#308CB5
Closest named color: Blue NCS (#118AB2). oklch(60.4% 0.105 231.7), rgb(48, 140, 181).
Aa
Black text reads best on this color (5.54:1).
About this color
#308CB5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.105 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.016 away. Black text reads best on it, at 5.54:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.54:1 |
| White text | 3.78:1 |
Values
| HEX | #308CB5 |
| RGB | rgb(48, 140, 181) |
| HSL | hsl(198, 58%, 45%) |
| OKLCH | oklch(60.4% 0.105 231.7) |
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 #308CB5 | 3.78:1 | AA large text | Lc -70.6 | Content text, not long reading |
| Black text on #308CB5 | 5.54:1 | AA | Lc 39.0 | Non-text elements, placeholder text |
| #308CB5 text on white | 3.78:1 | AA large text | Lc 65.1 | Content text, not long reading |
| #308CB5 text on black | 5.54:1 | AA | Lc -36.6 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C7DDE9
oklch(88.5% 0.029 231.5)
-
Step 300
300
#A0C7DC
oklch(80.8% 0.051 231.7)
-
Step 400
400
#69AACB
oklch(70.7% 0.082 231.7)
-
Step 500
500 (this color)
#308CB5
oklch(60.4% 0.105 231.7)
-
Step 600
600
#007EA9
oklch(55.6% 0.112 231.2)
-
Step 700
700
#006A8F
oklch(49.2% 0.1 231.3)
-
Step 800
800
#005676
oklch(42.6% 0.087 232.3)
-
Step 900
900
#10485F
oklch(37.8% 0.068 230.5)
-
Step 950
950
#0C2A38
oklch(27% 0.044 231.9)
#308CB5 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) | #778AB7 | 0.069 |
| Deuteranopia (no green cones) | #657DB4 | 0.060 |
| Tritanopia (no blue cones) | #00979A | 0.063 |
| Achromatopsia (no color) | #838383 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #308CB5
#308CB5
oklch(60.4% 0.105 231.7)
- #B36E43
#B36E43
oklch(60.4% 0.105 51.5)
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 #308CB5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.016
- Cool Blue #4984B8 ΔE 0.029
- Steel Blue #4682B4 ΔE 0.030
- Off Blue #5684AE ΔE 0.034
- Dusty Blue #5A86AD ΔE 0.036
- Teal Blue #01889F ΔE 0.041
- Water Blue #0E87CC ΔE 0.043
- Faded Blue #658CBB ΔE 0.049
Use #308CB5 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.