diff --git a/IrisCompanion/iris/ContentView.swift b/IrisCompanion/iris/ContentView.swift
index a89accf..21f29e5 100644
--- a/IrisCompanion/iris/ContentView.swift
+++ b/IrisCompanion/iris/ContentView.swift
@@ -16,6 +16,8 @@ struct ContentView: View {
                 .tabItem { Label("BLE", systemImage: "dot.radiowaves.left.and.right") }
             OrchestratorView()
                 .tabItem { Label("Orchestrator", systemImage: "bolt.horizontal.circle") }
+            TodosView()
+                .tabItem { Label("Todos", systemImage: "checklist") }
         }
         .onAppear { orchestrator.start() }
     }
diff --git a/IrisCompanion/iris/Models/TodoItem.swift b/IrisCompanion/iris/Models/TodoItem.swift
new file mode 100644
index 0000000..42cdd9a
--- /dev/null
+++ b/IrisCompanion/iris/Models/TodoItem.swift
@@ -0,0 +1,31 @@
+//
+//  TodoItem.swift
+//  iris
+//
+//  Created by Codex.
+//
+
+import Foundation
+
+struct TodoItem: Identifiable, Codable, Equatable {
+    let id: UUID
+    var title: String
+    var isCompleted: Bool
+    var createdAt: Date
+    var updatedAt: Date
+    var completedAt: Date?
+
+    init(id: UUID = UUID(),
+         title: String,
+         isCompleted: Bool = false,
+         createdAt: Date = Date(),
+         updatedAt: Date = Date(),
+         completedAt: Date? = nil) {
+        self.id = id
+        self.title = title
+        self.isCompleted = isCompleted
+        self.createdAt = createdAt
+        self.updatedAt = updatedAt
+        self.completedAt = completedAt
+    }
+}
diff --git a/IrisCompanion/iris/Models/TodoStore.swift b/IrisCompanion/iris/Models/TodoStore.swift
new file mode 100644
index 0000000..83f4e91
--- /dev/null
+++ b/IrisCompanion/iris/Models/TodoStore.swift
@@ -0,0 +1,116 @@
+//
+//  TodoStore.swift
+//  iris
+//
+//  Created by Codex.
+//
+
+import Foundation
+
+final class TodoStore {
+    private struct Persisted: Codable {
+        var schema: Int?
+        var items: [TodoItem]
+    }
+
+    private let queue = DispatchQueue(label: "iris.todostore.queue")
+    private let fileURL: URL
+    private var items: [TodoItem]
+
+    init(filename: String = "todos_v1.json") {
+        self.fileURL = Self.defaultFileURL(filename: filename)
+        let persisted = Self.load(from: fileURL)
+        self.items = persisted?.items ?? []
+    }
+
+    func snapshot() -> [TodoItem] {
+        queue.sync { items }
+    }
+
+    @discardableResult
+    func add(title: String, now: Date = Date()) -> TodoItem {
+        queue.sync {
+            let item = TodoItem(title: title, createdAt: now, updatedAt: now)
+            items.append(item)
+            save()
+            return item
+        }
+    }
+
+    @discardableResult
+    func updateTitle(id: UUID, title: String, now: Date = Date()) -> TodoItem? {
+        queue.sync {
+            guard let index = items.firstIndex(where: { $0.id == id }) else { return nil }
+            var item = items[index]
+            item.title = title
+            item.updatedAt = now
+            items[index] = item
+            save()
+            return item
+        }
+    }
+
+    @discardableResult
+    func setCompleted(id: UUID, completed: Bool, now: Date = Date()) -> TodoItem? {
+        queue.sync {
+            guard let index = items.firstIndex(where: { $0.id == id }) else { return nil }
+            var item = items[index]
+            item.isCompleted = completed
+            item.updatedAt = now
+            item.completedAt = completed ? now : nil
+            items[index] = item
+            save()
+            return item
+        }
+    }
+
+    func delete(id: UUID) {
+        queue.sync {
+            items.removeAll { $0.id == id }
+            save()
+        }
+    }
+
+    private func save() {
+        let persisted = Persisted(schema: 1, items: items)
+        Self.save(persisted, to: fileURL)
+    }
+
+    private static func defaultFileURL(filename: String) -> URL {
+        let fm = FileManager.default
+        let base = fm.urls(for: .applicationSupportDirectory, in: .userDomainMask).first ?? fm.temporaryDirectory
+        let bundle = Bundle.main.bundleIdentifier ?? "iris"
+        return base
+            .appendingPathComponent(bundle, isDirectory: true)
+            .appendingPathComponent(filename, isDirectory: false)
+    }
+
+    private static func load(from url: URL) -> Persisted? {
+        guard let data = try? Data(contentsOf: url) else { return nil }
+        return try? makeDecoder().decode(Persisted.self, from: data)
+    }
+
+    private static func save(_ persisted: Persisted, to url: URL) {
+        do {
+            let fm = FileManager.default
+            try fm.createDirectory(at: url.deletingLastPathComponent(), withIntermediateDirectories: true)
+            let data = try makeEncoder().encode(persisted)
+            try data.write(to: url, options: [.atomic])
+        } catch {
+            // Best-effort persistence.
