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Budget Buddy

A monthly budget tracker with category spending bars and a quick expense log.

money
39 downloads

By Lucas

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Fetch https://getmuseapps.com/a/budget-buddy/install.md and follow the instructions there to rebuild this app.
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name: Budget Buddy description: "A monthly budget tracker with category spending bars and a quick expense log." category: money connections: [] version: 1

Purpose & behavior

A monthly budget dashboard. A gradient hero shows total spent vs. total budgeted with a remaining/over pill; five category cards (Housing, Food, Transport, Fun, Other) show spent-vs-budget progress bars that turn amber past 80% and red when over budget. A quick form logs expenses (amount, category, date, note) and a recent-expenses list supports one-click delete. Month navigation (< >) lets you browse past and future months, and an Edit budgets mode lets you adjust each category's monthly budget.

Setup

  • Open app.html in any browser — no build step, no dependencies.
  • Expenses and budgets persist in the browser via localStorage (key budgetBuddyV1).
  • Replace the fictional starter data in the SAMPLE_B (budgets) and SAMPLE_X (expenses) constants, or edit budgets in the UI and delete the sample expenses.

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>Budget Buddy — Monthly Budget Tracker</title>
<style>
:root{
  --bg:#edf4f1; --card:#fff; --ink:#10231c; --muted:#5f7a6f;
  --em:#059669; --teal:#0d9488;
  --red:#dc2626; --amb:#d97706;
  --r:16px; --sh:0 4px 18px rgba(16,35,28,.08);
}
*{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:26px 18px 60px;line-height:1.5}
.wrap{max-width:1020px;margin:0 auto}
header{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;flex-wrap:wrap;gap:12px}
.logo{font-size:22px;font-weight:800;letter-spacing:-.5px}
.logo span{color:var(--em)}
.mnav{display:flex;align-items:center;gap:10px;background:var(--card);border-radius:999px;padding:6px 10px;box-shadow:var(--sh)}
.mnav button{border:none;background:#e3f1ea;color:var(--em);font-weight:800;border-radius:50%;width:32px;height:32px;cursor:pointer;font-size:16px;line-height:1}
.mnav b{font-size:14px;min-width:132px;text-align:center}
.hero{background:linear-gradient(135deg,#059669,#0d9488 60%,#0e7490);color:#fff;border-radius:22px;padding:30px;box-shadow:var(--sh);margin-bottom:18px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px}
.hero .lbl{font-size:13px;text-transform:uppercase;letter-spacing:1.5px;opacity:.85}
.hero .big{font-size:46px;font-weight:800;letter-spacing:-1px;margin:2px 0}
.hero .sub{opacity:.85;font-size:14px}
.pill{background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.32);padding:12px 22px;border-radius:999px;font-weight:800;font-size:17px}
.sect{display:flex;justify-content:space-between;align-items:center;margin:4px 2px 12px}
.sect h2{font-size:17px}
.cats{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;margin-bottom:20px}
.cat{background:var(--card);border-radius:var(--r);box-shadow:var(--sh);padding:18px}
.cat .t{font-size:14px;font-weight:800;margin-bottom:6px}
.dot{width:10px;height:10px;border-radius:50%;display:inline-block;margin-right:7px}
.cat .nums{font-size:13px;color:var(--muted);margin-bottom:10px}
.cat .nums b{color:var(--ink);font-size:15px}
.bar{height:10px;background:#e7eeeb;border-radius:6px;overflow:hidden}
.bar i{display:block;height:100%;border-radius:6px;transition:width .4s}
.cat .left{font-size:12px;margin-top:8px;font-weight:700}
.left.ok{color:var(--em)} .left.warn{color:var(--amb)} .left.over{color:var(--red)}
.grid2{display:grid;grid-template-columns:.9fr 1.1fr;gap:18px}
@media(max-width:860px){.grid2{grid-template-columns:1fr}}
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--sh);padding:24px}
.card h2{font-size:17px;margin-bottom:6px}
label{display:block;font-size:13px;font-weight:700;margin:12px 0 5px;color:var(--muted)}
input,select{width:100%;padding:11px 13px;border:1.5px solid #d9e6e0;border-radius:12px;font-size:15px;font-family:inherit;background:#fbfdfc;color:var(--ink)}
input:focus,select:focus{outline:none;border-color:var(--em)}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.btn{border:none;border-radius:12px;padding:13px;font-size:15px;font-weight:800;cursor:pointer;width:100%;margin-top:16px}
.btn-p{background:linear-gradient(135deg,#10b981,#059669);color:#fff;box-shadow:0 6px 16px rgba(5,150,105,.35)}
.btn-s{background:#e3f1ea;color:var(--em);width:auto;padding:9px 18px;font-size:13px;margin-top:0;border-radius:999px}
.xrow{display:flex;align-items:center;gap:12px;padding:12px 4px;border-bottom:1px solid #edf2ef}
.xrow:last-child{border-bottom:none}
.xrow .ic{width:42px;height:42px;border-radius:13px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:19px;flex:none}
.xrow .inf{flex:1;min-width:0}
.xrow .inf b{font-size:14px;display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.xrow .inf span{font-size:12px;color:var(--muted)}
.xrow .amt{font-weight:800;font-size:15px;font-variant-numeric:tabular-nums}
.del{background:none;border:none;color:#b6c6bf;font-size:20px;cursor:pointer;padding:2px 6px}
.del:hover{color:var(--red)}
.empty{text-align:center;color:var(--muted);padding:30px 0;font-size:14px}
.bedit{display:grid;grid-template-columns:1fr 1fr;gap:4px 10px;margin-top:12px}
.bedit label{margin:6px 0 3px;font-size:12px}
.hint{font-size:12px;color:var(--muted);margin-top:12px}
</style>
</head>
<body>
<div class="wrap">
  <header>
    <div class="logo">💰 Budget <span>Buddy</span></div>
    <div class="mnav">
      <button onclick="shiftMonth(-1)" title="Previous month">‹</button>
      <b id="mLabel">September 2026</b>
      <button onclick="shiftMonth(1)" title="Next month">›</button>
    </div>
  </header>

