diff --git a/apps/web/Dockerfile b/apps/web/Dockerfile
index a1ee512..74b127e 100644
--- a/apps/web/Dockerfile
+++ b/apps/web/Dockerfile
@@ -22,6 +22,11 @@ ARG PUBLIC_KEYCLOAK_URL
 ARG PUBLIC_KEYCLOAK_REALM
 ARG PUBLIC_KEYCLOAK_CLIENT_ID
 ARG PUBLIC_APP_URL
+# Fase 14.3.5 — short git sha of the deploy. Surfaced in /settings via
+# `$lib/version`. Optional: when unset the build falls back to `git
+# rev-parse` (only works if .git is in the build context) and then to
+# the literal 'dev'.
+ARG GIT_SHA
 
 ENV PUBLIC_SUPABASE_URL=$PUBLIC_SUPABASE_URL
 ENV PUBLIC_SUPABASE_ANON_KEY=$PUBLIC_SUPABASE_ANON_KEY
@@ -29,6 +34,7 @@ ENV PUBLIC_KEYCLOAK_URL=$PUBLIC_KEYCLOAK_URL
 ENV PUBLIC_KEYCLOAK_REALM=$PUBLIC_KEYCLOAK_REALM
 ENV PUBLIC_KEYCLOAK_CLIENT_ID=$PUBLIC_KEYCLOAK_CLIENT_ID
 ENV PUBLIC_APP_URL=$PUBLIC_APP_URL
+ENV GIT_SHA=$GIT_SHA
 
 COPY --from=deps /app/node_modules ./node_modules
 COPY --from=deps /app/apps/web/node_modules ./apps/web/node_modules
diff --git a/apps/web/src/lib/version.test.ts b/apps/web/src/lib/version.test.ts
new file mode 100644
index 0000000..3bac6a5
--- /dev/null
+++ b/apps/web/src/lib/version.test.ts
@@ -0,0 +1,46 @@
+/**
+ * Fase 14.3.6 — guard the version.ts barrel against accidental
+ * tree-shaking / undefined replacement.
+ *
+ * Vitest doesn't run through Vite's `define`, so the `__APP_*`
+ * globals don't exist in this environment. We stub them via
+ * `vi.stubGlobal` to mimic what `vite build` (and `vite dev`)
+ * inject at build/dev time.
+ *
+ * The point of the test is two-fold:
+ *   1. The module re-exports the three globals as an object so
+ *      consumers never reach for the `__APP_*` symbols inline.
+ *   2. None of the three exports collapse to `undefined` or the
+ *      sentinel `'dev'` when the build-time substitution is
+ *      working — that's the canary for an accidental tree-shake
+ *      that would silently break the version chip in production.
+ */
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+describe('version barrel', () => {
+	beforeEach(() => {
+		vi.resetModules();
+		vi.stubGlobal('__APP_VERSION__', '1.2.3');
+		vi.stubGlobal('__APP_COMMIT__', 'abc1234');
+		vi.stubGlobal('__BUILD_TIME__', '2026-05-18T10:00:00.000Z');
+	});
+
+	afterEach(() => {
+		vi.unstubAllGlobals();
+	});
+
+	it('V-01: exports version / commit / builtAt from the build-time define', async () => {
+		const mod = await import('./version');
+		expect(mod.version).toBe('1.2.3');
+		expect(mod.commit).toBe('abc1234');
+		expect(mod.builtAt).toBe('2026-05-18T10:00:00.000Z');
+	});
+
+	it('V-02: none of the exports are undefined or the "dev" sentinel under a real build define', async () => {
+		const mod = await import('./version');
+		for (const v of [mod.version, mod.commit, mod.builtAt]) {
+			expect(v).toBeTruthy();
+			expect(v).not.toBe('dev');
+		}
+	});
+});
diff --git a/apps/web/src/lib/version.ts b/apps/web/src/lib/version.ts
new file mode 100644
index 0000000..3996a94
--- /dev/null
+++ b/apps/web/src/lib/version.ts
@@ -0,0 +1,19 @@
+/**
+ * Fase 14.3 — build-time version information.
+ *
+ * The `__APP_*` globals are inlined by Vite's `define` (see
+ * `apps/web/vite.config.ts`) at build AND dev time. Touching them
+ * only through this barrel keeps the substitution localised:
+ *
+ *   - If the symbol is ever tree-shaken out of a component, only
+ *     this module breaks (caught by `version.test.ts`).
+ *   - Consumers depend on a stable named export instead of a magic
+ *     global, so swapping the source (e.g. moving to a runtime
+ *     /version endpoint) is a one-file change.
+ *
+ * Declarations for the three globals live in
+ * `apps/web/src/global.d.ts`.
+ */
+export const version: string = __APP_VERSION__;
+export const commit: string = __APP_COMMIT__;
+export const builtAt: string = __BUILD_TIME__;
diff --git a/apps/web/src/routes/(app)/settings/+page.svelte b/apps/web/src/routes/(app)/settings/+page.svelte
index 44b7c62..edb5394 100644
--- a/apps/web/src/routes/(app)/settings/+page.svelte
+++ b/apps/web/src/routes/(app)/settings/+page.svelte
@@ -30,6 +30,7 @@
 		PUBLIC_KEYCLOAK_URL,
 		PUBLIC_KEYCLOAK_REALM
 	} from '$env/static/public';
+	import { version, commit, builtAt } from '$lib/version';
 
