 
   def feed(data)
-    process.write("d\n#{data.bytesize}\n")
-    process.write(data)
+    send_cmd("feed-str", { str: data })
   end
 
-  def snapshot
-    process.write("p\n")
-    lines = Yajl::Parser.new.parse(process.read_line)
+  def screen
+    send_cmd("dump-screen")
+    screen = read_result
+    lines = screen.fetch("lines")
+    cursor = screen.fetch("cursor")
 
-    Snapshot.build(lines)
-  end
-
-  def cursor
-    process.write("c\n")
-    c = Yajl::Parser.new.parse(process.read_line)
-
-    Cursor.new(c['x'], c['y'], c['visible'])
+    {
+      snapshot: Snapshot.build(lines),
+      cursor: Cursor.new(cursor['x'], cursor['y'], cursor['visible'])
+    }
   end
 
   def release
@@ -33,6 +31,15 @@ class Terminal
 
   private
 
+  def send_cmd(cmd, data = {})
+    json = data.merge({ cmd: cmd }).to_json
+    process.write("#{json}\n")
+  end
+
+  def read_result()
+    Yajl::Parser.new.parse(process.read_line).fetch("result")
+  end
+
   attr_reader :process
 
   class Process
diff --git a/app/services/film.rb b/app/services/film.rb
index c4f6453..f6fc5c1 100644
--- a/app/services/film.rb
+++ b/app/services/film.rb
@@ -10,13 +10,14 @@ class Film
       terminal.feed(data)
     end
 
-    terminal.snapshot
+    terminal.screen[:snapshot]
   end
 
   def frames
     frames = stdout.lazy.map do |delay, data|
       terminal.feed(data)
-      [delay, Frame.new(terminal.snapshot, terminal.cursor)]
+      screen = terminal.screen
+      [delay, Frame.new(screen[:snapshot], screen[:cursor])]
     end
 
     FrameDiffList.new(frames)
diff --git a/spec/support/fakes.rb b/spec/support/fakes.rb
index d7ada01..b4a433e 100644
--- a/spec/support/fakes.rb
+++ b/spec/support/fakes.rb
@@ -8,12 +8,7 @@ class FakeTerminal
     @data << data
   end
 
