diff --git a/src/app/api/auth/me/devices/[id]/__tests__/route.test.ts b/src/app/api/auth/me/devices/[id]/__tests__/route.test.ts
new file mode 100644
index 000000000..d8a5628f3
--- /dev/null
+++ b/src/app/api/auth/me/devices/[id]/__tests__/route.test.ts
@@ -0,0 +1,125 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { NextRequest } from "next/server";
+
+vi.mock("@/lib/db", () => ({
+  prisma: {
+    device: {
+      findUnique: vi.fn(),
+      delete: vi.fn(),
+    },
+    refreshToken: {
+      findMany: vi.fn(),
+      updateMany: vi.fn(),
+    },
+    apiToken: {
+      updateMany: vi.fn(),
+    },
+  },
+}));
+
+vi.mock("@/lib/auth/session", () => ({ getSession: vi.fn() }));
+
+vi.mock("@/lib/auth/audit", () => ({
+  auditLog: vi.fn().mockResolvedValue(undefined),
+}));
+
+vi.mock("@/lib/logging/transports", () => ({ emitIfSampled: vi.fn() }));
+
+vi.mock("@/lib/db-compat", () => ({
+  ensureDbCompatibility: vi.fn().mockResolvedValue(undefined),
+}));
+
+vi.mock("next/headers", () => ({
+  headers: vi.fn(async () => ({ get: () => null })),
+  cookies: vi.fn(async () => ({
+    get: () => undefined,
+    set: () => {},
+    delete: () => {},
+  })),
+}));
+
+import { DELETE } from "../route";
+import { prisma } from "@/lib/db";
+import { getSession } from "@/lib/auth/session";
+
+const SESSION_OK = {
+  session: { id: "sess-1", expiresAt: new Date(Date.now() + 3_600_000) },
+  user: { id: "user-1", username: "marc", role: "USER" as const },
+};
+
+function req(): NextRequest {
+  return new NextRequest("http://localhost/api/auth/me/devices/dev-x", {
+    method: "DELETE",
+  });
+}
+
+beforeEach(() => {
+  vi.resetAllMocks();
+  vi.mocked(prisma.refreshToken.findMany).mockResolvedValue([]);
+  vi.mocked(prisma.refreshToken.updateMany).mockResolvedValue({ count: 0 } as never);
+  vi.mocked(prisma.apiToken.updateMany).mockResolvedValue({ count: 0 } as never);
+});
+
+describe("DELETE /api/auth/me/devices/[id]", () => {
+  it("returns 401 when unauthenticated", async () => {
+    vi.mocked(getSession).mockResolvedValue(null);
+    const res = await DELETE(req(), { params: Promise.resolve({ id: "dev-1" }) });
+    expect(res.status).toBe(401);
+  });
+
+  it("returns 404 when the device doesn't exist", async () => {
+    vi.mocked(getSession).mockResolvedValue(SESSION_OK as never);
+    vi.mocked(prisma.device.findUnique).mockResolvedValue(null);
+    const res = await DELETE(req(), { params: Promise.resolve({ id: "dev-x" }) });
+    expect(res.status).toBe(404);
+  });
+
+  it("returns 404 when the device belongs to another user (no enumeration)", async () => {
+    vi.mocked(getSession).mockResolvedValue(SESSION_OK as never);
+    vi.mocked(prisma.device.findUnique).mockResolvedValue({
+      id: "dev-x",
+      userId: "user-2",
+      model: "iPhone",
+      bundleId: "io.healthlog.app",
+    } as never);
+    const res = await DELETE(req(), { params: Promise.resolve({ id: "dev-x" }) });
+    expect(res.status).toBe(404);
+    expect(vi.mocked(prisma.device.delete)).not.toHaveBeenCalled();
+  });
+
+  it("revokes refresh tokens + access tokens + deletes the device row", async () => {
+    vi.mocked(getSession).mockResolvedValue(SESSION_OK as never);
+    vi.mocked(prisma.device.findUnique).mockResolvedValue({
+      id: "dev-1",
+      userId: "user-1",
+      model: "iPhone",
+      bundleId: "io.healthlog.app",
+    } as never);
+    vi.mocked(prisma.refreshToken.findMany).mockResolvedValue([
+      { accessTokenHash: "hash:a1" },
+      { accessTokenHash: "hash:a2" },
+      { accessTokenHash: null },
+    ] as never);
+    vi.mocked(prisma.refreshToken.updateMany).mockResolvedValue({ count: 3 } as never);
+    vi.mocked(prisma.apiToken.updateMany).mockResolvedValue({ count: 2 } as never);
+    vi.mocked(prisma.device.delete).mockResolvedValue({ id: "dev-1" } as never);
+
+    const res = await DELETE(req(), { params: Promise.resolve({ id: "dev-1" }) });
+    expect(res.status).toBe(200);
+    const body = await res.json();
+    expect(body.data.revoked).toBe(true);
+    expect(body.data.refreshTokensRevoked).toBe(3);
+    expect(body.data.accessTokensRevoked).toBe(2);
+    expect(vi.mocked(prisma.device.delete)).toHaveBeenCalledWith({
+      where: { id: "dev-1" },
+    });
+    // The refresh-token revoke filter MUST scope to the deviceId, not
+    // every refresh row the user has.
