#437CF4
Closest named color: Clear Blue (#247AFD). oklch(61.2% 0.19 262.9), rgb(67, 124, 244).
Aa
Black text reads best on this color (5.42:1).
About this color
#437CF4 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.190 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.025 away. Black text reads best on it, at 5.42:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.190) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.42:1 |
| White text | 3.86:1 |
Values
| HEX | #437CF4 |
| RGB | rgb(67, 124, 244) |
| HSL | hsl(221, 89%, 61%) |
| OKLCH | oklch(61.2% 0.19 262.9) |
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 #437CF4 | 3.86:1 | AA large text | Lc -71.2 | Content text, not long reading |
| Black text on #437CF4 | 5.42:1 | AA | Lc 38.4 | Non-text elements, placeholder text |
| #437CF4 text on white | 3.86:1 | AA large text | Lc 65.7 | Content text, not long reading |
| #437CF4 text on black | 5.42:1 | AA | Lc -35.9 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFD
oklch(93.5% 0.028 263.4)
-
Step 200
200
#C7DAFC
oklch(88.5% 0.051 262.1)
-
Step 300
300
#A1C1FD
oklch(80.9% 0.092 262.7)
-
Step 400
400
#6E9EFD
oklch(70.7% 0.149 262.9)
-
Step 500
500 (this color)
#437CF4
oklch(61.2% 0.19 262.9)
-
Step 600
600
#2C68EA
oklch(55.7% 0.207 262.9)
-
Step 700
700
#1F55CB
oklch(49% 0.192 262.9)
-
Step 800
800
#1C46A4
oklch(42.6% 0.159 263.2)
-
Step 900
900
#1C3C82
oklch(37.6% 0.124 263.2)
-
Step 950
950
#11244C
oklch(27% 0.078 263.1)
#437CF4 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) | #358AF8 | 0.035 |
| Deuteranopia (no green cones) | #007AF2 | 0.033 |
| Tritanopia (no blue cones) | #0099AC | 0.152 |
| Achromatopsia (no color) | #828282 | 0.190 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #437CF4
#437CF4
oklch(61.2% 0.19 262.9)
- #A87B00
#A87B00
oklch(61.1% 0.126 82.8)
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 #437CF4, closest first.
No curated palette has a color within ΔE 0.04 of #437CF4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.025
- Cornflower #6A79F7 ΔE 0.042
- Dodger Blue #1E90FF ΔE 0.051
- Soft Blue #6488EA ΔE 0.052
- Cerulean Blue #056EEE ΔE 0.053
- Royal Blue #4169E1 ΔE 0.054
- Dark Sky Blue #448EE4 ΔE 0.056
- Neon Blue #4361EE ΔE 0.065
Use #437CF4 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.