#255FAF
Closest named color: Mid Blue (#276AB3). oklch(49.2% 0.141 257.5), rgb(37, 95, 175).
Aa
White text reads best on this color (6.29:1).
About this color
#255FAF is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.141 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.031 away. White text reads best on it, at 6.29:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.33:1 |
| White text | 6.29:1 |
Values
| HEX | #255FAF |
| RGB | rgb(37, 95, 175) |
| HSL | hsl(215, 65%, 42%) |
| OKLCH | oklch(49.2% 0.141 257.5) |
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 #255FAF | 6.29:1 | AA | Lc -86.1 | Fine for body text |
| Black text on #255FAF | 3.33:1 | AA large text | Lc 23.1 | Dividers and decoration only |
| #255FAF text on white | 6.29:1 | AA | Lc 80.9 | Fine for body text |
| #255FAF text on black | 3.33:1 | AA large text | Lc -20.9 | 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
#CADBF3
oklch(88.6% 0.038 257)
-
Step 300
300
#A5C3ED
oklch(81% 0.068 256.8)
-
Step 400
400
#74A2E4
oklch(70.6% 0.109 257.4)
-
Step 500
500
#4F8ADC
oklch(63.2% 0.139 257)
-
Step 600
600
#3272CA
oklch(55.7% 0.151 257.2)
-
Step 700
700 (this color)
#255FAF
oklch(49.2% 0.141 257.5)
-
Step 800
800
#204E8D
oklch(42.7% 0.116 257.2)
-
Step 900
900
#204171
oklch(37.7% 0.091 257.9)
-
Step 950
950
#132742
oklch(27.1% 0.057 256.4)
#255FAF 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) | #3567B2 | 0.028 |
| Deuteranopia (no green cones) | #155AAD | 0.019 |
| Tritanopia (no blue cones) | #00727E | 0.109 |
| Achromatopsia (no color) | #606060 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255FAF
#255FAF
oklch(49.2% 0.141 257.5)
- #815800
#815800
oklch(49.2% 0.103 77.4)
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 #255FAF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.031
- French Blue #436BAD ΔE 0.047
- Denim Blue #3B5B92 ΔE 0.048
- Dusky Blue #475F94 ΔE 0.053
- Peacock Blue #016795 ΔE 0.054
- Dusk Blue #26538D ΔE 0.060
- Light Navy Blue #2E5A88 ΔE 0.062
- Denim #3B638C ΔE 0.062
Use #255FAF 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.