diff --git a/src/Layout/Routes.js b/src/Layout/Routes.js
index c7d9880d..4f645908 100644
--- a/src/Layout/Routes.js
+++ b/src/Layout/Routes.js
@@ -10,6 +10,7 @@ import DashboardRoute from "pages/DashboardRoute";
 import Desktop from "pages/Desktop";
 import DialeqtImport from "pages/DialeqtImport";
 import DictImport from "pages/DictImport";
+import ComplexDistance from "pages/ComplexDistance";
 import CorpImport from "pages/CorpImport";
 import DictionariesAll from "pages/DictionariesAll";
 import DistanceMap from "pages/DistanceMap";
@@ -17,7 +18,6 @@ import MapSelectedLanguages from "pages/DistanceMap/map";
 import SelectedLanguages from "pages/DistanceMap/selectorLangGroup";
 import Docx2Eaf from "pages/Docx2Eaf";
 import Docx2Xlsx from "pages/Docx2Xlsx";
-import ListCognates from "pages/ListCognates";
 import EditTranslations from "pages/EditTranslations";
 import Files from "pages/Files";
 import Grants from "pages/Grants";
@@ -25,6 +25,7 @@ import GrantsRoute from "pages/GrantsRoute";
 import Info from "pages/Info";
 import Languages from "pages/Languages";
 import LanguagesDatabasesRoute from "pages/LanguagesDatabasesRoute";
+import ListCognates from "pages/ListCognates";
 import Map from "pages/Map";
 import NotFound from "pages/NotFound";
 import Organizations from "pages/Organizations";
@@ -81,6 +82,7 @@ const AppRoutes = () => (
     <Route path="/valency" element={<Valency />} />
     <Route path="/adverb" element={<Adverb />} />
     <Route path="/list_cognates" element={<ListCognates />} />
+    <Route path="/complex_distance" element={<ComplexDistance />} />
     <Route element={<NotFound />} />
   </Routes>
 );
diff --git a/src/components/CognateAnalysisModal/index.js b/src/components/CognateAnalysisModal/index.js
index c83b1c57..fc8d5917 100644
--- a/src/components/CognateAnalysisModal/index.js
+++ b/src/components/CognateAnalysisModal/index.js
@@ -176,6 +176,7 @@ const computeCognateAnalysisMutation = gql`
       translation_count
       result
       xlsx_url
+      json_url
       figure_url
       minimum_spanning_tree
       embedding_2d
@@ -208,6 +209,7 @@ const computeSwadeshAnalysisMutation = gql`
       transcription_count
       result
       xlsx_url
+      json_url
       minimum_spanning_tree
       embedding_2d
       embedding_3d
@@ -236,6 +238,7 @@ const computeMorphCognateAnalysisMutation = gql`
       transcription_count
       result
       xlsx_url
+      json_url
       minimum_spanning_tree
       embedding_2d
       embedding_3d
@@ -1260,6 +1263,7 @@ class CognateAnalysisModal extends React.Component {
 
       result: null,
       xlsx_url: "",
+      json_url: "",
       figure_url: "",
 
       minimum_spanning_tree: [],
@@ -2118,11 +2122,12 @@ class CognateAnalysisModal extends React.Component {
       for (const language of this.state.language_list) {
         let p_count = 0;
 
-        for (const { perspective } of language.perspective_list) {
+        for (const { perspective, treePathList: [subLanguage,] } of language.perspective_list) {
           const p_key = id2str(perspective.id);
 
           if (this.state.perspectiveSelectionMap[p_key]) {
             perspectiveInfoList.push([
+              subLanguage.__typename === "Language" ? subLanguage.id : this.baseLanguageId,
               perspective.id,
               this.fieldDict[this.state.transcriptionFieldIdStrMap[p_key]].id,
               this.fieldDict[this.state.translationFieldIdStrMap[p_key]].id,
@@ -2138,7 +2143,8 @@ class CognateAnalysisModal extends React.Component {
     } else {
       perspectiveInfoList = this.perspective_list
 
-        .map(({ perspective }, index) => [
+        .map(({ perspective, treePathList: [subLanguage,] }, index) => [
+          subLanguage.__typename === "Language" ? subLanguage.id : this.baseLanguageId,
           perspective.id,
           this.fieldDict[this.state.transcriptionFieldIdStrList[index]].id,
           this.fieldDict[this.state.translationFieldIdStrList[index]].id,
@@ -2798,9 +2804,28 @@ class CognateAnalysisModal extends React.Component {
 
     const { language_list, perspectiveSelectionCountMap } = this.state;
 
