#1B4D64
Closest named color: Dark Grey Blue (#29465B). oklch(39.8% 0.065 231.7), rgb(27, 77, 100).
Aa
White text reads best on this color (9.16:1).
About this color
#1B4D64 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.065 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.025 away. White text reads best on it, at 9.16:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.29:1 |
| White text | 9.16:1 |
Values
| HEX | #1B4D64 |
| RGB | rgb(27, 77, 100) |
| HSL | hsl(199, 57%, 25%) |
| OKLCH | oklch(39.8% 0.065 231.7) |
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 #1B4D64 | 9.16:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #1B4D64 | 2.29:1 | Fails | Lc 13.1 | Not readable |
| #1B4D64 text on white | 9.16:1 | AAA | Lc 90.9 | Preferred for body text |
| #1B4D64 text on black | 2.29:1 | Fails | Lc -11.5 | 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
#A2C7DB
oklch(80.9% 0.049 231.7)
-
Step 400
400
#6CAAC9
oklch(70.8% 0.078 231.1)
-
Step 500
500
#3F94BB
oklch(63.1% 0.1 231.2)
-
Step 600
600
#117EA8
oklch(55.7% 0.109 231.6)
-
Step 700
700
#006A8F
oklch(49.2% 0.1 231.3)
-
Step 800
800
#085675
oklch(42.6% 0.084 232.4)
-
Step 900
900 (this color)
#1B4D64
oklch(39.8% 0.065 231.7)
-
Step 950
950
#0E2A37
oklch(27% 0.041 231.2)
#1B4D64 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) | #424C65 | 0.044 |
| Deuteranopia (no green cones) | #374564 | 0.037 |
| Tritanopia (no blue cones) | #005355 | 0.039 |
| Achromatopsia (no color) | #484848 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4D64
#1B4D64
oklch(39.8% 0.065 231.7)
- #633C25
#633C25
oklch(39.7% 0.065 50.5)
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 #1B4D64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.025
- Charcoal #264653 ΔE 0.031
- Deep Teal #00555A ΔE 0.037
- Dark Slate Gray #2F4F4F ΔE 0.042
- Dark Teal #014D4E ΔE 0.043
- Deep Sea Blue #015482 ΔE 0.050
- Light Navy #155084 ΔE 0.053
- Twilight Blue #0A437A ΔE 0.056
Use #1B4D64 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.