#257CE8
Closest named color: Clear Blue (#247AFD). oklch(59.5% 0.182 256.5), rgb(37, 124, 232).
Aa
Black text reads best on this color (5.12:1).
About this color
#257CE8 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.182 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.033 away. Black text reads best on it, at 5.12:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.182) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.12:1 |
| White text | 4.09:1 |
Values
| HEX | #257CE8 |
| RGB | rgb(37, 124, 232) |
| HSL | hsl(213, 81%, 53%) |
| OKLCH | oklch(59.5% 0.182 256.5) |
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 #257CE8 | 4.09:1 | AA large text | Lc -73.1 | Content text, not long reading |
| Black text on #257CE8 | 5.12:1 | AA | Lc 36.5 | Non-text elements, placeholder text |
| #257CE8 text on white | 4.09:1 | AA large text | Lc 67.6 | Content text, not long reading |
| #257CE8 text on black | 5.12:1 | AA | Lc -34.1 | 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
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBFA
oklch(88.5% 0.049 256.9)
-
Step 300
300
#9BC3FA
oklch(80.8% 0.089 256.5)
-
Step 400
400
#63A2F8
oklch(70.8% 0.143 256.6)
-
Step 500
500 (this color)
#257CE8
oklch(59.5% 0.182 256.5)
-
Step 600
600
#006FE1
oklch(55.7% 0.193 256.4)
-
Step 700
700
#005DBE
oklch(49.2% 0.17 256.3)
-
Step 800
800
#004C9E
oklch(42.8% 0.148 256.4)
-
Step 900
900
#0C407F
oklch(37.8% 0.119 256.4)
-
Step 950
950
#0A264A
oklch(27% 0.075 256.3)
#257CE8 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) | #3F87EC | 0.036 |
| Deuteranopia (no green cones) | #0075E6 | 0.024 |
| Tritanopia (no blue cones) | #0096A7 | 0.137 |
| Achromatopsia (no color) | #7D7D7D | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257CE8
#257CE8
oklch(59.5% 0.182 256.5)
- #A87300
#A87300
oklch(59.5% 0.125 76.7)
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 #257CE8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.033
- Cerulean Blue #056EEE ΔE 0.041
- Royal Blue #4169E1 ΔE 0.048
- Water Blue #0E87CC ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.059
- Windows Blue #3778BF ΔE 0.062
- Neon Blue #4361EE ΔE 0.066
Use #257CE8 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.