Auth0

Identity platform; B2C Free covers up to 25,000 monthly active users.

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html
<div class="usage" data-motif="key"><div class="head"><b>AUTH0 · MAU</b><span id="amount">0</span></div><div class="art"><i></i><i></i><i></i><i></i><i></i><i></i><i></i><i></i></div><div class="rail"><span id="fill"></span></div><div class="readout"><span id="volume">0</span><strong id="cost">$0</strong></div><input id="usage-slider" type="range" min="0" max="50000" step="1" value="0" aria-label="Monthly usage"><small>Free ≤25k · higher MAU tier: unpublished</small></div>
css
.usage{width:min(94vw,760px);height:min(88vh,325px);padding:clamp(8px,2.2vmin,17px);border:1px solid var(--line);border-radius:14px;background:var(--surface);display:flex;flex-direction:column;gap:clamp(4px,1.4vmin,9px);font:600 clamp(12px,2.5vmin,17px)/1.2 var(--font-sans,system-ui);overflow:hidden}.head,.readout{display:flex;align-items:center;justify-content:space-between;gap:8px}.head b{font-size:1.1em;color:var(--accent)}.head span{font-family:ui-monospace,monospace;color:var(--muted)}.art{flex:1;min-height:35px;display:flex;align-items:center;justify-content:center;gap:clamp(3px,1.2vmin,10px);padding:3px 7px}.art i{display:block;flex:1;max-width:52px;height:35%;border:2px solid var(--line);background:var(--bg);transition:background .3s,height .3s,transform .3s}.art i.on{background:var(--accent);border-color:var(--accent)}.rail{height:7px;border-radius:7px;background:var(--line);overflow:hidden}.rail span{display:block;height:100%;width:0;background:var(--accent-2);transition:width .35s}.readout strong{font:800 clamp(15px,4.5vmin,27px)/1 ui-monospace,monospace;color:var(--accent-2)}.readout strong.unknown{font-size:clamp(11px,2.6vmin,16px)}.usage input{width:100%;height:18px;accent-color:var(--accent)}.usage small{color:var(--muted);font-size:clamp(10px,2.2vmin,13px);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}[data-motif=people] .art i{flex:none;width:clamp(15px,5vmin,36px);height:clamp(15px,5vmin,36px);border-radius:50%;box-shadow:0 9px 0 -4px var(--line)}[data-motif=key] .art i{height:55%;border-radius:40% 40% 4px 4px;transform:rotate(-12deg)}[data-motif=mail] .art i{height:48%;border-radius:3px;clip-path:polygon(0 0,100% 0,100% 85%,50% 52%,0 85%)}[data-motif=route] .art i{height:14%;border-radius:20px;transform:translateY(calc((var(--n,0) - 3) * 5px))}[data-motif=route] .art i:nth-child(2n){--n:7}[data-motif=errors] .art i{height:var(--h,45%);border-radius:2px 2px 0 0}[data-motif=errors] .art i:nth-child(3n){--h:85%}[data-motif=events] .art i{height:var(--h,65%);border-radius:30px}[data-motif=events] .art i:nth-child(2n){--h:28%}[data-motif=search] .art{flex-direction:column;align-items:stretch;gap:3px}[data-motif=search] .art i{height:6px;max-width:none;width:var(--w,88%);border:0;border-radius:10px}[data-motif=search] .art i:nth-child(3n){--w:58%}[data-motif=tiles] .art{display:grid;grid-template-columns:repeat(4,min(9vw,42px));grid-template-rows:repeat(2,1fr);justify-content:center}[data-motif=tiles] .art i{width:100%;height:100%;border-radius:4px}
js
const slider=document.getElementById('usage-slider'),amount=document.getElementById('amount'),volume=document.getElementById('volume'),costEl=document.getElementById('cost'),fill=document.getElementById('fill'),shapes=[...document.querySelectorAll('.art i')];const steps=[0,10000,25000,30000,50000],cap=50000,free=25000,unit="MAU/mo";let index=0,timer;function draw(n){const cost=(n<=25000?0:null);slider.value=String(n);amount.textContent=n.toLocaleString()+' '+unit;volume.textContent=n<=free?Math.round(n/free*100)+'% of free tier':'+'+(n-free).toLocaleString()+' over free';costEl.textContent=cost===null?"price unpublished":'$'+cost.toLocaleString('en-US',{maximumFractionDigits:2});costEl.classList.toggle('unknown',cost===null);fill.style.width=Math.min(100,n/free*100)+'%';fill.style.background=n>free?'var(--accent-3)':'var(--accent-2)';shapes.forEach((shape,i)=>shape.classList.toggle('on',i<Math.max(0,Math.ceil(n/cap*shapes.length))))}draw(steps[0]);timer=setInterval(()=>{index=(index+1)%steps.length;draw(steps[index])},1100);slider.addEventListener('input',()=>{clearInterval(timer);draw(Number(slider.value))})

Auth0 offers sign-in, identity connections, organizations, and authorization features. Consider it when identity and B2B requirements are complex.

As of 2026-10, B2C Free is $0/month through 25,000 MAU. The official B2C monthly selector shows Essentials at $35/month and Professional at $240/month when 500 MAU is selected. A paid tier price beyond 25,000 MAU and a per-MAU overage rate could not be verified.

The displayed $35 is not a valid base charge to add after the 25,000-MAU free tier. B2B, SSO, and organization features vary by plan; check the chosen usage tier and contract for an actual quote.

When to use

Consider it for complex organizations, connections, or authorization. Normalize user definitions and features before comparing with Clerk.

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