diff --git a/Cargo.lock b/Cargo.lock
index e921acb..8f9dde5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -565,6 +565,7 @@ dependencies = [
  "js-sys",
  "lazy_static",
  "log",
+ "plate-tool-lib",
  "rand",
  "regex",
  "serde",
@@ -578,6 +579,20 @@ dependencies = [
  "yewdux",
 ]
 
+[[package]]
+name = "plate-tool-lib"
+version = "0.1.0"
+dependencies = [
+ "csv",
+ "getrandom",
+ "log",
+ "rand",
+ "regex",
+ "serde",
+ "serde_json",
+ "uuid",
+]
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
diff --git a/Cargo.toml b/Cargo.toml
index cc87d26..381c5c4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,6 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+plate-tool-lib = { path = "lib" }
 yew = { version = "0.20.0", features = ["csr"] }
 yewdux = "0.9"
 wasm-bindgen = "0.2"
diff --git a/assets/scss/default_theme/components/_plate_container.scss b/assets/scss/default_theme/components/_plate_container.scss
index cff857f..182bc24 100644
--- a/assets/scss/default_theme/components/_plate_container.scss
+++ b/assets/scss/default_theme/components/_plate_container.scss
@@ -15,4 +15,27 @@ div.plate_container {
 		margin-bottom: 1%;
 		text-align: center;
 	}
+
+	&>div {
+		display: grid;
+		grid-template-rows: auto auto;
+		grid-template-rows: auto auto;
+
+		&>h2:nth-of-type(1) {
+			grid-column: 2;
+			grid-row: 1;
+		}
+
+		&>h2:nth-of-type(2) {
+			grid-column: 1;
+			grid-row: 2;
+			writing-mode: vertical-rl;
+			transform: rotate(-180deg);
+		}
+
+		&>div {
+			grid-column:2;
+			grid-row: 2;
+		}
+	}
 }
diff --git a/lib/.gitignore b/lib/.gitignore
new file mode 100644
index 0000000..4f96631
--- /dev/null
+++ b/lib/.gitignore
@@ -0,0 +1,2 @@
+/target
+/dist
diff --git a/lib/Cargo.lock b/lib/Cargo.lock
new file mode 100644
index 0000000..5c974a4
--- /dev/null
+++ b/lib/Cargo.lock
@@ -0,0 +1,339 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aho-corasick"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "atomic"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c59bdb34bc650a32731b31bd8f0829cc15d24a708ee31559e0bb34f2bc320cba"
+
+[[package]]
+name = "bumpalo"
+version = "3.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f30e7476521f6f8af1a1c4c0b8cc94f0bee37d91763d0ca2665f299b6cd8aec"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "csv"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac574ff4d437a7b5ad237ef331c17ccca63c46479e5b5453eb8e10bb99a759fe"
+dependencies = [
+ "csv-core",
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "csv-core"
+version = "0.1.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5efa2b3d7902f4b634a20cae3c9c4e6209dc4779feb6863329607560143efa70"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "190092ea657667030ac6a35e305e62fc4dd69fd98ac98631e5d3a2b1575a12b5"
+dependencies = [
+ "cfg-if",
+ "js-sys",
+ "libc",
+ "wasi",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "itoa"
+version = "1.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1a46d1a171d865aa5f83f92695765caa047a9b4cbae2cbf37dbd613a793fd4c"
+
+[[package]]
+name = "js-sys"
+version = "0.3.68"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "406cda4b368d531c842222cf9d2600a9a4acce8d29423695379c6868a143a9ee"
+dependencies = [
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.153"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
+
+[[package]]
+name = "log"
+version = "0.4.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
+
+[[package]]
+name = "memchr"
+version = "2.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "523dc4f511e55ab87b694dc30d0f820d60906ef06413f93d4d7a1385599cc149"
+
+[[package]]
+name = "once_cell"
+version = "1.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
+
+[[package]]
+name = "plate-tool-lib"
+version = "0.1.0"
+dependencies = [
+ "csv",
+ "getrandom",