 	// Profile state loaded from public.users
 	let displayNameInput = $state('');
@@ -607,6 +608,17 @@
 				</button>
 			</section>
 
+			<!-- About (Fase 14.3.4) — version / commit / build-time chip.
+			     Not clickable, just informational. -->
+			<section class="pt-8" data-testid="settings-about">
+				<p class="mb-2 text-[13px] font-semibold uppercase tracking-[0.05em] text-text-secondary">
+					{m.settings_about()}
+				</p>
+				<p class="text-xs text-text-secondary" data-testid="settings-about-version">
+					{m.settings_about_version({ version, commit, date: builtAt.slice(0, 10) })}
+				</p>
+			</section>
+
 			<!-- Danger zone (Fase 10.5) -->
 			<section class="pt-8">
 				<p class="mb-3 text-[13px] font-semibold uppercase tracking-[0.05em] text-destructive">
diff --git a/apps/web/vite.config.ts b/apps/web/vite.config.ts
index a214446..8f008d2 100644
--- a/apps/web/vite.config.ts
+++ b/apps/web/vite.config.ts
@@ -2,8 +2,37 @@ import { defineConfig } from 'vite';
 import { sveltekit } from '@sveltejs/kit/vite';
 import { SvelteKitPWA } from '@vite-pwa/sveltekit';
 import { paraglide } from '@inlang/paraglide-sveltekit/vite';
+import { execSync } from 'node:child_process';
+import { readFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+
+// Fase 14.3.1 — build-time version constants.
+// Source order: explicit GIT_SHA env (used by `apps/web/Dockerfile`
+// during `infra/scripts/deploy-erosi.sh`) > local `git rev-parse` >
+// 'dev' fallback when neither path works (e.g. tarball builds).
+const rootPkgUrl = new URL('../../package.json', import.meta.url);
+const rootPkg = JSON.parse(readFileSync(fileURLToPath(rootPkgUrl), 'utf8')) as {
+	version?: string;
+};
+const APP_VERSION = rootPkg.version ?? '0.0.0';
+let APP_COMMIT: string = process.env.GIT_SHA ?? '';
+if (!APP_COMMIT) {
+	try {
+		APP_COMMIT = execSync('git rev-parse --short HEAD', { stdio: ['ignore', 'pipe', 'ignore'] })
+			.toString()
+			.trim();
+	} catch {
+		APP_COMMIT = 'dev';
+	}
+}
+const BUILD_TIME = new Date().toISOString();
 