-  def snapshot
-    @data
+  def screen
+    { snapshot: @data, cursor: @data.size }
   end
-
-  def cursor
-    @data.size
-  end
-
 end
diff --git a/src/.gitignore b/src/.gitignore
deleted file mode 100644
index 6cc474a..0000000
--- a/src/.gitignore
+++ /dev/null
@@ -1,2 +0,0 @@
-terminal
-*.o
diff --git a/src/Makefile b/src/Makefile
deleted file mode 100644
index ba9e89c..0000000
--- a/src/Makefile
+++ /dev/null
@@ -1,8 +0,0 @@
-all: ../bin/terminal
-
-../bin/terminal: terminal
-	mkdir -p ../bin
-	cp terminal ../bin/terminal
-
-terminal: terminal.c
-	gcc -O3 -o terminal terminal.c -ltsm
diff --git a/src/terminal.c b/src/terminal.c
deleted file mode 100644
index 5a687c1..0000000
--- a/src/terminal.c
+++ /dev/null
@@ -1,310 +0,0 @@
-#include <stdio.h>
-#include <libtsm.h>
-#include <string.h>
-
-#define READ_BUF_SIZE 16 * 1024
-
-static int RGB_LEVELS[6] = { 0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff };
-
-struct tsm_screen_attr last_attr;
-struct tsm_screen_attr *last_attr_ptr = &last_attr;
-
-
-static int u8_wc_to_utf8(char *dest, uint32_t ch) {
-    if (ch < 0x80) {
-        dest[0] = (char)ch;
-        return 1;
-    }
-
-    if (ch < 0x800) {
-        dest[0] = (ch >> 6) | 0xC0;
-        dest[1] = (ch & 0x3F) | 0x80;
-        return 2;
-    }
-
-    if (ch < 0x10000) {
-        dest[0] = (ch >> 12) | 0xE0;
-        dest[1] = ((ch >> 6) & 0x3F) | 0x80;
-        dest[2] = (ch & 0x3F) | 0x80;
-        return 3;
-    }
-
-    if (ch < 0x110000) {
-        dest[0] = (ch >> 18) | 0xF0;
-        dest[1] = ((ch >> 12) & 0x3F) | 0x80;
-        dest[2] = ((ch >> 6) & 0x3F) | 0x80;
-        dest[3] = (ch & 0x3F) | 0x80;
-        return 4;
-    }
-
-    return 0;
-}
-
-void check_err(int err, const char *message) {
-    if (err) {
-        printf("%s\n", message);
-        exit(1);
-    }
-}
-
-void write_cb(struct tsm_vte *vte, const char *u8, size_t len, void *data) {}
-
-int prepare_cb(struct tsm_screen *con, void *data) {
-    int *line = (int *)data;
-
-    *line = -1;
-    printf("[");
-
-    return 0;
-}
-
-void print_char(const uint32_t *ch) {
-    char str[5];
-    int size;
-
-    if (*ch == 0) {
-        printf(" ");
-    } else if (*ch == '"') {
-        printf("\\\"");
-    } else if (*ch == '\\') {
-        printf("\\\\");
-    } else {
-        size = u8_wc_to_utf8(str, *ch);
-        if (size > 0) {
-            str[size] = 0;
-            printf("%s", str);
-        } else {
-            printf("?");
-        }
-    }
-}
-
-int get_rgb_index(int value) {
-    int i;
-
-    for (i=0; i<6; i++) {
-        if (RGB_LEVELS[i] == value) return i;
-    }
-
-    return -1;
-}
-
-int get_rgb_color(int r, int g, int b) {
-    if (r == g && g == b && (r - 8) % 10 == 0) {
-        return 232 + (r - 8) / 10;
-    } else {
-        return 16 + get_rgb_index(r) * 36 + get_rgb_index(g) * 6 + get_rgb_index(b);
-    }
-}
-
-int get_fg(const struct tsm_screen_attr *attr) {
-    if (attr->fccode == -1) {
-        return get_rgb_color(attr->fr, attr->fg, attr->fb);
-    } else if (attr->fccode >= 0 && attr->fccode < 16) {
-        return attr->fccode;
-    } else {
-        return -1;
-    }
-}
-
-int get_bg(const struct tsm_screen_attr *attr) {
-    if (attr->bccode == -1) {
-        return get_rgb_color(attr->br, attr->bg, attr->bb);
-    } else if (attr->bccode >= 0 && attr->bccode < 16) {
-        return attr->bccode;
-    } else {
-        return -1;
-    }
-}
-
-void print_attr(const struct tsm_screen_attr *attr) {
-    bool comma_needed = false;
-    int color_code;
-
-    printf("{");
-
-    color_code = get_fg(attr);
-    if (color_code != -1) {
-        printf("\"fg\":%d", color_code);
-        comma_needed = true;
-    }
-
-    color_code = get_bg(attr);
-    if (color_code != -1) {
-        if (comma_needed) printf(",");
-        printf("\"bg\":%d", color_code);
-        comma_needed = true;
-    }
-
-    if (attr->bold) {
-        if (comma_needed) printf(",");
-        printf("\"bold\":true");
-        comma_needed = true;
-    }
-
-    if (attr->underline) {
-        if (comma_needed) printf(",");
-        printf("\"underline\":true");
-        comma_needed = true;
-    }
-
-    if (attr->inverse) {
-        if (comma_needed) printf(",");
-        printf("\"inverse\":true");
-        comma_needed = true;
-    }
-
-    if (attr->blink) {
-        if (comma_needed) printf(",");
