diff --git a/Subsurface-mobile.pro b/Subsurface-mobile.pro
index d7218a0c6..3559a9be4 100644
--- a/Subsurface-mobile.pro
+++ b/Subsurface-mobile.pro
@@ -128,7 +128,6 @@ SOURCES += subsurface-mobile-main.cpp \
 	core/subsurface-qt/divelistnotifier.cpp \
 	backend-shared/exportfuncs.cpp \
 	backend-shared/plannershared.cpp \
-	backend-shared/roundrectitem.cpp \
 	qt-quick/chartitem.cpp \
 	qt-quick/chartview.cpp \
 	stats/statsvariables.cpp \
@@ -179,8 +178,8 @@ SOURCES += subsurface-mobile-main.cpp \
 	profile-widget/animationfunctions.cpp \
 	profile-widget/divepixmapcache.cpp \
 	profile-widget/divepixmapitem.cpp \
-	profile-widget/divetooltipitem.cpp \
 	profile-widget/tankitem.cpp \
+	profile-widget/tooltipitem.cpp \
 	profile-widget/divelineitem.cpp \
 	profile-widget/diverectitem.cpp \
 	profile-widget/divetextitem.cpp \
@@ -287,7 +286,6 @@ HEADERS += \
 	core/subsurface-qt/divelistnotifier.h \
 	backend-shared/exportfuncs.h \
 	backend-shared/plannershared.h \
-	backend-shared/roundrectitem.h \
 	qt-quick/chartitem.h \
 	qt-quick/chartitemhelper.h \
 	qt-quick/chartitem_ptr.h \
@@ -340,8 +338,8 @@ HEADERS += \
 	profile-widget/diveprofileitem.h \
 	profile-widget/profilescene.h \
 	profile-widget/diveeventitem.h \
-	profile-widget/divetooltipitem.h \
 	profile-widget/tankitem.h \
+	profile-widget/tooltipitem.h \
 	profile-widget/animationfunctions.h \
 	profile-widget/divecartesianaxis.h \
 	profile-widget/divelineitem.h \
diff --git a/backend-shared/CMakeLists.txt b/backend-shared/CMakeLists.txt
index 736b03279..fdfdb1e05 100644
--- a/backend-shared/CMakeLists.txt
+++ b/backend-shared/CMakeLists.txt
@@ -5,8 +5,6 @@ set(BACKEND_SRCS
 	exportfuncs.h
 	plannershared.cpp
 	plannershared.h
-	roundrectitem.cpp
-	roundrectitem.h
 )
 
 add_library(subsurface_backend_shared STATIC ${BACKEND_SRCS})
diff --git a/backend-shared/roundrectitem.cpp b/backend-shared/roundrectitem.cpp
deleted file mode 100644
index 52200b017..000000000
--- a/backend-shared/roundrectitem.cpp
+++ /dev/null
@@ -1,22 +0,0 @@
-#include "roundrectitem.h"
-#include <QPainter>
-#include <QStyleOptionGraphicsItem>
-
-RoundRectItem::RoundRectItem(double radius, QGraphicsItem *parent) : QGraphicsRectItem(parent),
-	radius(radius)
-{
-}
-
-RoundRectItem::RoundRectItem(double radius) : RoundRectItem(radius, nullptr)
-{
-}
-
-void RoundRectItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *)
-{
-	painter->save();
-	painter->setClipRect(option->rect);
-	painter->setPen(pen());
-	painter->setBrush(brush());
-	painter->drawRoundedRect(rect(), radius, radius, Qt::AbsoluteSize);
-	painter->restore();
-}
diff --git a/backend-shared/roundrectitem.h b/backend-shared/roundrectitem.h
deleted file mode 100644
index b8cb3f89b..000000000
--- a/backend-shared/roundrectitem.h
+++ /dev/null
@@ -1,16 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#ifndef ROUNDRECTITEM_H
-#define ROUNDRECTITEM_H
-
-#include <QGraphicsRectItem>
-
-class RoundRectItem : public QGraphicsRectItem {
-public:
-	RoundRectItem(double radius, QGraphicsItem *parent);
-	RoundRectItem(double radius);
-private:
-	void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
-	double radius;
-};
-
-#endif
diff --git a/profile-widget/CMakeLists.txt b/profile-widget/CMakeLists.txt
index 9804f1189..5cd28655f 100644
--- a/profile-widget/CMakeLists.txt
+++ b/profile-widget/CMakeLists.txt
@@ -20,14 +20,15 @@ set(SUBSURFACE_PROFILE_LIB_SRCS
 	diverectitem.h
 	divetextitem.cpp
 	divetextitem.h
-	divetooltipitem.cpp
-	divetooltipitem.h
 	profilescene.cpp
 	profilescene.h
+	profiletranslations.h
 	profileview.cpp
 	profileview.h
 	tankitem.cpp
 	tankitem.h
+	tooltipitem.h
+	tooltipitem.cpp
 )
 if (SUBSURFACE_TARGET_EXECUTABLE MATCHES "MobileExecutable")
 set(SUBSURFACE_PROFILE_LIB_SRCS
diff --git a/profile-widget/profilescene.cpp b/profile-widget/profilescene.cpp
index 8c7f56652..0886a110a 100644
--- a/profile-widget/profilescene.cpp
+++ b/profile-widget/profilescene.cpp
@@ -162,6 +162,11 @@ ProfileScene::~ProfileScene()
 {
 }
 
