diff --git a/ts/src/stats/GraphsPage.svelte b/ts/src/stats/GraphsPage.svelte
index ed6379bda..d8333ace0 100644
--- a/ts/src/stats/GraphsPage.svelte
+++ b/ts/src/stats/GraphsPage.svelte
@@ -16,6 +16,7 @@
     import CardCounts from "./CardCounts.svelte";
     import HourGraph from "./HourGraph.svelte";
     import FutureDue from "./FutureDue.svelte";
+    import ReviewsGraph from "./ReviewsGraph.svelte";
 
     let sourceData: pb.BackendProto.GraphsOut | null = null;
 
@@ -122,6 +123,7 @@
 </div>
 <div class="range-box-pad" />
 
+<ReviewsGraph {sourceData} />
 <FutureDue {sourceData} />
 <TodayStats {sourceData} />
 <CardCounts {sourceData} />
diff --git a/ts/src/stats/HourGraph.svelte b/ts/src/stats/HourGraph.svelte
index 83de82174..90d1e764d 100644
--- a/ts/src/stats/HourGraph.svelte
+++ b/ts/src/stats/HourGraph.svelte
@@ -23,8 +23,8 @@
     <h1>Hours</h1>
 
     <svg bind:this={svg} viewBox={`0 0 ${bounds.width} ${bounds.height}`}>
-        <path class="area" />
         <g class="bars" />
+        <path class="area" />
         <g class="hoverzone" />
         <AxisTicks {bounds} />
         <AxisLabels {bounds} {xText} {yText} />
diff --git a/ts/src/stats/ReviewsGraph.svelte b/ts/src/stats/ReviewsGraph.svelte
new file mode 100644
index 000000000..a505843ad
--- /dev/null
+++ b/ts/src/stats/ReviewsGraph.svelte
@@ -0,0 +1,68 @@
+<script lang="typescript">
+    import { HistogramData, histogramGraph } from "./histogram-graph";
+    import AxisLabels from "./AxisLabels.svelte";
+    import AxisTicks from "./AxisTicks.svelte";
+    import { defaultGraphBounds } from "./graphs";
+    import { GraphData, gatherData, renderReviews, ReviewRange } from "./reviews";
+    import pb from "../backend/proto";
+
+    export let sourceData: pb.BackendProto.GraphsOut | null = null;
+
+    let graphData: GraphData | null = null;
+
+    let bounds = defaultGraphBounds();
+    let svg = null as HTMLElement | SVGElement | null;
+    let range = ReviewRange.Month;
+    let showTime = false;
+
+    const xText = "";
+    const yText = "Times pressed";
+
+    $: if (sourceData) {
+        console.log("gathering data");
+        graphData = gatherData(sourceData);
+    }
+
+    $: if (graphData) {
+        renderReviews(svg as SVGElement, bounds, graphData, range, showTime);
+    }
+</script>
+
+<div class="graph">
+    <h1>Reviews</h1>
+
+    <div class="range-box-inner">
+        <label>
+            <input type="checkbox" bind:checked={showTime} />
+            Time
+        </label>
+
+        <label>
+            <input type="radio" bind:group={range} value={ReviewRange.Month} />
+            Month
+        </label>
+        <label>
+            <input type="radio" bind:group={range} value={ReviewRange.Quarter} />
+            3 months
+        </label>
+        <label>
+            <input type="radio" bind:group={range} value={ReviewRange.Year} />
+            Year
+        </label>
+        <label>
+            <input type="radio" bind:group={range} value={ReviewRange.AllTime} />
+            All time
+        </label>
+    </div>
+
+    <svg bind:this={svg} viewBox={`0 0 ${bounds.width} ${bounds.height}`}>
+        {#each [4, 3, 2, 1, 0] as i}
+            <g class="bars{i}" />
+        {/each}
+        <path class="area" />
+        <g class="hoverzone" />
+        <AxisTicks {bounds} />
+        <AxisLabels {bounds} {xText} {yText} />
+    </svg>
+
+</div>
diff --git a/ts/src/stats/hours.ts b/ts/src/stats/hours.ts
index 818898506..823ee6551 100644
--- a/ts/src/stats/hours.ts
+++ b/ts/src/stats/hours.ts
@@ -116,6 +116,7 @@ export function renderHours(
                     .attr("x", (d: Hour) => x(d.hour.toString())!)
