#101F45
Closest named color: Oxford Blue (#1B263B). oklch(25.1% 0.074 265.2), rgb(16, 31, 69).
Aa
White text reads best on this color (16.10:1).
About this color
#101F45 is a dark, moderately saturated blue. In OKLCH its lightness is 25%, its chroma 0.074 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.037 away. White text reads best on it, at 16.10:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.30:1 |
| White text | 16.10:1 |
Values
| HEX | #101F45 |
| RGB | rgb(16, 31, 69) |
| HSL | hsl(223, 62%, 17%) |
| OKLCH | oklch(25.1% 0.074 265.2) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #101F45 | 16.10:1 | AAA | Lc -105.5 | Preferred for body text |
| Black text on #101F45 | 1.30:1 | Fails | Lc 0.0 | Not readable |
| #101F45 text on white | 16.10:1 | AAA | Lc 102.9 | Preferred for body text |
| #101F45 text on black | 1.30:1 | Fails | Lc 0.0 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 950.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FA
oklch(88.5% 0.048 266)
-
Step 300
300
#A5C0FA
oklch(80.9% 0.088 265.1)
-
Step 400
400
#769DF8
oklch(70.7% 0.141 265.4)
-
Step 500
500
#5381F5
oklch(63% 0.181 265.3)
-
Step 600
600
#3A68E4
oklch(55.7% 0.195 265.2)
-
Step 700
700
#2D55C6
oklch(49.1% 0.182 265.3)
-
Step 800
800
#2646A0
oklch(42.6% 0.151 265.5)
-
Step 900
900
#223C7F
oklch(37.6% 0.118 265.2)
-
Step 950
950 (this color)
#101F45
oklch(25.1% 0.074 265.2)
#101F45 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #0A2446 | 0.016 |
| Deuteranopia (no green cones) | #001F44 | 0.017 |
| Tritanopia (no blue cones) | #00282E | 0.061 |
| Achromatopsia (no color) | #212121 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101F45
#101F45
oklch(25.1% 0.074 265.2)
- #2D1F00
#2D1F00
oklch(25% 0.051 84.2)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #101F45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.037
- Dark #1B2431 ΔE 0.047
- Navy Blue #001146 ΔE 0.049
- Rich Black #0D1B2A ΔE 0.053
- Dark Indigo #1F0954 ΔE 0.060
- Marine #042E60 ΔE 0.063
- Jet #212529 ΔE 0.066
- Space Cadet #2B2D42 ΔE 0.067
Use #101F45 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.