#101B51
Closest named color: Dark Indigo (#1F0954). oklch(25.3% 0.099 269.1), rgb(16, 27, 81).
Aa
White text reads best on this color (16.18:1).
About this color
#101B51 is a dark, moderately saturated blue. In OKLCH its lightness is 25%, its chroma 0.099 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.042 away. White text reads best on it, at 16.18:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.29:1 |
| White text | 16.18:1 |
Values
| HEX | #101B51 |
| RGB | rgb(16, 27, 81) |
| HSL | hsl(230, 67%, 19%) |
| OKLCH | oklch(25.3% 0.099 269.1) |
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 #101B51 | 16.18:1 | AAA | Lc -105.4 | Preferred for body text |
| Black text on #101B51 | 1.29:1 | Fails | Lc 0.0 | Not readable |
| #101B51 text on white | 16.18:1 | AAA | Lc 102.8 | Preferred for body text |
| #101B51 text on black | 1.29:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A7BEFF
oklch(80.8% 0.096 269.2)
-
Step 400
400
#7A9AFF
oklch(70.7% 0.152 269)
-
Step 500
500
#5A7CFF
oklch(63% 0.198 269.1)
-
Step 600
600
#3F5AFF
oklch(55.6% 0.244 269.2)
-
Step 700
700
#3043E7
oklch(49.1% 0.243 269)
-
Step 800
800
#2739BB
oklch(42.7% 0.202 269)
-
Step 900
900
#223493
oklch(37.7% 0.157 269)
-
Step 950
950 (this color)
#101B51
oklch(25.3% 0.099 269.1)
#101B51 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) | #002453 | 0.027 |
| Deuteranopia (no green cones) | #001E50 | 0.017 |
| Tritanopia (no blue cones) | #002933 | 0.079 |
| Achromatopsia (no color) | #212121 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101B51
#101B51
oklch(25.3% 0.099 269.1)
- #2C2100
#2C2100
oklch(25.4% 0.052 90.4)
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 #101B51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.042
- Navy Blue #001146 ΔE 0.044
- Darkblue #030764 ΔE 0.054
- Midnight Blue #191970 ΔE 0.057
- Marine #042E60 ΔE 0.059
- Oxford Blue #1B263B ΔE 0.060
- Night Blue #040348 ΔE 0.065
- Dark Royal Blue #02066F ΔE 0.066
Use #101B51 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.