#1C3F55
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.2% 0.056 238.7), rgb(28, 63, 85).
Aa
White text reads best on this color (11.10:1).
About this color
#1C3F55 is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.056 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.016 away. White text reads best on it, at 11.10:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.89:1 |
| White text | 11.10:1 |
Values
| HEX | #1C3F55 |
| RGB | rgb(28, 63, 85) |
| HSL | hsl(203, 50%, 22%) |
| OKLCH | oklch(35.2% 0.056 238.7) |
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 #1C3F55 | 11.10:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #1C3F55 | 1.89:1 | Fails | Lc 8.4 | Not readable |
| #1C3F55 text on white | 11.10:1 | AAA | Lc 95.5 | Preferred for body text |
| #1C3F55 text on black | 1.89:1 | Fails | Lc 0.0 | Not readable |
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 900.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CCDCE7
oklch(88.6% 0.023 237.7)
-
Step 300
300
#A9C5D9
oklch(80.9% 0.041 239.1)
-
Step 400
400
#79A7C6
oklch(70.7% 0.067 238.4)
-
Step 500
500
#5591B8
oklch(63.2% 0.086 238.7)
-
Step 600
600
#387AA4
oklch(55.5% 0.094 239.5)
-
Step 700
700
#2A678C
oklch(49.1% 0.086 238.7)
-
Step 800
800
#245472
oklch(42.7% 0.072 239)
-
Step 900
900 (this color)
#1C3F55
oklch(35.2% 0.056 238.7)
-
Step 950
950
#152936
oklch(27% 0.036 238.5)
#1C3F55 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) | #353F56 | 0.031 |
| Deuteranopia (no green cones) | #2D3955 | 0.026 |
| Tritanopia (no blue cones) | #004546 | 0.042 |
| Achromatopsia (no color) | #3C3C3C | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C3F55
#1C3F55
oklch(35.2% 0.056 238.7)
- #51341C
#51341C
oklch(35.4% 0.056 59.2)
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 #1C3F55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.016
- Midnight Green #073B4C ΔE 0.027
- Charcoal #264653 ΔE 0.028
- Dark Grey Blue #29465B ΔE 0.029
- Prussian Blue #1D3557 ΔE 0.034
- Onyx #343A40 ΔE 0.043
- Gunmetal #293241 ΔE 0.048
- Marine Blue #01386A ΔE 0.051
Use #1C3F55 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.