Spending Alerts

Set a monthly budget and choose when to get an email: at half, most or all of the budget. Shows spend so far and a forecast.

Download the file Open full screen

One HTML file with the CSS and JavaScript inside. No library needed. MIT license.

Live preview

How to use it

Click Copy the code, or download the file.
Paste the CSS into your stylesheet, the HTML where you want the component, and the script before the closing body tag.
Change --accent at the top of the CSS to your brand color, then connect the events to your AI service.

What you get

Works in light and dark mode automatically
Keyboard friendly, with labels for screen readers
Fits phones, tablets and desktops
Respects the reduced motion setting
No framework, so it works with any stack

The code

<!DOCTYPE html>
<!--
  Spending Alerts: a free AI UI component
  From 100 Free AI UI Components by MM Rahman Bappi, MIT license
  https://mmrahmanbappi.github.io/100-free-ai-ui-components/

  How to use: copy the CSS, HTML and JavaScript below into your page.
  Colors are CSS variables at the top. Change --accent to match your brand.
  Light and dark themes follow the visitor's system setting, or set
  data-theme="dark" or data-theme="light" on the html element.
-->
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Spending Alerts | Free AI UI Component</title>
<meta name="description" content="Set a monthly budget and choose when to get an email: at half, most or all of the budget. Shows spend so far and a forecast.">
<meta name="robots" content="noindex, follow">
<style>
:root{
  --accent:#5b5bd6; --accent-ink:#fff; --accent-soft:#ececfc;
  --bg:#f7f7f8; --surface:#fff; --surface-2:#f1f1f4; --ink:#17171c; --text:#3a3a44; --muted:#6c6c78;
  --line:#e3e3e8; --good:#15803d; --warn:#b45309; --bad:#c62828;
  --radius:14px; --shadow:0 1px 2px rgba(20,20,30,.06),0 8px 24px -12px rgba(20,20,30,.18);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,Ubuntu,sans-serif; --mono:ui-monospace,"Cascadia Code",Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){
  --accent:#8b8bff; --accent-ink:#0f0f16; --accent-soft:#25254a;
  --bg:#0f0f13; --surface:#18181f; --surface-2:#212129; --ink:#f3f3f6; --text:#d4d4dc; --muted:#9a9aa8;
  --line:#2c2c36; --good:#4ade80; --warn:#fbbf24; --bad:#f87171; --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 30px -12px rgba(0,0,0,.6);
}}
:root[data-theme=dark]{
  --accent:#8b8bff; --accent-ink:#0f0f16; --accent-soft:#25254a;
  --bg:#0f0f13; --surface:#18181f; --surface-2:#212129; --ink:#f3f3f6; --text:#d4d4dc; --muted:#9a9aa8;
  --line:#2c2c36; --good:#4ade80; --warn:#fbbf24; --bad:#f87171; --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 30px -12px rgba(0,0,0,.6);
}
*{box-sizing:border-box}
html,body{margin:0}
body{min-height:100vh;display:grid;grid-template-columns:minmax(0,1fr);place-items:center;padding:24px;background:var(--bg);color:var(--text);font:15px/1.5 var(--font);-webkit-font-smoothing:antialiased}
button,input,textarea,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
[hidden]{display:none!important}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition:none!important}}
/* ---- component ---- */
.wrap{width:min(100%,560px);display:flex;flex-direction:column;gap:14px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 20px}
.card h2{font-size:15px;margin:0 0 4px;color:var(--ink)}
.muted{color:var(--muted);font-size:13px}
.num{font-variant-numeric:tabular-nums}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:10px;padding:8px 14px;font-size:14px;font-weight:600;cursor:pointer;text-decoration:none}
.btn:hover{border-color:var(--accent)}.btn.pri{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.bar{height:8px;border-radius:99px;background:var(--surface-2);overflow:hidden}
.bar i{display:block;height:100%;border-radius:99px;background:var(--accent);transition:width .3s,background .3s}
.ok{--lvl:var(--accent)}.warn{--lvl:var(--warn)}.full{--lvl:var(--bad)}
.tg{width:38px;height:22px;border-radius:99px;background:var(--line);position:relative;flex:none;border:0;cursor:pointer;padding:0}
.tg::after{content:"";position:absolute;top:3px;left:3px;width:16px;height:16px;border-radius:50%;background:#fff;transition:left .15s}
.tg[aria-checked=true]{background:var(--accent)}.tg[aria-checked=true]::after{left:19px}
.wrap{width:min(100%,560px)}
.budget{display:flex;align-items:center;gap:10px;margin:14px 0}
