diff --git a/app.js b/app.js
index 1cf42c37..6e704409 100644
--- a/app.js
+++ b/app.js
@@ -289,7 +289,7 @@ const script = {
         "kiri/tools",
         "@devices",
         "@icons"
-    ].map(p => p.charAt(0) !== '@' ? `src/${p}.js` : p),
+    ],
     worker : [
         "main/kiri",
         "ext/three",
@@ -341,7 +341,7 @@ const script = {
         "kiri/print",
         "kiri/codec",
         "kiri/worker"
-    ].map(p => `src/${p}.js`),
+    ],
     minion : [
         "main/kiri",
         "add/license",
@@ -367,7 +367,7 @@ const script = {
         "kiri/widget",
         "kiri/codec",
         "kiri/minion"
-    ].map(p => `src/${p}.js`),
+    ],
     engine : [
         "main/kiri",
         "add/license",
@@ -394,10 +394,10 @@ const script = {
         "kiri/widget",
         "kiri/codec",
         "kiri/engine"
-    ].map(p => `src/${p}.js`),
+    ],
     frame : [
         "kiri/frame"
-    ].map(p => `src/${p}.js`),
+    ],
     meta : [
         "ext/three",
         "add/license",
@@ -425,32 +425,19 @@ const script = {
         "moto/ui",
         "kiri/catalog",
         "main/meta"
-    ].map(p => `src/${p}.js`),
+    ],
     mesh : [
         "main/mesh",
+        "moto/client",
         "ext/three",
         "ext/three-bgu",
         "ext/three-svg",
-        "ext/jszip",
         "add/license",
-        "ext/clip2",
         "ext/tween",
         "ext/fsave",
-        "ext/earcut",
-        "ext/base64",
         "add/array",
         "add/three",
-        "geo/base",
-        "geo/point",
-        "geo/points",
-        "geo/slope",
-        "geo/line",
-        "geo/bounds",
-        "geo/polygon",
-        "geo/polygons",
         "geo/mesh",
-        // "moto/kv",
-        // "moto/ajax",
         "moto/ctrl",
         "moto/space",
         "moto/load-3mf",
@@ -460,28 +447,35 @@ const script = {
         "moto/load-url",
         "moto/load-file",
         "moto/broker",
-        "moto/db",
-        // "kiri/ui",
-        // "kiri/do",
-        // "kiri/lang",
-        // "kiri/lang-en",
-        // "kiri/catalog",
-        // "kiri/slice",
-        // "kiri/layers",
-        // "kiri/client",
-        // "kiri/stack",
-        // "kiri/stacks",
-        // "kiri/widget",
-        // "kiri/print",
-        // "kiri/codec",
-        // "kiri/conf",
-        // "kiri/main",
-        // "kiri/init",
-        // "kiri/export",
-        // "kiri/tools",
-    ].map(p => `src/${p}.js`),
+        "moto/db"
+    ],
+    mesh_work : [
+        "moto/worker",
+        "add/license",
+        "ext/jszip",
+        "ext/clip2",
+        "ext/earcut",
+        "ext/base64",
+        "ext/three",
+        "add/three",
+        "ext/three-bgu",
+        "geo/base",
+        "geo/point",
+        "geo/points",
+        "geo/slope",
+        "geo/line",
+        "geo/bounds",
+        "geo/polygon",
+        "geo/polygons",
+        "geo/mesh",
+    ]
 };
 
+// process script dependencies, expand paths
+for (let [key,val] of Object.entries(script)) {
+    script[key] = val.map(p => p.charAt(0) !== '@' ? `src/${p}.js` : p);
+}
+
 // prevent caching of specified modules
 const cachever = {};
 
