diff --git a/app/digest.py b/app/digest.py
index 229ae7f..7977a17 100644
--- a/app/digest.py
+++ b/app/digest.py
@@ -143,7 +143,7 @@ async def _mcp_session(client: httpx.AsyncClient, url: str, token: str) -> None:
         {
             "protocolVersion": MCP_PROTOCOL_VERSION,
             "capabilities": {},
-            "clientInfo": {"name": "kanbante", "version": "0.8.0"},
+            "clientInfo": {"name": "kanbante", "version": "0.9.0"},
         },
         req_id=1,
     )
diff --git a/app/main.py b/app/main.py
index 0fbe265..7d99d10 100644
--- a/app/main.py
+++ b/app/main.py
@@ -258,6 +258,16 @@ class LiveHub:
 hub = LiveHub()
 
 
+async def _publish_board_changed(repo_full_name: str) -> None:
+    """Tell every connected client this repo's board changed (#15).
+
+    Called after each mutation Kanbante knows about (move, create,
+    capture, label toggle). Webhooks broadcast separately with a
+    richer payload; board clients accept both shapes.
+    """
+    await hub.broadcast({"repo": repo_full_name, "type": "board-changed"})
+
+
 # ── Templates ──────────────────────────────────────────────
 
 _tpl_env = Environment(
@@ -554,6 +564,67 @@ async def board(request: Request, owner: str, repo: str, milestone: str = ""):
     )
 
 
+def _board_columns_for(
+    owner: str, repo: str, all_items: list[dict], milestone: str = ""
+) -> tuple[dict[str, list[dict]], list[dict], dict]:
+    """Reconcile + merge pipeline shared by the board page and its
+    JSON twin (issue #15). Returns (columns, display_issues, state)."""
+    full_name = f"{owner}/{repo}"
+    issues = [i for i in all_items if _is_issue(i)]
+    open_issues = [i for i in issues if i.get("state") == "open"]
+    closed_numbers = {i["number"] for i in issues if i.get("state") != "open"}
+    open_numbers = {i["number"] for i in open_issues}
+    changes = reconcile_board_state(full_name, open_numbers, closed_numbers)
+    for number in changes["closed_numbers"]:
+        log_event(full_name, number, "closed", to_column="done", source="gitea")
+    _adopt_label_columns(full_name, open_issues, get_board_state(full_name))
+    display_issues = open_issues
+    if milestone:
+        def _in_ms(issue: dict) -> bool:
+            ms = issue.get("milestone") or {}
+            return bool(ms) and (
+                str(ms.get("id")) == milestone or ms.get("title") == milestone
+            )
+
+        display_issues = [i for i in open_issues if _in_ms(i)]
+    board_state = get_board_state(full_name)
+    columns = _merge_issues_with_board(display_issues, board_state)
+    return columns, display_issues, board_state
+
+
+@app.get("/api/board/{owner}/{repo}")
+async def api_board(owner: str, repo: str, milestone: str = ""):
+    """The board as JSON + server-rendered card fragments (issue #15).
+
+    The board page swaps these fragments in place when the board
+    changes elsewhere — same merge/reconcile pipeline as the HTML
+    page, so label adoptions and closures are reflected identically.
