Tip Splitter

name: Tip Splitter description: "Splits a restaurant bill fairly with tip, across any number of people." category: money connections: [] version: 1

Purpose & behavior

A bill-splitting calculator. Enter the bill amount, pick a tip percentage from the 10/15/20/25% chips (or type a custom percentage), and set how many people are splitting it with a stepper. It instantly shows the tip amount, the grand total, and the per-person share, with an optional "round up per-person total" toggle for when everyone wants to pay a clean number instead of splitting change.

Setup

Open app.html in any browser — no build step, no dependencies.
Nothing persists between visits; every field resets to its default when the page reloads.

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>Tip Splitter</title>
<style>
:root{
  --bg1:#062f2e; --bg2:#0a4b45; --bg3:#0f766e;
  --card:rgba(255,255,255,.06); --card2:rgba(255,255,255,.1);
  --brd:rgba(255,255,255,.14);
  --ink:#ecfdf5; --muted:#8fb8ae;
  --acc:#2dd4bf; --acc2:#5eead4;
  --r:18px; --sh:0 10px 30px rgba(0,0,0,.35);
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:radial-gradient(1100px 700px at 15% -10%,var(--bg3),transparent),
             radial-gradient(900px 700px at 110% 110%,#134e4a,transparent),
             linear-gradient(160deg,var(--bg1),var(--bg2));
  color:var(--ink);min-height:100vh;padding:32px 18px 60px;display:flex;justify-content:center}
.wrap{max-width:440px;width:100%}
header{text-align:center;margin-bottom:22px}
.logo{font-size:24px;font-weight:800;letter-spacing:-.5px}
.logo span{background:linear-gradient(90deg,var(--acc2),var(--acc));-webkit-background-clip:text;background-clip:text;color:transparent}
.sub{color:var(--muted);font-size:13px;margin-top:4px}
.card{background:var(--card);border:1px solid var(--brd);border-radius:var(--r);box-shadow:var(--sh);padding:26px;backdrop-filter:blur(10px);margin-bottom:16px}
label{display:block;font-size:12px;text-transform:uppercase;letter-spacing:1px;color:var(--muted);margin-bottom:8px}
.field{margin-bottom:20px}
.amtrow{display:flex;align-items:center;background:rgba(0,0,0,.3);border:1px solid var(--brd);border-radius:12px;padding:4px 14px}
.amtrow span{font-size:20px;color:var(--muted);margin-right:6px}
.amtrow input{flex:1;background:transparent;border:none;color:var(--ink);font-size:26px;font-weight:700;padding:10px 0;outline:none;font-variant-numeric:tabular-nums}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{flex:1;border:1px solid var(--brd);background:var(--card2);color:var(--ink);border-radius:12px;padding:10px;font-size:14px;font-weight:700;cursor:pointer;text-align:center;min-width:64px}
.chip.on{background:linear-gradient(135deg,var(--acc),#0d9488);color:#052e2b;border-color:transparent}
.custom{display:flex;gap:6px;align-items:center;margin-top:8px}
.custom input{width:100%;background:rgba(0,0,0,.3);border:1px solid var(--brd);color:var(--ink);border-radius:10px;padding:9px 12px;font-size:14px}
.stepper{display:flex;align-items:center;gap:14px;background:rgba(0,0,0,.3);border:1px solid var(--brd);border-radius:12px;padding:6px 10px}
.stepper button{width:38px;height:38px;border-radius:9px;border:none;background:var(--card2);color:var(--ink);font-size:18px;font-weight:800;cursor:pointer}
.stepper button:hover{background:rgba(255,255,255,.22)}
.stepper .n{flex:1;text-align:center;font-size:20px;font-weight:700}
.results{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.result{text-align:center;padding:14px 6px;border-radius:14px;background:rgba(0,0,0,.2);border:1px solid var(--brd)}
.result .v{font-size:22px;font-weight:800;font-variant-numeric:tabular-nums}
.result .l{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:1px;margin-top:4px}
.hero{text-align:center;padding:22px 10px;border-radius:16px;background:linear-gradient(135deg,rgba(45,212,191,.18),rgba(94,234,212,.06));border:1px solid rgba(45,212,191,.35);margin-bottom:16px}
.hero .v{font-size:40px;font-weight:800;background:linear-gradient(90deg,#fff,var(--acc2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .l{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:1.5px;margin-top:4px}
.roundrow{display:flex;align-items:center;justify-content:space-between;margin-top:16px}
.roundrow span{font-size:13px;color:var(--muted)}
.toggle{width:42px;height:24px;border-radius:999px;background:rgba(0,0,0,.35);border:1px solid var(--brd);position:relative;cursor:pointer;flex:none}
.toggle .dot{position:absolute;top:2px;left:2px;width:18px;height:18px;border-radius:50%;background:var(--muted);transition:.15s}
.toggle.on{background:rgba(45,212,191,.35);border-color:var(--acc)}
.toggle.on .dot{left:22px;background:var(--acc2)}
</style>
</head>
<body>
<div class="wrap">
  <header>
    <div class="logo">💸 Tip <span>Splitter</span></div>
    <div class="sub">Split any bill fairly, tip included</div>
  </header>