@@ -644,13 +638,9 @@ function generateDevices() {
 function prepareScripts() {
     generateIcons();
     generateDevices();
-    code.meta = concatCode(script.meta);
-    code.mesh = concatCode(script.mesh);
-    code.kiri = concatCode(script.kiri);
-    code.worker = concatCode(script.worker);
-    code.minion = concatCode(script.minion);
-    code.engine = concatCode(script.engine);
-    code.frame = concatCode(script.frame);
+    for (let key of Object.keys(script)) {
+        code[key] = concatCode(script[key]);
+    }
 }
 
 function concatCode(array) {
diff --git a/notes.md b/notes.md
index da05bec0..abdd93af 100644
--- a/notes.md
+++ b/notes.md
@@ -1,4 +1,4 @@
-# Kiri:Moto todo and notes
+# Kiri:Moto / Grid:Apps notes
 
 ## `C` cosmetic, `F` functional, `P` performance, `B` bug fix
 
@@ -108,20 +108,3 @@
 # Laser
 
 * `F` add PLT / HP-GL output format (https://en.wikipedia.org/wiki/HP-GL)
-
-# References
-
-* https://www.canva.com/colors/color-wheel/
-* http://lcamtuf.coredump.cx/gcnc/full/
-* http://wiki.imal.org/howto/cnc-milling-introduction-cutting-tools
-* http://www.twak.co.uk/2011/01/degeneracy-in-weighted-straight.html
-* http://photon.chrisgraf.de/
-* https://github.com/Jack000/SVGnest
-
-# More CNC
-
-* https://www.researchgate.net/publication/250328721_Toolpath_Optimization_on_Automatic_Removal_Uncut_and_Application
-
-# Meta
-
-* free-space tetrahedron modeler with vertex mating
diff --git a/readme.md b/readme.md
index 532aa97a..5aaec83b 100644
--- a/readme.md
+++ b/readme.md
@@ -48,8 +48,8 @@ if installing the app-server fails or gives you permissions errors, then your no
 sudo npm install -g @gridspace/app-server
 ```
 
-to start a local instance of the apps. then open
-[localhost:8080/kiri](http://localhost:8080/kiri) on your local host
+to start a local instance of the apps. then use a browser to open
+[localhost:8080/kiri](http://localhost:8080/kiri)
 
 Alternatively, if you are using a packaged version of npm that ships with
 a Linux distribution, but still want to install in your home directory, you
@@ -73,7 +73,7 @@ cd grid-apps
 docker-compose -f src/dock/compose.yml up
 ```
 
-You can now access your environment of grid-apps by going to:
+You can now access your environment of grid-apps by going to
 [localhost:8080/kiri](http://127.0.0.1:8080/kiri)
 
 ### Windows Developers
diff --git a/src/main/mesh.js b/src/main/mesh.js
index 6ecfcb86..c30a696c 100644
--- a/src/main/mesh.js
+++ b/src/main/mesh.js
@@ -1,10 +1,14 @@
 // required for license and other grid app dependencies
-self.gapp = {};
+self.gapp = self.gapp || {};
 
 function $(id) {
     return document.getElementById(id);
 }
 
+function $d(id, v) {
+    $(id).style.display = v;
+}
+
 function init() {
     let container = $('container'),
         moto = self.moto,
@@ -28,10 +32,13 @@ function init() {
     Space.useDefaultKeys(true);
 
     // hide loading curtain
-    $('curtain').style.display = 'none';
+    $d('curtain','none');
 
     // remove version cache bust from url
     window.history.replaceState({},'','/mesh/');
+
+    // start worker
+    moto.client.start(`/code/mesh_work?${gapp.version}`);
 }
 
