#101F40
Closest named color: Oxford Blue (#1B263B). oklch(24.7% 0.066 263.8), rgb(16, 31, 64).
Aa
White text reads best on this color (16.25:1).
About this color
#101F40 is a very dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.066 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.033 away. White text reads best on it, at 16.25:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.29:1 |
| White text | 16.25:1 |
Values
| HEX | #101F40 |
| RGB | rgb(16, 31, 64) |
| HSL | hsl(221, 60%, 16%) |
| OKLCH | oklch(24.7% 0.066 263.8) |
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 #101F40 | 16.25:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #101F40 | 1.29:1 | Fails | Lc 0.0 | Not readable |
| #101F40 text on white | 16.25:1 | AAA | Lc 103.1 | Preferred for body text |
| #101F40 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CBDAF7
oklch(88.6% 0.043 263.7)
-
Step 300
300
#A7C1F4
oklch(80.9% 0.078 263.6)
-
Step 400
400
#789FEF
oklch(70.8% 0.125 263.7)
-
Step 500
500
#5684E9
oklch(63% 0.16 264)
-
Step 600
600
#3C6CD7
oklch(55.6% 0.173 263.6)
-
Step 700
700
#2F59BB
oklch(49.1% 0.162 263.9)
-
Step 800
800
#274997
oklch(42.6% 0.134 263.9)
-
Step 900
900
#243E78
oklch(37.6% 0.104 263.9)
-
Step 950
950 (this color)
#101F40
oklch(24.7% 0.066 263.8)
#101F40 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) | #0F2341 | 0.013 |
| Deuteranopia (no green cones) | #071E3F | 0.011 |
| Tritanopia (no blue cones) | #00272C | 0.055 |
| Achromatopsia (no color) | #202020 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101F40
#101F40
oklch(24.7% 0.066 263.8)
- #2C1E00
#2C1E00
oklch(24.6% 0.05 83.6)
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 #101F40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.033
- Dark #1B2431 ΔE 0.040
- Rich Black #0D1B2A ΔE 0.043
- Navy Blue #001146 ΔE 0.051
- Jet #212529 ΔE 0.059
- Dark Indigo #1F0954 ΔE 0.066
- Space Cadet #2B2D42 ΔE 0.066
- Marine #042E60 ΔE 0.070
Use #101F40 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.