+    const updateCall = vi.mocked(prisma.refreshToken.updateMany).mock.calls[0]?.[0];
+    expect(updateCall?.where).toMatchObject({
+      userId: "user-1",
+      deviceId: "dev-1",
+      revokedAt: null,
+    });
+  });
+});
diff --git a/src/app/api/auth/me/devices/[id]/route.ts b/src/app/api/auth/me/devices/[id]/route.ts
new file mode 100644
index 000000000..a5661d7a0
--- /dev/null
+++ b/src/app/api/auth/me/devices/[id]/route.ts
@@ -0,0 +1,94 @@
+/**
+ * DELETE /api/auth/me/devices/[id]
+ *
+ * v1.4.23 W4 F7b — revoke a single device.
+ *
+ * Behaviour:
+ *   1. Confirms the device row belongs to the current user (ownership
+ *      boundary — 404 on cross-user attempts so callers can't probe
+ *      another tenant's device ids).
+ *   2. Revokes every active refresh token bound to this `deviceId` and
+ *      the access tokens those refresh rows pair with.
+ *   3. Deletes the `Device` row outright. Future re-pairing will create
+ *      a fresh row.
+ *
+ * Note: this route does NOT touch the user's browser session cookie —
+ * the session lives on `Session.id`, not `Device.id`. Browser logouts
+ * keep using /api/auth/logout. The two surfaces address different
+ * blast radii.
+ */
+import { NextRequest } from "next/server";
+import { apiHandler, requireAuth } from "@/lib/api-handler";
+import { apiError, apiSuccess } from "@/lib/api-response";
+import { annotate } from "@/lib/logging/context";
+import { auditLog } from "@/lib/auth/audit";
+import { prisma } from "@/lib/db";
+
+interface RouteContext {
+  params: Promise<{ id: string }>;
+}
+
+export const DELETE = apiHandler(
+  async (_request: NextRequest, context: RouteContext) => {
+    const { user } = await requireAuth();
+    const { id } = await context.params;
+
+    const device = await prisma.device.findUnique({
+      where: { id },
+      select: { id: true, userId: true, model: true, bundleId: true },
+    });
+
+    if (!device || device.userId !== user.id) {
+      // 404 on cross-user attempts — leaking "this id exists but isn't
+      // yours" would let an attacker enumerate device ids.
+      return apiError("Device not found", 404);
+    }
+
+    // Revoke every refresh token bound to this device + its paired
+    // access tokens.