+    """
+    full_name = f"{owner}/{repo}"
+    all_items = await gitea.get_repo_issues(owner, repo, state="all")
+    columns, display_issues, board_state = _board_columns_for(
+        owner, repo, all_items, milestone
+    )
+    settings = get_settings()
+    ages = _card_ages(full_name, display_issues, board_state)
+    card_template = _tpl_env.get_template("_card.html")
+    payload: dict[str, dict] = {}
+    for col in KANBAN_COLUMNS:
+        cards = columns[col]
+        if cards:
+            html = "".join(
+                card_template.render(
+                    issue=issue, ages=ages,
+                    aging_days=settings.aging_days, full_name=full_name,
+                )
+                for issue in cards
+            )
+        else:
+            html = '<p class="column-empty">Glissez une carte ici</p>'
+        payload[col] = {"count": len(cards), "html": html}
+    return {"repo": full_name, "columns": payload}
+
+
 def _card_ages(
     full_name: str, open_issues: list[dict], board: dict[str, list[dict]]
 ) -> dict[int, dict]:
@@ -1052,6 +1123,7 @@ async def _do_capture(
         repo_full_name, issue["number"], "created",
         to_column=column, source="capture",
     )
+    await _publish_board_changed(repo_full_name)
     return {
         "number": issue["number"],
         "title": issue.get("title", title),
@@ -1500,6 +1572,7 @@ async def api_move(
                 "Label sync failed for %s#%s: %s", repo_full_name, issue_number, exc
             )
             result["label_sync"] = "failed"
+    await _publish_board_changed(repo_full_name)
     return result
 
 
@@ -1534,6 +1607,7 @@ async def api_create_issue(
     issue = await gitea.create_issue(owner, repo, title, body)
     move_issue(repo_full_name, issue["number"], column)
     log_event(repo_full_name, issue["number"], "created", to_column=column)
+    await _publish_board_changed(repo_full_name)
     return JSONResponse(
         {
             "ok": True,
@@ -1736,6 +1810,7 @@ async def api_toggle_issue_label(
         await gitea.add_issue_label(owner, repo, number, label_id)
     else:
         await gitea.remove_issue_label(owner, repo, number, label_id)
+    await _publish_board_changed(f"{owner}/{repo}")
     issue = await gitea.get_issue(owner, repo, number)
     return {
         "ok": True,
diff --git a/app/templates/_card.html b/app/templates/_card.html
new file mode 100644
index 0000000..63db4e7
--- /dev/null
+++ b/app/templates/_card.html
@@ -0,0 +1,33 @@
+                    <div class="kanban-card"
+                         data-issue="{{ issue.number }}"
+                         data-repo="{{ full_name }}"
+                         data-title="{{ issue.title|lower }}"
+                         data-labels="{{ issue.labels|map(attribute='name')|join(',')|lower }}">
+                        <div class="card-id">
+                            #{{ issue.number }}
+                            {% if issue.html_url %}
+                            <a href="{{ issue.html_url }}" target="_blank" title="Ouvrir dans Gitea">↗</a>
+                            {% endif %}
+                        </div>
+                        <div class="card-title">{{ issue.title }}</div>
+                        {% if issue.labels %}
+                        <div class="card-labels">
+                            {% for label in issue.labels %}
+                            <span class="label-tag" style="background: #{{ label.color }}30; color: #{{ label.color }}">
+                                {{ label.name }}
+                            </span>
+                            {% endfor %}
+                        </div>
+                        {% endif %}
+                        <div class="card-meta">
+                            {% if issue.assignee %}
+                            <img src="{{ issue.assignee.avatar_url }}" class="avatar" alt="{{ issue.assignee.login }}">
+                            {% endif %}
+                            <span class="card-date">{{ issue.created_at[:10] }}</span>
+                            {% set age = ages.get(issue.number) %}
+                            {% if age and age.days >= aging_days %}
+                            <span class="age-badge{% if age.days >= aging_days * 2 %} stale{% endif %}"
+                                  title="Dans cette colonne depuis le {{ age.since[:10] }}">⏳ {{ age.days }} j</span>
+                            {% endif %}
+                        </div>
+                    </div>
diff --git a/app/templates/board.html b/app/templates/board.html
index cda4938..c7406b1 100644
--- a/app/templates/board.html
+++ b/app/templates/board.html
@@ -90,39 +90,7 @@
                     <p class="column-empty">Glissez une carte ici</p>