+        }
+    }
+
+    private static func makeEncoder() -> JSONEncoder {
+        let encoder = JSONEncoder()
+        encoder.outputFormatting = [.prettyPrinted, .withoutEscapingSlashes]
+        encoder.dateEncodingStrategy = .iso8601
+        return encoder
+    }
+
+    private static func makeDecoder() -> JSONDecoder {
+        let decoder = JSONDecoder()
+        decoder.dateDecodingStrategy = .iso8601
+        return decoder
+    }
+}
diff --git a/IrisCompanion/iris/ViewModels/TodosViewModel.swift b/IrisCompanion/iris/ViewModels/TodosViewModel.swift
new file mode 100644
index 0000000..0b25d0a
--- /dev/null
+++ b/IrisCompanion/iris/ViewModels/TodosViewModel.swift
@@ -0,0 +1,73 @@
+//
+//  TodosViewModel.swift
+//  iris
+//
+//  Created by Codex.
+//
+
+import Foundation
+
+@MainActor
+final class TodosViewModel: ObservableObject {
+    @Published private(set) var todos: [TodoItem] = []
+    @Published var newTitle: String = ""
+
+    private let store: TodoStore
+
+    init(store: TodoStore = TodoStore()) {
+        self.store = store
+        refresh()
+    }
+
+    func refresh() {
+        todos = sortedItems(store.snapshot())
+    }
+
+    func addTodo() {
+        let trimmed = normalizedTitle(newTitle)
+        guard !trimmed.isEmpty else { return }
+        store.add(title: trimmed)
+        newTitle = ""
+        refresh()
+    }
+
+    func deleteTodo(id: UUID) {
+        store.delete(id: id)
+        refresh()
+    }
+
+    func toggleCompleted(id: UUID) {
+        guard let current = todos.first(where: { $0.id == id }) else { return }
+        store.setCompleted(id: id, completed: !current.isCompleted)
+        refresh()
+    }
+
+    func updateTitle(id: UUID, title: String) {
+        let trimmed = normalizedTitle(title)
+        guard !trimmed.isEmpty else { return }
+        store.updateTitle(id: id, title: trimmed)
+        refresh()
+    }
+
+    private func normalizedTitle(_ raw: String) -> String {
+        raw.trimmingCharacters(in: .whitespacesAndNewlines)
+    }
+
+    private func sortedItems(_ items: [TodoItem]) -> [TodoItem] {
+        items.sorted { lhs, rhs in
+            if lhs.isCompleted != rhs.isCompleted {
+                return !lhs.isCompleted
+            }
+            if lhs.isCompleted {
+                let lhsDate = lhs.completedAt ?? lhs.updatedAt
+                let rhsDate = rhs.completedAt ?? rhs.updatedAt
+                if lhsDate != rhsDate {
+                    return lhsDate > rhsDate
+                }
+            } else if lhs.createdAt != rhs.createdAt {
+                return lhs.createdAt > rhs.createdAt
+            }
+            return lhs.id.uuidString < rhs.id.uuidString
+        }
+    }
+}
diff --git a/IrisCompanion/iris/Views/TodosView.swift b/IrisCompanion/iris/Views/TodosView.swift
new file mode 100644
index 0000000..283cc38
--- /dev/null
+++ b/IrisCompanion/iris/Views/TodosView.swift
@@ -0,0 +1,195 @@
+//
+//  TodosView.swift
+//  iris
+//
+//  Created by Codex.