+    const liveRefreshTokens = await prisma.refreshToken.findMany({
+      where: { userId: user.id, deviceId: device.id, revokedAt: null },
+      select: { accessTokenHash: true },
+    });
+    const revokedAt = new Date();
+    await prisma.refreshToken.updateMany({
+      where: { userId: user.id, deviceId: device.id, revokedAt: null },
+      data: { revokedAt },
+    });
+    const accessHashes = liveRefreshTokens
+      .map((r) => r.accessTokenHash)
+      .filter((v): v is string => Boolean(v));
+    if (accessHashes.length > 0) {
+      await prisma.apiToken.updateMany({
+        where: { tokenHash: { in: accessHashes }, revoked: false },
+        data: { revoked: true },
+      });
+    }
+
+    await prisma.device.delete({ where: { id: device.id } });
+
+    await auditLog("devices.revoke", {
+      userId: user.id,
+      details: {
+        deviceId: device.id,
+        label: device.model ?? device.bundleId ?? null,
+        refreshTokensRevoked: liveRefreshTokens.length,
+        accessTokensRevoked: accessHashes.length,
+      },
+    });
+    annotate({
+      action: { name: "auth.me.devices.revoke", entity_type: "device", entity_id: device.id },
+      meta: {
+        refresh_tokens_revoked: liveRefreshTokens.length,
+        access_tokens_revoked: accessHashes.length,
+      },
+    });
+
+    return apiSuccess({
+      id: device.id,
+      revoked: true,
+      refreshTokensRevoked: liveRefreshTokens.length,
+      accessTokensRevoked: accessHashes.length,
+    });
+  },
+);
diff --git a/src/app/api/auth/me/devices/__tests__/route.test.ts b/src/app/api/auth/me/devices/__tests__/route.test.ts
new file mode 100644
index 000000000..3462c6a7e
--- /dev/null
+++ b/src/app/api/auth/me/devices/__tests__/route.test.ts
@@ -0,0 +1,150 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { NextRequest } from "next/server";
+
+vi.mock("@/lib/db", () => ({
+  prisma: {
+    device: {
+      findMany: vi.fn(),
+    },
+  },
+}));
+
+vi.mock("@/lib/auth/session", () => ({ getSession: vi.fn() }));
+
+vi.mock("@/lib/logging/transports", () => ({ emitIfSampled: vi.fn() }));
+
+vi.mock("@/lib/db-compat", () => ({
+  ensureDbCompatibility: vi.fn().mockResolvedValue(undefined),
+}));
+
+vi.mock("next/headers", () => ({
+  headers: vi.fn(async () => ({ get: () => null })),
+  cookies: vi.fn(async () => ({
+    get: () => undefined,
+    set: () => {},
+    delete: () => {},
+  })),
+}));
+
+import { GET } from "../route";
+import { prisma } from "@/lib/db";
+import { getSession } from "@/lib/auth/session";
+
+const SESSION_OK = {
+  session: { id: "sess-1", expiresAt: new Date(Date.now() + 3_600_000) },
+  user: { id: "user-1", username: "marc", role: "USER" as const },
+};
+
+function req(deviceIdHeader?: string): NextRequest {
+  const headers: Record<string, string> = {};
+  if (deviceIdHeader) headers["x-device-id"] = deviceIdHeader;
+  return new NextRequest("http://localhost/api/auth/me/devices", {
+    method: "GET",
+    headers,
+  });
+}
+
+beforeEach(() => {
+  vi.resetAllMocks();
+  vi.mocked(prisma.device.findMany).mockResolvedValue([]);
+});
+
+describe("GET /api/auth/me/devices", () => {
+  it("returns 401 when unauthenticated", async () => {
+    vi.mocked(getSession).mockResolvedValue(null);
+    const res = await GET(req());
+    expect(res.status).toBe(401);
+  });
+
+  it("lists devices owned by the current user", async () => {
+    vi.mocked(getSession).mockResolvedValue(SESSION_OK as never);
+    vi.mocked(prisma.device.findMany).mockResolvedValue([
+      {
+        id: "dev-1",
+        userId: "user-1",
+        platform: "ios",
+        token: "tok-1",
+        bundleId: "io.healthlog.app",
+        locale: "en-US",
+        appVersion: "1.0",
+        model: "iPhone 14 Pro",
+        apnsToken: "aaaa",
+        apnsEnvironment: "production",
+        lastSeen: new Date("2026-05-10T12:00:00Z"),
+        createdAt: new Date("2026-05-01T12:00:00Z"),
+        updatedAt: new Date("2026-05-10T12:00:00Z"),
+      },
+      {
+        id: "dev-2",
+        userId: "user-1",
+        platform: "ios",
+        token: "tok-2",
+        bundleId: "io.healthlog.app",
