#255B9E
Closest named color: Denim Blue (#3B5B92). oklch(47.1% 0.123 255.5), rgb(37, 91, 158).
Aa
White text reads best on this color (6.84:1).
About this color
#255B9E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.123 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.027 away. White text reads best on it, at 6.84:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.06:1 |
| White text | 6.84:1 |
Values
| HEX | #255B9E |
| RGB | rgb(37, 91, 158) |
| HSL | hsl(213, 62%, 38%) |
| OKLCH | oklch(47.1% 0.123 255.5) |
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 #255B9E | 6.84:1 | AA | Lc -88.3 | Fine for body text |
| Black text on #255B9E | 3.06:1 | AA large text | Lc 20.8 | Dividers and decoration only |
| #255B9E text on white | 6.84:1 | AA | Lc 83.3 | Fine for body text |
| #255B9E text on black | 3.06:1 | AA large text | Lc -18.7 | Dividers and decoration only |
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 700.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CBDBEF
oklch(88.6% 0.033 254)
-
Step 300
300
#A8C3E7
oklch(80.9% 0.059 255.7)
-
Step 400
400
#78A3DB
oklch(70.6% 0.095 255.3)
-
Step 500
500
#558BD1
oklch(63% 0.121 255.5)
-
Step 600
600
#3974BF
oklch(55.7% 0.132 255.6)
-
Step 700
700 (this color)
#255B9E
oklch(47.1% 0.123 255.5)
-
Step 800
800
#254F85
oklch(42.6% 0.102 255.8)
-
Step 900
900
#23426B
oklch(37.7% 0.08 256.1)
-
Step 950
950
#15273E
oklch(27% 0.049 255.2)
#255B9E 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) | #3A61A1 | 0.028 |
| Deuteranopia (no green cones) | #25559D | 0.017 |
| Tritanopia (no blue cones) | #006B75 | 0.094 |
| Achromatopsia (no color) | #5B5B5B | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255B9E
#255B9E
oklch(47.1% 0.123 255.5)
- #7B5200
#7B5200
oklch(47.2% 0.099 75.6)
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 #255B9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.027
- Dusk Blue #26538D ΔE 0.033
- Light Navy Blue #2E5A88 ΔE 0.036
- Dusky Blue #475F94 ΔE 0.041
- Peacock Blue #016795 ΔE 0.042
- Denim #3B638C ΔE 0.047
- Mid Blue #276AB3 ΔE 0.050
- Light Navy #155084 ΔE 0.053
Use #255B9E 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.