#255BA5
Closest named color: Denim Blue (#3B5B92). oklch(47.6% 0.132 257.3), rgb(37, 91, 165).
Aa
White text reads best on this color (6.73:1).
About this color
#255BA5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.132 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.036 away. White text reads best on it, at 6.73:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.11:1 |
| White text | 6.73:1 |
Values
| HEX | #255BA5 |
| RGB | rgb(37, 91, 165) |
| HSL | hsl(215, 63%, 40%) |
| OKLCH | oklch(47.6% 0.132 257.3) |
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 #255BA5 | 6.73:1 | AA | Lc -87.9 | Fine for body text |
| Black text on #255BA5 | 3.11:1 | AA large text | Lc 21.2 | Dividers and decoration only |
| #255BA5 text on white | 6.73:1 | AA | Lc 82.8 | Fine for body text |
| #255BA5 text on black | 3.11:1 | AA large text | Lc -19.1 | 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
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CBDAF1
oklch(88.4% 0.036 258.9)
-
Step 300
300
#A7C3EA
oklch(81% 0.063 256.7)
-
Step 400
400
#77A2E0
oklch(70.6% 0.103 257.5)
-
Step 500
500
#538AD7
oklch(63.1% 0.131 257.1)
-
Step 600
600
#3772C5
oklch(55.5% 0.143 257.4)
-
Step 700
700 (this color)
#255BA5
oklch(47.6% 0.132 257.3)
-
Step 800
800
#244E8A
oklch(42.7% 0.11 257.7)
-
Step 900
900
#22426E
oklch(37.8% 0.085 256.8)
-
Step 950
950
#142740
oklch(27% 0.053 255.8)
#255BA5 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) | #3562A8 | 0.026 |
| Deuteranopia (no green cones) | #1B56A4 | 0.017 |
| Tritanopia (no blue cones) | #006D78 | 0.102 |
| Achromatopsia (no color) | #5C5C5C | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255BA5
#255BA5
oklch(47.6% 0.132 257.3)
- #7B5400
#7B5400
oklch(47.6% 0.099 77.7)
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 #255BA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.036
- Dusk Blue #26538D ΔE 0.042
- Mid Blue #276AB3 ΔE 0.045
- Dusky Blue #475F94 ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.047
- Peacock Blue #016795 ΔE 0.049
- Denim #3B638C ΔE 0.055
- French Blue #436BAD ΔE 0.058
Use #255BA5 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.