diff --git a/.CI/ReSim/prepare_pr.sh b/.CI/ReSim/prepare_pr.sh
new file mode 100755
index 0000000000..c2bb77c958
--- /dev/null
+++ b/.CI/ReSim/prepare_pr.sh
@@ -0,0 +1,7 @@
+event_number=$1
+# checkout the pull request
+docker run --name compile_msl --rm --volume shared_data:/shared_data wsm_image /shared_data/run_scripts/git_pr_pull.sh $event_number
+# compile msl binaries
+docker run --name compile_msl --rm --volume shared_data:/shared_data wsm_image /shared_data/run_scripts/compile_msl.sh /shared_data/repos/pr_testing/ModelicaStandardLibrary
+# delete old PRs with same number (in case of a new commit on a PR)
+docker run --name compile_msl --rm --volume shared_data:/shared_data dymola_image /shared_data/run_scripts/delete_old_PRs.sh  $event_number    
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diff --git a/.CI/ReSim/run_pr.sh b/.CI/ReSim/run_pr.sh
new file mode 100755
index 0000000000..13ad39ee04
--- /dev/null
+++ b/.CI/ReSim/run_pr.sh
@@ -0,0 +1,33 @@
+event_number=$1
+master_hash=$2
+pkg_name=$3
+
+# Run Modelica in all tools
+tools=$4
+
+for tool in $tools
+do 
+  uppertool=$( echo $tool | tr 'a-z' 'A-Z')
+  docker run --rm --name $tool\_pr_compare_$event_number\_$pkg_name --volume shared_data:/shared_data  $tool\_image python /shared_data/run_scripts/$uppertool\_PR_compare.py $master_hash $event_number $pkg_name            
+done
+
+#docker run --rm --name dymola_pr_compare_$event_number\_$pkg_name --volume shared_data:/shared_data  dymola_image python /shared_data/run_scripts/Dymola_PR_compare.py $master_hash $event_number $pkg_name          
+#docker run --rm --name om_pr_compare_$event_number\_$pkg_name     --volume shared_data:/shared_data      om_image python /shared_data/run_scripts/OM_PR_compare.py     $master_hash $event_number $pkg_name
+#docker run --rm --name wsm_pr_compare_$event_number\_$pkg_name    --volume shared_data:/shared_data     wsm_image python /shared_data/run_scripts/WSM_PR_compare.py    $master_hash $event_number $pkg_name
+
+# create an overview over all tools
+docker run --name create_overview_$event_number\_$pkg_name --volume shared_data:/shared_data om_image python /shared_data/run_scripts/overview_report.py $event_number $pkg_name
+
+# clear published directory (web server)
+if [ -d "/var/www/html/prs/$event_number/$pkg_name" ]; then
+  rm -rf "/var/www/html/prs/$event_number/$pkg_name"
+fi
+if [ ! -d "/var/www/html/prs/$event_number" ]; then
+    mkdir /var/www/html/prs/$event_number
+fi
+mkdir /var/www/html/prs/$event_number/$pkg_name
+
+# copy data to webserver directory
+docker cp create_overview_$event_number\_$pkg_name:/shared_data/resim_output/PRs/PR_$event_number/$pkg_name/report  /var/www/html/prs/$event_number/$pkg_name
+docker rm create_overview_$event_number\_$pkg_name
+exit $(head -n 1 /var/www/html/prs/$event_number/$pkg_name/report/status.txt)  
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diff --git a/.github/workflows/ReSim_CI.yml b/.github/workflows/ReSim_CI.yml
new file mode 100644
index 0000000000..fa5dd01425
--- /dev/null
+++ b/.github/workflows/ReSim_CI.yml
@@ -0,0 +1,43 @@
+name: CI ReSim
+
+on:
+  pull_request_target:
+  workflow_dispatch:
+
+env:
+    PR_SERVER: ${{ vars.LTX_PR_SERVER }}
+    TESTING_TOOLS: ${{ vars.LTX_TESTING_TOOLS }}
+    EVENT_NUMBER:  ${{ github.event.number }}
+    PR_SHA: ${{ github.event.pull_request.base.sha }}
+
+jobs:
+  prepare:
+    runs-on: [ self-hosted, Linux, regression_testing ]      
+    steps: 
+      - uses: actions/checkout@v6
+        with: 
+            sparse-checkout: './.CI/ReSim'
+
+      - name: Checkout code in docker
+        run: ./.CI/ReSim/prepare_pr.sh ${{ env.EVENT_NUMBER }}
+    
+  testrun_modelica:
+    needs: prepare
+    runs-on: [ self-hosted, Linux, regression_testing ]
+    environment: 
+        name: Report modelica
+        url: ${{ env.PR_SERVER }}/${{ env.EVENT_NUMBER }}/Modelica/report/PR_comparison_report.html
+    steps:
+      - name: Run tests modelica      
+        run: ./.CI/ReSim/run_pr.sh ${{ env.EVENT_NUMBER }} ${{ env.PR_SHA }} Modelica ${{ env.TESTING_TOOLS }}
+
+            
+  testrun_modelicatest:
+    needs: prepare
+    runs-on: [ self-hosted, Linux, regression_testing ]
+    environment: 
+        name: Report modelicatest
+        url: ${{ env.PR_SERVER }}/${{ env.EVENT_NUMBER }}/ModelicaTest/report/PR_comparison_report.html
+    steps:    
+      - name: Run tests modelicatest      
+        run:  ./.CI/ReSim/run_pr.sh ${{ env.EVENT_NUMBER }} ${{ env.PR_SHA }} ModelicaTest ${{ env.TESTING_TOOLS }}
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