One address, checked by a person: hello@nxtolerance.com.

A number looks wrong?

That’s the report we prioritize. If a result disagrees with your device or your math, the most useful message contains four things:

1. which mode (PPI, megapixels, print size, aspect ratio, CSS pixels),
2. what you entered — or which preset,
3. what the calculator showed,
4. what you expected instead (the spec sheet value, your own calculation, or the panel’s EDID).

Keep in mind the page computes exact values: an iPhone advertised at “460 ppi” will show ≈461 because 1179×2556 on 6.1″ is 461.4. Disagreements with marketing numbers are often the tool being literal — but disagreements with measured ones are bugs we want to see.

Wrong or stale information in a guide?

Each article — PPI vs DPI, print resolution, 4K pixels, CSS pixels — was written against the underlying standards, and standards do get misread. Quote the sentence, give the correction, and point at a source (spec, manufacturer datasheet, measured values). Include the page URL.

Suggesting a feature or preset?

Describe the task you were doing, not just the label — “I needed required-px for a canvas wrap with 1.5″ bleed” explains more than “add bleed”. Preset requests are welcome when the panel’s specs are published and verifiable.

Other mail

Display problems, accessibility barriers, business or press inquiries — same inbox. If it concerns a specific page, the URL helps more than a screenshot.

What to expect back

No ticket system, no autoresponder pretending to be one. A crisp reproduction (“3440×1440 claims 21:9 but shows 43:18 — is that right?”) typically gets an answer within days; open-ended feedback is read even when it isn’t replied to quickly.