#257AE3
Closest named color: Cerulean Blue (#056EEE). oklch(58.7% 0.178 256.3), rgb(37, 122, 227).
Aa
Black text reads best on this color (4.97:1).
About this color
#257AE3 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.178 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.039 away. Black text reads best on it, at 4.97:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.178) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.97:1 |
| White text | 4.22:1 |
Values
| HEX | #257AE3 |
| RGB | rgb(37, 122, 227) |
| HSL | hsl(213, 77%, 52%) |
| OKLCH | oklch(58.7% 0.178 256.3) |
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 #257AE3 | 4.22:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #257AE3 | 4.97:1 | AA | Lc 35.5 | Non-text elements, placeholder text |
| #257AE3 text on white | 4.22:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #257AE3 text on black | 4.97:1 | AA | Lc -33.1 | 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 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
#C7DBF7
oklch(88.5% 0.044 256.8)
-
Step 300
300
#9FC3F4
oklch(80.8% 0.08 256.2)
-
Step 400
400
#6AA2EF
oklch(70.6% 0.128 256.6)
-
Step 500
500
#3F89EA
oklch(63.1% 0.164 256.4)
-
Step 600
600 (this color)
#257AE3
oklch(58.7% 0.178 256.3)
-
Step 700
700
#075DBC
oklch(49.1% 0.166 256.5)
-
Step 800
800
#0D4D98
oklch(42.8% 0.137 256.2)
-
Step 900
900
#154179
oklch(37.8% 0.107 256.3)
-
Step 950
950
#0E2647
oklch(27% 0.068 257.1)
#257AE3 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) | #3F84E7 | 0.035 |
| Deuteranopia (no green cones) | #0073E1 | 0.024 |
| Tritanopia (no blue cones) | #0093A3 | 0.135 |
| Achromatopsia (no color) | #7B7B7B | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257AE3
#257AE3
oklch(58.7% 0.178 256.3)
- #A57100
#A57100
oklch(58.8% 0.123 76.8)
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 #257AE3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.039
- Clear Blue #247AFD ΔE 0.039
- Royal Blue #4169E1 ΔE 0.043
- Water Blue #0E87CC ΔE 0.054
- Windows Blue #3778BF ΔE 0.055
- Dark Sky Blue #448EE4 ΔE 0.061
- Neon Blue #4361EE ΔE 0.064
- Dodger Blue #1E90FF ΔE 0.067
Use #257AE3 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.