#257EEC
Closest named color: Clear Blue (#247AFD). oklch(60.2% 0.185 256.4), rgb(37, 126, 236).
Aa
Black text reads best on this color (5.27:1).
About this color
#257EEC is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.185 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.028 away. Black text reads best on it, at 5.27:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.185) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.27:1 |
| White text | 3.98:1 |
Values
| HEX | #257EEC |
| RGB | rgb(37, 126, 236) |
| HSL | hsl(213, 84%, 54%) |
| OKLCH | oklch(60.2% 0.185 256.4) |
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 #257EEC | 3.98:1 | AA large text | Lc -72.1 | Content text, not long reading |
| Black text on #257EEC | 5.27:1 | AA | Lc 37.5 | Non-text elements, placeholder text |
| #257EEC text on white | 3.98:1 | AA large text | Lc 66.6 | Content text, not long reading |
| #257EEC text on black | 5.27:1 | AA | Lc -35.1 | 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
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C4DBFB
oklch(88.5% 0.051 256.7)
-
Step 300
300
#9BC3FB
oklch(80.9% 0.091 256.9)
-
Step 400
400
#61A2F9
oklch(70.7% 0.145 256.2)
-
Step 500
500 (this color)
#257EEC
oklch(60.2% 0.185 256.4)
-
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
#004C9D
oklch(42.8% 0.147 256.2)
-
Step 900
900
#0A4080
oklch(37.8% 0.121 256.3)
-
Step 950
950
#09264B
oklch(27.1% 0.077 256.3)
#257EEC 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) | #4089F0 | 0.037 |
| Deuteranopia (no green cones) | #0077EA | 0.024 |
| Tritanopia (no blue cones) | #0099A9 | 0.142 |
| Achromatopsia (no color) | #7F7F7F | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257EEC
#257EEC
oklch(60.2% 0.185 256.4)
- #AB7500
#AB7500
oklch(60.3% 0.126 76.6)
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 #257EEC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.028
- Cerulean Blue #056EEE ΔE 0.045
- Dodger Blue #1E90FF ΔE 0.051
- Royal Blue #4169E1 ΔE 0.053
- Dark Sky Blue #448EE4 ΔE 0.053
- Water Blue #0E87CC ΔE 0.059
- Soft Blue #6488EA ΔE 0.063
- Cornflower #6A79F7 ΔE 0.064
Use #257EEC 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.