+//
+
+import SwiftUI
+
+struct TodosView: View {
+    @StateObject private var model = TodosViewModel()
+    @State private var isDoneExpanded = false
+    @State private var lastDoneCount = 0
+
+    private var openTodos: [TodoItem] {
+        model.todos.filter { !$0.isCompleted }
+    }
+
+    private var doneTodos: [TodoItem] {
+        model.todos.filter { $0.isCompleted }
+    }
+
+    var body: some View {
+        NavigationStack {
+            List {
+                Section("Add") {
+                    HStack(spacing: 12) {
+                        TextField("Add a todo", text: $model.newTitle)
+                            .textInputAutocapitalization(.sentences)
+                            .disableAutocorrection(false)
+                            .submitLabel(.done)
+                            .onSubmit { model.addTodo() }
+
+                        Button {
+                            model.addTodo()
+                        } label: {
+                            Image(systemName: "plus.circle.fill")
+                                .font(.title3)
+                        }
+                        .buttonStyle(.plain)
+                        .disabled(model.newTitle.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty)
+                        .accessibilityLabel("Add todo")
+                    }
+                }
+
+                Section("Todos") {
+                    if openTodos.isEmpty {
+                        Text("No open todos")
+                            .foregroundStyle(.secondary)
+                    } else {
+                        ForEach(openTodos) { item in
+                            TodoRow(
+                                item: item,
+                                onToggle: { model.toggleCompleted(id: item.id) },
+                                onDelete: { model.deleteTodo(id: item.id) },
+                                onUpdateTitle: { model.updateTitle(id: item.id, title: $0) }
+                            )
+                        }
+                    }
+                }
+
+                Section {
+                    if isDoneExpanded {
+                        if doneTodos.isEmpty {
+                            Text("No completed todos")
+                                .foregroundStyle(.secondary)
+                        } else {
+                            ForEach(doneTodos) { item in
+                                TodoRow(
+                                    item: item,
+                                    onToggle: { model.toggleCompleted(id: item.id) },
+                                    onDelete: { model.deleteTodo(id: item.id) },
+                                    onUpdateTitle: { model.updateTitle(id: item.id, title: $0) }
+                                )
+                            }
+                        }
+                    }
+                } header: {
+                    Button {
+                        withAnimation(.easeInOut(duration: 0.15)) {
+                            isDoneExpanded.toggle()
+                        }
+                    } label: {
+                        HStack(spacing: 8) {
+                            Text("Done")
+                            Spacer()
+                            if doneTodos.count > 0 {
+                                Text("\(doneTodos.count)")
+                                    .foregroundStyle(.secondary)
+                            }
+                            Image(systemName: isDoneExpanded ? "chevron.down" : "chevron.right")
+                                .foregroundStyle(.secondary)
+                                .font(.caption)
+                        }
+                    }
+                    .buttonStyle(.plain)
+                }
+            }
+            .navigationTitle("Todos")
+            .onAppear {
+                lastDoneCount = doneTodos.count
+                if lastDoneCount == 0 {
+                    isDoneExpanded = false
+                }
+            }
+            .onChange(of: doneTodos.count) { newCount in
+                if lastDoneCount == 0, newCount > 0, !isDoneExpanded {
+                    withAnimation(.easeInOut(duration: 0.15)) {
+                        isDoneExpanded = true
+                    }
+                } else if newCount == 0, isDoneExpanded {
+                    withAnimation(.easeInOut(duration: 0.15)) {
+                        isDoneExpanded = false
+                    }
+                }
+                lastDoneCount = newCount
+            }
+        }
+    }
+}
+
+private struct TodoRow: View {
+    let item: TodoItem
+    let onToggle: () -> Void
+    let onDelete: () -> Void
+    let onUpdateTitle: (String) -> Void
+
+    @State private var draftTitle: String
+    @FocusState private var isFocused: Bool
+
+    init(item: TodoItem,
+         onToggle: @escaping () -> Void,
+         onDelete: @escaping () -> Void,
+         onUpdateTitle: @escaping (String) -> Void) {
+        self.item = item
+        self.onToggle = onToggle
+        self.onDelete = onDelete
+        self.onUpdateTitle = onUpdateTitle
+        _draftTitle = State(initialValue: item.title)
+    }
+
+    var body: some View {
+        HStack(spacing: 12) {
+            Button(action: onToggle) {
+                Image(systemName: item.isCompleted ? "checkmark.circle.fill" : "circle")
+                    .foregroundStyle(item.isCompleted ? .secondary : .primary)
+            }
+            .buttonStyle(.plain)
+            .accessibilityLabel(item.isCompleted ? "Mark incomplete" : "Mark complete")
+
+            TextField("Todo", text: $draftTitle)
+                .focused($isFocused)
+                .submitLabel(.done)
+                .onSubmit { commitTitleIfNeeded() }
+                .onChange(of: isFocused) { focused in
+                    if !focused {
+                        commitTitleIfNeeded()
+                    }
+                }
+                .onChange(of: item.title) { newValue in
+                    if !isFocused {
+                        draftTitle = newValue
+                    }
+                }
+                .foregroundStyle(item.isCompleted ? .secondary : .primary)
+                .opacity(item.isCompleted ? 0.7 : 1.0)
+        }
+        .onDisappear {
+            if isFocused {
+                commitTitleIfNeeded()
+            }
+        }
+        .swipeActions(edge: .trailing, allowsFullSwipe: true) {
+            Button(role: .destructive, action: onDelete) {
+                Label("Delete", systemImage: "trash")
+            }
+        }
+    }
+
+    private func commitTitleIfNeeded() {
+        let trimmed = draftTitle.trimmingCharacters(in: .whitespacesAndNewlines)
+        guard !trimmed.isEmpty else {
+            draftTitle = item.title
+            return
+        }
+        guard trimmed != item.title else { return }
+        onUpdateTitle(trimmed)
+    }
+}
+
+struct TodosView_Previews: PreviewProvider {
+    static var previews: some View {
+        TodosView()
+    }
+}