#1B618F
Closest named color: Peacock Blue (#016795). oklch(47.3% 0.1 242.7), rgb(27, 97, 143).
Aa
White text reads best on this color (6.66:1).
About this color
#1B618F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.100 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Peacock Blue (#016795), ΔE 0.018 away. White text reads best on it, at 6.66:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Peacock Blue (#016795) |
| Black text | 3.15:1 |
| White text | 6.66:1 |
Values
| HEX | #1B618F |
| RGB | rgb(27, 97, 143) |
| HSL | hsl(204, 68%, 33%) |
| OKLCH | oklch(47.3% 0.1 242.7) |
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 #1B618F | 6.66:1 | AA | Lc -87.6 | Fine for body text |
| Black text on #1B618F | 3.15:1 | AA large text | Lc 21.5 | Dividers and decoration only |
| #1B618F text on white | 6.66:1 | AA | Lc 82.5 | Fine for body text |
| #1B618F text on black | 3.15:1 | AA large text | Lc -19.4 | 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 700.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEA
oklch(88.5% 0.027 241.2)
-
Step 300
300
#A6C5DE
oklch(80.9% 0.049 242.6)
-
Step 400
400
#75A7CD
oklch(70.7% 0.077 241.9)
-
Step 500
500
#4F90C1
oklch(63.1% 0.1 243.1)
-
Step 600
600
#307AAD
oklch(55.7% 0.107 242.5)
-
Step 700
700 (this color)
#1B618F
oklch(47.3% 0.1 242.7)
-
Step 800
800
#1E5378
oklch(42.5% 0.083 242.8)
-
Step 900
900
#1F4561
oklch(37.6% 0.065 243)
-
Step 950
950
#132939
oklch(27.1% 0.041 242)
#1B618F 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) | #4B6291 | 0.046 |
| Deuteranopia (no green cones) | #3B588E | 0.034 |
| Tritanopia (no blue cones) | #006C71 | 0.069 |
| Achromatopsia (no color) | #5C5C5C | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B618F
#1B618F
oklch(47.3% 0.1 242.7)
- #834D11
#834D11
oklch(47.4% 0.101 62.4)
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 #1B618F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Peacock Blue #016795 ΔE 0.018
- Light Navy Blue #2E5A88 ΔE 0.023
- Denim #3B638C ΔE 0.028
- Denim Blue #3B5B92 ΔE 0.031
- Dusk Blue #26538D ΔE 0.041
- Dusky Blue #475F94 ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.045
- Ocean Blue #03719C ΔE 0.047
Use #1B618F 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.