#153B75
Closest named color: Twilight Blue (#0A437A). oklch(36.1% 0.109 258.9), rgb(21, 59, 117).
Aa
White text reads best on this color (10.96:1).
About this color
#153B75 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.109 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.024 away. White text reads best on it, at 10.96:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.91:1 |
| White text | 10.96:1 |
Values
| HEX | #153B75 |
| RGB | rgb(21, 59, 117) |
| HSL | hsl(216, 70%, 27%) |
| OKLCH | oklch(36.1% 0.109 258.9) |
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 #153B75 | 10.96:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #153B75 | 1.91:1 | Fails | Lc 8.9 | Not readable |
| #153B75 text on white | 10.96:1 | AAA | Lc 95.0 | Preferred for body text |
| #153B75 text on black | 1.91:1 | Fails | Lc -7.6 | 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 900.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DBF8
oklch(88.6% 0.045 258.8)
-
Step 300
300
#A1C2F6
oklch(80.8% 0.082 259.4)
-
Step 400
400
#6DA1F1
oklch(70.7% 0.13 258.7)
-
Step 500
500
#4687EC
oklch(63.1% 0.166 259)
-
Step 600
600
#266EDB
oklch(55.6% 0.182 259.1)
-
Step 700
700
#185BBE
oklch(49.1% 0.169 259.1)
-
Step 800
800
#174B99
oklch(42.6% 0.139 259)
-
Step 900
900 (this color)
#153B75
oklch(36.1% 0.109 258.9)
-
Step 950
950
#102647
oklch(27% 0.068 258.4)
#153B75 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) | #1B4177 | 0.019 |
| Deuteranopia (no green cones) | #003874 | 0.017 |
| Tritanopia (no blue cones) | #004952 | 0.084 |
| Achromatopsia (no color) | #3C3C3C | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #153B75
#153B75
oklch(36.1% 0.109 258.9)
- #523800
#523800
oklch(36.1% 0.075 79.6)
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 #153B75, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.024
- Marine Blue #01386A ΔE 0.025
- Prussian Blue #1D3557 ΔE 0.052
- Marine #042E60 ΔE 0.055
- Cobalt #1E488F ΔE 0.057
- Light Navy #155084 ΔE 0.064
- Dark Grey Blue #29465B ΔE 0.066
- Dark Blue Grey #1F3B4D ΔE 0.071
Use #153B75 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.