#255DA1
Closest named color: Denim Blue (#3B5B92). oklch(47.8% 0.124 255.2), rgb(37, 93, 161).
Aa
White text reads best on this color (6.64:1).
About this color
#255DA1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.124 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.029 away. White text reads best on it, at 6.64:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.15:1 |
| White text | 6.64:1 |
Values
| HEX | #255DA1 |
| RGB | rgb(37, 93, 161) |
| HSL | hsl(213, 63%, 39%) |
| OKLCH | oklch(47.8% 0.124 255.2) |
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 #255DA1 | 6.64:1 | AA | Lc -87.5 | Fine for body text |
| Black text on #255DA1 | 3.15:1 | AA large text | Lc 21.6 | Dividers and decoration only |
| #255DA1 text on white | 6.64:1 | AA | Lc 82.5 | Fine for body text |
| #255DA1 text on black | 3.15:1 | AA large text | Lc -19.4 | 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
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CBDBEF
oklch(88.6% 0.033 254)
-
Step 300
300
#A7C3E8
oklch(80.9% 0.061 255.5)
-
Step 400
400
#77A3DC
oklch(70.6% 0.097 255.2)
-
Step 500
500
#538BD2
oklch(63% 0.123 255.1)
-
Step 600
600
#3774C0
oklch(55.6% 0.134 255.3)
-
Step 700
700 (this color)
#255DA1
oklch(47.8% 0.124 255.2)
-
Step 800
800
#234F86
oklch(42.6% 0.104 255.4)
-
Step 900
900
#22426B
oklch(37.6% 0.08 255.5)
-
Step 950
950
#14273F
oklch(27% 0.052 255)
#255DA1 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) | #3C63A4 | 0.030 |
| Deuteranopia (no green cones) | #2657A0 | 0.017 |
| Tritanopia (no blue cones) | #006D77 | 0.095 |
| Achromatopsia (no color) | #5C5C5C | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255DA1
#255DA1
oklch(47.8% 0.124 255.2)
- #7D5300
#7D5300
oklch(47.7% 0.1 75.2)
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 #255DA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.029
- Peacock Blue #016795 ΔE 0.040
- Dusk Blue #26538D ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.040
- Dusky Blue #475F94 ΔE 0.041
- Mid Blue #276AB3 ΔE 0.044
- Denim #3B638C ΔE 0.046
- French Blue #436BAD ΔE 0.054
Use #255DA1 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.