+ "log",
+ "rand",
+ "regex",
+ "serde",
+ "serde_json",
+ "uuid",
+]
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.78"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
+[[package]]
+name = "regex"
+version = "1.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b62dbe01f0b06f9d8dc7d49e05a0785f153b00b2c227856282f671e0318c9b15"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5bb987efffd3c6d0d8f5f89510bb458559eab11e4f869acb20bf845e016259cd"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
+
+[[package]]
+name = "ryu"
+version = "1.0.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f98d2aa92eebf49b69786be48e4477826b256916e84a57ff2a4f21923b48eb4c"
+
+[[package]]
+name = "serde"
+version = "1.0.196"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "870026e60fa08c69f064aa766c10f10b1d62db9ccd4d0abb206472bee0ce3b32"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.196"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33c85360c95e7d137454dc81d9a4ed2b8efd8fbe19cee57357b32b9771fccb67"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.113"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69801b70b1c3dac963ecb03a364ba0ceda9cf60c71cfe475e99864759c8b8a79"
+dependencies = [
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.48"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0f3531638e407dfc0814761abb7c00a5b54992b849452a0646b7f65c9f770f3f"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
+
+[[package]]
+name = "uuid"
+version = "1.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f00cc9702ca12d3c81455259621e676d0f7251cec66a21e98fe2e9a37db93b2a"
+dependencies = [
+ "atomic",
+ "getrandom",
+ "rand",
+ "serde",
+ "uuid-macro-internal",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "uuid-macro-internal"
+version = "1.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7abb14ae1a50dad63eaa768a458ef43d298cd1bd44951677bd10b732a9ba2a2d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
+[[package]]
+name = "wasm-bindgen"
+version = "0.2.91"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c1e124130aee3fb58c5bdd6b639a0509486b0338acaaae0c84a5124b0f588b7f"
+dependencies = [
+ "cfg-if",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.91"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9e7e1900c352b609c8488ad12639a311045f40a35491fb69ba8c12f758af70b"
+dependencies = [
+ "bumpalo",
+ "log",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.91"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b30af9e2d358182b5c7449424f017eba305ed32a7010509ede96cdc4696c46ed"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.91"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "642f325be6301eb8107a83d12a8ac6c1e1c54345a7ef1a9261962dfefda09e66"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.91"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4f186bd2dcf04330886ce82d6f33dd75a7bfcf69ecf5763b89fcde53b6ac9838"
diff --git a/lib/Cargo.toml b/lib/Cargo.toml
new file mode 100644
index 0000000..c8103a2
--- /dev/null
+++ b/lib/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "plate-tool-lib"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+log = "0.4"
+regex = "1"
+uuid = { version = "1.6", features = ["v7", "fast-rng", "macro-diagnostics", "js", "serde"] }
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+csv = "1.2"
+getrandom = { version = "0.2", features = ["js"] }
+rand = { version = "0.8", features = ["small_rng"] }
diff --git a/src/data/csv.rs b/lib/src/csv.rs
similarity index 95%
rename from src/data/csv.rs
rename to lib/src/csv.rs
index c0f03dc..8a4ee25 100644
--- a/src/data/csv.rs
+++ b/lib/src/csv.rs
@@ -1,6 +1,6 @@
-use crate::components::states::MainState;
-use crate::components::transfer_menu::num_to_letters;
-use crate::data::transfer::Transfer;
