Red `#FF0000`

Red (#FF0000) is a mid-tone, vivid red with an OKLCH hue of 29°, lightness 0.63 and chroma 0.258. It sits on the warm side of the color wheel. In practice it behaves as an accent color: strong in focal moments, dominant over large fields.

Color values

HEX	`#FF0000`
RGB	`rgb(255, 0, 0)`
HSL	`hsl(0, 100%, 50%)`
HSV	`hsv(0, 100%, 100%)`
CMYK	`cmyk(0%, 100%, 100%, 0%)`
CIE Lab	`lab(53.2 80.1 67.2)`
OKLCH	`oklch(0.628 0.258 29)`

How Red behaves under real light

Under warm 2700K interior light Red is virtually unchanged; in north-facing or shaded light it is virtually unchanged. Overall drift across common illuminants is small (max ΔE ≈ 0.1), so it is a lighting-stable choice.

Warm interior (2700K incandescent / warm LED): → #ff0000 — ΔE 0.0, is virtually unchanged
Neutral LED (4000K task and retail lighting): → #ff0000 — ΔE 0.0, is virtually unchanged
Daylight (6500K standard daylight (reference)): → #ff0000 — ΔE 0.0, is virtually unchanged
North light / shade (~7500K diffuse blue-sky light): → #ff0202 — ΔE 0.1, is virtually unchanged

Contrast & accessibility

Against white it measures 4:1 and against black 5.25:1, so black text is the stronger pairing. That pairing passes WCAG AA for body text.

Palettes built from Red

Tonal

One color explored: close hues with real lightness and chroma structure, so the palette is the anchor through value rather than a set of colors.

#ffd6cf · #ff9889 · #ff0000 · #cf0000 · #910000 · #580000

Analogous

The anchor's neighbours on the wheel — everything shares an undertone, so the chord carries color without anything having to be muted to get along.

#fa8f00 · #f86800 · #ff0000 · #db004e · #b80067 · #940073

Shifted

The mid-gap pairing — sage and mustard, terracotta and olive. A foil rotated 40–65° toward warm or cool: too far to be kin, too near to argue, carried by temperature and a deliberate value offset.

#d09e39 · #ff0000 · #cb0000 · #684900 · #6a0000 · #281900

Contrast

One deliberately opposed voice — a single restrained counterpoint across the wheel, or temperature against temperature where the anchor is too muted to carry a loud opposite.

#ffece9 · #00dcf5 · #ff0000 · #90574e · #861d15 · #511610

Quiet Support

The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.

#d7f9ff · #c29891 · #ff0000 · #5b7377 · #48201b · #000304

Bright Accent

This color as a ground rather than a subject — its own restraint held across a narrow value band, carrying one saturated voice from the opposite temperature.

#e6f5f7 · #bccdd0 · #8ea1a5 · #0f2a2e · #00070a · #ff0000

Complementary

The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.

#cadebc · #3bccd6 · #ff0000 · #995e82 · #324251 · #1e0511

Split-complementary

The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.

#d7f9ff · #00bea6 · #ff0000 · #0076ad · #00362e · #000611

Triadic

Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.

#d4ffda · #00c557 · #ff0000 · #3a50ff · #14008e · #000200

Tetradic

Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.

#ebfabf · #99b200 · #ff0000 · #007c8b · #3c0071 · #000304

Tints, shades & muted variants

Tints

#FF5948 · #FF806F · #FFA092 · #FFBDB2 · #FFD8D1

Shades

#D40000 · #AA0000 · #810000 · #5C0000 · #390000

Muted

#EA4637 · #D36052 · #BA7267

Using Red

Its chroma is high enough to carry accents, calls to action, and focal moments; large fields of it will dominate a composition. In palettes it pairs most predictably with its tonal ramp and analogous neighbors; reserve the complementary hue for small, deliberate contrast.