+    const disabledCompute = (
+      (!multi && (this.perspective_list.length <= 1 ||
+        !this.state.perspectiveSelectionList.some(enabled => enabled))) ||
+      (multi &&
+        (language_list.length <= 0 ||
+          (mode === "multi_reconstruction" &&
+            language_list.filter(language => perspectiveSelectionCountMap[id2str(language.id)] > 0).length <=
+              1) ||
+          perspectiveSelectionCountMap[""] <= 0)) ||
+      this.state.computing
+    )
+
     return (
       <div>
-        <Modal closeIcon onClose={this.props.closeModal} dimmer open size="fullscreen" className="lingvo-modal2">
+        <Modal
+          onKeyDown = { e => {
+            if (e.key === 'Enter' && !disabledCompute) this.handleCreate(); }}
+          tabIndex = "0"
+          closeIcon
+          onClose={this.props.closeModal}
+          dimmer open
+          size="fullscreen" className="lingvo-modal2">
           <Modal.Header>
             {mode === "acoustic"
               ? this.context("Cognate acoustic analysis")
@@ -2839,18 +2864,7 @@ class CognateAnalysisModal extends React.Component {
                 )
               }
               onClick={this.handleCreate}
-              disabled={
-                (!multi &&
-                  (this.perspective_list.length <= 1 ||
-                    !this.state.perspectiveSelectionList.some(enabled => enabled))) ||
-                (multi &&
-                  (language_list.length <= 0 ||
-                    (mode === "multi_reconstruction" &&
-                      language_list.filter(language => perspectiveSelectionCountMap[id2str(language.id)] > 0).length <=
-                        1) ||
-                    perspectiveSelectionCountMap[""] <= 0)) ||
-                this.state.computing
-              }
+              disabled={disabledCompute}
               className="lingvo-button-violet"
             />
             <Button
@@ -2890,6 +2904,8 @@ class CognateAnalysisModal extends React.Component {
                 {this.state.result.length > 0 && mode !== "suggestions" && mode !== "multi_suggestions" && (
                   <div className="lingvo-cognate-text" style={{ paddingTop: "6px", paddingBottom: "3px" }}>
                     <a href={this.state.xlsx_url}>{this.context("XLSX-exported analysis results")}</a>
+                    <p/>
+                    <a href={this.state.json_url}>{this.context("JSON-exported analysis results")}</a>
                   </div>
                 )}
 