+        locale: null,
+        appVersion: null,
+        model: "iPad Pro",
+        apnsToken: null,
+        apnsEnvironment: null,
+        lastSeen: new Date("2026-05-09T12:00:00Z"),
+        createdAt: new Date("2026-04-01T12:00:00Z"),
+        updatedAt: new Date("2026-05-09T12:00:00Z"),
+      },
+    ] as never);
+
+    const res = await GET(req());
+    expect(res.status).toBe(200);
+    const body = await res.json();
+    expect(body.data.devices).toHaveLength(2);
+    expect(body.data.devices[0].id).toBe("dev-1");
+    expect(body.data.devices[0].channels).toEqual(["web_push", "apns"]);
+    expect(body.data.devices[1].channels).toEqual(["web_push"]);
+  });
+
+  it("marks the matching device as isCurrent when X-Device-Id is present", async () => {
+    vi.mocked(getSession).mockResolvedValue(SESSION_OK as never);
+    vi.mocked(prisma.device.findMany).mockResolvedValue([
+      {
+        id: "dev-1",
+        userId: "user-1",
+        platform: "ios",
+        token: "tok-1",
+        bundleId: "io.healthlog.app",
+        locale: null,
+        appVersion: null,
+        model: "iPhone",
+        apnsToken: null,
+        apnsEnvironment: null,
+        lastSeen: new Date(),
+        createdAt: new Date(),
+        updatedAt: new Date(),
+      },
+      {
+        id: "dev-2",
+        userId: "user-1",
+        platform: "ios",
+        token: "tok-2",
+        bundleId: "io.healthlog.app",
+        locale: null,
+        appVersion: null,
+        model: "iPad",
+        apnsToken: null,
+        apnsEnvironment: null,
+        lastSeen: new Date(),
+        createdAt: new Date(),
+        updatedAt: new Date(),
+      },
+    ] as never);
+
+    const res = await GET(req("dev-2"));
+    const body = await res.json();
+    const current = body.data.devices.find((d: { isCurrent: boolean; id: string }) => d.isCurrent);
+    expect(current?.id).toBe("dev-2");
+  });
+
+  it("only queries devices for the authenticated user", async () => {
+    vi.mocked(getSession).mockResolvedValue(SESSION_OK as never);
+    await GET(req());
+    const where = vi.mocked(prisma.device.findMany).mock.calls[0]?.[0]?.where;
+    expect(where).toEqual({ userId: "user-1" });
+  });
+});
diff --git a/src/app/api/auth/me/devices/route.ts b/src/app/api/auth/me/devices/route.ts
new file mode 100644
index 000000000..5df0f6992
--- /dev/null
+++ b/src/app/api/auth/me/devices/route.ts
@@ -0,0 +1,70 @@
+/**
+ * GET /api/auth/me/devices
+ *
+ * v1.4.23 W4 F7b — list active devices for the current user. Drives the
+ * settings → security → devices surface in the v1.5 iOS app and the
+ * matching web view planned for a follow-up. The list ships
+ * device-identifying metadata only (label, lastSeen, channels) — no
+ * tokens, no APNs identifiers, no IPs.
+ *
+ * The "current device" marker is best-effort: the route inspects the
+ * X-Device-Id header (which the native client always sends) and marks
+ * the matching row with `isCurrent: true`. Browser callers don't have a
+ * device row and therefore see `isCurrent: false` across the board.
+ */
+import { NextRequest } from "next/server";
+import { apiHandler, requireAuth } from "@/lib/api-handler";
+import { apiSuccess } from "@/lib/api-response";
+import { annotate } from "@/lib/logging/context";
+import { prisma } from "@/lib/db";
+
+interface DeviceDTO {
+  id: string;
+  label: string;
+  platform: string;
+  appVersion: string | null;
+  locale: string | null;
+  channels: Array<"web_push" | "apns">;
+  lastSeenAt: string;
+  createdAt: string;
+  isCurrent: boolean;
+}
+
+export const GET = apiHandler(async (request: NextRequest) => {
+  const { user } = await requireAuth();
+  const currentDeviceId = request.headers.get("x-device-id");
+
+  const devices = await prisma.device.findMany({
+    where: { userId: user.id },
+    orderBy: { lastSeen: "desc" },
+  });
+
+  const result: DeviceDTO[] = devices.map((d) => {
+    const channels: DeviceDTO["channels"] = [];
+    // The legacy `token` column always carries the generic device
+    // identifier — for v1.4.23 it doubles as the web-push channel
+    // anchor when a VAPID subscription exists.
