#4370E8
Closest named color: Royal Blue (#4169E1). oklch(58% 0.189 265.4), rgb(67, 112, 232).
Aa
Black text reads best on this color (4.72:1).
About this color
#4370E8 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.189 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.020 away. Black text reads best on it, at 4.72:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.189) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.72:1 |
| White text | 4.44:1 |
Values
| HEX | #4370E8 |
| RGB | rgb(67, 112, 232) |
| HSL | hsl(224, 78%, 59%) |
| OKLCH | oklch(58% 0.189 265.4) |
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 #4370E8 | 4.44:1 | AA large text | Lc -75.9 | Fine for body text |
| Black text on #4370E8 | 4.72:1 | AA | Lc 33.7 | Non-text elements, placeholder text |
| #4370E8 text on white | 4.44:1 | AA large text | Lc 70.4 | Content text, not long reading |
| #4370E8 text on black | 4.72:1 | AA | Lc -31.2 | 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 600.
-
Step 50
50
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9F9
oklch(88.4% 0.047 265.5)
-
Step 300
300
#A6C0F8
oklch(80.8% 0.085 265.2)
-
Step 400
400
#779DF5
oklch(70.6% 0.136 265.4)
-
Step 500
500
#5682F1
oklch(63.1% 0.173 265.5)
-
Step 600
600 (this color)
#4370E8
oklch(58% 0.189 265.4)
-
Step 700
700
#2F56C2
oklch(49% 0.175 265.3)
-
Step 800
800
#28479D
oklch(42.7% 0.145 265.6)
-
Step 900
900
#243D7D
oklch(37.8% 0.113 265.3)
-
Step 950
950
#152449
oklch(27% 0.072 265.3)
#4370E8 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) | #1F7FEC | 0.040 |
| Deuteranopia (no green cones) | #0070E6 | 0.035 |
| Tritanopia (no blue cones) | #008DA1 | 0.152 |
| Achromatopsia (no color) | #777777 | 0.189 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4370E8
#4370E8
oklch(58% 0.189 265.4)
- #9A7400
#9A7400
oklch(58.1% 0.119 85.6)
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 #4370E8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.020
- Cerulean Blue #056EEE ΔE 0.036
- Neon Blue #4361EE ΔE 0.037
- Clear Blue #247AFD ΔE 0.040
- Bright Blue #0165FC ΔE 0.056
- Cornflower #6A79F7 ΔE 0.057
- Azul #1D5DEC ΔE 0.059
- Warm Blue #4B57DB ΔE 0.061
Use #4370E8 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.