diff --git a/scnserver/api/handler/compat.go b/scnserver/api/handler/compat.go
index 562483b..d6bc775 100644
--- a/scnserver/api/handler/compat.go
+++ b/scnserver/api/handler/compat.go
@@ -257,7 +257,7 @@ func (h CompatHandler) Info(g *gin.Context) ginresp.HTTPResponse {
 		QuotaMax   int    `json:"quota_max"`
 		IsPro      int    `json:"is_pro"`
 		FCMSet     bool   `json:"fcm_token_set"`
-		UnackCount int    `json:"unack_count"`
+		UnackCount int64  `json:"unack_count"`
 	}
 
 	var datq query
@@ -309,6 +309,16 @@ func (h CompatHandler) Info(g *gin.Context) ginresp.HTTPResponse {
 		return ginresp.CompatAPIError(0, "Failed to query clients")
 	}
 
+	filter := models.MessageFilter{
+		Owner:              langext.Ptr([]models.UserID{user.UserID}),
+		CompatAcknowledged: langext.Ptr(false),
+	}
+
+	unackCount, err := h.database.CountMessages(ctx, filter)
+	if err != nil {
+		return ginresp.CompatAPIError(0, "Failed to query user")
+	}
+
 	return ctx.FinishSuccess(ginresp.JSON(http.StatusOK, response{
 		Success:    true,
 		Message:    "ok",
@@ -318,7 +328,7 @@ func (h CompatHandler) Info(g *gin.Context) ginresp.HTTPResponse {
 		QuotaMax:   user.QuotaPerDay(),
 		IsPro:      langext.Conditional(user.IsPro, 1, 0),
 		FCMSet:     len(clients) > 0,
-		UnackCount: 0,
+		UnackCount: unackCount,
 	}))
 }
 
diff --git a/scnserver/db/impl/primary/messages.go b/scnserver/db/impl/primary/messages.go
index 96c5902..c234828 100644
--- a/scnserver/db/impl/primary/messages.go
+++ b/scnserver/db/impl/primary/messages.go
@@ -4,6 +4,7 @@ import (
 	ct "blackforestbytes.com/simplecloudnotifier/db/cursortoken"
 	"blackforestbytes.com/simplecloudnotifier/models"
 	"database/sql"
+	"errors"
 	"gogs.mikescher.com/BlackForestBytes/goext/sq"
 	"time"
 )
@@ -149,3 +150,31 @@ func (db *Database) ListMessages(ctx TxContext, filter models.MessageFilter, pag
 		return data[0:*pageSize], outToken, nil
 	}
 }
+
+func (db *Database) CountMessages(ctx TxContext, filter models.MessageFilter) (int64, error) {
+	tx, err := ctx.GetOrCreateTransaction(db)
+	if err != nil {
+		return 0, err
+	}
+
+	filterCond, filterJoin, prepParams, err := filter.SQL()
+
+	sqlQuery := "SELECT " + "COUNT(*)" + " FROM messages " + filterJoin + " WHERE  ( " + filterCond + " ) "
+
+	rows, err := tx.Query(ctx, sqlQuery, prepParams)
+	if err != nil {
+		return 0, err
+	}
+
+	if !rows.Next() {
+		return 0, errors.New("COUNT query returned no results")
+	}
+
+	var countRes int64
+	err = rows.Scan(&countRes)
+	if err != nil {
+		return 0, err
+	}
+
+	return countRes, nil
+}
diff --git a/scnserver/test/compat_test.go b/scnserver/test/compat_test.go
index ded0e71..db5ba9e 100644
--- a/scnserver/test/compat_test.go
+++ b/scnserver/test/compat_test.go
@@ -732,3 +732,90 @@ func TestCompatTitlePatch(t *testing.T) {
 	tt.AssertStrRepEqual(t, "msg.ovrTitle", "[TestChan] HelloWorld_001", pusher.Last().CompatTitleOverride)
 
