#257CE2
Closest named color: Clear Blue (#247AFD). oklch(59.1% 0.175 255.5), rgb(37, 124, 226).
Aa
Black text reads best on this color (5.05:1).
About this color
#257CE2 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.175 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.042 away. Black text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.175) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.05:1 |
| White text | 4.15:1 |
Values
| HEX | #257CE2 |
| RGB | rgb(37, 124, 226) |
| HSL | hsl(212, 77%, 52%) |
| OKLCH | oklch(59.1% 0.175 255.5) |
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 #257CE2 | 4.15:1 | AA large text | Lc -73.5 | Content text, not long reading |
| Black text on #257CE2 | 5.05:1 | AA | Lc 36.1 | Non-text elements, placeholder text |
| #257CE2 text on white | 4.15:1 | AA large text | Lc 68.0 | Content text, not long reading |
| #257CE2 text on black | 5.05:1 | AA | Lc -33.6 | 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
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF6
oklch(88.5% 0.043 255.9)
-
Step 300
300
#9FC3F3
oklch(80.8% 0.079 255.7)
-
Step 400
400
#69A3EE
oklch(70.7% 0.126 255.4)
-
Step 500
500
#3E8AE8
oklch(63.2% 0.16 255.4)
-
Step 600
600 (this color)
#257CE2
oklch(59.1% 0.175 255.5)
-
Step 700
700
#045EBA
oklch(49.1% 0.163 255.6)
-
Step 800
800
#0B4D96
oklch(42.6% 0.135 255.5)
-
Step 900
900
#144178
oklch(37.7% 0.106 255.7)
-
Step 950
950
#0E2746
oklch(27.1% 0.066 255.2)
#257CE2 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) | #4585E6 | 0.036 |
| Deuteranopia (no green cones) | #1475E0 | 0.021 |
| Tritanopia (no blue cones) | #0095A4 | 0.132 |
| Achromatopsia (no color) | #7C7C7C | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257CE2
#257CE2
oklch(59.1% 0.175 255.5)
- #A87100
#A87100
oklch(59.1% 0.125 75.2)
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 #257CE2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.042
- Cerulean Blue #056EEE ΔE 0.045
- Royal Blue #4169E1 ΔE 0.048
- Water Blue #0E87CC ΔE 0.049
- Windows Blue #3778BF ΔE 0.053
- Dark Sky Blue #448EE4 ΔE 0.056
- Dodger Blue #1E90FF ΔE 0.064
- Soft Blue #6488EA ΔE 0.068
Use #257CE2 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.