+const plot_info &ProfileScene::getPlotInfo() const
+{
+	return plotInfo;
+}
+
 void ProfileScene::clear()
 {
 	for (AbstractProfilePolygonItem *item: profileItems)
@@ -613,3 +618,8 @@ double ProfileScene::calcZoomPosition(double zoom, double originalPos, double de
 	double newPos = newRelStart / factor;
 	return std::clamp(newPos, 0.0, 1.0);
 }
+
+int ProfileScene::timeAt(QPointF pos) const
+{
+	return lrint(timeAxis->valueAt(pos));
+}
diff --git a/profile-widget/profilescene.h b/profile-widget/profilescene.h
index 566a92cb1..960bfdb64 100644
--- a/profile-widget/profilescene.h
+++ b/profile-widget/profilescene.h
@@ -48,6 +48,8 @@ public:
 		  const struct dive *d, int dc,
 		  DivePlannerPointsModel *plannerModel = nullptr, bool inPlanner = false);
 	double calcZoomPosition(double zoom, double originalPos, double delta);
+	const plot_info &getPlotInfo() const;
+	int timeAt(QPointF pos) const;
 
 	const struct dive *d;
 	int dc;
diff --git a/profile-widget/profiletranslations.h b/profile-widget/profiletranslations.h
new file mode 100644
index 000000000..d95d8e6c8
--- /dev/null
+++ b/profile-widget/profiletranslations.h
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0
+// Dummy object for profile-module related translations
+
+#ifndef PROFILE_TRANSLATIONS_H
+#define PROFILE_TRANSLATIONS_H
+
+#include <QObject>
+
+class ProfileTranslations : public QObject
+{
+	Q_OBJECT
+};
+
+#endif
diff --git a/profile-widget/profileview.cpp b/profile-widget/profileview.cpp
index 2f1f5f6cc..2b49cfe4b 100644
--- a/profile-widget/profileview.cpp
+++ b/profile-widget/profileview.cpp
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 #include "profileview.h"
 #include "profilescene.h"
+#include "tooltipitem.h"
 #include "zvalues.h"
 #include "core/dive.h"
 #include "core/divelog.h"
@@ -46,6 +47,7 @@ public:
 ProfileView::ProfileView(QQuickItem *parent) : ChartView(parent, ProfileZValue::Count),
 	d(nullptr),
 	dc(0),
+	dpr(1.0),
 	zoomLevel(1.00),
 	zoomedPosition(0.0),
 	panning(false),
@@ -84,6 +86,7 @@ ProfileView::ProfileView(QQuickItem *parent) : ChartView(parent, ProfileZValue::
 	connect(pp_gas, &qPrefPartialPressureGas::po2Changed, this, &ProfileView::replot);
 
 	setAcceptTouchEvents(true);
+	setAcceptHoverEvents(true);
 }
 
 ProfileView::ProfileView() : ProfileView(nullptr)
@@ -119,6 +122,7 @@ void ProfileView::clear()
 		profileScene->clear();
 	//handles.clear();
 	//gases.clear();
+	tooltip.reset();
 	empty = true;
 	d = nullptr;
 	dc = 0;
@@ -135,7 +139,7 @@ void ProfileView::plotDive(const struct dive *dIn, int dcIn, int flags)
 
