#255EB9
Closest named color: Mid Blue (#276AB3). oklch(49.7% 0.156 259.6), rgb(37, 94, 185).
Aa
White text reads best on this color (6.21:1).
About this color
#255EB9 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.156 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.036 away. White text reads best on it, at 6.21:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.38:1 |
| White text | 6.21:1 |
Values
| HEX | #255EB9 |
| RGB | rgb(37, 94, 185) |
| HSL | hsl(217, 67%, 44%) |
| OKLCH | oklch(49.7% 0.156 259.6) |
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 #255EB9 | 6.21:1 | AA | Lc -85.7 | Fine for body text |
| Black text on #255EB9 | 3.38:1 | AA large text | Lc 23.6 | Dividers and decoration only |
| #255EB9 text on white | 6.21:1 | AA | Lc 80.5 | Fine for body text |
| #255EB9 text on black | 3.38:1 | AA large text | Lc -21.3 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C9DAF5
oklch(88.4% 0.042 259.6)
-
Step 300
300
#A4C2F2
oklch(80.9% 0.076 259.7)
-
Step 400
400
#73A1EB
oklch(70.7% 0.12 259.6)
-
Step 500
500
#4E88E5
oklch(63.2% 0.153 259.4)
-
Step 600
600
#316FD3
oklch(55.6% 0.167 259.6)
-
Step 700
700 (this color)
#255EB9
oklch(49.7% 0.156 259.6)
-
Step 800
800
#1F4C94
oklch(42.7% 0.129 259.5)
-
Step 900
900
#1F4076
oklch(37.7% 0.1 259.8)
-
Step 950
950
#132645
oklch(27.1% 0.063 259.7)
#255EB9 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) | #2868BC | 0.028 |
| Deuteranopia (no green cones) | #005BB7 | 0.020 |
| Tritanopia (no blue cones) | #007482 | 0.121 |
| Achromatopsia (no color) | #616161 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255EB9
#255EB9
oklch(49.7% 0.156 259.6)
- #815A00
#815A00
oklch(49.6% 0.103 79.3)
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 #255EB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.036
- French Blue #436BAD ΔE 0.054
- Denim Blue #3B5B92 ΔE 0.063
- Dusky Blue #475F94 ΔE 0.067
- Warm Blue #4B57DB ΔE 0.068
- Peacock Blue #016795 ΔE 0.069
- Blue Blue #2242C7 ΔE 0.072
- Iris #6258C4 ΔE 0.073
Use #255EB9 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.