#237BE5
Closest named color: Clear Blue (#247AFD). oklch(59% 0.18 256.1), rgb(35, 123, 229).
Aa
Black text reads best on this color (5.03:1).
About this color
#237BE5 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.180 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.037 away. Black text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.180) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.03:1 |
| White text | 4.16:1 |
Values
| HEX | #237BE5 |
| RGB | rgb(35, 123, 229) |
| HSL | hsl(213, 79%, 52%) |
| OKLCH | oklch(59% 0.18 256.1) |
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 #237BE5 | 4.16:1 | AA large text | Lc -73.7 | Content text, not long reading |
| Black text on #237BE5 | 5.03:1 | AA | Lc 35.9 | Non-text elements, placeholder text |
| #237BE5 text on white | 4.16:1 | AA large text | Lc 68.2 | Content text, not long reading |
| #237BE5 text on black | 5.03:1 | AA | Lc -33.5 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9FC3F5
oklch(80.9% 0.081 256.7)
-
Step 400
400
#68A2F0
oklch(70.6% 0.13 256.2)
-
Step 500
500
#3D89EB
oklch(63.1% 0.166 256.1)
-
Step 600
600 (this color)
#237BE5
oklch(59% 0.18 256.1)
-
Step 700
700
#015DBC
oklch(49% 0.167 256.1)
-
Step 800
800
#0A4D98
oklch(42.7% 0.138 255.9)
-
Step 900
900
#134179
oklch(37.7% 0.107 255.7)
-
Step 950
950
#0D2647
oklch(26.9% 0.069 256.4)
#237BE5 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) | #4085E9 | 0.036 |
| Deuteranopia (no green cones) | #0074E3 | 0.023 |
| Tritanopia (no blue cones) | #0095A5 | 0.136 |
| Achromatopsia (no color) | #7C7C7C | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #237BE5
#237BE5
oklch(59% 0.18 256.1)
- #A77100
#A77100
oklch(59% 0.124 75.7)
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 #237BE5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.037
- Cerulean Blue #056EEE ΔE 0.040
- Royal Blue #4169E1 ΔE 0.046
- Water Blue #0E87CC ΔE 0.055
- Windows Blue #3778BF ΔE 0.058
- Dark Sky Blue #448EE4 ΔE 0.059
- Dodger Blue #1E90FF ΔE 0.063
- Neon Blue #4361EE ΔE 0.066
Use #237BE5 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.