diff --git a/autoload/vital/__vital__/Experimental/UI/Popup.vim b/autoload/vital/__vital__/Experimental/UI/Popup.vim
new file mode 100644
index 000000000..1943c4dbb
--- /dev/null
+++ b/autoload/vital/__vital__/Experimental/UI/Popup.vim
@@ -0,0 +1,216 @@
+let s:save_cpo = &cpo
+set cpo&vim
+
+let s:_has_nvim = has('nvim')
+let s:_popups = {}
+let s:_id = 0
+
+function! s:is_supported() abort
+  return has('nvim') && exists('*nvim_open_win') || (!has('nvim') && exists('*popup_create') && has('patch-8.2.0286'))
+endfunction
+
+" opt = {
+"   'contents': ['This', 'is', 'a', 'line'],
+"   'w': 5,
+"   'h': 5,
+"   'x': 1,
+"   'y': 1,
+"   'pos': 'topleft|topright|bottomleft|bottomright|topcenter|bottomcenter',
+" }
+function! s:create(opt) abort
+  let id = s:_nextid()
+  let data = { 'winid': 0 }
+
+  call s:_set(data, a:opt)
+
+  if s:_has_nvim
+    let data['bufnr'] = nvim_create_buf(0, 1)
+    call nvim_buf_set_lines(data['bufnr'], 0, -1, 1, data['contents'])
+    let data['winid'] = s:_nvim_open_win(data)
+  else
+    " neovim doesn't support scrollbar so don't enable it
+    let data['winid'] = popup_create(data['contents'], s:_get_vim_options(data))
+    let data['bufnr'] = winbufnr(data['winid'])
+  endif
+  let s:_popups[id] = data
+  call s:_notify(id, {}, 'create')
+  call s:_notify(id, {}, 'show')
+  return id
+endfunction
+
+function! s:close(id) abort
+  let data = s:_popups[a:id]
+  if s:_has_nvim
+    call nvim_win_close(data['winid'], 1)
+    let data['winid'] = 0
+  else
+    call popup_close(data['winid'])
+  endif
+  call s:_notify(a:id, {}, 'close')
+  call remove(s:_popups, a:id)
+endfunction
+
+function! s:hide(id) abort
+  let data = s:_popups[a:id]
+  if s:_has_nvim
+    call nvim_win_close(data['winid'], 1)
+    let data['winid'] = 0
+  else
+    call popup_hide(data['winid'])
+  endif
+  call s:_notify(a:id, {}, 'hide')
+endfunction
+
+function! s:show(id) abort
+  let data = s:_popups[a:id]
+  if s:_has_nvim
+    let data['winid'] = s:_nvim_open_win(data)
+  else
+    call popup_show(data['winid'])
+  endif
+  call s:_notify(a:id, {}, 'show')
+endfunction
+
+function! s:contents(id, contents) abort
+  let data = s:_popups[a:id]
+  let data['contents'] = a:contents
+  if s:_has_nvim
+    call nvim_buf_set_lines(data['bufnr'], 0, -1, 1, a:contents)
+  else
+    call popup_settext(data['winid'], a:contents)
+  endif
+endfunction
+
+function! s:options(id, opt) abort
+  let data = s:_popups[a:id]
+  call s:_set(data, a:opt)
+  if s:_has_nvim
+    call nvim_win_set_config(data['winid'], s:_get_nvim_options(data))
+  else
+    call popup_setoptions(data['winid'], s:_get_vim_options(data))
+  endif
+  call s:_notify(a:id, {}, 'options')
+endfunction
+
+function! s:winid(id) abort
+  " can return 0 when hidden for neovim
+  return s:_popups[a:id]['winid']
+endfunction
+
+function! s:bufnr(id) abort
+  return s:_popups[a:id]['bufnr']
+endfunction
+
+function! s:_get_vim_options(data) abort
+  return {
+    \ 'width': a:data['w'],
+    \ 'height': a:data['h'],
+    \ 'minwidth': a:data['w'],
+    \ 'minheight': a:data['h'],
+    \ 'maxwidth': a:data['w'],
+    \ 'maxheight': a:data['h'],