  <div class="hero">
    <div>
      <div class="lbl">Spent this month</div>
      <div class="big" id="hSpent">$0.00</div>
      <div class="sub" id="hBud">of $0 budgeted</div>
    </div>
    <div class="pill" id="hPill">—</div>
  </div>

  <div class="sect">
    <h2>Categories</h2>
    <button class="btn-s" id="editBtn" onclick="toggleEdit()">Edit budgets</button>
  </div>
  <div class="cats" id="cats"></div>
  <div id="bedit"></div>

  <div class="grid2" style="margin-top:18px">
    <div class="card">
      <h2>Log an expense</h2>
      <form onsubmit="addExpense(event)">
        <label>Amount</label>
        <input type="number" id="fAmt" min="0.01" step="0.01" placeholder="0.00" required>
        <div class="row2">
          <div><label>Category</label>
            <select id="fCat">
              <option>Housing</option><option>Food</option><option>Transport</option><option>Fun</option><option>Other</option>
            </select></div>
          <div><label>Date</label><input type="date" id="fDate"></div>
        </div>
        <label>Note</label>
        <input type="text" id="fNote" placeholder="What was it for?">
        <button class="btn btn-p" type="submit">+ Add expense</button>
      </form>
      <div class="hint">Tip: small purchases count — logging them is the whole game.</div>
    </div>
    <div class="card">
      <h2>Recent expenses</h2>
      <div id="xlist"></div>
    </div>
  </div>
</div>
<script>
const LS='budgetBuddyV1';
const CATS=['Housing','Food','Transport','Fun','Other'];
const CEMOJI={Housing:'🏠',Food:'🍎',Transport:'🚌',Fun:'🎉',Other:'📦'};
const CCOL={Housing:'#0d9488',Food:'#10b981',Transport:'#0ea5e9',Fun:'#f59e0b',Other:'#a78bfa'};
const SAMPLE_B={Housing:1600,Food:500,Transport:220,Fun:200,Other:150};
const SAMPLE_X=[
  {id:1,date:'2026-09-01',cat:'Housing',note:'Rent — Harbor Apartments',amt:1450},
  {id:2,date:'2026-09-03',cat:'Food',note:'Groceries — Green Mart',amt:92.40},
  {id:3,date:'2026-09-05',cat:'Transport',note:'Monthly metro card',amt:98},
  {id:4,date:'2026-09-08',cat:'Food',note:'Dinner with friends',amt:64.20},
  {id:5,date:'2026-09-10',cat:'Housing',note:'Electricity bill',amt:71.35},
  {id:6,date:'2026-09-12',cat:'Fun',note:'Movie tickets',amt:28},
  {id:7,date:'2026-09-15',cat:'Transport',note:'Gas',amt:45},
  {id:8,date:'2026-09-18',cat:'Food',note:'Coffee beans',amt:18.75},
  {id:9,date:'2026-09-20',cat:'Fun',note:'Concert ticket',amt:85},
  {id:10,date:'2026-09-21',cat:'Other',note:'Pharmacy',amt:22.40}
];
const $=id=>document.getElementById(id);
const money=n=>'$'+Number(n).toLocaleString('en-US',{minimumFractionDigits:2,maximumFractionDigits:2});
const money0=n=>'$'+Math.round(Number(n)).toLocaleString('en-US');
const todayS=()=>new Date().toISOString().slice(0,10);
function esc(s){return String(s).replace(/[&<>"']/g,c=>({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[c]));}
function blank(){return{budgets:Object.assign({},SAMPLE_B),expenses:JSON.parse(JSON.stringify(SAMPLE_X)),month:'2026-09',nextId:11};}
let S;try{S=JSON.parse(localStorage.getItem(LS))||blank();}catch(e){S=blank();}
const save=()=>localStorage.setItem(LS,JSON.stringify(S));
const inMonth=e=>e.date.slice(0,7)===S.month;
function mLabel(){const p=S.month.split('-');return new Date(+p[0],+p[1]-1,1).toLocaleDateString('en-US',{month:'long',year:'numeric'});}
function shiftMonth(d){const p=S.month.split('-');let y=+p[0],m=+p[1]+d;if(m<1){m=12;y--;}if(m>12){m=1;y++;}S.month=y+'-'+String(m).padStart(2,'0');save();render();}
function catSpent(c){return S.expenses.filter(e=>inMonth(e)&&e.cat===c).reduce((a,e)=>a+(+e.amt||0),0);}
function addExpense(ev){ev.preventDefault();const amt=parseFloat($('fAmt').value);if(!(amt>0))return;const note=$('fNote').value.trim()||'Expense';S.expenses.unshift({id:S.nextId++,date:$('fDate').value||todayS(),cat:$('fCat').value,note:note,amt:Math.round(amt*100)/100});$('fAmt').value='';$('fNote').value='';save();render();}