diff --git a/src/pages/ComplexDistance/index.js b/src/pages/ComplexDistance/index.js
new file mode 100644
index 00000000..3693338c
--- /dev/null
+++ b/src/pages/ComplexDistance/index.js
@@ -0,0 +1,149 @@
+import { connect } from "react-redux";
+import { Button, Dimmer, Icon, Input, Label, Loader, Message, Segment } from "semantic-ui-react";
+import { gql, useMutation } from "@apollo/client";
+import React, { useContext, useState, useEffect } from "react";
+
+import "./style.scss";
+
+import TranslationContext from "Layout/TranslationContext";
+
+const complexDistanceMutation = gql`
+  mutation complexDistance (
+    $resultPool: [ObjectVal]!
+    $debugFlag: Boolean
+  ) {
+    complex_distance(
+      result_pool: $resultPool
+      debug_flag: $debugFlag
+    ) {
+      result
+      minimum_spanning_tree
+      embedding_2d
+      embedding_3d
+      language_name_list
+      message
+      triumph
+    }
+  }
+`;
+
+const ComplexDistance = connect(state => state.user)(({user}) => {
+
+  const [cleanResult, setCleanResult] = useState(false);
+  const [fileSuite, setFileSuite] = useState(null);
+  const [getComplexDistance, { data, error, loading }] = useMutation(complexDistanceMutation);
+
+  useEffect(() => setCleanResult(false), [loading, data]);
+  const getTranslation = useContext(TranslationContext);
+
+  const debugFlag = false;
+
+  const runMutation = () => {
+
+    if (loading)
+      return;
+
+    const resultPool = new Array(fileSuite.length);
+
+    for (const [index, file] of fileSuite.entries()) {
+      const reader = new FileReader();
+      reader.onload = () => {
+        resultPool[index] = JSON.parse(reader.result);
+        if ((index + 1) == fileSuite.length) {
+          getComplexDistance(
+            { variables:
+              {
+                resultPool,
+                debugFlag
+              }
+            }
+          );
+        }
+      };
+      reader.readAsText(file);
+    }
+  }
+
+  return (
+    <div className="background-content">
+    {(user.id === undefined) && !loading ? (
+      <Message>
+        <Message.Header>{getTranslation("Please sign in")}</Message.Header>
+        <p>{getTranslation("This page is available for registered users only")}</p>
+      </Message>
+    ) : loading ? (
+      <Segment>
+        <Loader active inline="centered" indeterminate>
+          {getTranslation("Loading")}...
+        </Loader>
+      </Segment>
+    ) : (
+      <Segment onKeyDown = {(e) => { if (e.key === 'Enter') document.getElementById("get-result").click(); }} tabIndex="0">
+        <span>
+          { getTranslation(
+              fileSuite ? "Json file(s) for complex result:" : "Please select result file(s) for calculating."
+          )}
+        </span>
+
+        { fileSuite && fileSuite.map(({ name: fileName }) => (
+          <Label style={{ margin: "0.5em" }}>
+            <Icon name="file outline" />
+              { fileName }
+          </Label>
+        ))}
+
+        <Button style={{ marginLeft: "1em" }} onClick={() => document.getElementById("file-select").click()}>
+          {`${getTranslation("Browse")}...`}
+        </Button>
+
+        <Input
+          id="file-select"
+          type="file"
+          multiple
+          style={{ display: "none" }}
+          onChange={e => setFileSuite(Array.from(e.target.files))}
+        />
+        <p/>
+        <Button
+          color={fileSuite ? "green" : "gray"}
+          id="get-result"
+          disabled={!fileSuite}
+          content={getTranslation("Get complex distance")}
+          onClick={runMutation}
+        />
+        { error && !cleanResult && (
+          <Message negative>
+            <Message.Header>{getTranslation("Request error")}</Message.Header>
+            <p>
+              <span>{getTranslation("Please contact developers at")} </span>
+              <a href="https://t.me/lingvodoc_support" target="_blank" rel="noreferrer">
+                {getTranslation("Support@Telegram")}
+              </a>
+              <span> {getTranslation("or at")} </span>
+              <a href="https://github.com/ispras/lingvodoc-react/issues">{getTranslation("Lingvodoc Github")}</a>
+              <span>.</span>
+            </p>
+            <p> {error.message} </p>
+          </Message>
+        )}
+        { data && !data.complex_distance.triumph && !error && !cleanResult && (
+          <Message negative>
+            <Message.Header>{getTranslation("Request error")}</Message.Header>
+            <p> {data.complex_distance.message} </p>
+          </Message>
+        )}
+        { data && data.complex_distance.triumph && !error && !cleanResult && (
+          <Message positive>
+            <Message.Header>{getTranslation("Summary distance matrix grouped and merged by languages:")}</Message.Header>
+            <div dangerouslySetInnerHTML={{ __html: data.complex_distance.result }}></div>
+          </Message>
+        )}
+      </Segment>
+    )}
+    </div>
+  );
+})
+
+ComplexDistance.contextType = TranslationContext;
+
+export default ComplexDistance;
diff --git a/src/pages/ComplexDistance/style.scss b/src/pages/ComplexDistance/style.scss
new file mode 100644
index 00000000..47d93f0b
--- /dev/null
+++ b/src/pages/ComplexDistance/style.scss
@@ -0,0 +1,3 @@
+pre {
+    white-space: pre-wrap;
+}
\ No newline at end of file
diff --git a/src/pages/DistanceMap/getDistancePerspectives.js b/src/pages/DistanceMap/getDistancePerspectives.js
index 3e9f343d..d6efdf4a 100644
--- a/src/pages/DistanceMap/getDistancePerspectives.js
+++ b/src/pages/DistanceMap/getDistancePerspectives.js
@@ -100,6 +100,7 @@ const getDistance = async (dictionaries, allField, mainDictionary, computeDistan
 
   const perspectiveInfoList = perspectiveList
     .map(({ perspective }, index) => [
+      null,
       perspective.id,
       fieldDict[transcriptionFieldIdStrList[index]].id,
       fieldDict[translationFieldIdStrList[index]].id,
diff --git a/src/pages/ToolsRoute/index.js b/src/pages/ToolsRoute/index.js
index f8128a04..9eae121d 100644
--- a/src/pages/ToolsRoute/index.js
+++ b/src/pages/ToolsRoute/index.js
@@ -76,6 +76,12 @@ function ToolsRoute(props) {
                 <img className="card-item__img" src={imageStorage} />
               </Link>
             )}
+            {props.user.id !== undefined && (
+              <Link className="card-item" to="/complex_distance">
+                <label className="card-item__label">{getTranslation("Get complex distance between languages")}</label>
+                <img className="card-item__img card-item__img_map" src={imageMap} />
+              </Link>
+            )}
           </div>
         </div>
       </div>