+    \ 'col': a:data['sx'],
+    \ 'line': a:data['sy'],
+    \ 'scrollbar': 0,
+    \ 'wrap': 0,
+    \ }
+endfunction
+
+function! s:_get_nvim_options(data) abort
+  return {
+    \ 'relative': 'editor',
+    \ 'style': 'minimal',
+    \ 'width': a:data['w'],
+    \ 'height': a:data['h'],
+    \ 'col': a:data['sx'],
+    \ 'row': a:data['sy'],
+    \ 'focusable': 0,
+    \ }
+endfunction
+
+function! s:_nvim_open_win(data) abort
+  return nvim_open_win(a:data['bufnr'], 0, s:_get_nvim_options(a:data))
+endfunction
+
+function! s:_user_to_editor_xy(val) abort
+  if s:_has_nvim
+    return a:val - 1
+  else
+    return a:val
+  endif
+endfunction
+
+function! s:_editor_to_user_xy(val) abort
+  if s:_has_nvim
+    return a:val + 1
+  else
+    return a:val
+  endif
+endfunction
+
+function! s:_set(data, opt) abort
+  " copy all callbacks to data
+  for [key, Cb] in items(a:opt)
+    if stridx(key, 'on_') == 0
+      let a:data[key] = Cb
+    endif
+  endfor
+
+  " try to set values from a:opt, if not set from a:data, if not default
+  let a:data['w'] = get(a:opt, 'w', get(a:data, 'w', 5))
+  let a:data['h'] = get(a:opt, 'h', get(a:data, 'h', 5))
+
+  if s:_has_nvim
+    " a:opt[x/y] need to normalize
+    " a:data['x/y'] already normalized
+    let a:data['x'] = has_key(a:opt, 'x') ? s:_user_to_editor_xy(a:opt['x']) : get(a:data, 'x', 0)
+    let a:data['y'] = has_key(a:opt, 'y') ? s:_user_to_editor_xy(a:opt['y']) : get(a:data, 'y', 0)
+  else
+    let a:data['x'] = get(a:opt, 'x', get(a:data, 'x', 1))
+    let a:data['y'] = get(a:opt, 'y', get(a:data, 'y', 1))
+  endif
+
+  let a:data['contents'] = get(a:opt, 'contents', get(a:data, 'contents', []))
+  let a:data['pos'] = get(a:opt, 'pos', get(a:data, 'pos', 'topleft'))
+
+  if a:data['pos'] ==# 'topleft'
+    let a:data['sx'] = a:data['x']
+    let a:data['sy'] = a:data['y']
+  elseif a:data['pos'] ==# 'topright'
+    let a:data['sx'] = a:data['x'] + a:data['w'] + 1
+    let a:data['sy'] = a:data['y']
+  elseif a:data['pos'] ==# 'bottomleft'
+    let a:data['sx'] = a:data['x']
+    let a:data['sy'] = a:data['y'] - a:data['h'] + 1
+  elseif a:data['pos'] ==# 'bottomright'
+    let a:data['sx'] = a:data['x'] + a:data['w'] + 1
+    let a:data['sy'] = a:data['y'] - a:data['h'] + 1
+  elseif a:data['pos'] ==# 'topcenter'
+    let a:data['sx'] = a:data['x'] + float2nr(a:data['x'] / 2) + 1
+    let a:data['sy'] = a:data['y'] - a:data['h']
+  elseif a:data['pos'] ==# 'bottomcenter'
+    let a:data['sx'] = a:data['x'] + float2nr(a:data['x'] / 2) + 1
+    let a:data['sy'] = a:data['y'] + 1
+  else
+    throw 'vital: Experimental.UI.Popup: Invalid pos'
+  endif
+endfunction
+
+function! s:_nextid() abort
+  let s:_id += 1
+  return s:_id
+endfunction
+
+function! s:_notify(id, data, event) abort
+  if has_key(s:_popups[a:id], 'on_event')
+    call s:_popups[a:id]['on_event'](a:id, a:data, a:event)
+  endif
+  let eventhandler = 'on_' . a:event
+  if has_key(s:_popups[a:id], eventhandler)
+    call s:_popups[a:id][eventhandler](a:id, a:data, a:event)
+  endif
+endfunction
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+"vim: sts=2 sw=2 smarttab et ai textwidth=0 fdm=marker