#101F3B
Closest named color: Oxford Blue (#1B263B). oklch(24.3% 0.058 261.8), rgb(16, 31, 59).
Aa
White text reads best on this color (16.39:1).
About this color
#101F3B is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.058 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.030 away. White text reads best on it, at 16.39:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.28:1 |
| White text | 16.39:1 |
Values
| HEX | #101F3B |
| RGB | rgb(16, 31, 59) |
| HSL | hsl(219, 57%, 15%) |
| OKLCH | oklch(24.3% 0.058 261.8) |
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 #101F3B | 16.39:1 | AAA | Lc -105.7 | Preferred for body text |
| Black text on #101F3B | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #101F3B text on white | 16.39:1 | AAA | Lc 103.2 | Preferred for body text |
| #101F3B text on black | 1.28:1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#A9C1ED
oklch(80.8% 0.068 262.5)
-
Step 400
400
#7BA0E5
oklch(70.6% 0.11 262.3)
-
Step 500
500
#5987DD
oklch(63% 0.14 261.9)
-
Step 600
600
#3F6FCB
oklch(55.6% 0.152 262)
-
Step 700
700
#315DAF
oklch(49.2% 0.14 261.5)
-
Step 800
800
#294C8E
oklch(42.7% 0.117 261.7)
-
Step 900
900
#254071
oklch(37.7% 0.09 261.4)
-
Step 950
950 (this color)
#101F3B
oklch(24.3% 0.058 261.8)
#101F3B 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) | #12223C | 0.011 |
| Deuteranopia (no green cones) | #0C1E3A | 0.007 |
| Tritanopia (no blue cones) | #00252A | 0.047 |
| Achromatopsia (no color) | #1F1F1F | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101F3B
#101F3B
oklch(24.3% 0.058 261.8)
- #2C1D00
#2C1D00
oklch(24.3% 0.05 81.3)
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 #101F3B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.030
- Dark #1B2431 ΔE 0.033
- Rich Black #0D1B2A ΔE 0.034
- Jet #212529 ΔE 0.052
- Navy Blue #001146 ΔE 0.055
- Space Cadet #2B2D42 ΔE 0.067
- Dark Indigo #1F0954 ΔE 0.073
- Marine #042E60 ΔE 0.077
Use #101F3B 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.