#255DAA
Closest named color: Mid Blue (#276AB3). oklch(48.4% 0.137 257.4), rgb(37, 93, 170).
Aa
White text reads best on this color (6.51:1).
About this color
#255DAA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.137 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.038 away. White text reads best on it, at 6.51:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.22:1 |
| White text | 6.51:1 |
Values
| HEX | #255DAA |
| RGB | rgb(37, 93, 170) |
| HSL | hsl(215, 64%, 41%) |
| OKLCH | oklch(48.4% 0.137 257.4) |
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 #255DAA | 6.51:1 | AA | Lc -87.0 | Fine for body text |
| Black text on #255DAA | 3.22:1 | AA large text | Lc 22.2 | Dividers and decoration only |
| #255DAA text on white | 6.51:1 | AA | Lc 81.9 | Fine for body text |
| #255DAA text on black | 3.22:1 | AA large text | Lc -20.0 | 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
#CADBF2
oklch(88.6% 0.037 256)
-
Step 300
300
#A6C3EC
oklch(81% 0.066 257)
-
Step 400
400
#76A2E2
oklch(70.6% 0.106 257.7)
-
Step 500
500
#518ADA
oklch(63.1% 0.135 257.1)
-
Step 600
600
#3572C7
oklch(55.6% 0.146 257.4)
-
Step 700
700 (this color)
#255DAA
oklch(48.4% 0.137 257.4)
-
Step 800
800
#224E8C
oklch(42.7% 0.114 257.5)
-
Step 900
900
#214170
oklch(37.6% 0.089 258)
-
Step 950
950
#142741
oklch(27.1% 0.055 256.6)
#255DAA 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) | #3564AD | 0.026 |
| Deuteranopia (no green cones) | #1858A8 | 0.018 |
| Tritanopia (no blue cones) | #006F7B | 0.105 |
| Achromatopsia (no color) | #5E5E5E | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255DAA
#255DAA
oklch(48.4% 0.137 257.4)
- #7E5600
#7E5600
oklch(48.4% 0.101 77.5)
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 #255DAA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.038
- Denim Blue #3B5B92 ΔE 0.041
- Dusky Blue #475F94 ΔE 0.049
- Peacock Blue #016795 ΔE 0.050
- Dusk Blue #26538D ΔE 0.051
- French Blue #436BAD ΔE 0.052
- Light Navy Blue #2E5A88 ΔE 0.054
- Denim #3B638C ΔE 0.058
Use #255DAA 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.