                     .attr("y", y(0))
                     .attr("height", 0)
+                    .attr("opacity", 0.7)
                     .call(updateBar),
             (update) => update.call(updateBar),
             (remove) =>
diff --git a/ts/src/stats/reviews.ts b/ts/src/stats/reviews.ts
new file mode 100644
index 000000000..1c4ad1b4f
--- /dev/null
+++ b/ts/src/stats/reviews.ts
@@ -0,0 +1,283 @@
+// Copyright: Ankitects Pty Ltd and contributors
+// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
+
+/* eslint
+@typescript-eslint/no-non-null-assertion: "off",
+@typescript-eslint/no-explicit-any: "off",
+ */
+
+import pb from "../backend/proto";
+import {
+    interpolateBlues,
+    interpolateGreens,
+    interpolateReds,
+    interpolateOranges,
+} from "d3-scale-chromatic";
+import "d3-transition";
+import { select, mouse } from "d3-selection";
+import { scaleLinear, scaleSequential } from "d3-scale";
+import { axisBottom, axisLeft } from "d3-axis";
+import { showTooltip, hideTooltip } from "./tooltip";
+import { GraphBounds } from "./graphs";
+import { area, curveBasis } from "d3-shape";
+import { min, histogram, sum, max, Bin, cumsum } from "d3-array";
+
+interface Reviews {
+    mature: number;
+    young: number;
+    learn: number;
+    relearn: number;
+    early: number;
+}
+
+export interface GraphData {
+    // indexed by day, where day is relative to today
+    reviewCount: Map<number, Reviews>;
+    reviewTime: Map<number, Reviews>;
+}
+
+export enum ReviewRange {
+    Month = 0,
+    Quarter = 1,
+    Year = 2,
+    AllTime = 3,
+}
+
+const ReviewKind = pb.BackendProto.RevlogEntry.ReviewKind;
+type BinType = Bin<Map<number, Reviews[]>, number>;
+
+export function gatherData(data: pb.BackendProto.GraphsOut): GraphData {
+    const reviewCount = new Map<number, Reviews>();
+    const reviewTime = new Map<number, Reviews>();
+    const empty = { mature: 0, young: 0, learn: 0, relearn: 0, early: 0 };
+
+    for (const review of data.revlog as pb.BackendProto.RevlogEntry[]) {
+        const day = Math.ceil(
+            ((review.id as number) / 1000 - data.nextDayAtSecs) / 86400
+        );
+        const countEntry =
+            reviewCount.get(day) ?? reviewCount.set(day, { ...empty }).get(day)!;
+        const timeEntry =
+            reviewTime.get(day) ?? reviewTime.set(day, { ...empty }).get(day)!;
+
+        switch (review.reviewKind) {
+            case ReviewKind.REVIEW:
+                if (review.interval < 21) {
+                    countEntry.young += 1;
+                    timeEntry.young += review.takenMillis;
+                } else {
+                    countEntry.mature += 1;
+                    timeEntry.mature += review.takenMillis;
+                }
+                break;
+            case ReviewKind.LEARNING:
+                countEntry.learn += 1;
+                timeEntry.learn += review.takenMillis;
+                break;
+            case ReviewKind.RELEARNING:
+                countEntry.relearn += 1;
+                timeEntry.relearn += review.takenMillis;
+                break;
+            case ReviewKind.EARLY_REVIEW:
+                countEntry.early += 1;
+                timeEntry.early += review.takenMillis;
+                break;
+        }
+    }
+
+    return { reviewCount, reviewTime };
+}
+
+function totalsForBin(bin: BinType): number[] {
+    const total = [0, 0, 0, 0, 0];
+    for (const entry of bin) {
+        total[0] += entry[1].mature;
+        total[1] += entry[1].young;
+        total[2] += entry[1].learn;
+        total[3] += entry[1].relearn;
+        total[4] += entry[1].early;
+    }
+
+    return total;
+}
+
+/// eg idx=0 is mature count, idx=1 is mature+young count, etc
+function cumulativeBinValue(bin: BinType, idx: number): number {
+    return sum(totalsForBin(bin).slice(0, idx + 1));
+}
+
+function tooltipText(d: BinType, cumulative: number): string {
+    return `bin: ${JSON.stringify(totalsForBin(d))}<br>cumulative: ${cumulative}`;
+}
+
+export function renderReviews(
+    svgElem: SVGElement,
+    bounds: GraphBounds,
+    sourceData: GraphData,
+    range: ReviewRange,
+    showTime: boolean
+): void {
+    console.log(sourceData);
+
+    const xMax = 0;
+    let xMin = 0;
+    // cap max to selected range
+    switch (range) {
+        case ReviewRange.Month:
+            xMin = -31;
+            break;
+        case ReviewRange.Quarter:
+            xMin = -90;
+            break;
+        case ReviewRange.Year:
+            xMin = -365;
+            break;
+        case ReviewRange.AllTime:
+            xMin = min(sourceData.reviewCount.keys())!;
+            break;
+    }
+    const desiredBars = Math.min(70, Math.abs(xMin!));
+    console.log(`xmin ${xMin}`);
+
+    const x = scaleLinear().domain([xMin!, xMax]);
+    const sourceMap = showTime ? sourceData.reviewTime : sourceData.reviewCount;