  <div class="card">
    <div class="field">
      <label for="bill">Bill amount</label>
      <div class="amtrow"><span>$</span><input type="number" id="bill" min="0" step="0.01" value="86.40" inputmode="decimal"></div>
    </div>

    <div class="field">
      <label>Tip percentage</label>
      <div class="chips" id="tipChips">
        <button class="chip" data-t="10" onclick="setTip(10)">10%</button>
        <button class="chip" data-t="15" onclick="setTip(15)">15%</button>
        <button class="chip on" data-t="20" onclick="setTip(20)">20%</button>
        <button class="chip" data-t="25" onclick="setTip(25)">25%</button>
      </div>
      <div class="custom"><input type="number" id="customTip" min="0" max="100" placeholder="Custom % …" oninput="setTip(parseFloat(this.value)||0,true)"></div>
    </div>

    <div class="field">
      <label>Split between</label>
      <div class="stepper">
        <button onclick="stepPeople(-1)">−</button>
        <div class="n"><span id="people">4</span> people</div>
        <button onclick="stepPeople(1)">+</button>
      </div>
    </div>

    <div class="roundrow">
      <span>Round up per-person total</span>
      <div class="toggle" id="roundToggle" onclick="toggleRound()"><div class="dot"></div></div>
    </div>
  </div>

  <div class="hero">
    <div class="v" id="perPerson">$0.00</div>
    <div class="l">per person</div>
  </div>

  <div class="results">
    <div class="result"><div class="v" id="tipAmt">$0.00</div><div class="l">Tip</div></div>
    <div class="result"><div class="v" id="totalAmt">$0.00</div><div class="l">Total</div></div>
  </div>
</div>

<script>
const $=id=>document.getElementById(id);
let tipPct=20, people=4, roundUp=false;

function setTip(pct, fromCustom){
  tipPct=Math.max(0,pct);
  document.querySelectorAll('.chip').forEach(c=>c.classList.toggle('on',!fromCustom&&parseFloat(c.dataset.t)===tipPct));
  if(!fromCustom) $('customTip').value='';
  calc();
}
function stepPeople(d){
  people=Math.max(1,Math.min(50,people+d));
  $('people').textContent=people;
  calc();
}
function toggleRound(){
  roundUp=!roundUp;
  $('roundToggle').classList.toggle('on',roundUp);
  calc();
}
function money(n){return '$'+n.toFixed(2);}
function calc(){
  const bill=Math.max(0,parseFloat($('bill').value)||0);
  const tip=bill*(tipPct/100);
  const total=bill+tip;
  let per=total/people;
  if(roundUp) per=Math.ceil(per*100)/100;
  $('tipAmt').textContent=money(tip);
  $('totalAmt').textContent=money(roundUp?per*people:total);
  $('perPerson').textContent=money(per);
}
$('bill').addEventListener('input',calc);
calc();
</script>
</body>
</html>

Rebuild instructions

Create app.html as a single self-contained file: HTML + CSS + JavaScript, no external dependencies.
Style it with a deep teal gradient background and a glassmorphism card, matching a calm "money" feel rather than a form-heavy one.
Fields: a large dollar-amount input for the bill, four tip-percentage chips (10/15/20/25, one selected by default) plus a custom-percentage input that deselects the chips when used, and a +/− stepper for the number of people (clamped 1–50).
Add a toggle for "round up per-person total" that, when on, rounds each person's share up to the nearest cent and recomputes the displayed total as people × rounded share.
Compute tip = bill × pct/100, total = bill + tip, per-person = total / people (or the rounded variant), and recalculate live on every input change — no submit button.
Show the per-person amount as the large hero figure, with tip and total as two smaller result tiles below it.

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