+    if (d.token) channels.push("web_push");
+    if (d.apnsToken) channels.push("apns");
+    return {
+      id: d.id,
+      // Prefer the `model` field as the label; fall back to bundleId or
+      // a generic platform string so the row never paints blank.
+      label: d.model ?? d.bundleId ?? d.platform,
+      platform: d.platform,
+      appVersion: d.appVersion,
+      locale: d.locale,
+      channels,
+      lastSeenAt: d.lastSeen.toISOString(),
+      createdAt: d.createdAt.toISOString(),
+      isCurrent: currentDeviceId !== null && d.id === currentDeviceId,
+    };
+  });
+
+  annotate({
+    action: { name: "auth.me.devices.list" },
+    meta: { device_count: result.length },
+  });
+
+  return apiSuccess({ devices: result });
+});
diff --git a/src/app/api/devices/[id]/__tests__/route.test.ts b/src/app/api/devices/[id]/__tests__/route.test.ts
new file mode 100644
index 000000000..e2661f97c
--- /dev/null
+++ b/src/app/api/devices/[id]/__tests__/route.test.ts
@@ -0,0 +1,99 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { NextRequest } from "next/server";
+
+vi.mock("@/lib/db", () => ({
+  prisma: {
+    device: {
+      findUnique: vi.fn(),
+      delete: vi.fn(),
+    },
+    refreshToken: {
+      findMany: vi.fn(),
+      updateMany: vi.fn(),
+    },
+    apiToken: {
+      updateMany: vi.fn(),
+    },
+  },
+}));
+
+vi.mock("@/lib/auth/session", () => ({ getSession: vi.fn() }));
+
+vi.mock("@/lib/auth/audit", () => ({
+  auditLog: vi.fn().mockResolvedValue(undefined),
+}));
+
+vi.mock("@/lib/logging/transports", () => ({ emitIfSampled: vi.fn() }));
+
+vi.mock("@/lib/db-compat", () => ({
+  ensureDbCompatibility: vi.fn().mockResolvedValue(undefined),
+}));
+
+vi.mock("next/headers", () => ({
+  headers: vi.fn(async () => ({ get: () => null })),
+  cookies: vi.fn(async () => ({
+    get: () => undefined,
+    set: () => {},
+    delete: () => {},
+  })),
+}));
+
+import { DELETE } from "../route";
+import { prisma } from "@/lib/db";
+import { getSession } from "@/lib/auth/session";
+
+const SESSION_OK = {
+  session: { id: "sess-1", expiresAt: new Date(Date.now() + 3_600_000) },
+  user: { id: "user-1", username: "marc", role: "USER" as const },
+};
+
+function req(): NextRequest {
+  return new NextRequest("http://localhost/api/devices/dev-x", {
+    method: "DELETE",
+  });
+}
+
+beforeEach(() => {
+  vi.resetAllMocks();
+  vi.mocked(prisma.refreshToken.findMany).mockResolvedValue([]);
+  vi.mocked(prisma.refreshToken.updateMany).mockResolvedValue({ count: 0 } as never);
+  vi.mocked(prisma.apiToken.updateMany).mockResolvedValue({ count: 0 } as never);
+});
+
+describe("DELETE /api/devices/[id] (iOS token-rotation endpoint)", () => {
+  it("returns 401 when unauthenticated", async () => {
+    vi.mocked(getSession).mockResolvedValue(null);
+    const res = await DELETE(req(), { params: Promise.resolve({ id: "dev-1" }) });
+    expect(res.status).toBe(401);
+  });
+
+  it("returns 404 on cross-user attempt", async () => {
+    vi.mocked(getSession).mockResolvedValue(SESSION_OK as never);
+    vi.mocked(prisma.device.findUnique).mockResolvedValue({
+      id: "dev-x",
+      userId: "user-2",
+      model: "iPhone",
+      bundleId: "io.healthlog.app",
+    } as never);
+    const res = await DELETE(req(), { params: Promise.resolve({ id: "dev-x" }) });
+    expect(res.status).toBe(404);
+  });
+
+  it("revokes the device + paired tokens", async () => {
+    vi.mocked(getSession).mockResolvedValue(SESSION_OK as never);
+    vi.mocked(prisma.device.findUnique).mockResolvedValue({
+      id: "dev-1",
+      userId: "user-1",
+      model: "iPhone",
