#398DB5
Closest named color: Blue NCS (#118AB2). oklch(61% 0.1 232.5), rgb(57, 141, 181).
Aa
Black text reads best on this color (5.65:1).
About this color
#398DB5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.100 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.023 away. Black text reads best on it, at 5.65:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.65:1 |
| White text | 3.71:1 |
Values
| HEX | #398DB5 |
| RGB | rgb(57, 141, 181) |
| HSL | hsl(199, 52%, 47%) |
| OKLCH | oklch(61% 0.1 232.5) |
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 #398DB5 | 3.71:1 | AA large text | Lc -70.0 | Content text, not long reading |
| Black text on #398DB5 | 5.65:1 | AA | Lc 39.6 | Non-text elements, placeholder text |
| #398DB5 text on white | 3.71:1 | AA large text | Lc 64.5 | Content text, not long reading |
| #398DB5 text on black | 5.65:1 | AA | Lc -37.2 | 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
#C8DDE8
oklch(88.5% 0.027 230.4)
-
Step 300
300
#A2C7DB
oklch(80.9% 0.049 231.7)
-
Step 400
400
#6DA9CA
oklch(70.6% 0.079 233.5)
-
Step 500
500 (this color)
#398DB5
oklch(61% 0.1 232.5)
-
Step 600
600
#147DA8
oklch(55.5% 0.109 232.7)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#0A5675
oklch(42.7% 0.084 232.7)
-
Step 900
900
#15475E
oklch(37.6% 0.065 232.4)
-
Step 950
950
#0E2A37
oklch(27% 0.041 231.2)
#398DB5 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) | #798BB7 | 0.066 |
| Deuteranopia (no green cones) | #687FB4 | 0.056 |
| Tritanopia (no blue cones) | #00989A | 0.064 |
| Achromatopsia (no color) | #848484 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #398DB5
#398DB5
oklch(61% 0.1 232.5)
- #B27147
#B27147
oklch(60.9% 0.1 52.7)
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 #398DB5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.023
- Cool Blue #4984B8 ΔE 0.029
- Steel Blue #4682B4 ΔE 0.032
- Off Blue #5684AE ΔE 0.032
- Dusty Blue #5A86AD ΔE 0.032
- Faded Blue #658CBB ΔE 0.043
- Teal Blue #01889F ΔE 0.045
- Water Blue #0E87CC ΔE 0.047
Use #398DB5 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.