#153F8B
Closest named color: Cobalt (#1E488F). oklch(38.8% 0.135 261.1), rgb(21, 63, 139).
Aa
White text reads best on this color (9.92:1).
About this color
#153F8B is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.135 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.028 away. White text reads best on it, at 9.92:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.11:1 |
| White text | 9.92:1 |
Values
| HEX | #153F8B |
| RGB | rgb(21, 63, 139) |
| HSL | hsl(219, 74%, 31%) |
| OKLCH | oklch(38.8% 0.135 261.1) |
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 #153F8B | 9.92:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #153F8B | 2.11:1 | Fails | Lc 11.4 | Not readable |
| #153F8B text on white | 9.92:1 | AAA | Lc 92.5 | Preferred for body text |
| #153F8B text on black | 2.11:1 | Fails | Lc -9.9 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEBFE
oklch(93.7% 0.029 259.6)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9EC1FF
oklch(80.8% 0.096 261.6)
-
Step 400
400
#689FFF
oklch(70.7% 0.153 260.8)
-
Step 500
500
#3E82FF
oklch(63% 0.199 261.3)
-
Step 600
600
#1466F4
oklch(55.6% 0.226 261.2)
-
Step 700
700
#0553D4
oklch(49% 0.21 261.2)
-
Step 800
800
#0A45AC
oklch(42.7% 0.175 261.2)
-
Step 900
900 (this color)
#153F8B
oklch(38.8% 0.135 261.1)
-
Step 950
950
#0C244F
oklch(27% 0.085 261)
#153F8B 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) | #02488E | 0.025 |
| Deuteranopia (no green cones) | #003E8A | 0.012 |
| Tritanopia (no blue cones) | #00525E | 0.105 |
| Achromatopsia (no color) | #434343 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #153F8B
#153F8B
oklch(38.8% 0.135 261.1)
- #5A3F00
#5A3F00
oklch(38.8% 0.08 81.1)
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 #153F8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.028
- Twilight Blue #0A437A ΔE 0.033
- Light Navy #155084 ΔE 0.052
- Sapphire #2138AB ΔE 0.056
- Marine Blue #01386A ΔE 0.061
- Dusk Blue #26538D ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.063
- Blueberry #464196 ΔE 0.063
Use #153F8B 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.