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Habit Streaks

A daily habit tracker with streak counters and a GitHub-style activity heatmap.

other
8 downloads

By Lucas

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name: Habit Streaks description: "A daily habit tracker with streak counters and a GitHub-style activity heatmap." category: other connections: [] version: 1

Purpose & behavior

A daily habit tracker. Each habit has a one-tap check-in button, a live streak counter (consecutive days), a weekly completion percentage with progress bar, and a 12-week GitHub-style activity heatmap rendered as a pure CSS grid. A stats bar shows habit count, longest streak, and today's check-ins. Users can add and delete habits; check-ins persist in the browser via localStorage keyed by date.

Setup

  • Open app.html in any browser — no build step, no dependencies.
  • Replace the sample habits in the SEED array (their history is generated relative to today by seedChecks) with your own via the in-app add form — everything saves automatically.

Source

app.html — the complete app (single self-contained file: HTML, CSS, and JavaScript, no external dependencies):

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Habit Streaks</title>
<style>
  :root{
    --bg:#f7f8fa; --card:#ffffff; --ink:#1f2937; --muted:#8b94a3;
    --green:#40c463; --green-d:#216e39; --green-l:#dcf2e2;
    --c0:#ebedf0; --c1:#9be9a8; --c2:#40c463; --c3:#30a14e; --c4:#216e39;
    --radius:16px; --shadow:0 6px 22px rgba(31,41,55,.07);
  }
  *{box-sizing:border-box;margin:0;padding:0}
  body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
    background:var(--bg);color:var(--ink);padding:28px 16px 70px;line-height:1.5}
  .wrap{max-width:940px;margin:0 auto}
  .hero{background:linear-gradient(135deg,#216e39,#30a14e 60%,#7ed08a);color:#fff;border-radius:24px;
    padding:32px 32px 26px;box-shadow:var(--shadow);margin-bottom:22px}
  .hero h1{font-size:30px;font-weight:800;letter-spacing:-.5px}
  .hero p{opacity:.92;margin-top:6px;font-size:15px}
  .stats{display:flex;gap:12px;margin-top:16px;flex-wrap:wrap}
  .stat{background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.3);border-radius:12px;
    padding:8px 16px;font-size:13px;font-weight:600}
  .stat b{font-size:18px;margin-right:4px}
  .habit{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);
    padding:20px 22px;margin-bottom:14px}
  .habit .top{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
  .habit .name{font-size:17px;font-weight:800}
  .streak{display:inline-flex;align-items:center;gap:6px;background:#fff7e6;color:#b45309;
    border-radius:999px;padding:4px 12px;font-size:13px;font-weight:800}
  .weekpct{font-size:13px;color:var(--muted);font-weight:600}
  .check{margin-left:auto;border:none;border-radius:12px;padding:12px 22px;font-size:15px;font-weight:800;
    cursor:pointer;background:var(--green-l);color:var(--green-d)}
  .check:hover{background:#c9e9d2}
  .check.done{background:var(--green);color:#fff}
  .del{border:none;background:none;color:#c2c8d2;font-size:18px;cursor:pointer;padding:4px 8px}
  .del:hover{color:#c0392b}
  .map{margin-top:14px;overflow-x:auto;padding-bottom:4px}
  .grid{display:grid;grid-template-rows:repeat(7,13px);grid-auto-flow:column;gap:3px;width:max-content}
  .cell{width:13px;height:13px;border-radius:3px;background:var(--c0)}
  .legend{display:flex;align-items:center;gap:4px;margin-top:10px;font-size:11px;color:var(--muted)}
  .addrow{display:flex;gap:8px;margin-top:6px}
  input[type=text]{padding:11px 14px;border:1px solid #dde2ea;border-radius:12px;font-size:14px;flex:1;background:#fff}
  .btn{border:none;border-radius:12px;padding:11px 20px;font-size:14px;font-weight:700;cursor:pointer;
    background:var(--green-d);color:#fff}
  .btn:hover{background:#1a5a2f}
  .empty{color:var(--muted);font-size:14px;text-align:center;padding:20px}
  footer.note{text-align:center;color:var(--muted);font-size:12px;margin-top:30px}
  .bar{height:8px;border-radius:4px;background:#eef1f5;margin-top:10px;overflow:hidden}
  .bar i{display:block;height:100%;background:linear-gradient(90deg,#40c463,#216e39);border-radius:4px}
</style>
</head>
<body>
<div class="wrap">
  <div class="hero">
    <h1>🔥 Habit Streaks</h1>
    <p>Small wins, every day. Check in daily and watch your streaks — and your heatmap — grow.</p>
    <div class="stats">
      <div class="stat"><b id="sHabits">0</b> habits</div>
      <div class="stat"><b id="sStreak">0</b> longest streak</div>
      <div class="stat"><b id="sToday">0</b> done today</div>
    </div>
  </div>

  <div id="habits"></div>

  <div class="addrow">
    <input type="text" id="hName" placeholder="New habit, e.g. Drink water">
    <button class="btn" onclick="addHabit()">+ Add habit</button>
  </div>

  <footer class="note">Sample habits shown — replace them with your own. Everything saves in your browser.</footer>
</div>

