#1F4155
Closest named color: Charcoal (#264653). oklch(35.9% 0.053 236.6), rgb(31, 65, 85).
Aa
White text reads best on this color (10.79:1).
About this color
#1F4155 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.053 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal (#264653), ΔE 0.020 away. White text reads best on it, at 10.79:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Charcoal (#264653) |
| Black text | 1.94:1 |
| White text | 10.79:1 |
Values
| HEX | #1F4155 |
| RGB | rgb(31, 65, 85) |
| HSL | hsl(202, 47%, 23%) |
| OKLCH | oklch(35.9% 0.053 236.6) |
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 #1F4155 | 10.79:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #1F4155 | 1.94:1 | Fails | Lc 9.0 | Not readable |
| #1F4155 text on white | 10.79:1 | AAA | Lc 94.9 | Preferred for body text |
| #1F4155 text on black | 1.94:1 | Fails | Lc -7.7 | 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
#CCDCE6
oklch(88.5% 0.022 235)
-
Step 300
300
#A9C5D7
oklch(80.8% 0.04 236.2)
-
Step 400
400
#7BA7C3
oklch(70.7% 0.063 236.7)
-
Step 500
500
#5791B4
oklch(63.1% 0.081 236.5)
-
Step 600
600
#3A7BA0
oklch(55.6% 0.088 236.3)
-
Step 700
700
#2C6789
oklch(49% 0.082 237.1)
-
Step 800
800
#26546F
oklch(42.6% 0.067 237.1)
-
Step 900
900 (this color)
#1F4155
oklch(35.9% 0.053 236.6)
-
Step 950
950
#162935
oklch(27.1% 0.033 237.5)
#1F4155 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) | #384156 | 0.032 |
| Deuteranopia (no green cones) | #303B55 | 0.027 |
| Tritanopia (no blue cones) | #004648 | 0.038 |
| Achromatopsia (no color) | #3D3D3D | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4155
#1F4155
oklch(35.9% 0.053 236.6)
- #523520
#523520
oklch(35.8% 0.053 56)
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 #1F4155, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal #264653 ΔE 0.020
- Dark Blue Grey #1F3B4D ΔE 0.021
- Dark Grey Blue #29465B ΔE 0.022
- Midnight Green #073B4C ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.041
- Onyx #343A40 ΔE 0.042
- Dark Teal #014D4E ΔE 0.047
- Charcoal Grey #3C4142 ΔE 0.048
Use #1F4155 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.