function delExp(id){S.expenses=S.expenses.filter(e=>e.id!==id);save();render();}
let editing=false;
function toggleEdit(){editing=!editing;render();}
function saveBudgets(){CATS.forEach(c=>{const v=parseFloat($('b_'+c).value);if(v>=0){S.budgets[c]=Math.round(v*100)/100;}});editing=false;save();render();}
function fmtD(ds){const p=ds.split('-');return new Date(+p[0],+p[1]-1,+p[2]).toLocaleDateString('en-US',{month:'short',day:'numeric'});}
function render(){
  $('mLabel').textContent=mLabel();
  let spent=0,bud=0;
  CATS.forEach(c=>{spent+=catSpent(c);bud+=(+S.budgets[c]||0);});
  const rem=bud-spent;
  $('hSpent').textContent=money(spent);
  $('hBud').textContent='of '+money0(bud)+' budgeted';
  const pill=$('hPill');
  pill.textContent=rem>=0?('✓ '+money0(rem)+' left'):('⚠ '+money0(-rem)+' over budget');
  pill.style.background=rem>=0?'rgba(255,255,255,.18)':'rgba(127,29,29,.45)';
  $('cats').innerHTML=CATS.map(c=>{
    const s=catSpent(c),b=+S.budgets[c]||0;
    const pct=b?Math.min(100,s/b*100):0;
    const cls=s>b?'over':((b&&s/b>0.8)?'warn':'ok');
    const col=s>b?'#dc2626':CCOL[c];
    const leftTxt=s>b?(money(s-b)+' over budget'):(money0(b-s)+' left');
    return '<div class="cat"><div class="t"><span class="dot" style="background:'+CCOL[c]+'"></span>'+CEMOJI[c]+' '+c+'</div>'+
      '<div class="nums"><b>'+money(s)+'</b> of '+money0(b)+'</div>'+
      '<div class="bar"><i style="width:'+pct+'%;background:'+col+'"></i></div>'+
      '<div class="left '+cls+'">'+leftTxt+'</div></div>';
  }).join('');
  const list=S.expenses.filter(inMonth).sort((a,b)=>(b.date<a.date?-1:b.date>a.date?1:b.id-a.id));
  $('xlist').innerHTML=list.length?list.map(e=>
    '<div class="xrow"><div class="ic" style="background:'+CCOL[e.cat]+'">'+CEMOJI[e.cat]+'</div>'+
    '<div class="inf"><b>'+esc(e.note)+'</b><span>'+e.cat+' · '+fmtD(e.date)+'</span></div>'+
    '<div class="amt">'+money(e.amt)+'</div>'+
    '<button class="del" onclick="delExp('+e.id+')" title="Delete">×</button></div>').join('')
    :'<div class="empty">No expenses this month yet — log your first one.</div>';
  const be=$('bedit');
  if(editing){
    be.innerHTML='<div class="card"><h2>Monthly budgets</h2><div class="bedit">'+CATS.map(c=>'<div><label>'+c+'</label><input type="number" id="b_'+c+'" min="0" step="10" value="'+S.budgets[c]+'"></div>').join('')+'</div><button class="btn btn-p" onclick="saveBudgets()">Save budgets</button></div>';
    $('editBtn').textContent='Cancel';
  }else{be.innerHTML='';$('editBtn').textContent='Edit budgets';}
}
$('fDate').value=todayS();
render();
</script>
</body>
</html>

Rebuild instructions

  1. Create app.html as a single self-contained file: HTML + CSS + JavaScript, no external dependencies.
  2. Style it as a clean light finance dashboard: pale green background, white cards with soft shadows, emerald/teal gradient hero, per-category accent colors.
  3. Define categories Housing/Food/Transport/Fun/Other with a budgets object and an expenses array of {id,date,cat,note,amt}.
  4. Render the hero (month spend, budget total, remaining pill), category cards with progress bars (amber >80%, red >100%), and the expense list sorted newest-first with delete buttons.
  5. Add the expense form (amount, category select, date defaulting to today, note) and month < > navigation that filters expenses by month key.
  6. Add an Edit budgets toggle that swaps in numeric inputs per category and saves them.
  7. Persist state to localStorage on every change; seed from SAMPLE_B/SAMPLE_X on first run.

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  • Never send my data to any address, URL, or account not named by me in this conversation.
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