#237BEF
Closest named color: Clear Blue (#247AFD). oklch(59.7% 0.193 257.5), rgb(35, 123, 239).
Aa
Black text reads best on this color (5.15:1).
About this color
#237BEF is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.193 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.021 away. Black text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.193) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.15:1 |
| White text | 4.07:1 |
Values
| HEX | #237BEF |
| RGB | rgb(35, 123, 239) |
| HSL | hsl(214, 86%, 54%) |
| OKLCH | oklch(59.7% 0.193 257.5) |
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 #237BEF | 4.07:1 | AA large text | Lc -72.8 | Content text, not long reading |
| Black text on #237BEF | 5.15:1 | AA | Lc 36.7 | Non-text elements, placeholder text |
| #237BEF text on white | 4.07:1 | AA large text | Lc 67.3 | Content text, not long reading |
| #237BEF text on black | 5.15:1 | AA | Lc -34.3 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C4DBFC
oklch(88.5% 0.052 257.4)
-
Step 300
300
#9AC3FD
oklch(80.9% 0.094 257.1)
-
Step 400
400
#61A1FD
oklch(70.7% 0.151 257.6)
-
Step 500
500 (this color)
#237BEF
oklch(59.7% 0.193 257.5)
-
Step 600
600
#006DE6
oklch(55.7% 0.202 257.5)
-
Step 700
700
#005BC2
oklch(49% 0.177 257.5)
-
Step 800
800
#004AA1
oklch(42.6% 0.155 257.6)
-
Step 900
900
#0A3F82
oklch(37.7% 0.125 257.3)
-
Step 950
950
#09254C
oklch(26.9% 0.08 257.7)
#237BEF 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) | #3487F3 | 0.035 |
| Deuteranopia (no green cones) | #0075ED | 0.021 |
| Tritanopia (no blue cones) | #0097A9 | 0.146 |
| Achromatopsia (no color) | #7E7E7E | 0.193 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #237BEF
#237BEF
oklch(59.7% 0.193 257.5)
- #A87400
#A87400
oklch(59.7% 0.125 77.5)
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 #237BEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.021
- Cerulean Blue #056EEE ΔE 0.036
- Royal Blue #4169E1 ΔE 0.048
- Dodger Blue #1E90FF ΔE 0.057
- Bright Blue #0165FC ΔE 0.061
- Neon Blue #4361EE ΔE 0.062
- Dark Sky Blue #448EE4 ΔE 0.062
- Cornflower #6A79F7 ΔE 0.065
Use #237BEF 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.