#1B4A5D
Closest named color: Dark Grey Blue (#29465B). oklch(38.6% 0.06 228.1), rgb(27, 74, 93).
Aa
White text reads best on this color (9.61:1).
About this color
#1B4A5D is a dark, muted teal or cyan. In OKLCH its lightness is 39%, its chroma 0.060 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.017 away. White text reads best on it, at 9.61:1.
| Hue family | Teals and cyans |
| Lightness | dark (39%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.18:1 |
| White text | 9.61:1 |
Values
| HEX | #1B4A5D |
| RGB | rgb(27, 74, 93) |
| HSL | hsl(197, 55%, 24%) |
| OKLCH | oklch(38.6% 0.06 228.1) |
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 #1B4A5D | 9.61:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #1B4A5D | 2.18:1 | Fails | Lc 11.9 | Not readable |
| #1B4A5D text on white | 9.61:1 | AAA | Lc 92.1 | Preferred for body text |
| #1B4A5D text on black | 2.18:1 | Fails | Lc -10.3 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C9DDE6
oklch(88.5% 0.025 226.5)
-
Step 300
300
#A3C7D8
oklch(80.9% 0.045 228.2)
-
Step 400
400
#70AAC4
oklch(70.8% 0.071 228)
-
Step 500
500
#4594B5
oklch(63.1% 0.092 228.2)
-
Step 600
600
#1E7EA1
oklch(55.6% 0.099 228.1)
-
Step 700
700
#0C6A8A
oklch(49.1% 0.093 228.4)
-
Step 800
800
#115770
oklch(42.8% 0.077 227.7)
-
Step 900
900 (this color)
#1B4A5D
oklch(38.6% 0.06 228.1)
-
Step 950
950
#102A35
oklch(27% 0.038 228.2)
#1B4A5D 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) | #40495E | 0.043 |
| Deuteranopia (no green cones) | #37425D | 0.038 |
| Tritanopia (no blue cones) | #004F50 | 0.035 |
| Achromatopsia (no color) | #454545 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4A5D
#1B4A5D
oklch(38.6% 0.06 228.1)
- #5E3A27
#5E3A27
oklch(38.7% 0.059 48.2)
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 #1B4A5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.017
- Charcoal #264653 ΔE 0.019
- Dark Teal #014D4E ΔE 0.035
- Dark Slate Gray #2F4F4F ΔE 0.038
- Deep Teal #00555A ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.050
- Dark Blue Green #005249 ΔE 0.052
- Charcoal Grey #3C4142 ΔE 0.055
Use #1B4A5D 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.