#2370B3
Closest named color: Mid Blue (#276AB3). oklch(53.3% 0.128 249.2), rgb(35, 112, 179).
Aa
White text reads best on this color (5.19:1).
About this color
#2370B3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.128 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.017 away. White text reads best on it, at 5.19:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.04:1 |
| White text | 5.19:1 |
Values
| HEX | #2370B3 |
| RGB | rgb(35, 112, 179) |
| HSL | hsl(208, 67%, 42%) |
| OKLCH | oklch(53.3% 0.128 249.2) |
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 #2370B3 | 5.19:1 | AA | Lc -80.7 | Fine for body text |
| Black text on #2370B3 | 4.04:1 | AA large text | Lc 28.7 | Dividers and decoration only |
| #2370B3 text on white | 5.19:1 | AA | Lc 75.4 | Fine for body text |
| #2370B3 text on black | 4.04:1 | AA large text | Lc -26.4 | 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 600.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CADBEE
oklch(88.5% 0.032 251.1)
-
Step 300
300
#A5C4E5
oklch(80.9% 0.058 250.2)
-
Step 400
400
#73A5D8
oklch(70.7% 0.092 249.7)
-
Step 500
500
#4C8ECE
oklch(63.1% 0.118 249.6)
-
Step 600
600 (this color)
#2370B3
oklch(53.3% 0.128 249.2)
-
Step 700
700
#1D64A1
oklch(49.2% 0.119 249.1)
-
Step 800
800
#1B5282
oklch(42.8% 0.098 248.8)
-
Step 900
900
#1D4468
oklch(37.7% 0.076 248.9)
-
Step 950
950
#12283D
oklch(27% 0.048 249)
#2370B3 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) | #5074B6 | 0.043 |
| Deuteranopia (no green cones) | #3A67B2 | 0.028 |
| Tritanopia (no blue cones) | #008089 | 0.093 |
| Achromatopsia (no color) | #6D6D6D | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2370B3
#2370B3
oklch(53.3% 0.128 249.2)
- #975E00
#975E00
oklch(53.3% 0.116 69.2)
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 #2370B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.017
- French Blue #436BAD ΔE 0.027
- Flat Blue #3C73A8 ΔE 0.028
- Nice Blue #107AB0 ΔE 0.030
- Windows Blue #3778BF ΔE 0.033
- Muted Blue #3B719F ΔE 0.036
- Ocean Blue #03719C ΔE 0.041
- Dull Blue #49759C ΔE 0.052
Use #2370B3 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.