 	// We can't create the scene in the constructor, because we can't get the DPR property there. Oh joy!
 	if (!profileScene) {
-		double dpr = std::clamp(property("dpr").toReal(), 0.5, 100.0);
+		dpr = std::clamp(property("dpr").toReal(), 0.5, 100.0);
 		profileScene = std::make_unique<ProfileScene>(dpr, false, false);
 	}
 	// If there was no previously displayed dive, turn off animations
@@ -166,7 +170,6 @@ void ProfileView::plotDive(const struct dive *dIn, int dcIn, int flags)
 	profileItem->draw(size(), background, *profileScene);
 
 	//rulerItem->setVisible(prefs.rulergraph && currentState != PLAN && currentState != EDIT);
-	//toolTipItem->setPlotInfo(profileScene->plotInfo);
 	//rulerItem->setPlotInfo(d, profileScene->plotInfo);
 
 	//if ((currentState == EDIT || currentState == PLAN) && plannerModel) {
@@ -194,6 +197,15 @@ void ProfileView::plotDive(const struct dive *dIn, int dcIn, int flags)
 		report_error("%s", qPrintable(tr("Show NDL / TTS was disabled because of excessive processing time")));
 	}
 
+	if (!tooltip)
+		tooltip = createChartItem<ToolTipItem>(dpr);
+	if (prefs.infobox) {
+		tooltip->setVisible(true);
+		tooltip->update(d, dpr, 0, profileScene->getPlotInfo(), flags & RenderFlags::PlanMode);
+	} else {
+		tooltip->setVisible(false);
+	}
+
 	// Reset animation.
 	if (animSpeed <= 0)
 		animation.reset();
@@ -347,3 +359,23 @@ void ProfileView::pan(double x, double y)
 	if (oldPos != zoomedPosition)
 		plotDive(d, dc, RenderFlags::Instant | RenderFlags::DontRecalculatePlotInfo); // TODO: animations don't work when scrolling
 }
+
+void ProfileView::hoverEnterEvent(QHoverEvent *)
+{
+}
+
+void ProfileView::hoverMoveEvent(QHoverEvent *event)
+{
+	if (!profileScene)
+		return;
+	QPointF pos = event->pos();
+	int time = profileScene->timeAt(pos);
+	bool requires_update = false;
+	if (tooltip) {
+		tooltip->update(d, dpr, time, profileScene->getPlotInfo(), false); // TODO: plan mode
+		requires_update = true;
+	}
+
+	if (requires_update)
+		update();
+}
diff --git a/profile-widget/profileview.h b/profile-widget/profileview.h
index cc5ce255c..5aaf449bc 100644
--- a/profile-widget/profileview.h
+++ b/profile-widget/profileview.h
@@ -8,6 +8,7 @@
 class ChartGraphicsSceneItem;
 class ProfileAnimation;
 class ProfileScene;
+class ToolTipItem;
 
 class ProfileView : public ChartView {
 	Q_OBJECT
@@ -47,6 +48,7 @@ signals:
 private:
 	const struct dive *d;
 	int dc;
+	double dpr;
 	double zoomLevel, zoomLevelPinchStart;
 	double zoomedPosition;	// Position when zoomed: 0.0 = beginning, 1.0 = end.
 	bool panning; // Currently panning.
@@ -64,11 +66,15 @@ private:
 	void replot();
 	void setZoom(double level);
 
+	void hoverEnterEvent(QHoverEvent *event) override;
+	void hoverMoveEvent(QHoverEvent *event) override;
 	void wheelEvent(QWheelEvent *event) override;
 	void mousePressEvent(QMouseEvent *event) override;
 	void mouseMoveEvent(QMouseEvent *event) override;
 	void mouseReleaseEvent(QMouseEvent *event) override;
 