 document.onreadystatechange = function() {
diff --git a/src/moto/client.js b/src/moto/client.js
new file mode 100644
index 00000000..2376967a
--- /dev/null
+++ b/src/moto/client.js
@@ -0,0 +1,124 @@
+/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
+
+"use strict";
+
+(function() {
+
+let MOTO = self.moto = self.moto || {},
+    time = function() { return new Date().getTime() },
+    restarting = false,
+    running = {},
+    workurl = null,
+    worker = null,
+    seqid = 1;
+
+/**
+ * @param {Function} fn name of function in MOTO.worker
+ * @param {Object} data to send to server
+ * @param {Function} onreply function to call on reply messages
+ * @param {Object[]} zerocopy array of objects to pass using zerocopy
+ */
+function send(fn, data, onreply, zerocopy) {
+    let seq = seqid++;
+
+    if (onreply) {
+        // establish listener and track replies
+        running[seq] = { fn:onreply };
+    }
+    let msg = {
+        seq: seq,
+        task: fn,
+        time: time(),
+        data: data
+    };
+    try {
+        worker.postMessage(msg, zerocopy);
+    } catch (error) {
+        console.trace('work send error', {data, error});
+    }
+}
+
+// code is running in the browser / client context
+let CLIENT = MOTO.client = {
+    send: send,
+
+    // factory can be overridden
+    newWorker: function(url = workurl) {
+        if (self.createWorker) {
+            return self.createWorker();
+        } else {
+            return new Worker(workurl = url);
+        }
+    },
+
+    // return number of running requests
+    current: function() {
+        let current = 0;
+        for (let rec of Object.values(running)) {
+            if (rec.fn) current++;
+        }
+        return current;
+    },
+
+    stop: function() {
+        if (worker) {
+            worker.terminate();
+            worker = null;
+        }
+    },
+
+    // same as restart
+    start: function(url) {
+        CLIENT.restart(url);
+    },
+
+    restart: function(url) {
+        // prevent re-entry from cancel callback
+        if (restarting) {
+            return;
+        }
+
+        CLIENT.stop();
+
+        restarting = true;
+
+        for (let key in running) {
+            let rec = running[key];
+            if (rec.fn) {
+                rec.fn({error: "cancelled operation"});
+            }
+        }
+
+        running = {};
+        worker = CLIENT.newWorker(url);
+
+        // bind to CLIENT to enable synth injections
+        CLIENT.onmessage = worker.onmessage = function(e) {
+            let now = time(),
+                reply = e.data,
+                record = running[reply.seq],
+                onreply = record ? record.fn : undefined;
+
+            if (reply.done) {
+                delete running[reply.seq];
+            }
+
+            // calculate and replace recv time
+            reply.time_recv = now - reply.time_recv;
+
+            if (onreply) {
+                onreply(reply.data, reply);
+            } else {
+                console.log({drop_reply: reply});
+            }
+        };
+
+        // signal worker client is ready
+        worker.postMessage("--init--");
+
+        restarting = false;
+    }
+
+};
+
+})();
diff --git a/src/moto/worker.js b/src/moto/worker.js
new file mode 100644
index 00000000..9a9635f3
--- /dev/null
+++ b/src/moto/worker.js
@@ -0,0 +1,80 @@
+/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
+
+"use strict";
+
+(function() {
+
+let MOTO = self.moto = self.moto || {},
+    time = Date.now;
+
+// allow license to inject module
+self.gapp = self.gapp || MOTO;
+
+// code is running in the worker / server context
+const dispatch = MOTO.worker = {
+
+    send: (msg) => {
+        self.postMessage(msg);
+    },
+
+    onmessage: (e) => {
+
+        if (e.data === '--init--') {
+            console.log('worker got init');
+            return;
+        }
+
+        let time_recv = time(),
+            msg = e.data || {},
+            run = dispatch[msg.task],
+            send = {
+                data : function(data,direct) {
+                    dispatch.send({
+                        seq: msg.seq,
+                        task: msg.task,
+                        done: false,
+                        data: data
+                    }, direct);
+                },
+                done : function(data,direct) {