+// use crate::components::states::MainState;
+use crate::transfer::Transfer;
+use crate::util::*;
 
 use serde::{Serialize, Deserialize};
 use std::error::Error;
@@ -21,6 +21,7 @@ pub struct TransferRecord {
     pub concentration: Option<f32>,
 }
 
+/*
 pub fn state_to_csv(state: &MainState) -> Result<String, Box<dyn Error>> {
     let mut records: Vec<TransferRecord> = Vec::new();
     for transfer in &state.transfers {
@@ -42,6 +43,7 @@ pub fn state_to_csv(state: &MainState) -> Result<String, Box<dyn Error>> {
     }
     records_to_csv(records)
 }
+*/
 
 fn transfer_to_records(
     tr: &Transfer,
diff --git a/src/data/mod.rs b/lib/src/lib.rs
similarity index 87%
rename from src/data/mod.rs
rename to lib/src/lib.rs
index bc5afaa..a85a4bb 100644
--- a/src/data/mod.rs
+++ b/lib/src/lib.rs
@@ -3,3 +3,4 @@ pub mod plate;
 pub mod plate_instances;
 pub mod transfer;
 pub mod transfer_region;
+pub mod util;
diff --git a/src/data/plate.rs b/lib/src/plate.rs
similarity index 100%
rename from src/data/plate.rs
rename to lib/src/plate.rs
diff --git a/src/data/plate_instances.rs b/lib/src/plate_instances.rs
similarity index 100%
rename from src/data/plate_instances.rs
rename to lib/src/plate_instances.rs
diff --git a/src/data/transfer.rs b/lib/src/transfer.rs
similarity index 100%
rename from src/data/transfer.rs
rename to lib/src/transfer.rs
diff --git a/src/data/transfer_region.rs b/lib/src/transfer_region.rs
similarity index 100%
rename from src/data/transfer_region.rs
rename to lib/src/transfer_region.rs
diff --git a/lib/src/util.rs b/lib/src/util.rs
new file mode 100644
index 0000000..b8ec34d
--- /dev/null
+++ b/lib/src/util.rs
@@ -0,0 +1,70 @@
+pub fn letters_to_num(letters: &str) -> Option<u8> {
+    let mut num: u8 = 0;
+    for (i, letter) in letters.to_ascii_uppercase().chars().rev().enumerate() {
+        log::debug!("{}, {}", i, letter);
+        let n = letter as u8;
+        if !(65..=90).contains(&n) {
+            return None;
+        }
+        num = num.checked_add((26_i32.pow(i as u32) * (n as i32 - 64)).try_into().ok()?)?;
+    }
+    Some(num)
+}
+pub fn num_to_letters(num: u8) -> Option<String> {
+    if num == 0 {
+        return None;
+    } // Otherwise, we will not return none!
+      // As another note, we can't represent higher than "IV" anyway;
+      // thus there's no reason for a loop (26^n with n>1 will NOT occur).
+    let mut text = "".to_string();
+    let mut digit1 = num.div_euclid(26u8);
+    let mut digit2 = num.rem_euclid(26u8);
+    if digit1 > 0 && digit2 == 0u8 {
+        digit1 -= 1;
+        digit2 = 26;
+    }
+    if digit1 != 0 {
+        text.push((64 + digit1) as char)
+    }
+    text.push((64 + digit2) as char);
+
+    Some(text.to_string())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{letters_to_num, num_to_letters, RegionDisplay};
+
+    #[test]
+    fn test_letters_to_num() {
+        assert_eq!(letters_to_num("D"), Some(4));
+        assert_eq!(letters_to_num("d"), None);
+        assert_eq!(letters_to_num("AD"), Some(26 + 4));
+        assert_eq!(letters_to_num("CG"), Some(3 * 26 + 7));
+    }
+
+    #[test]
+    fn test_num_to_letters() {
+        println!("27 is {:?}", num_to_letters(27));
+        assert_eq!(num_to_letters(1), Some("A".to_string()));
+        assert_eq!(num_to_letters(26), Some("Z".to_string()));
+        assert_eq!(num_to_letters(27), Some("AA".to_string()));
+        assert_eq!(num_to_letters(111), Some("DG".to_string()));
+    }
+
+    #[test]
+    fn test_l2n_and_n2l() {
+        assert_eq!(
+            num_to_letters(letters_to_num("A").unwrap()),
+            Some("A".to_string())
+        );
+        assert_eq!(
+            num_to_letters(letters_to_num("BJ").unwrap()),
+            Some("BJ".to_string())
+        );
+        for i in 1..=255 {
