Pixel Density

{
  "asOf": "2026-10-11T14:32:44.713Z",
  "cssPixelPhysicalMm": 0.233487,
  "cssViewportHeight": 1440,
  "cssViewportWidth": 2560,
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "dotPitchMm": 0.23349,
  "dpr": 1,
  "heightInches": 13.2371,
  "heightMm": 336.221,
  "idealDprForReferencePixel": 1.1332,
  "imageWidthsForCssWidth": {
    "1.5x": 600,
    "1x": 400,
    "2x": 800,
    "3x": 1200,
    "atThisDpr": 400,
    "cssWidth": 400
  },
  "megapixels": 3.6864,
  "notChecked": [
    "the real device pixel ratio (browsers and OS scaling set it, not the panel)",
    "non-square pixels and pentile subpixel layouts",
    "…2 more"
  ],
  "ppi": 108.7855,
  "ppiClass": "STANDARD",
  "reasons": [
    "One CSS pixel spans 0.00919 in (0.2335 mm) on this screen at DPR 1; the CSS reference pixel is 1/96 in.",
    "Bands: under 120 PPI standard, 120 to 220 high, above 220 very high."
  ],
  "source": "PPI = sqrt(w^2 + h^2) / diagonal; CSS reference pixel = 1/96 in; computed locally",
  "summary": "2560 x 1440 on a 27 inch screen is 108.79 PPI (23.53 x 13.24 in); 2560 x 1440 CSS px at DPR 1.",
  "verdict": "STANDARD",
  "widthInches": 23.5325,
  "widthMm": 597.727
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://css-design-calc.x402tookit.com/pixel-density?cssWidth=400&diagonalIn=27&dpr=1&heightPx=1440&widthPx=2560'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://css-design-calc.x402tookit.com/pixel-density?cssWidth=400&diagonalIn=27&dpr=1&heightPx=1440&widthPx=2560' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fcss-design-calc.x402tookit.com%2Fpixel-density
const res = await pay("https://css-design-calc.x402tookit.com/pixel-density?cssWidth=400&diagonalIn=27&dpr=1&heightPx=1440&widthPx=2560");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://css-design-calc.x402tookit.com/pixel-density?cssWidth=400&diagonalIn=27&dpr=1&heightPx=1440&widthPx=2560")
    print(res.status_code, res.text)