#155F9F
Closest named color: Peacock Blue (#016795). oklch(47.7% 0.124 250.1), rgb(21, 95, 159).
Aa
White text reads best on this color (6.62:1).
About this color
#155F9F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.124 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Peacock Blue (#016795), ΔE 0.031 away. White text reads best on it, at 6.62:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Peacock Blue (#016795) |
| Black text | 3.16:1 |
| White text | 6.62:1 |
Values
| HEX | #155F9F |
| RGB | rgb(21, 95, 159) |
| HSL | hsl(208, 77%, 35%) |
| OKLCH | oklch(47.7% 0.124 250.1) |
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 #155F9F | 6.62:1 | AA | Lc -87.4 | Fine for body text |
| Black text on #155F9F | 3.16:1 | AA large text | Lc 21.8 | Dividers and decoration only |
| #155F9F text on white | 6.62:1 | AA | Lc 82.3 | Fine for body text |
| #155F9F text on black | 3.16:1 | AA large text | Lc -19.6 | 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 700.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C9DBEF
oklch(88.4% 0.034 251)
-
Step 300
300
#A4C4E7
oklch(80.9% 0.061 250.9)
-
Step 400
400
#72A5DA
oklch(70.7% 0.095 250.2)
-
Step 500
500
#4A8ED0
oklch(63.2% 0.122 249.7)
-
Step 600
600
#2976BE
oklch(55.5% 0.134 250.5)
-
Step 700
700 (this color)
#155F9F
oklch(47.7% 0.124 250.1)
-
Step 800
800
#195184
oklch(42.6% 0.102 250)
-
Step 900
900
#1C446A
oklch(37.8% 0.079 249.7)
-
Step 950
950
#11283E
oklch(27% 0.05 249.3)
#155F9F 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) | #4063A2 | 0.038 |
| Deuteranopia (no green cones) | #29579E | 0.024 |
| Tritanopia (no blue cones) | #006E77 | 0.089 |
| Achromatopsia (no color) | #5D5D5D | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155F9F
#155F9F
oklch(47.7% 0.124 250.1)
- #815100
#815100
oklch(47.8% 0.103 70.5)
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 #155F9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Peacock Blue #016795 ΔE 0.031
- Denim Blue #3B5B92 ΔE 0.034
- Light Navy Blue #2E5A88 ΔE 0.039
- Dusk Blue #26538D ΔE 0.041
- Mid Blue #276AB3 ΔE 0.045
- Denim #3B638C ΔE 0.045
- Dusky Blue #475F94 ΔE 0.045
- Ocean Blue #03719C ΔE 0.054
Use #155F9F 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.