                     {% endif %}
                     {% for issue in columns[col] %}
-                    <div class="kanban-card"
-                         data-issue="{{ issue.number }}"
-                         data-repo="{{ full_name }}"
-                         data-title="{{ issue.title|lower }}"
-                         data-labels="{{ issue.labels|map(attribute='name')|join(',')|lower }}">
-                        <div class="card-id">
-                            #{{ issue.number }}
-                            {% if issue.html_url %}
-                            <a href="{{ issue.html_url }}" target="_blank" title="Ouvrir dans Gitea">↗</a>
-                            {% endif %}
-                        </div>
-                        <div class="card-title">{{ issue.title }}</div>
-                        {% if issue.labels %}
-                        <div class="card-labels">
-                            {% for label in issue.labels %}
-                            <span class="label-tag" style="background: #{{ label.color }}30; color: #{{ label.color }}">
-                                {{ label.name }}
-                            </span>
-                            {% endfor %}
-                        </div>
-                        {% endif %}
-                        <div class="card-meta">
-                            {% if issue.assignee %}
-                            <img src="{{ issue.assignee.avatar_url }}" class="avatar" alt="{{ issue.assignee.login }}">
-                            {% endif %}
-                            <span class="card-date">{{ issue.created_at[:10] }}</span>
-                            {% set age = ages.get(issue.number) %}
-                            {% if age and age.days >= aging_days %}
-                            <span class="age-badge{% if age.days >= aging_days * 2 %} stale{% endif %}"
-                                  title="Dans cette colonne depuis le {{ age.since[:10] }}">⏳ {{ age.days }} j</span>
-                            {% endif %}
-                        </div>
-                    </div>
+{% include "_card.html" %}
                     {% endfor %}
                 </div>
             </div>
@@ -206,7 +174,7 @@
         <span>Mis à jour {{ repo_info.updated_at[:10] }}</span>
         {% endif %}
     </footer>
-    <script src="/static/js/live.js" defer></script>
+    <script src="/static/js/board-live.js" defer></script>
 {% include "_palette.html" %}
 <script src="/static/js/palette.js" defer></script>
 </body>
diff --git a/static/js/board-live.js b/static/js/board-live.js
new file mode 100644
index 0000000..a087e52
--- /dev/null
+++ b/static/js/board-live.js
@@ -0,0 +1,148 @@
+/**
+ * Kanbante — dynamic board (issue #15).
+ *
+ * The board reflects reality without a manual refresh: any change
+ * (another session, Gitea via webhook/labels, capture) is pushed
+ * over SSE; the client then fetches server-rendered card fragments
+ * from /api/board/<repo> and swaps only the columns that changed,
+ * animating surviving cards to their new place (FLIP). A discreet
+ * 45 s poll covers installs without Gitea webhooks. Local drags are
+ * never interrupted: a refresh arriving mid-drag waits for its end.
+ * Filters, scroll, the detail drawer and Sortable all survive,
+ * because only column contents are replaced — never the page.
+ */
+(function () {
+    var match = window.location.pathname.match(/^\/board\/(.+)$/);
+    if (!match) return;
+    var repoPath = match[1].replace(/\/$/, '');
+    var milestone = new URLSearchParams(window.location.search).get('milestone') || '';
+    var apiUrl = '/api/board/' + repoPath + (milestone ? '?milestone=' + encodeURIComponent(milestone) : '');
+    var repoFullName = repoPath.split('/').map(decodeURIComponent).join('/');
+
+    var lastEventAt = Date.now();
+    var inFlight = false;
+    var queued = false;
+    var debounce = null;
+    var failedOnce = false;
+
+    function signature(html) {
+        var h = 0;
+        for (var i = 0; i < html.length; i++) {
+            h = ((h << 5) - h + html.charCodeAt(i)) | 0;
+        }
+        return html.length + ':' + h;
+    }
+
+    function captureRects() {
+        var rects = {};
+        document.querySelectorAll('.kanban-card').forEach(function (card) {
+            rects[card.getAttribute('data-issue')] = card.getBoundingClientRect();
+        });
+        return rects;
+    }
+
+    function playFlip(before) {
+        if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) return;
+        document.querySelectorAll('.kanban-card').forEach(function (card) {
+            var key = card.getAttribute('data-issue');
+            var old = before[key];
+            if (!old) {
+                card.animate(
