#255F99
Closest named color: Denim Blue (#3B5B92). oklch(47.7% 0.111 251.3), rgb(37, 95, 153).
Aa
White text reads best on this color (6.61:1).
About this color
#255F99 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.111 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.022 away. White text reads best on it, at 6.61:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.17:1 |
| White text | 6.61:1 |
Values
| HEX | #255F99 |
| RGB | rgb(37, 95, 153) |
| HSL | hsl(210, 61%, 37%) |
| OKLCH | oklch(47.7% 0.111 251.3) |
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 #255F99 | 6.61:1 | AA | Lc -87.4 | Fine for body text |
| Black text on #255F99 | 3.17:1 | AA large text | Lc 21.7 | Dividers and decoration only |
| #255F99 text on white | 6.61:1 | AA | Lc 82.4 | Fine for body text |
| #255F99 text on black | 3.17:1 | AA large text | Lc -19.5 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CBDBED
oklch(88.5% 0.03 251.3)
-
Step 300
300
#A8C4E3
oklch(81% 0.053 251.1)
-
Step 400
400
#78A4D5
oklch(70.6% 0.087 251.7)
-
Step 500
500
#548DCA
oklch(63.1% 0.11 251.4)
-
Step 600
600
#3776B7
oklch(55.6% 0.12 251.5)
-
Step 700
700 (this color)
#255F99
oklch(47.7% 0.111 251.3)
-
Step 800
800
#245180
oklch(42.7% 0.093 251.7)
-
Step 900
900
#224366
oklch(37.6% 0.072 251.5)
-
Step 950
950
#15283C
oklch(27.1% 0.045 250.9)
#255F99 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) | #44639B | 0.034 |
| Deuteranopia (no green cones) | #335898 | 0.021 |
| Tritanopia (no blue cones) | #006D74 | 0.085 |
| Achromatopsia (no color) | #5D5D5D | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255F99
#255F99
oklch(47.7% 0.111 251.3)
- #805100
#805100
oklch(47.7% 0.103 71.2)
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 #255F99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.022
- Peacock Blue #016795 ΔE 0.028
- Light Navy Blue #2E5A88 ΔE 0.028
- Denim #3B638C ΔE 0.033
- Dusky Blue #475F94 ΔE 0.034
- Dusk Blue #26538D ΔE 0.037
- Mid Blue #276AB3 ΔE 0.048
- Ocean Blue #03719C ΔE 0.052
Use #255F99 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.