.budget label{font-weight:600;color:var(--ink);font-size:14px}
.money{display:flex;align-items:center;border:1px solid var(--line);border-radius:10px;padding:0 10px;background:var(--surface)}
.money span{color:var(--muted)}.money input{border:0;outline:0;background:none;width:90px;padding:8px 4px;color:var(--ink);font-variant-numeric:tabular-nums}
.money:focus-within{border-color:var(--accent)}
.track{position:relative;height:12px;border-radius:99px;background:var(--surface-2);margin:18px 0 6px}
.track .sp{position:absolute;left:0;top:0;bottom:0;border-radius:99px;background:var(--accent)}
.track .fc{position:absolute;left:0;top:0;bottom:0;border-radius:99px;background:repeating-linear-gradient(45deg,color-mix(in srgb,var(--accent) 35%,transparent) 0 6px,transparent 6px 12px)}
.track .mk{position:absolute;top:-4px;bottom:-4px;width:2px;background:var(--muted)}
.legend{display:flex;justify-content:space-between;font-size:12.5px;color:var(--muted);gap:10px;flex-wrap:wrap}
.alerts{list-style:none;margin:16px 0 0;padding:0}
.alerts li{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 0;border-top:1px solid var(--line);font-size:14px;color:var(--ink)}
.alerts small{display:block;color:var(--muted);font-size:12.5px}
.over{color:var(--bad);font-weight:600}
</style>
</head>
<body>
<div class="wrap"><div class="card">
  <h2>Monthly budget</h2><p class="muted" style="margin:0">Get an email before costs get out of hand.</p>
  <div class="budget"><label for="b">Budget</label><div class="money"><span>$</span><input id="b" type="number" min="1" value="500"></div></div>
  <div class="track" aria-hidden="true"><div class="fc" id="fc"></div><div class="sp" id="sp"></div><div class="mk" style="left:50%"></div><div class="mk" style="left:80%"></div></div>
  <div class="legend num" aria-live="polite"><span id="spent"></span><span id="fore"></span></div>
  <ul class="alerts" id="al"></ul>
</div></div>
<script>
// Demo helper: add ?theme=dark or ?theme=light to the address to preview a theme.
(function(){var t=new URLSearchParams(location.search).get('theme');if(t)document.documentElement.dataset.theme=t;})();
var SPENT=212,DAY=19,DAYS=30,b=document.getElementById('b'),sp=document.getElementById('sp'),fc=document.getElementById('fc'),al=document.getElementById('al');
var LEVELS=[[50,'At 50% of budget',true],[80,'At 80% of budget',true],[100,'When the budget is used up',true]];
function render(){var bud=Math.max(1,+b.value||1),fore=Math.round(SPENT/DAY*DAYS);
  sp.style.width=Math.min(100,SPENT/bud*100)+'%';fc.style.width=Math.min(100,fore/bud*100)+'%';
  document.getElementById('spent').textContent='Spent so far: $'+SPENT;var f=document.getElementById('fore');f.textContent='Forecast this month: $'+fore;f.className=fore>bud?'over':'';
  al.innerHTML='';LEVELS.forEach(function(l,i){var li=document.createElement('li');li.innerHTML='<span></span><button class="tg" type="button" role="switch"></button>';
    li.firstChild.innerHTML=l[1]+'<small>Email when spend reaches $'+Math.round(bud*l[0]/100)+'</small>';var t=li.querySelector('.tg');t.setAttribute('aria-checked',l[2]);t.setAttribute('aria-label',l[1]);
    t.onclick=function(){l[2]=!l[2];t.setAttribute('aria-checked',l[2]);};al.appendChild(li);});}
b.addEventListener('input',render);render();
</script>
</body>
</html>

More tokens and usage components

Token Ring Meter
A small ring that fills as a chat uses up its token budget. It turns orange near the limit and red when full, with an exact count on hover.
Context Window Bar
A bar that shows what fills the AI's memory for this chat: instructions, files, chat history and room left for the reply.
Credits Remaining Card
Shows how many credits are left this month, when they reset, and a button to buy more. The bar changes color as credits run low.
Rate Limit Banner
A clear banner when someone hits their message limit, with a live countdown to when they can send again and the prompt box turned off.
Cost per Message
A small line under each answer showing tokens in and out and what the message cost. Click it to see the full breakdown.
Daily Usage Chart
A small bar chart of tokens used each day for two weeks. Hover or use the Tab key to read each day's exact number.

Spending Alerts

How to use it

What you get

The code

More tokens and usage components

Token Ring Meter

Context Window Bar

Credits Remaining Card

Rate Limit Banner

Cost per Message

Daily Usage Chart