What will a CDN cost at your GB-per-month bandwidth, and who is cheapest?

Enter your GB delivered per month and growth rate. Get Amazon CloudFront, Google Cloud CDN, Fastly, Bunny CDN and KeyCDN priced side by side, the 12-month spend, and the bandwidth volumes (GB per month) where the cheapest provider changes — before you build on one and find out when the invoice arrives.

Nothing is uploaded. Calculated in this browser from numbers you enter and approximate list prices you can edit. It cannot see your plan or your invoice.

1. Your bandwidth

GB delivered per month today

Growth in volume per month (%)

Monthly budget in USD (optional)

Budget applies to

2. Comparison

Provider	Per month	Per year	12-month spend with growth

Where the cheapest provider changes

GB delivered per month	Cheapest

Several providers are $0 at small sizes, so the first rows are ties. Cloudflare is not listed because its plans are flat-fee and fair-use or negotiated enterprise contracts rather than a per-GB rate, so it cannot be priced honestly here: compare its plan against the per-GB totals yourself. CloudFront's first 1 TB a month is free. Bunny and KeyCDN carry small monthly minimums.

Rate cards (editable)

Provider	Free up to (GB/mo)	First paid plan (USD/mo)	GB in first plan	Overage per GB

Plans beyond the first stay at the defaults here; use the CLI --prices file to edit every plan. Press Compare after changing a value.

Prefer a CLI, or want a budget gate in CI?

node cli.mjs compare --gb 3000 --growth 6
node cli.mjs compare --gb 8000 --provider cloudfront --budget 300   # exit 1 over budget
node cli.mjs crossover
node cli.mjs compare --gb 3000 --prices prices.json --json

Get cli.mjs and engine.mjs — Node 18+, nothing to install, no network call. More: how to choose a CDN by GB delivered.

Common questions

Does this read my CDN account?

No. It uses only the monthly delivered volume (GB) you type and rate cards you can edit. It cannot see your plan, regional mix, contract or invoice. Treat every figure as a way to compare options, never as what you will be charged.

Where do the prices come from?

They are approximate public list prices as best known in 2025, shown with an as-of line, and every number is editable. CDNs price by region and committed volume and change packaging often, so check each vendor's pricing page before deciding.

What is not included?

Regional price tiers (Asia, South America and Australia cost several times more), request fees, TLS and custom-domain fees, image optimisation, WAF, log delivery, support plans, commit discounts and fair-use limits. These are often the real bill, so use this to compare the per-GB line, not to forecast the whole invoice. Cache hit rate, edge coverage in your visitors' regions and performance are not priced here and often matter more than a few dollars.

Is my data uploaded anywhere?

No. The page calculates in your browser and sends nothing. The CLI reads local files and makes no network call.