#1B2830
Closest named color: Dark (#1B2431). oklch(26.9% 0.023 235.8), rgb(27, 40, 48).
Aa
White text reads best on this color (15.07:1).
About this color
#1B2830 is a dark close to neutral grey. In OKLCH its lightness is 27%, its chroma 0.023. It has too little chroma to lean warm or cool. The nearest named color is Dark (#1B2431), ΔE 0.015 away. White text reads best on it, at 15.07:1.
| Hue family | Neutrals |
| Lightness | dark (27%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Dark (#1B2431) |
| Black text | 1.39:1 |
| White text | 15.07:1 |
Values
| HEX | #1B2830 |
| RGB | rgb(27, 40, 48) |
| HSL | hsl(203, 28%, 15%) |
| OKLCH | oklch(26.9% 0.023 235.8) |
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 #1B2830 | 15.07:1 | AAA | Lc -104.7 | Preferred for body text |
| Black text on #1B2830 | 1.39:1 | Fails | Lc 0.0 | Not readable |
| #1B2830 text on white | 15.07:1 | AAA | Lc 101.9 | Preferred for body text |
| #1B2830 text on black | 1.39:1 | 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 950.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D0DBE2
oklch(88.5% 0.015 235.4)
-
Step 300
300
#B0C4D0
oklch(80.9% 0.028 234.1)
-
Step 400
400
#87A5B9
oklch(70.6% 0.044 237.4)
-
Step 500
500
#688FA7
oklch(63% 0.056 235.9)
-
Step 600
600
#4F7993
oklch(55.6% 0.062 236.6)
-
Step 700
700
#40667D
oklch(49.1% 0.057 236.2)
-
Step 800
800
#355365
oklch(42.6% 0.047 235.7)
-
Step 900
900
#2E4553
oklch(37.7% 0.037 235.8)
-
Step 950
950 (this color)
#1B2830
oklch(26.9% 0.023 235.8)
#1B2830 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) | #242830 | 0.014 |
| Deuteranopia (no green cones) | #212530 | 0.013 |
| Tritanopia (no blue cones) | #142A2B | 0.017 |
| Achromatopsia (no color) | #262626 | 0.023 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B2830
#1B2830
oklch(26.9% 0.023 235.8)
- #2F231B
#2F231B
oklch(26.8% 0.023 55.2)
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 #1B2830, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.015
- Jet #212529 ΔE 0.016
- Oxford Blue #1B263B ΔE 0.024
- Space Cadet #2B2D42 ΔE 0.045
- Gunmetal #293241 ΔE 0.049
- Rich Black #0D1B2A ΔE 0.053
- Midnight Green #073B4C ΔE 0.070
- Dark Blue Grey #1F3B4D ΔE 0.074
Use #1B2830 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.