+    const bins = histogram()
+        .value((m) => {
+            return m[0];
+        })
+        .domain(x.domain() as any)
+        .thresholds(x.ticks(desiredBars))(sourceMap.entries() as any);
+
+    const svg = select(svgElem);
+    const trans = svg.transition().duration(600) as any;
+
+    x.range([bounds.marginLeft, bounds.width - bounds.marginRight]);
+    svg.select<SVGGElement>(".x-ticks")
+        .transition(trans)
+        .call(axisBottom(x).ticks(6).tickSizeOuter(0));
+
+    // y scale
+
+    const yMax = max(bins, (b: Bin<any, any>) => cumulativeBinValue(b, 4))!;
+    console.log(`ymax ${yMax}`);
+    const y = scaleLinear()
+        .range([bounds.height - bounds.marginBottom, bounds.marginTop])
+        .domain([0, yMax]);
+    svg.select<SVGGElement>(".y-ticks")
+        .transition(trans)
+        .call(
+            axisLeft(y)
+                .ticks(bounds.height / 80)
+                .tickSizeOuter(0)
+        );
+
+    // x bars
+
+    function barWidth(d: any): number {
+        const width = Math.max(0, x(d.x1) - x(d.x0) - 1);
+        return width ? width : 0;
+    }
+
+    const cappedRange = scaleLinear().range([0.2, 0.5]);
+    const shiftedRange = scaleLinear().range([0.4, 0.7]);
+    const darkerGreens = scaleSequential((n) =>
+        interpolateGreens(shiftedRange(n))
+    ).domain(x.domain() as any);
+    const lighterGreens = scaleSequential((n) =>
+        interpolateGreens(cappedRange(n))
+    ).domain(x.domain() as any);
+    const blues = scaleSequential((n) => interpolateBlues(cappedRange(n))).domain(
+        x.domain() as any
+    );
+    const reds = scaleSequential((n) => interpolateReds(cappedRange(n))).domain(
+        x.domain() as any
+    );
+    const oranges = scaleSequential((n) => interpolateOranges(cappedRange(n))).domain(
+        x.domain() as any
+    );
+
+    const updateBar = (sel: any, idx: number): any => {
+        return sel
+            .attr("width", barWidth)
+            .transition(trans)
+            .attr("x", (d: any) => x(d.x0))
+            .attr("y", (d: any) => y(cumulativeBinValue(d, idx))!)
+            .attr("height", (d: any) => y(0) - y(cumulativeBinValue(d, idx)))
+            .attr("fill", (d: any) => {
+                switch (idx) {
+                    case 0:
+                        return darkerGreens(d.x0);
+                    case 1:
+                        return lighterGreens(d.x0);
+                    case 2:
+                        return blues(d.x0);
+                    case 3:
+                        return reds(d.x0);
+                    case 4:
+                        return oranges(d.x0);
+                }
+            });
+    };
+
+    for (const barNum of [0, 1, 2, 3, 4]) {
+        svg.select(`g.bars${barNum}`)
+            .selectAll("rect")
+            .data(bins)
+            .join(
+                (enter) =>
+                    enter
+                        .append("rect")
+                        .attr("rx", 1)
+                        .attr("x", (d: any) => x(d.x0))
+                        .attr("y", y(0))
+                        .attr("height", 0)
+                        .call((d) => updateBar(d, barNum)),
+                (update) => update.call((d) => updateBar(d, barNum)),
+                (remove) =>
+                    remove.call((remove) =>
+                        remove.transition(trans).attr("height", 0).attr("y", y(0))
+                    )
+            );
+    }
+
+    // cumulative area
+
+    const areaCounts = bins.map((d: any) => cumulativeBinValue(d, 4));
+    areaCounts.unshift(0);
+    const areaData = cumsum(areaCounts);
+    const yAreaScale = y.copy().domain([0, areaData.slice(-1)[0]]);
+
+    if (bins.length) {
+        svg.select("path.area")
+            .datum(areaData as any)
+            .attr(
+                "d",
+                area()
+                    .curve(curveBasis)
+                    .x((d, idx) => {
+                        if (idx === 0) {
+                            return x(bins[0].x0!);
+                        } else {
+                            return x(bins[idx - 1].x1!);
+                        }
+                    })
+                    .y0(bounds.height - bounds.marginBottom)
+                    .y1((d: any) => yAreaScale(d)) as any
+            );
+    }
+
+    // // hover/tooltip
+    svg.select("g.hoverzone")
+        .selectAll("rect")
+        .data(bins)
+        .join("rect")
+        .attr("x", (d: any) => x(d.x0))
+        .attr("y", () => y(yMax!))
+        .attr("width", barWidth)
+        .attr("height", () => y(0) - y(yMax!))
+        .on("mousemove", function (this: any, d: any, idx) {
+            const [x, y] = mouse(document.body);
+            showTooltip(tooltipText(d, areaData[idx + 1]), x, y);
+        })
+        .on("mouseout", hideTooltip);
+}