#101F49
Closest named color: Oxford Blue (#1B263B). oklch(25.4% 0.081 266), rgb(16, 31, 73).
Aa
White text reads best on this color (15.97:1).
About this color
#101F49 is a dark, moderately saturated blue. In OKLCH its lightness is 25%, its chroma 0.081 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.041 away. White text reads best on it, at 15.97:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.31:1 |
| White text | 15.97:1 |
Values
| HEX | #101F49 |
| RGB | rgb(16, 31, 73) |
| HSL | hsl(224, 64%, 17%) |
| OKLCH | oklch(25.4% 0.081 266) |
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 #101F49 | 15.97:1 | AAA | Lc -105.3 | Preferred for body text |
| Black text on #101F49 | 1.31:1 | Fails | Lc 0.0 | Not readable |
| #101F49 text on white | 15.97:1 | AAA | Lc 102.7 | Preferred for body text |
| #101F49 text on black | 1.31:1 | 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
#F1F5FE
oklch(97% 0.013 266.7)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C9D9FD
oklch(88.5% 0.053 266.4)
-
Step 300
300
#A4C0FF
oklch(81% 0.095 265.8)
-
Step 400
400
#749CFF
oklch(70.8% 0.152 266)
-
Step 500
500
#517FFE
oklch(63.1% 0.196 266)
-
Step 600
600
#3864EE
oklch(55.7% 0.213 266)
-
Step 700
700
#2B52CF
oklch(49.2% 0.198 265.9)
-
Step 800
800
#2444A7
oklch(42.7% 0.164 265.9)
-
Step 900
900
#213B84
oklch(37.8% 0.127 265.8)
-
Step 950
950 (this color)
#101F49
oklch(25.4% 0.081 266)
#101F49 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) | #05244A | 0.017 |
| Deuteranopia (no green cones) | #001F48 | 0.017 |
| Tritanopia (no blue cones) | #002930 | 0.066 |
| Achromatopsia (no color) | #222222 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101F49
#101F49
oklch(25.4% 0.081 266)
- #2E2000
#2E2000
oklch(25.4% 0.052 84.7)
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 #101F49, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.041
- Navy Blue #001146 ΔE 0.049
- Dark #1B2431 ΔE 0.054
- Dark Indigo #1F0954 ΔE 0.056
- Marine #042E60 ΔE 0.058
- Rich Black #0D1B2A ΔE 0.060
- Space Cadet #2B2D42 ΔE 0.068
- Darkblue #030764 ΔE 0.072
Use #101F49 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.