+      bundleId: "io.healthlog.app",
+    } as never);
+    vi.mocked(prisma.refreshToken.findMany).mockResolvedValue([
+      { accessTokenHash: "hash:a1" },
+    ] as never);
+    vi.mocked(prisma.device.delete).mockResolvedValue({ id: "dev-1" } as never);
+
+    const res = await DELETE(req(), { params: Promise.resolve({ id: "dev-1" }) });
+    expect(res.status).toBe(200);
+    expect(vi.mocked(prisma.device.delete)).toHaveBeenCalled();
+  });
+});
diff --git a/src/app/api/devices/[id]/route.ts b/src/app/api/devices/[id]/route.ts
new file mode 100644
index 000000000..d84533628
--- /dev/null
+++ b/src/app/api/devices/[id]/route.ts
@@ -0,0 +1,86 @@
+/**
+ * DELETE /api/devices/[id]
+ *
+ * v1.4.23 W4 F7b alternate iOS endpoint — mirror of
+ * `DELETE /api/auth/me/devices/[id]` for the v1.5 iOS app's
+ * token-rotation cleanup path. Same ownership boundary, same audit
+ * trail, same cascade.
+ *
+ * The duplication is deliberate: the W3 open question called out
+ * needing a native-friendly URL for the iOS client's APNs rotation
+ * loop, and the `/api/auth/me/...` path is built for the settings-
+ * surface listing. Two URLs, one implementation: the underlying
+ * Prisma calls are identical to keep the audit trail consistent.
+ */
+import { NextRequest } from "next/server";
+import { apiHandler, requireAuth } from "@/lib/api-handler";
+import { apiError, apiSuccess } from "@/lib/api-response";
+import { annotate } from "@/lib/logging/context";
+import { auditLog } from "@/lib/auth/audit";
+import { prisma } from "@/lib/db";
+
+interface RouteContext {
+  params: Promise<{ id: string }>;
+}
+
+export const DELETE = apiHandler(
+  async (_request: NextRequest, context: RouteContext) => {
+    const { user } = await requireAuth();
+    const { id } = await context.params;
+
+    const device = await prisma.device.findUnique({
+      where: { id },
+      select: { id: true, userId: true, model: true, bundleId: true },
+    });
+
+    if (!device || device.userId !== user.id) {
+      return apiError("Device not found", 404);
+    }
+
+    const liveRefreshTokens = await prisma.refreshToken.findMany({
+      where: { userId: user.id, deviceId: device.id, revokedAt: null },
+      select: { accessTokenHash: true },
+    });
+    const revokedAt = new Date();
+    await prisma.refreshToken.updateMany({
+      where: { userId: user.id, deviceId: device.id, revokedAt: null },
+      data: { revokedAt },
+    });
+    const accessHashes = liveRefreshTokens
+      .map((r) => r.accessTokenHash)
+      .filter((v): v is string => Boolean(v));
+    if (accessHashes.length > 0) {
+      await prisma.apiToken.updateMany({
+        where: { tokenHash: { in: accessHashes }, revoked: false },
+        data: { revoked: true },
+      });
+    }
+
+    await prisma.device.delete({ where: { id: device.id } });
+
+    await auditLog("devices.revoke", {
+      userId: user.id,
+      details: {
+        deviceId: device.id,
+        label: device.model ?? device.bundleId ?? null,
+        refreshTokensRevoked: liveRefreshTokens.length,
+        accessTokensRevoked: accessHashes.length,
+        via: "ios.rotation",
+      },
+    });
+    annotate({
+      action: { name: "devices.revoke", entity_type: "device", entity_id: device.id },
+      meta: {
+        refresh_tokens_revoked: liveRefreshTokens.length,
+        access_tokens_revoked: accessHashes.length,
+      },
+    });
+
+    return apiSuccess({
+      id: device.id,
+      revoked: true,
+      refreshTokensRevoked: liveRefreshTokens.length,
+      accessTokensRevoked: accessHashes.length,
+    });
+  },
+);