#255AA9
Closest named color: Denim Blue (#3B5B92). oklch(47.6% 0.139 258.6), rgb(37, 90, 169).
Aa
White text reads best on this color (6.74:1).
About this color
#255AA9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.139 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.042 away. White text reads best on it, at 6.74:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.11:1 |
| White text | 6.74:1 |
Values
| HEX | #255AA9 |
| RGB | rgb(37, 90, 169) |
| HSL | hsl(216, 64%, 40%) |
| OKLCH | oklch(47.6% 0.139 258.6) |
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 #255AA9 | 6.74:1 | AA | Lc -87.9 | Fine for body text |
| Black text on #255AA9 | 3.11:1 | AA large text | Lc 21.2 | Dividers and decoration only |
| #255AA9 text on white | 6.74:1 | AA | Lc 82.8 | Fine for body text |
| #255AA9 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CADAF2
oklch(88.4% 0.037 258.4)
-
Step 300
300
#A6C2ED
oklch(80.8% 0.068 258.9)
-
Step 400
400
#77A2E3
oklch(70.7% 0.107 258.4)
-
Step 500
500
#5389DB
oklch(63.1% 0.137 258.5)
-
Step 600
600
#3771C9
oklch(55.6% 0.15 258.7)
-
Step 700
700 (this color)
#255AA9
oklch(47.6% 0.139 258.6)
-
Step 800
800
#234D8D
oklch(42.6% 0.116 258.7)
-
Step 900
900
#224170
oklch(37.7% 0.089 258.5)
-
Step 950
950
#142642
oklch(26.9% 0.058 258.9)
#255AA9 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) | #3062AC | 0.026 |
| Deuteranopia (no green cones) | #0E56A7 | 0.019 |
| Tritanopia (no blue cones) | #006D79 | 0.108 |
| Achromatopsia (no color) | #5B5B5B | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255AA9
#255AA9
oklch(47.6% 0.139 258.6)
- #7A5400
#7A5400
oklch(47.5% 0.099 78.4)
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 #255AA9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.042
- Mid Blue #276AB3 ΔE 0.046
- Dusk Blue #26538D ΔE 0.047
- Dusky Blue #475F94 ΔE 0.052
- Light Navy Blue #2E5A88 ΔE 0.054
- Peacock Blue #016795 ΔE 0.055
- French Blue #436BAD ΔE 0.059
- Denim #3B638C ΔE 0.062
Use #255AA9 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.