#257EE3
Closest named color: Clear Blue (#247AFD). oklch(59.6% 0.174 255), rgb(37, 126, 227).
Aa
Black text reads best on this color (5.17:1).
About this color
#257EE3 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.174 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 5.17:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.174) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.17:1 |
| White text | 4.06:1 |
Values
| HEX | #257EE3 |
| RGB | rgb(37, 126, 227) |
| HSL | hsl(212, 77%, 52%) |
| OKLCH | oklch(59.6% 0.174 255) |
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 #257EE3 | 4.06:1 | AA large text | Lc -72.8 | Content text, not long reading |
| Black text on #257EE3 | 5.17:1 | AA | Lc 36.8 | Non-text elements, placeholder text |
| #257EE3 text on white | 4.06:1 | AA large text | Lc 67.3 | Content text, not long reading |
| #257EE3 text on black | 5.17:1 | AA | Lc -34.4 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBF9
oklch(88.5% 0.048 256.2)
-
Step 300
300
#9CC4F7
oklch(81% 0.084 254.7)
-
Step 400
400
#63A3F3
oklch(70.7% 0.135 254.8)
-
Step 500
500 (this color)
#257EE3
oklch(59.6% 0.174 255)
-
Step 600
600
#0071DA
oklch(55.6% 0.182 254.8)
-
Step 700
700
#005EB9
oklch(49% 0.162 255.1)
-
Step 800
800
#004D99
oklch(42.7% 0.14 255)
-
Step 900
900
#0C417C
oklch(37.8% 0.113 255)
-
Step 950
950
#0A2648
oklch(26.9% 0.072 255.3)
#257EE3 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) | #4887E7 | 0.038 |
| Deuteranopia (no green cones) | #1B76E1 | 0.023 |
| Tritanopia (no blue cones) | #0096A5 | 0.130 |
| Achromatopsia (no color) | #7E7E7E | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257EE3
#257EE3
oklch(59.6% 0.174 255)
- #AA7200
#AA7200
oklch(59.6% 0.126 74.9)
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 #257EE3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.042
- Water Blue #0E87CC ΔE 0.047
- Cerulean Blue #056EEE ΔE 0.049
- Dark Sky Blue #448EE4 ΔE 0.051
- Royal Blue #4169E1 ΔE 0.053
- Windows Blue #3778BF ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.059
- Soft Blue #6488EA ΔE 0.064
Use #257EE3 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.