diff --git a/apps/git/index.tsx b/apps/git/index.tsx
index 962a4b0..f8dfdc4 100644
--- a/apps/git/index.tsx
+++ b/apps/git/index.tsx
@@ -1,6 +1,6 @@
 import { Hype } from '@because/hype'
 import { define, stylesToCSS } from '@because/forge'
-import { baseStyles, ToolScript, theme, on } from '@because/toes/tools'
+import { baseStyles, ToolScript, theme, on, VALID_NAME } from '@because/toes/tools'
 import { mkdirSync } from 'fs'
 import { mkdir, readdir, readFile, rename, rm, stat, writeFile } from 'fs/promises'
 import { join, resolve } from 'path'
@@ -13,7 +13,6 @@ const DATA_ROOT = process.env.DATA_ROOT!
 const TOES_URL = process.env.TOES_URL!
 
 const REPOS_DIR = resolve(DATA_ROOT, 'repos')
-const VALID_NAME = /^[a-zA-Z0-9._-]+$/
 const VISIBILITY_PATH = join(DATA_DIR, 'visibility.json')
 
 const TOGGLE_SCRIPT = `
diff --git a/src/client/modals/NewApp.tsx b/src/client/modals/NewApp.tsx
index f39ce5b..95850f5 100644
--- a/src/client/modals/NewApp.tsx
+++ b/src/client/modals/NewApp.tsx
@@ -1,3 +1,4 @@
+import { VALID_NAME } from '../../shared/types'
 import { closeModal, openModal, renderModal } from '../components/modal'
 import { navigate } from '../router'
 import { apps } from '../state'
@@ -20,7 +21,7 @@ async function createNewApp() {
     return
   }
 
-  if (!/^[a-z][a-z0-9.-]*$/.test(name)) {
+  if (!VALID_NAME.test(name)) {
     newAppError = 'Name must start with a letter and contain only lowercase letters, numbers, dots, and hyphens'
     renderModal()
     return
diff --git a/src/client/modals/RenameApp.tsx b/src/client/modals/RenameApp.tsx
index 001e0f2..8e452a2 100644
--- a/src/client/modals/RenameApp.tsx
+++ b/src/client/modals/RenameApp.tsx
@@ -1,4 +1,5 @@
 import type { App } from '../../shared/types'
+import { VALID_NAME } from '../../shared/types'
 import { closeModal, openModal, renderModal } from '../components/modal'
 import { navigate } from '../router'
 import { apps } from '../state'
@@ -19,7 +20,7 @@ async function doRenameApp(input: HTMLInputElement) {
     return
   }
 
-  if (!/^[a-z][a-z0-9.-]*$/.test(newName)) {
+  if (!VALID_NAME.test(newName)) {
     renameAppError = 'Name must start with a letter and contain only lowercase letters, numbers, dots, and hyphens'
     renderModal()
     return
diff --git a/src/server/api/apps.ts b/src/server/api/apps.ts
index 9b48081..f8bd9b7 100644
--- a/src/server/api/apps.ts
+++ b/src/server/api/apps.ts
@@ -3,6 +3,7 @@ import { buildAppUrl } from '@urls'
 import { isTunnelsAvailable, shareApp, unshareApp } from '../tunnels'
 import type { App as BackendApp } from '$apps'
 import type { App as SharedApp } from '@types'
+import { VALID_NAME } from '@types'
 import { generateTemplates, type TemplateType } from '%templates'
 import { Hype } from '@because/hype'
 import { existsSync, mkdirSync, readFileSync, rmSync, writeFileSync } from 'fs'
@@ -120,7 +121,7 @@ router.post('/', async c => {
   const name = body.name?.trim().toLowerCase().replace(/\s+/g, '-')
   if (!name) return c.json({ ok: false, error: 'App name is required' }, 400)
 
-  if (!/^[a-z][a-z0-9.-]*$/.test(name)) {
+  if (!VALID_NAME.test(name)) {
     return c.json({ ok: false, error: 'Name must start with a letter and contain only lowercase letters, numbers, dots, and hyphens' }, 400)
   }
 
diff --git a/src/server/apps.ts b/src/server/apps.ts
index 3751745..1382c46 100644
--- a/src/server/apps.ts
+++ b/src/server/apps.ts
@@ -1,7 +1,7 @@
 import type { App as SharedApp, AppState } from '@types'
 import type { ToesEvent, ToesEventInput, ToesEventType } from '../shared/events'
 import type { Subprocess } from 'bun'
-import { DEFAULT_EMOJI } from '@types'
+import { DEFAULT_EMOJI, VALID_NAME } from '@types'
 import { buildAppUrl, toSubdomain } from '@urls'
 import { appendFileSync, existsSync, mkdirSync, readdirSync, readFileSync, renameSync, unlinkSync, writeFileSync } from 'fs'
 import { LOCAL_HOST } from '%config'
@@ -176,7 +176,7 @@ export async function renameApp(oldName: string, newName: string): Promise<{ ok:
 
   if (_apps.has(newName)) return { ok: false, error: 'An app with that name already exists' }
 
-  if (!/^[a-z][a-z0-9.-]*$/.test(newName)) {
+  if (!VALID_NAME.test(newName)) {
     return { ok: false, error: 'Name must start with a letter and contain only lowercase letters, numbers, dots, and hyphens' }
   }
 
diff --git a/src/shared/types.ts b/src/shared/types.ts
index 64984da..38c1ce4 100644
--- a/src/shared/types.ts
+++ b/src/shared/types.ts
@@ -1,4 +1,5 @@
 export const DEFAULT_EMOJI = '🖥️'
+export const VALID_NAME = /^[a-z][a-z0-9.-]*$/
 
 export interface FileInfo {
   hash: string
diff --git a/src/tools/index.ts b/src/tools/index.ts
index d2a98e2..d5b1cdb 100644
--- a/src/tools/index.ts
+++ b/src/tools/index.ts
@@ -1,3 +1,4 @@
+export { VALID_NAME } from '../shared/types'
 export { theme } from '../client/themes'
 export { loadAppEnv } from './env'
 export type { ToesEvent, ToesEventType } from './events'