diff --git a/Gemfile b/Gemfile
index b9a3950..fb12547 100644
--- a/Gemfile
+++ b/Gemfile
@@ -59,7 +59,6 @@ gem "pandoc-ruby"
 gem "prawn-markup"
 gem "prawn-rails"
 gem "sablon"
-gem "ransack"
 gem "slim"
 
 group :development, :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index 18ac919..975d209 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -258,10 +258,6 @@ GEM
       zeitwerk (~> 2.6)
     rainbow (3.1.1)
     rake (13.2.1)
-    ransack (4.2.1)
-      activerecord (>= 6.1.5)
-      activesupport (>= 6.1.5)
-      i18n
     rbs (3.5.2)
       logger
     rdoc (6.7.0)
@@ -400,7 +396,6 @@ DEPENDENCIES
   prawn-rails
   puma (>= 5.0)
   rails (~> 7.2)
-  ransack
   rubocop
   rubocop-capybara
   rubocop-rails
diff --git a/app/controllers/checks_controller.rb b/app/controllers/checks_controller.rb
index 4b8669a..1a36575 100644
--- a/app/controllers/checks_controller.rb
+++ b/app/controllers/checks_controller.rb
@@ -5,11 +5,7 @@ class ChecksController < ApplicationController
 
   # GET /checks or /checks.json
   def index
-    @pagy, @checks = if filter_params[:s]
-      pagy(Check.search(filter_params[:s]).order(:conformity_level))
-    else
-      pagy(Check.all.order(:conformity_level))
-    end
+    @pagy, @checks = pagy(Check.filter_by(filter_params).order(:conformity_level))
   end
 
   # GET /checks/1 or /checks/1.json
@@ -71,7 +67,7 @@ class ChecksController < ApplicationController
   end
 
   def filter_params
-    @filter_params ||= params.permit(filter: %i[s level])[:filter] || {}
+    @filter_params ||= params.permit(filter: [ :s, priority: [], conformity_level: [], standard_ids: [], principle_id: [] ])[:filter] || {}
   end
 
   private
diff --git a/app/lib/link_checker.rb b/app/lib/link_checker.rb
index 7480316..ce52940 100644
--- a/app/lib/link_checker.rb
+++ b/app/lib/link_checker.rb
@@ -7,7 +7,6 @@ module LinkChecker
 
   def http(input)
     response = Net::HTTP.get_response(URI.parse(input), { 'User-Agent': UA })
-    # debugger
     case response
     when Net::HTTPSuccess
       response.uri
diff --git a/app/models/check.rb b/app/models/check.rb
index 812ee87..d819d2b 100644
--- a/app/models/check.rb
+++ b/app/models/check.rb
@@ -52,12 +52,35 @@ class Check < ApplicationRecord
                         :standard_text,
                         :powerpoint_text
 
-  after_create { update(number: id) }
+  after_create { update(number: id) unless number }
 
-  scope(:search, lambda do |term|
+  scope(:search, lambda { |term|
     # TODO: Search only fields for current locale.
-    joins("INNER JOIN action_text_rich_texts ON action_text_rich_texts.record_id = checks.id AND record_type = 'Check'").where("checks.name_de LIKE :term OR checks.name_de LIKE :term OR action_text_rich_texts.body LIKE :term", term: "%#{term}%").distinct
-  end)
+    joined = joins("INNER JOIN action_text_rich_texts ON action_text_rich_texts.record_id = checks.id AND record_type = 'Check'")
+    if term.to_i > 0
+      joined.where("checks.name_de LIKE :term OR checks.name_de LIKE :term OR checks.number = :number OR action_text_rich_texts.body LIKE :term", term: "%#{term}%", number: term.to_i).distinct
+    else
+      joined.where("checks.name_de LIKE :term OR checks.name_de LIKE :term OR action_text_rich_texts.body LIKE :term", term: "%#{term}%").distinct
+    end
+  })
+
+  scope(:filter_by, lambda { |filter|
+    relation = where(nil)
+    filter.slice(:s, :principle_id, :priorities, :standard_ids, :conformity_level).each do |key, value|
+      next unless value.present?
+
+      case key
+      when "s"
+        relation = relation.search(value)
+      when "standard_ids"
+        relation = relation.joins(:standards).where(standards: { id: value })
+      else
+        relation = relation.where(key => value)
+      end
+    end
+
+    relation
+  })
 
