#1B4E63
Closest named color: Dark Grey Blue (#29465B). oklch(40% 0.064 228.9), rgb(27, 78, 99).
Aa
White text reads best on this color (9.06:1).
About this color
#1B4E63 is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.064 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.026 away. White text reads best on it, at 9.06:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.31:1 |
| White text | 9.06:1 |
Values
| HEX | #1B4E63 |
| RGB | rgb(27, 78, 99) |
| HSL | hsl(197, 57%, 25%) |
| OKLCH | oklch(40% 0.064 228.9) |
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 #1B4E63 | 9.06:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #1B4E63 | 2.31:1 | Fails | Lc 13.4 | Not readable |
| #1B4E63 text on white | 9.06:1 | AAA | Lc 90.6 | Preferred for body text |
| #1B4E63 text on black | 2.31:1 | Fails | Lc -11.7 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C8DDE7
oklch(88.5% 0.026 227.9)
-
Step 300
300
#A1C7DA
oklch(80.8% 0.049 229.7)
-
Step 400
400
#6CAAC7
oklch(70.7% 0.077 229.3)
-
Step 500
500
#3E95B9
oklch(63.2% 0.098 228.7)
-
Step 600
600
#0D7EA5
oklch(55.5% 0.107 229.3)
-
Step 700
700
#006A8C
oklch(49% 0.097 229.1)
-
Step 800
800
#065773
oklch(42.8% 0.082 229.2)
-
Step 900
900 (this color)
#1B4E63
oklch(40% 0.064 228.9)
-
Step 950
950
#0E2A36
oklch(27% 0.04 229.1)
#1B4E63 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) | #434D64 | 0.045 |
| Deuteranopia (no green cones) | #394563 | 0.040 |
| Tritanopia (no blue cones) | #005455 | 0.038 |
| Achromatopsia (no color) | #494949 | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4E63
#1B4E63
oklch(40% 0.064 228.9)
- #633D28
#633D28
oklch(40% 0.063 49.2)
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 #1B4E63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.026
- Charcoal #264653 ΔE 0.032
- Deep Teal #00555A ΔE 0.033
- Dark Slate Gray #2F4F4F ΔE 0.038
- Dark Teal #014D4E ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.051
- Petrol #005F6A ΔE 0.052
- Dark Blue Green #005249 ΔE 0.054
Use #1B4E63 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.