 export default defineConfig({
+	define: {
+		__APP_VERSION__: JSON.stringify(APP_VERSION),
+		__APP_COMMIT__: JSON.stringify(APP_COMMIT),
+		__BUILD_TIME__: JSON.stringify(BUILD_TIME)
+	},
 	plugins: [
 		paraglide({
 			project: './project.inlang',
diff --git a/infra/docker-compose.erosi.yml b/infra/docker-compose.erosi.yml
index e60c301..7205044 100644
--- a/infra/docker-compose.erosi.yml
+++ b/infra/docker-compose.erosi.yml
@@ -178,6 +178,10 @@ services:
         PUBLIC_KEYCLOAK_REALM: ${PUBLIC_KEYCLOAK_REALM}
         PUBLIC_KEYCLOAK_CLIENT_ID: ${PUBLIC_KEYCLOAK_CLIENT_ID}
         PUBLIC_APP_URL: ${PUBLIC_APP_URL}
+        # Fase 14.3.5 — short git sha of the host's checkout, exported
+        # by infra/scripts/deploy-erosi.sh before invoking the build.
+        # Defaults to literal 'dev' if the deployer didn't set GIT_SHA.
+        GIT_SHA: ${GIT_SHA:-dev}
     restart: always
     environment:
       PUBLIC_SUPABASE_URL: ${PUBLIC_SUPABASE_URL}
diff --git a/infra/scripts/deploy-erosi.sh b/infra/scripts/deploy-erosi.sh
index 9bce207..ae88da9 100755
--- a/infra/scripts/deploy-erosi.sh
+++ b/infra/scripts/deploy-erosi.sh
@@ -26,7 +26,13 @@ DEPLOY_HOST="${DEPLOY_HOST:-ambrosio}"
 DEPLOY_PATH="${DEPLOY_PATH:-/opt/colectivo}"
 REPO_ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
 
-echo "==> Deploying to $DEPLOY_HOST:$DEPLOY_PATH"
+# Fase 14.3.5 — capture the short git sha on the deploy host (this
+# machine) so it can be baked into the built app bundle as
+# `__APP_COMMIT__`. We do it here rather than on ambrosio because we
+# rsync without `.git`, so the remote can't run `git rev-parse`.
+GIT_SHA="$(cd "$REPO_ROOT" && git rev-parse --short HEAD 2>/dev/null || echo dev)"
+
+echo "==> Deploying to $DEPLOY_HOST:$DEPLOY_PATH (commit $GIT_SHA)"
 
 # ── 1. Ensure target dir exists ────────────────────────────────────────────
 ssh "$DEPLOY_HOST" "sudo mkdir -p $DEPLOY_PATH && sudo chown \$(id -u):\$(id -g) $DEPLOY_PATH"
@@ -104,15 +110,21 @@ fi
 REMOTE
 
 # ── 4. Build + bring up the stack ─────────────────────────────────────────
-ssh "$DEPLOY_HOST" bash -s << 'REMOTE'
+# We forward GIT_SHA over the ssh env so the remote `docker compose build`
+# can substitute it into the Dockerfile build-arg (compose reads it from
+# the same shell, not from .env, so a transient export is enough). ssh
+# doesn't accept VAR=value args directly, so we prefix `env`.
+ssh "$DEPLOY_HOST" env GIT_SHA="$GIT_SHA" bash -s << 'REMOTE'
 set -euo pipefail
 cd /opt/colectivo
+: "${GIT_SHA:=dev}"
 
-echo "--- Building app image"
-docker compose --env-file .env -f infra/docker-compose.erosi.yml build app
+echo "--- Building app image (commit $GIT_SHA)"
+GIT_SHA="$GIT_SHA" docker compose --env-file .env -f infra/docker-compose.erosi.yml \
+	build --build-arg GIT_SHA="$GIT_SHA" app
 
 echo "--- Bringing stack up (detached)"
-docker compose --env-file .env -f infra/docker-compose.erosi.yml up -d
+GIT_SHA="$GIT_SHA" docker compose --env-file .env -f infra/docker-compose.erosi.yml up -d
 
 echo "--- Waiting for db to be healthy"
 for i in $(seq 1 60); do