#101F3A
Closest named color: Oxford Blue (#1B263B). oklch(24.2% 0.056 261.3), rgb(16, 31, 58).
Aa
White text reads best on this color (16.41:1).
About this color
#101F3A is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.056 and its hue 261°. 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 16.41:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.27:1 |
| White text | 16.41:1 |
Values
| HEX | #101F3A |
| RGB | rgb(16, 31, 58) |
| HSL | hsl(219, 57%, 15%) |
| OKLCH | oklch(24.2% 0.056 261.3) |
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 #101F3A | 16.41:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #101F3A | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #101F3A text on white | 16.41:1 | AAA | Lc 103.3 | Preferred for body text |
| #101F3A text on black | 1.27:1 | 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
#CCDAF2
oklch(88.5% 0.036 261.3)
-
Step 300
300
#A9C2EC
oklch(81% 0.066 260.7)
-
Step 400
400
#7BA1E3
oklch(70.8% 0.106 261.1)
-
Step 500
500
#5A88DB
oklch(63.2% 0.135 261.4)
-
Step 600
600
#3F70C8
oklch(55.6% 0.147 261.1)
-
Step 700
700
#315DAD
oklch(49% 0.137 261.2)
-
Step 800
800
#2A4C8C
oklch(42.6% 0.113 261.8)
-
Step 900
900
#264070
oklch(37.7% 0.089 261.6)
-
Step 950
950 (this color)
#101F3A
oklch(24.2% 0.056 261.3)
#101F3A 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) | #13213B | 0.008 |
| Deuteranopia (no green cones) | #0D1E39 | 0.006 |
| Tritanopia (no blue cones) | #002529 | 0.047 |
| Achromatopsia (no color) | #1F1F1F | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101F3A
#101F3A
oklch(24.2% 0.056 261.3)
- #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 #101F3A, 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 0.032
- Rich Black #0D1B2A ΔE 0.033
- Jet #212529 ΔE 0.051
- Navy Blue #001146 ΔE 0.056
- Space Cadet #2B2D42 ΔE 0.067
- Dark Indigo #1F0954 ΔE 0.075
- Gunmetal #293241 ΔE 0.078
Use #101F3A 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.