#1B5974
Closest named color: Petrol (#005F6A). oklch(43.8% 0.076 231.2), rgb(27, 89, 116).
Aa
White text reads best on this color (7.69:1).
About this color
#1B5974 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.076 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.031 away. White text reads best on it, at 7.69:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.72:1 |
| White text | 7.69:1 |
Values
| HEX | #1B5974 |
| RGB | rgb(27, 89, 116) |
| HSL | hsl(198, 62%, 28%) |
| OKLCH | oklch(43.8% 0.076 231.2) |
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 #1B5974 | 7.69:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #1B5974 | 2.72:1 | Fails | Lc 17.6 | Dividers and decoration only |
| #1B5974 text on white | 7.69:1 | AAA | Lc 86.5 | Fine for body text |
| #1B5974 text on black | 2.72:1 | Fails | Lc -15.6 | Dividers and decoration only |
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
#E2ECF1
oklch(93.7% 0.013 228.9)
-
Step 200
200
#CADCE7
oklch(88.4% 0.025 234.5)
-
Step 300
300
#A5C6D8
oklch(80.8% 0.044 231.9)
-
Step 400
400
#72A9C5
oklch(70.7% 0.071 231.2)
-
Step 500
500
#4993B6
oklch(63% 0.09 231.1)
-
Step 600
600
#267DA2
oklch(55.6% 0.098 231)
-
Step 700
700
#17698B
oklch(49% 0.091 231.5)
-
Step 800
800 (this color)
#1B5974
oklch(43.8% 0.076 231.2)
-
Step 900
900
#1B475B
oklch(37.7% 0.059 230.9)
-
Step 950
950
#112A35
oklch(27.1% 0.037 229)
#1B5974 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) | #4B5875 | 0.050 |
| Deuteranopia (no green cones) | #3F4F74 | 0.044 |
| Tritanopia (no blue cones) | #006062 | 0.044 |
| Achromatopsia (no color) | #535353 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B5974
#1B5974
oklch(43.8% 0.076 231.2)
- #734529
#734529
oklch(43.8% 0.076 51)
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 #1B5974, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.031
- Deep Sea Blue #015482 ΔE 0.033
- YInMn Blue #415A77 ΔE 0.038
- Light Navy Blue #2E5A88 ΔE 0.038
- Light Navy #155084 ΔE 0.044
- Deep Teal #00555A ΔE 0.047
- Dusk Blue #26538D ΔE 0.050
- Denim #3B638C ΔE 0.057
Use #1B5974 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.