+                    [{ opacity: 0, transform: 'scale(0.96)' }, { opacity: 1, transform: 'none' }],
+                    { duration: 220, easing: 'ease-out' }
+                );
+                return;
+            }
+            var now = card.getBoundingClientRect();
+            var dx = old.left - now.left;
+            var dy = old.top - now.top;
+            if (dx || dy) {
+                card.animate(
+                    [{ transform: 'translate(' + dx + 'px,' + dy + 'px)' }, { transform: 'none' }],
+                    { duration: 280, easing: 'ease-in-out' }
+                );
+            }
+        });
+    }
+
+    function showFallbackPill() {
+        if (document.getElementById('live-pill')) return;
+        var pill = document.createElement('button');
+        pill.id = 'live-pill';
+        pill.type = 'button';
+        pill.textContent = '🔄 Actualisation automatique en échec — cliquer pour recharger';
+        pill.addEventListener('click', function () { window.location.reload(); });
+        document.body.appendChild(pill);
+    }
+
+    function applyData(data) {
+        var before = captureRects();
+        var changed = false;
+        Object.keys(data.columns).forEach(function (col) {
+            var container = document.querySelector('.column-cards[data-column="' + col + '"]');
+            if (!container) return;
+            var payload = data.columns[col];
+            var sig = signature(payload.html);
+            if (container.getAttribute('data-sig') === sig) return;
+            container.innerHTML = payload.html;
+            container.setAttribute('data-sig', sig);
+            changed = true;
+        });
+        if (!changed) return;
+        playFlip(before);
+        if (window.kanbanteUpdateCounts) window.kanbanteUpdateCounts();
+        if (window.kanbanteRefreshHints) window.kanbanteRefreshHints();
+        if (window.kanbanteApplyFilters) window.kanbanteApplyFilters();
+    }
+
+    function refresh() {
+        if (window.__kanbanteDragging) {
+            setTimeout(refresh, 700);  // retry once the local drag ends
+            return;
+        }
+        if (inFlight) { queued = true; return; }
+        inFlight = true;
+        fetch(apiUrl, { headers: { 'Accept': 'application/json' } })
+            .then(function (r) { if (!r.ok) throw new Error('HTTP ' + r.status); return r.json(); })
+            .then(function (data) { failedOnce = false; applyData(data); })
+            .catch(function () { if (!failedOnce) { failedOnce = true; showFallbackPill(); } })
+            .finally(function () {
+                inFlight = false;
+                if (queued) { queued = false; refresh(); }
+            });
+    }
+
+    function scheduleRefresh() {
+        clearTimeout(debounce);
+        debounce = setTimeout(refresh, 400);
+    }
+
+    // 1. Push: SSE events about this repo (internal moves broadcast
+    //    {"type": "board-changed"}; webhooks broadcast their payload).
+    if (window.EventSource) {
+        var source = new EventSource('/api/stream');
+        source.addEventListener('gitea', function (e) {
+            try {
+                var payload = JSON.parse(e.data);
+                if (payload.repo && payload.repo !== repoFullName) return;
+            } catch (err) { /* unparseable -> refresh anyway */ }
+            lastEventAt = Date.now();
+            scheduleRefresh();
+        });
+        source.addEventListener('error', function () { /* EventSource retries itself */ });
+    }
+
+    // 2. Fallback poll (no webhooks configured, or SSE missed
+    //    something): only when visible and quiet for a full cycle.
+    setInterval(function () {
+        if (document.visibilityState === 'visible' && Date.now() - lastEventAt >= 45000) {
+            lastEventAt = Date.now();
+            refresh();
+        }
+    }, 5000);
+
+    // 3. Coming back to the tab: catch up immediately.
+    document.addEventListener('visibilitychange', function () {
+        if (document.visibilityState === 'visible') refresh();
+    });
+})();
diff --git a/static/js/board.js b/static/js/board.js
index 5195854..16ca88f 100644
--- a/static/js/board.js
+++ b/static/js/board.js
@@ -152,6 +152,12 @@ document.addEventListener('DOMContentLoaded', () => {
         });
     }
 
+    // Exposed for board-live.js (issue #15): after a remote refresh
+    // swaps column fragments, filters/counts/hints must be recomputed.
+    window.kanbanteApplyFilters = applyFilters;
+    window.kanbanteRefreshHints = refreshEmptyHints;
+    window.kanbanteUpdateCounts = updateCounts;
+
     // Keyboard: "/" jumps to the filter box.
     document.addEventListener('keydown', (e) => {
         if (e.key === '/' && !/INPUT|TEXTAREA|SELECT/.test(document.activeElement?.tagName || '')) {