+            assert_eq!(letters_to_num(&num_to_letters(i).unwrap()), Some(i));
+        }
+    }
+
+}
diff --git a/src/components/plates/plate_container.rs b/src/components/plates/plate_container.rs
index 8746e81..88a50ee 100644
--- a/src/components/plates/plate_container.rs
+++ b/src/components/plates/plate_container.rs
@@ -55,11 +55,13 @@ pub fn PlateContainer(props: &PlateContainerProps) -> Html {
             if let Some(dpi) = props.destination_dims.clone() {
             <div class="plate_container--source">
                 <h2>{spi.name.clone()}</h2>
+                <h2>{"Source"}</h2>
                 <Plate source_plate={spi.clone()} destination_plate={dpi.clone()}
                 cell_height={cell_height} ptype={PlateType::Source}/>
             </div>
             <div class="plate_container--destination">
                 <h2>{dpi.name.clone()}</h2>
+                <h2>{"Destination"}</h2>
                 <Plate source_plate={spi.clone()} destination_plate={dpi.clone()}
                 cell_height={cell_height} ptype={PlateType::Destination}/>
             </div>
diff --git a/src/components/transfer_menu.rs b/src/components/transfer_menu.rs
index 3b298c7..125d478 100644
--- a/src/components/transfer_menu.rs
+++ b/src/components/transfer_menu.rs
@@ -277,80 +277,11 @@ impl TryFrom<(u8, u8, u8, u8)> for RegionDisplay {
         })
     }
 }
-pub fn letters_to_num(letters: &str) -> Option<u8> {
-    let mut num: u8 = 0;
-    for (i, letter) in letters.to_ascii_uppercase().chars().rev().enumerate() {
-        log::debug!("{}, {}", i, letter);
-        let n = letter as u8;
-        if !(65..=90).contains(&n) {
-            return None;
-        }
-        num = num.checked_add((26_i32.pow(i as u32) * (n as i32 - 64)).try_into().ok()?)?;
-    }
-    Some(num)
-}
-pub fn num_to_letters(num: u8) -> Option<String> {
-    if num == 0 {
-        return None;
-    } // Otherwise, we will not return none!
-      // As another note, we can't represent higher than "IV" anyway;
-      // thus there's no reason for a loop (26^n with n>1 will NOT occur).
-    let mut text = "".to_string();
-    let mut digit1 = num.div_euclid(26u8);
-    let mut digit2 = num.rem_euclid(26u8);
-    if digit1 > 0 && digit2 == 0u8 {
-        digit1 -= 1;
-        digit2 = 26;
-    }
-    if digit1 != 0 {
-        text.push((64 + digit1) as char)
-    }
-    text.push((64 + digit2) as char);
-
-    Some(text.to_string())
-}
 
 #[cfg(test)]
 mod tests {
     use wasm_bindgen_test::*;
 
-    use super::{letters_to_num, num_to_letters, RegionDisplay};
-
-    #[test]
-    #[wasm_bindgen_test]
-    fn test_letters_to_num() {
-        assert_eq!(letters_to_num("D"), Some(4));
-        assert_eq!(letters_to_num("d"), None);
-        assert_eq!(letters_to_num("AD"), Some(26 + 4));
-        assert_eq!(letters_to_num("CG"), Some(3 * 26 + 7));
-    }
-
-    #[test]
-    #[wasm_bindgen_test]
-    fn test_num_to_letters() {
-        println!("27 is {:?}", num_to_letters(27));
-        assert_eq!(num_to_letters(1), Some("A".to_string()));
-        assert_eq!(num_to_letters(26), Some("Z".to_string()));
-        assert_eq!(num_to_letters(27), Some("AA".to_string()));
-        assert_eq!(num_to_letters(111), Some("DG".to_string()));
-    }
-
-    #[test]
-    #[wasm_bindgen_test]
-    fn test_l2n_and_n2l() {
-        assert_eq!(
-            num_to_letters(letters_to_num("A").unwrap()),
-            Some("A".to_string())
-        );
-        assert_eq!(
-            num_to_letters(letters_to_num("BJ").unwrap()),
-            Some("BJ".to_string())
-        );
-        for i in 1..=255 {
-            assert_eq!(letters_to_num(&num_to_letters(i).unwrap()), Some(i));
-        }
-    }
-
     #[test]
     #[wasm_bindgen_test]
     fn test_try_from_string_for_regiondisplay() {