+                    dispatch.send({
+                        seq: msg.seq,
+                        task: msg.task,
+                        done: true,
+                        data: data
+                    }, direct);
+                }
+            };
+
+        if (run) {
+            try {
+                let time_xfer = (time_recv - msg.time),
+                    output = run(msg.data, send),
+                    time_send = time(),
+                    time_proc = time_send - time_recv;
+
+                if (output) dispatch.send({
+                    seq: msg.seq,
+                    task: msg.task,
+                    time_send: time_xfer,
+                    time_proc: time_proc,
+                    // replaced on reply side
+                    time_recv: time(),
+                    data: output
+                });
+            } catch (wrkerr) {
+                // console.log(wrkerr);
+                console.trace(wrkerr.stack);
+                send.done({error: wrkerr.toString()});
+            }
+        } else {
+            console.log({worker_unhandled: e, msg, fn: dispatch[msg.task]});
+        }
+    }
+
+};
+
+// attach onmessage hanler
+self.onmessage = dispatch.onmessage;
+
+})();
diff --git a/web/mesh/index.css b/web/mesh/index.css
index 2b818769..ffe82635 100644
--- a/web/mesh/index.css
+++ b/web/mesh/index.css
@@ -9,7 +9,7 @@
 }
 @font-face {
     font-family: 'Russo One';
-    src: url('ext/russo-one.ttf');
+    src: url('/kiri/ext/russo-one.ttf');
 }
 a, a:hover, a:visited {
     border: none;
@@ -28,17 +28,33 @@ a, a:hover, a:visited {
     bottom: 0;
 }
 #app-name {
-    position: absolute;
+    xposition: absolute;
     top: 50%;
     left: 50%;
     transform: translateX(-50%) translateY(-50%);
     z-index: 50;
 }
-#app-name, #app-mode-name, #app-acct {
-    cursor: pointer;
+#app-name:hover #app-info {
+    display: flex;
 }
-#app-mode-name {
-    border-bottom: 2px dotted grey;
+#app-info {
+    display: none;
+    position: absolute;
+    white-space: nowrap;
+    font-size: smaller;
+    font-family: sans-serif;
+    margin-top: 5px;
+    padding: 5px;
+    transform: translateX(-50%);
+    left: 50%;
+    top: 100%;
+    color: var(--fg-gray);
+    border-radius: 3px;
+    border: 1px solid #ddd;
+    background-color: white;
+}
+#app-name, #app-acct {
+    cursor: pointer;
 }
 #app,div {
     display: flex;
@@ -46,6 +62,11 @@ a, a:hover, a:visited {
     border: 0;
     margin: 0;
 }
+#top-sep, #mid-sep {
+    z-index: 14;
+    height: 1px;
+    background-image: var(--gradbar);
+}
 #gsbox {
     width: 40px;
     height: 40px;
diff --git a/web/mesh/index.html b/web/mesh/index.html
index 6c23b54a..0d442bf5 100644
--- a/web/mesh/index.html
+++ b/web/mesh/index.html
@@ -14,7 +14,7 @@
     <title>Mesh:Tool</title>
     <link rel="icon" href="/kiri/favicon.ico">
     <link rel="apple-touch-icon" href="/kiri/favicon-mobile.png">
-    <link rel="stylesheet" type="text/css" href="/kiri/index.css?{{version}}">
+    <link rel="stylesheet" type="text/css" href="/mesh/index.css?{{version}}">
     <link href="/font/css/all.min.css" rel="stylesheet">
     <script src="/font/js/all.min.js" crossorigin="anonymous"></script>
     <script src="/code/mesh.js?{{version}}"></script>
@@ -24,23 +24,18 @@
     <div id="curtain" class="j-center a-center"><img id="gsbox"/>loading...</div>
     <div id="container"></div>
     <div id="tracker"></div>
-    <div id="top-sep"></div>
     <div id="top" class="f-row">
+        <div id="app-name" class="f-col a-center">
+            <div>Mesh:Tool<div id="app-info">version</div></div>
+        </div>
     </div>
+    <div id="mid-sep"></div>
     <div id="gdpr" class="noshow">
         <p>this site uses <A href="/privacy.html" target="privacy">cookies</a> to preserve application preferences</p>
         <button id="gotit" class="f-col j-center">got it</button>
     </div>
     <div id="tool-info" class="noshow"></div>
     <div id="fps" class="noshow"></div>
-    <div id="alert-area">
-        <div id="alert-border">
-            <div id="alert-text">alerts<br>alerts<br>alerts</div>
-        </div>
-    </div>
-    <div id="top-slider" class="f-col grow">
-        <input id="anim-slider" type="range" min="0" max="1000" value="0"></input>
-    </div>
 </div>
 </body>
 </html>