 }
+
+func TestCompatAckCount(t *testing.T) {
+	_, baseUrl, stop := tt.StartSimpleWebserver(t)
+	defer stop()
+
+	r0 := tt.RequestGet[gin.H](t, baseUrl, fmt.Sprintf("/api/register.php?fcm_token=%s&pro=%s&pro_token=%s", "DUMMY_FCM", "0", ""))
+	tt.AssertEqual(t, "success", true, r0["success"])
+
+	userid := int64(r0["user_id"].(float64))
+	userkey := r0["user_key"].(string)
+
+	{
+		ri1 := tt.RequestGet[gin.H](t, baseUrl, fmt.Sprintf("/api/info.php?user_id=%d&user_key=%s", userid, userkey))
+		tt.AssertEqual(t, "unack_count", 0, ri1["unack_count"])
+	}
+
+	r1 := tt.RequestPost[gin.H](t, baseUrl, "/send.php", tt.FormData{
+		"user_id":  fmt.Sprintf("%d", userid),
+		"user_key": userkey,
+		"title":    "my title 11 & x",
+	})
+	tt.AssertEqual(t, "success", true, r1["success"])
+	r1scnid := int64(r1["scn_msg_id"].(float64))
+
+	{
+		ri1 := tt.RequestGet[gin.H](t, baseUrl, fmt.Sprintf("/api/info.php?user_id=%d&user_key=%s", userid, userkey))
+		tt.AssertEqual(t, "unack_count", 1, ri1["unack_count"])
+	}
+
+	r2 := tt.RequestPost[gin.H](t, baseUrl, "/send.php", tt.FormData{
+		"user_id":  fmt.Sprintf("%d", userid),
+		"user_key": userkey,
+		"title":    "my title 11 & x",
+	})
+	tt.AssertEqual(t, "success", true, r2["success"])
+	r2scnid := int64(r2["scn_msg_id"].(float64))
+
+	{
+		ri1 := tt.RequestGet[gin.H](t, baseUrl, fmt.Sprintf("/api/info.php?user_id=%d&user_key=%s", userid, userkey))
+		tt.AssertEqual(t, "unack_count", 2, ri1["unack_count"])
+	}
+
+	{
+		ack := tt.RequestGet[gin.H](t, baseUrl, fmt.Sprintf("/api/ack.php?user_id=%d&user_key=%s&scn_msg_id=%d", userid, userkey, r1scnid))
+		tt.AssertEqual(t, "success", true, ack["success"])
+		tt.AssertEqual(t, "prev_ack", 0, ack["prev_ack"])
+		tt.AssertEqual(t, "new_ack", 1, ack["new_ack"])
+		tt.AssertEqual(t, "message", "ok", ack["message"])
+	}
+
+	{
+		ri1 := tt.RequestGet[gin.H](t, baseUrl, fmt.Sprintf("/api/info.php?user_id=%d&user_key=%s", userid, userkey))
+		tt.AssertEqual(t, "unack_count", 1, ri1["unack_count"])
+	}
+
+	{
+		ack := tt.RequestGet[gin.H](t, baseUrl, fmt.Sprintf("/api/ack.php?user_id=%d&user_key=%s&scn_msg_id=%d", userid, userkey, r1scnid))
+		tt.AssertEqual(t, "success", true, ack["success"])
+		tt.AssertEqual(t, "prev_ack", 1, ack["prev_ack"])
+		tt.AssertEqual(t, "new_ack", 1, ack["new_ack"])
+		tt.AssertEqual(t, "message", "ok", ack["message"])
+	}
+
+	{
+		ri1 := tt.RequestGet[gin.H](t, baseUrl, fmt.Sprintf("/api/info.php?user_id=%d&user_key=%s", userid, userkey))
+		tt.AssertEqual(t, "unack_count", 1, ri1["unack_count"])
+	}
+
+	{
+		ri1 := tt.RequestGet[gin.H](t, baseUrl, fmt.Sprintf("/api/info.php?user_id=%d&user_key=%s", userid, userkey))
+		tt.AssertEqual(t, "unack_count", 1, ri1["unack_count"])
+	}
+
+	{
+		ack := tt.RequestGet[gin.H](t, baseUrl, fmt.Sprintf("/api/ack.php?user_id=%d&user_key=%s&scn_msg_id=%d", userid, userkey, r2scnid))
+		tt.AssertEqual(t, "success", true, ack["success"])
+		tt.AssertEqual(t, "prev_ack", 0, ack["prev_ack"])
+		tt.AssertEqual(t, "new_ack", 1, ack["new_ack"])
+		tt.AssertEqual(t, "message", "ok", ack["message"])
+	}
+
+	{
+		ri1 := tt.RequestGet[gin.H](t, baseUrl, fmt.Sprintf("/api/info.php?user_id=%d&user_key=%s", userid, userkey))
+		tt.AssertEqual(t, "unack_count", 0, ri1["unack_count"])
+	}
+
+}