+	ChartItemPtr<ToolTipItem> tooltip;
+
 	// For mobile
 	int getDiveId() const;
 	void setDiveId(int id);
diff --git a/profile-widget/tooltipitem.cpp b/profile-widget/tooltipitem.cpp
new file mode 100644
index 000000000..151fd658d
--- /dev/null
+++ b/profile-widget/tooltipitem.cpp
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "tooltipitem.h"
+#include "profiletranslations.h"
+#include "zvalues.h"
+
+#include "core/color.h"
+#include "core/membuffer.h"
+#include "core/profile.h"
+#include "core/qthelper.h" // for decoMode
+
+#include <cmath>
+#include <QApplication>
+#include <QFontMetrics>
+
+static const int tooltipBorder = 2;
+static const double tooltipBorderRadius = 4.0; // Radius of rounded corners
+
+static QColor tooltipBorderColor(Qt::white);
+static QColor tooltipColor(0, 0, 0, 155);
+static QColor tooltipFontColor(Qt::white);
+
+static QFont makeFont(double dpr)
+{
+	QFont font(qApp->font());
+	if (dpr != 1.0) {
+		int pixelSize = font.pixelSize();
+		if (pixelSize > 0) {
+			pixelSize = lrint(static_cast<double>(pixelSize) * dpr);
+			font.setPixelSize(pixelSize);
+		} else {
+			font.setPointSizeF(font.pointSizeF() * dpr);
+		}
+	}
+	return font;
+}
+
+ToolTipItem::ToolTipItem(ChartView &view, double dpr) :
+	ChartRectItem(view, ProfileZValue::ToolTipItem,
+		      QPen(tooltipBorderColor, tooltipBorder),
+		      QBrush(tooltipColor), tooltipBorderRadius),
+	font(makeFont(dpr)),
+	fm(font),
+	fontHeight(fm.height())
+{
+	title = stringToPixmap(ProfileTranslations::tr("Information"));
+}
+
+QPixmap ToolTipItem::stringToPixmap(const QString &str) const
+{
+	QSize s = fm.size(Qt::TextSingleLine, str);
+	if (s.width() <= 0 || s.height() <= 0)
+		return QPixmap(1,1);
+	QPixmap res(s);
+	res.fill(Qt::transparent);
+	QPainter painter(&res);
+	painter.setFont(font);
+	painter.setPen(tooltipFontColor);
+	painter.drawText(QRect(QPoint(), s), str);
+	return res;
+}
+
+// Split a membuffer into strings, skip empty lines.
+// Return string / width (in pixels) pairs.
+static std::vector<std::pair<QString, int>> split_mb_into_strings(const membuffer &mb, const QFontMetrics &fm)
+{
+	std::vector<std::pair<QString, int>> res;
+	for (size_t i = 0; i < mb.len; ++i) {
+		size_t j;
+		for (j = i; j < mb.len && mb.buffer[j] != '\n'; ++j)
+			;
+		if (j > i) {
+			QString s = QString::fromUtf8(mb.buffer + i, j - i);
+			int width = fm.size(Qt::TextSingleLine, s).width();
+			res.emplace_back(s, width);
+		}
+		i = j; // Note: loop iteration will skip over '\n'
+	}
+	return res;
+}
+
+static QPixmap drawTissues(const plot_info &pInfo, double dpr, int idx, bool inPlanner)
+{
+	QPixmap tissues(16,60);
+	QPainter painter(&tissues);
+	tissues.fill();
+	painter.setPen(QColor(0, 0, 0, 0));
+	painter.setBrush(QColor(LIMENADE1));
+	painter.drawRect(0, 10 + (100 - AMB_PERCENTAGE) / 2, 16, AMB_PERCENTAGE / 2);
+	painter.setBrush(QColor(SPRINGWOOD1));
+	painter.drawRect(0, 10, 16, (100 - AMB_PERCENTAGE) / 2);
+	painter.setBrush(QColor(Qt::red));
+	painter.drawRect(0,0,16,10);
+
+	if (!idx)
+		return tissues;
+
+	const struct plot_data *entry = &pInfo.entry[idx];
+	painter.setPen(QColor(0, 0, 0, 255));
+	if (decoMode(inPlanner) == BUEHLMANN)
+		painter.drawLine(0, lrint(60 - entry->gfline / 2), 16, lrint(60 - entry->gfline / 2));
+	painter.drawLine(0, lrint(60 - AMB_PERCENTAGE * (entry->pressures.n2 + entry->pressures.he) / entry->ambpressure / 2),
+			16, lrint(60 - AMB_PERCENTAGE * (entry->pressures.n2 + entry->pressures.he) / entry->ambpressure /2));
