#010FCCTrue Blue (#010FCC) is a dark, vivid blue with an OKLCH hue of 264°, lightness 0.39 and chroma 0.26. It sits on the cool side of the color wheel. In practice it behaves as an accent color: strong in focal moments, dominant over large fields.
| HEX | #010FCC |
|---|---|
| RGB | rgb(1, 15, 204) |
| HSL | hsl(236, 99%, 40%) |
| HSV | hsv(236, 100%, 80%) |
| CMYK | cmyk(100%, 93%, 0%, 20%) |
| CIE Lab | lab(25.9 63.7 -89.4) |
| OKLCH | oklch(0.389 0.260 264) |
Under warm 2700K interior light True Blue shifts subtly: leans toward purple, loses intensity; in north-facing or shaded light it is virtually unchanged. Overall drift across common illuminants is small (max ΔE ≈ 2.3), so it is a lighting-stable choice.
#1517c0 — ΔE 2.3, shifts subtly: leans toward purple, loses intensity#0d15c9 — ΔE 1.0, is virtually unchanged#010fcc — ΔE 0.0, is virtually unchanged#000ccf — ΔE 0.5, is virtually unchangedTest True Blue in the color lighting simulator — sweep it through daylight, warm 2700K light, 4000K LED, and shade alongside the rest of your palette.
Against white it measures 10.82:1 and against black 1.94:1, so white text is the stronger pairing. That pairing passes WCAG AA for body text. Avoid black text on this color entirely.
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.
#6595ff · #2f66f3 · #010fcc · #01009c · #00004e · #000012
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.
#006f97 · #005895 · #010fcc · #2f0096 · #310064 · #28003b
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.
#de9cf8 · #6796ff · #b62be1 · #7c4591 · #010fcc · #01008d
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.
#f7b900 · #5b80d1 · #4c6290 · #010fcc · #031b6d · #000736
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#fdf0d7 · #94a5c6 · #655c4b · #010fcc · #1e2c4d · #0e0600
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.
#f7f1e6 · #d1cbbe · #a8a193 · #372e1c · #150c00 · #010fcc
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#c8e0c1 · #d2c237 · #9d76b0 · #485f45 · #010fcc · #030f16
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#bfdabc · #b5af6c · #b67653 · #4d5f4b · #010fcc · #041119
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#ffedeb · #ff716c · #007215 · #010fcc · #003905 · #080000
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#ffecf3 · #ff64ac · #775800 · #010fcc · #00372b · #0e0600
#184BDD · #3D71EE · #6393FE · #92B5FF · #C1D6FF
#0200B3 · #010096 · #010079 · #01005E · #000045
#072FAF · #1A3C93 · #2B4277
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.