<script>
const LS = "habitStreaksV1";
const DAY = 864e5;
const key = d => d.toISOString().slice(0,10);
const todayKey = () => key(new Date());

/* deterministic pseudo-random so the SEED heatmap looks organic but stable */
function prand(i, seed){ let x = (i*2654435761 + seed*40503) % 1000; return x/1000; }

/* ---- SEED: clearly fictional sample habits, history generated relative to today ---- */
function seedChecks(seed, density){
  const c = {}, now = new Date();
  for(let i=0;i<84;i++){
    const d = new Date(now.getTime() - i*DAY);
    if(prand(i, seed) < density) c[key(d)] = true;
  }
  return c;
}
const SEED = [
  {id:1, name:"📖 Read 20 pages",  checks: seedChecks(11, .72)},
  {id:2, name:"🏃 Exercise",        checks: seedChecks(47, .55)},
  {id:3, name:"🧘 Meditate",        checks: seedChecks(83, .64)}
];
/* make sure today is checked for the first habit so the screenshot feels alive */
SEED[0].checks[todayKey()] = true;

let S = JSON.parse(localStorage.getItem(LS) || "null") || {habits: JSON.parse(JSON.stringify(SEED))};
const save = () => localStorage.setItem(LS, JSON.stringify(S));
const esc = s => String(s).replace(/[&<>"']/g, c => ({"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;"}[c]));
const $ = id => document.getElementById(id);

function streakOf(h){
  const t = todayKey();
  let d = new Date(), s = 0;
  if(!h.checks[t]) d = new Date(d.getTime() - DAY); /* streak counts from yesterday if today unchecked */
  while(h.checks[key(d)]){ s++; d = new Date(d.getTime() - DAY); }
  return s;
}
function weekPct(h){
  const now = new Date(); let n = 0;
  for(let i=0;i<7;i++) if(h.checks[key(new Date(now.getTime()-i*DAY))]) n++;
  return Math.round(n/7*100);
}
function heatmap(h){
  const now = new Date(); let cells = "";
  for(let w=11; w>=0; w--){
    for(let dow=0; dow<7; dow++){
      const idx = w*7 + dow;
      const d = new Date(now.getTime() - idx*DAY);
      /* align: oldest week first column; skip future days in the current week */
      const k = key(d);
      const done = !!h.checks[k];
      const future = d > now;
      cells += `<div class="cell" title="${k}${done?" ✓":""}" style="background:${future?"transparent":done?"var(--c3)":"var(--c0)"}"></div>`;
    }
  }
  return `<div class="map"><div class="grid">${cells}</div>
    <div class="legend">Less <div class="cell" style="background:var(--c0)"></div><div class="cell" style="background:var(--c1)"></div><div class="cell" style="background:var(--c2)"></div><div class="cell" style="background:var(--c3)"></div><div class="cell" style="background:var(--c4)"></div> More · last 12 weeks</div></div>`;
}

function render(){
  const t = todayKey();
  $("sHabits").textContent = S.habits.length;
  $("sStreak").textContent = S.habits.reduce((a,h) => Math.max(a, streakOf(h)), 0);
  $("sToday").textContent = S.habits.filter(h => h.checks[t]).length;

  $("habits").innerHTML = S.habits.length ? S.habits.map(h => {
    const st = streakOf(h), pct = weekPct(h), doneToday = !!h.checks[t];
    return `<div class="habit">
      <div class="top">
        <div class="name">${esc(h.name)}</div>
        <span class="streak">🔥 ${st} day${st===1?"":"s"}</span>
        <span class="weekpct">${pct}% this week</span>
        <button class="check${doneToday?" done":""}" onclick="toggle(${h.id})">${doneToday?"✓ Done today":"Check in"}</button>
        <button class="del" onclick="del(${h.id})" title="Delete">×</button>
      </div>
      <div class="bar"><i style="width:${pct}%"></i></div>
      ${heatmap(h)}
    </div>`;
  }).join("") : `<div class="empty">No habits yet — add your first one below.</div>`;
}

window.toggle = id => {
  const h = S.habits.find(x => x.id === id); if(!h) return;
  const t = todayKey();
  if(h.checks[t]) delete h.checks[t]; else h.checks[t] = true;
  save(); render();
};
window.addHabit = () => {
  const name = $("hName").value.trim(); if(!name){ alert("Name your habit"); return; }
  S.habits.push({id:Date.now(), name, checks:{}});
  $("hName").value=""; save(); render();
};
window.del = id => { S.habits = S.habits.filter(x => x.id !== id); save(); render(); };

render();
</script>
</body>
</html>

Rebuild instructions

  1. Create app.html with the full source below: clean minimal theme, green gradient hero with stat pills, habit cards with streak badge, check-in button, weekly progress bar, and 12-week heatmap grid.
  2. Implement state {habits: [{id, name, checks}]} persisted under localStorage key habitStreaksV1; seed sample habits with seedChecks(seed, density) generating 84 days of history relative to today.
  3. Implement streakOf (consecutive days ending today/yesterday), weekPct (last-7-day completion), heatmap (12×7 CSS grid), toggle, addHabit, del.
  4. Open app.html in a browser and verify checking in today increments the streak and fills today's heatmap cell.

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