+	painter.setPen(QColor(0, 0, 0, 127));
+	for (int i = 0; i < 16; i++)
+		painter.drawLine(i, 60, i, 60 - entry->percentages[i] / 2);
+
+	if (dpr == 1.0)
+		return tissues;
+
+	// Scale according to DPR
+	int new_width = lrint(tissues.width() * dpr);
+	int new_height = lrint(tissues.width() * dpr);
+	return tissues.scaled(new_width, new_height);
+}
+
+void ToolTipItem::update(const dive *d, double dpr, int time, const plot_info &pInfo, bool inPlanner)
+{
+	struct membufferpp mb;
+
+	int idx = get_plot_details_new(d, &pInfo, time, &mb);
+
+	QPixmap tissues = drawTissues(pInfo, dpr, idx, inPlanner);
+	std::vector<std::pair<QString, int>> strings = split_mb_into_strings(mb, fm);
+
+	//TODO: add event tool tips!
+	//const auto l = scene()->items(pos, Qt::IntersectsItemBoundingRect, Qt::DescendingOrder,
+			//scene()->views().first()->transform());
+	//for (QGraphicsItem *item: l) {
+		//if (!item->toolTip().isEmpty())
+			//addToolTip(item->toolTip(), QPixmap());
+	//}
+
+	width = title.size().width();
+	for (auto &[s,w]: strings)
+		width = std::max(width, static_cast<double>(w));
+	width += tissues.width();
+	width += 6.0 * tooltipBorder;
+
+	height = 4.0 * tooltipBorder + title.height() +
+		std::max((static_cast<double>(strings.size()) + 1.0) * fontHeight,
+			 static_cast<double>(tissues.height()));
+
+	ChartRectItem::resize(QSizeF(width, height));
+	painter->setFont(font);
+	painter->setPen(QPen(tooltipFontColor)); // QPainter uses QPen to set text color!
+	double x = 4.0 * tooltipBorder + tissues.width();
+	double y = 2.0 * tooltipBorder;
+	double titleOffset = (width - title.width()) / 2.0;
+	painter->drawPixmap(lrint(titleOffset), lrint(y), title, 0, 0, title.width(), title.height());
+	y += round(fontHeight);
+	painter->drawPixmap(lrint(2.0 * tooltipBorder), lrint(y), tissues, 0, 0, tissues.width(), tissues.height());
+	y += round(fontHeight);
+	for (auto &[s,w]: strings) {
+		QRectF rect(x, y, w, fontHeight);
+		painter->drawText(rect, s);
+		y += fontHeight;
+	}
+	setTextureDirty();
+}
diff --git a/profile-widget/tooltipitem.h b/profile-widget/tooltipitem.h
new file mode 100644
index 000000000..7a8643dac
--- /dev/null
+++ b/profile-widget/tooltipitem.h
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef PROFILE_TOOLTIPITEM_H
+#define PROFILE_TOOLTIPITEM_H
+
+#include "qt-quick/chartitem.h"
+
+#include <QFont>
+#include <QPixmap>
+
+struct dive;
+struct plot_info;
+
+class ToolTipItem : public ChartRectItem {
+public:
+	ToolTipItem(ChartView &view, double dpr);
+	void update(const dive *d, double dpr, int time, const plot_info &pInfo, bool inPlanner);
+private:
+	QFont font;
+	QFontMetrics fm;
+	double fontHeight;
+	QPixmap title;
+	double width, height;
+
+	QPixmap stringToPixmap(const QString &s) const;
+};
+
+
+#endif // PROFILE_TOOLTIPITEM
diff --git a/profile-widget/zvalues.h b/profile-widget/zvalues.h
index 2d3d2989e..a2f16207c 100644
--- a/profile-widget/zvalues.h
+++ b/profile-widget/zvalues.h
@@ -12,6 +12,7 @@
 struct ProfileZValue {
 	enum ZValues {
 		Profile = 0,
+		ToolTipItem,
 		Count
 	};
 };
diff --git a/qt-quick/chartitem.cpp b/qt-quick/chartitem.cpp
index 56278ee28..e63303ed1 100644
--- a/qt-quick/chartitem.cpp
+++ b/qt-quick/chartitem.cpp
@@ -94,6 +94,7 @@ void ChartPixmapItem::resize(QSizeF size)
 		painter->setRenderHint(QPainter::Antialiasing);
 	}
 	rect.setSize(size);
+	setPositionDirty(); // position includes the size.
 	setTextureDirty();
 }