   def self.ransackable_attributes(auth_object = nil)
     [ "applicable_to_app", "applicable_to_web", "auditory", "cognitive", "conformity_level", "created_at", "external_number", "external_url", "id", "level", "manual_test", "name", "name_de", "name_en", "number", "physical", "position", "principle_id", "priority", "test_url", "updated_at", "visual" ]
diff --git a/app/views/checks/index.html.slim b/app/views/checks/index.html.slim
index b21cd0e..4c15fa8 100644
--- a/app/views/checks/index.html.slim
+++ b/app/views/checks/index.html.slim
@@ -11,14 +11,35 @@ h1
         = f.check_box :principle_id_in, checked: @q[:principle_id_in].include?(principle.id), label: principle.name_de, id: "principle_id_in_#{principle.id}"
   = f.submit
 
-= bootstrap_form_with(url: checks_path(page: params[:page]), method: :get, scope: :filter) do |form|
-  = form.hidden_field :page, value: params[:page] if params[:page]
-  .row
-    .col-md-3
-      = form.text_field(:s, placeholder: "suchen...", hide_label: true, value: filter_params[:s])
-    .col
-      = form.submit name: "", value: "Suchen"
-      = link_to "Filter löschen", checks_path, class: "btn btn-outline-secondary ms-3" if filter_params[:s]
+.card.mb-3
+  .card-header.d-flex data-bs-toggle="collapse" href="#filter-form" role="button" aria-expanded="#{filter_params.present?}" aria-controler="filter-form"
+    ' Filter
+  .card-body.collapse id="filter-form" class="#{"show" if filter_params.present?}"
+    = bootstrap_form_with(url: checks_path, method: :get, scope: :filter) do |form|
+      = form.hidden_field :page, value: params[:page] if params[:page]
+      .row
+        .col-lg-5
+          = form.text_field(:s, placeholder: "suchen...", hide_label: true, value: filter_params[:s])
+        .col-lg-2 
+          - Principle.all.sort_by(&:name_de).each do |principle|
+            .form-check.form-check-inline
+              = form.check_box :principle_id, { label: principle.t_name, multiple: true, checked: (filter_params[:principle_id] || []).include?(principle.id.to_s) }, principle.id, nil
+        .col-lg-2 
+          - Standard.all.sort_by(&:name_de).each do |standard|
+            .form-check.form-check-inline
+              = form.check_box :standard_ids, { label: standard.t_name, multiple: true, checked: (filter_params[:standard_ids] || []).include?(standard.id.to_s) }, standard.id, nil
+        .col-lg-1  
+          - Check.conformity_levels.each do |conformity_level, value|
+            .form-check.form-check-inline
+              = form.check_box :conformity_level, { label: conformity_level, multiple: true, checked: (filter_params[:conformity_level] || []).include?(value.to_s) }, value, nil
+        .col-lg-2 
+          - Check.priorities.each do |priority, value|
+            .form-check.form-check-inline
+              = form.check_box :priority, { label: t("priority.#{priority}"), multiple: true, checked: (filter_params[:priority] || []).include?(value.to_s) }, value, nil
+      .row 
+        .col
+          = form.submit name: "", value: "Filtern"
+          = link_to "Filter löschen", checks_path, class: "btn btn-outline-secondary ms-3", data: { turbo_prefetch: false } if filter_params.keys.any?
 table.table.table-striped
   thead
     tr