#1B4E65
Closest named color: Dark Grey Blue (#29465B). oklch(40.1% 0.066 231.3), rgb(27, 78, 101).
Aa
White text reads best on this color (9.03:1).
About this color
#1B4E65 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.066 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.027 away. White text reads best on it, at 9.03:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.32:1 |
| White text | 9.03:1 |
Values
| HEX | #1B4E65 |
| RGB | rgb(27, 78, 101) |
| HSL | hsl(199, 58%, 25%) |
| OKLCH | oklch(40.1% 0.066 231.3) |
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 #1B4E65 | 9.03:1 | AAA | Lc -94.9 | Preferred for body text |
| Black text on #1B4E65 | 2.32:1 | Fails | Lc 13.4 | Not readable |
| #1B4E65 text on white | 9.03:1 | AAA | Lc 90.5 | Preferred for body text |
| #1B4E65 text on black | 2.32:1 | Fails | Lc -11.8 | 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
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C8DDE8
oklch(88.5% 0.027 230.4)
-
Step 300
300
#A1C7DB
oklch(80.9% 0.049 231.1)
-
Step 400
400
#6BAAC9
oklch(70.7% 0.079 230.7)
-
Step 500
500
#3E94BB
oklch(63.1% 0.1 231)
-
Step 600
600
#0C7EA8
oklch(55.7% 0.11 231.2)
-
Step 700
700
#006A8F
oklch(49.2% 0.1 231.3)
-
Step 800
800
#055675
oklch(42.6% 0.085 232)
-
Step 900
900 (this color)
#1B4E65
oklch(40.1% 0.066 231.3)
-
Step 950
950
#0E2A37
oklch(27% 0.041 231.2)
#1B4E65 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) | #424D66 | 0.044 |
| Deuteranopia (no green cones) | #384665 | 0.037 |
| Tritanopia (no blue cones) | #005456 | 0.039 |
| Achromatopsia (no color) | #494949 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4E65
#1B4E65
oklch(40.1% 0.066 231.3)
- #643D25
#643D25
oklch(40.1% 0.066 51.5)
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 #1B4E65, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.027
- Charcoal #264653 ΔE 0.034
- Deep Teal #00555A ΔE 0.036
- Dark Slate Gray #2F4F4F ΔE 0.041
- Dark Teal #014D4E ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.048
- Light Navy #155084 ΔE 0.052
- Petrol #005F6A ΔE 0.053
Use #1B4E65 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.