#1B5073
Closest named color: Deep Sea Blue (#015482). oklch(41.4% 0.08 241.7), rgb(27, 80, 115).
Aa
White text reads best on this color (8.60:1).
About this color
#1B5073 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.080 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.026 away. White text reads best on it, at 8.60:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.44:1 |
| White text | 8.60:1 |
Values
| HEX | #1B5073 |
| RGB | rgb(27, 80, 115) |
| HSL | hsl(204, 62%, 28%) |
| OKLCH | oklch(41.4% 0.08 241.7) |
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 #1B5073 | 8.60:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #1B5073 | 2.44:1 | Fails | Lc 14.7 | Not readable |
| #1B5073 text on white | 8.60:1 | AAA | Lc 89.3 | Fine for body text |
| #1B5073 text on black | 2.44:1 | Fails | Lc -13.0 | 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 800.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CBDCE9
oklch(88.6% 0.026 240.7)
-
Step 300
300
#A7C5DD
oklch(80.9% 0.047 242.4)
-
Step 400
400
#76A7CC
oklch(70.7% 0.075 241.7)
-
Step 500
500
#5090BE
oklch(63% 0.096 241.7)
-
Step 600
600
#317AAB
oklch(55.6% 0.105 241.7)
-
Step 700
700
#236693
oklch(49% 0.098 242.3)
-
Step 800
800 (this color)
#1B5073
oklch(41.4% 0.08 241.7)
-
Step 900
900
#204560
oklch(37.6% 0.063 242.6)
-
Step 950
950
#132938
oklch(27% 0.04 240.2)
#1B5073 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) | #405175 | 0.040 |
| Deuteranopia (no green cones) | #344872 | 0.032 |
| Tritanopia (no blue cones) | #00595C | 0.057 |
| Achromatopsia (no color) | #4C4C4C | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B5073
#1B5073
oklch(41.4% 0.08 241.7)
- #6A4016
#6A4016
oklch(41.3% 0.08 61.8)
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 #1B5073, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.026
- Light Navy #155084 ΔE 0.029
- Dark Grey Blue #29465B ΔE 0.045
- Dusk Blue #26538D ΔE 0.045
- Twilight Blue #0A437A ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.048
- Deep Teal #00555A ΔE 0.052
- YInMn Blue #415A77 ΔE 0.054
Use #1B5073 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.