-        printf("\"blink\":true");
-        comma_needed = true;
-    }
-
-    printf("}");
-}
-
-bool attr_eq(struct tsm_screen_attr *attr1, const struct tsm_screen_attr *attr2) {
-    return attr1->fccode == attr2->fccode &&
-        attr1->bccode == attr2->bccode &&
-        attr1->fr == attr2->fr &&
-        attr1->fg == attr2->fg &&
-        attr1->fb == attr2->fb &&
-        attr1->br == attr2->br &&
-        attr1->bg == attr2->bg &&
-        attr1->bb == attr2->bb &&
-        attr1->bold == attr2->bold &&
-        attr1->underline == attr2->underline &&
-        attr1->inverse == attr2->inverse &&
-        attr1->blink == attr2->blink;
-}
-
-void attr_cp(const struct tsm_screen_attr *src, struct tsm_screen_attr *dst) {
-    memcpy((void *)dst, (const void *)src, sizeof(last_attr));
-}
-
-void close_cell() {
-    printf("\",");
-    print_attr(last_attr_ptr);
-    printf("]");
-}
-
-void open_cell(const struct tsm_screen_attr *attr) {
-    printf("[\"");
-    attr_cp(attr, last_attr_ptr);
-}
-
-int draw_cb(struct tsm_screen *con, uint32_t id, const uint32_t *ch, size_t len,
-            unsigned int width, unsigned int posx, unsigned int posy,
-            const struct tsm_screen_attr *attr, tsm_age_t age, void *data) {
-
-    int *line = (int *)data;
-
-    if (((signed int)posy) > *line) {
-        if (*line >= 0) {
-            close_cell();
-            printf("],"); // close line
-        }
-        printf("["); // open line
-        open_cell(attr);
-    }
-
-    *line = posy;
-
-    if (width == 0) return 0;
-
-    if (!(attr_eq(last_attr_ptr, attr))) {
-        close_cell();
-        printf(",");
-        open_cell(attr);
-    }
-
-    print_char(ch);
-
-    return 0;
-}
-
-int render_cb(struct tsm_screen *con, void *data) {
-    int *line = (int *)data;
-
-    if (*line >= 0) {
-        close_cell();
-        printf("]"); // close line
-    }
-
-    printf("]\n");
-
-    return 0;
-}
-
-int main(int argc, char *argv[]) {
-    int err;
-    int i;
-    struct tsm_screen *screen;
-    struct tsm_vte *vte;
-    int width, height;
-    char *line = NULL;
-    size_t size;
-    unsigned int n;
-    char *buffer = (char *) malloc(READ_BUF_SIZE);
-    int line_n, cursor_x, cursor_y;
-    char *cursor_visible;
-    unsigned int flags;
-    int m, read;
-
-    width = atoi(argv[1]);
-    height = atoi(argv[2]);
-
-    err = tsm_screen_new(&screen, NULL, NULL);
-    check_err(err, "can't create screen");
-
-    err = tsm_screen_resize(screen, width, height);
-    check_err(err, "can't resize screen");
-
-    err = tsm_vte_new(&vte, screen, write_cb, NULL, NULL, NULL);
-    check_err(err, "can't create vte");
-
-    for (;;) {
-        if (getline(&line, &size, stdin) == -1) break;
-
-        char action = line[0];
-
-        switch(action) {
-            case 'd':
-                if (getline(&line, &size, stdin) == -1) break;
-                n = atoi(line);
-                while (n > 0) {
-                    if (n > READ_BUF_SIZE) {
-                        m = READ_BUF_SIZE;
-                    } else {
-                        m = n;
-                    }
-                    read = fread(buffer, 1, m, stdin);
-                    tsm_vte_input(vte, buffer, read);
-                    n = n - read;
-                }
-                break;
-            case 'p':
-                //tsm_screen_draw(screen, prepare_cb, draw_cb, render_cb, &line_n);
-                prepare_cb(screen, &line_n);
-                tsm_screen_draw(screen, draw_cb, &line_n);
-                render_cb(screen, &line_n);
-                break;
-            case 'c':
-                cursor_x = tsm_screen_get_cursor_x(screen);
-                cursor_y = tsm_screen_get_cursor_y(screen);
-                flags = tsm_screen_get_flags(screen);
-                if (!(flags & TSM_SCREEN_HIDE_CURSOR)) {
-                    cursor_visible = "true";
-                } else {
-                    cursor_visible = "false";
-                }
-                printf("{\"x\":%d,\"y\":%d,\"visible\":%s}\n", cursor_x, cursor_y, cursor_visible);
-
-                break;
-        }
-
-        fflush(stdout);
-    }
-
-    return 0;
-}
diff --git a/vt b/vt
new file mode 160000
index 0000000..5fde1d8
--- /dev/null
+++ b/vt
@@ -0,0 +1 @@
+Subproject commit 5fde1d8cb8306d09034709ae5901d7f7b43630cc