#4F57CF
Closest named color: Warm Blue (#4B57DB). oklch(52% 0.183 275.2), rgb(79, 87, 207).
Aa
White text reads best on this color (5.83:1).
About this color
#4F57CF is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.183 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.019 away. White text reads best on it, at 5.83:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.59:1 |
| White text | 5.83:1 |
Values
| HEX | #4F57CF |
| RGB | rgb(79, 87, 207) |
| HSL | hsl(236, 57%, 56%) |
| OKLCH | oklch(52% 0.183 275.2) |
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 #4F57CF | 5.83:1 | AA | Lc -84.0 | Fine for body text |
| Black text on #4F57CF | 3.59:1 | AA large text | Lc 25.3 | Dividers and decoration only |
| #4F57CF text on white | 5.83:1 | AA | Lc 78.8 | Fine for body text |
| #4F57CF text on black | 3.59:1 | AA large text | Lc -23.0 | Dividers and decoration only |
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 700.
-
Step 50
50
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#CFD7FA
oklch(88.4% 0.049 275.2)
-
Step 300
300
#B0BDFA
oklch(81% 0.088 275)
-
Step 400
400
#8898F8
oklch(70.8% 0.141 275)
-
Step 500
500
#6D7AF4
oklch(63% 0.181 275.4)
-
Step 600
600
#5760E3
oklch(55.6% 0.196 275.1)
-
Step 700
700 (this color)
#4F57CF
oklch(52% 0.183 275.2)
-
Step 800
800
#3B419F
oklch(42.7% 0.15 275.3)
-
Step 900
900
#32387F
oklch(37.7% 0.118 275.5)
-
Step 950
950
#1D224A
oklch(27.1% 0.074 275)
#4F57CF 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) | #006BD3 | 0.065 |
| Deuteranopia (no green cones) | #005FCD | 0.057 |
| Tritanopia (no blue cones) | #00748A | 0.155 |
| Achromatopsia (no color) | #656565 | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4F57CF
#4F57CF
oklch(52% 0.183 275.2)
- #7C6700
#7C6700
oklch(51.9% 0.107 94.9)
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 #4F57CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.019
- Iris #6258C4 ΔE 0.033
- Dark Periwinkle #665FD1 ΔE 0.040
- Slate Blue #6A5ACD ΔE 0.041
- Light Indigo #6D5ACF ΔE 0.046
- Royal Blue #4169E1 ΔE 0.050
- Neon Blue #4361EE ΔE 0.053
- Bluey Purple #6241C7 ΔE 0.053
Use #4F57CF 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.