#4291FF
Closest named color: Dodger Blue (#1E90FF). oklch(66.3% 0.181 257.4), rgb(66, 145, 255).
Aa
Black text reads best on this color (6.72:1).
About this color
#4291FF is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.181 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dodger Blue (#1E90FF), ΔE 0.020 away. Black text reads best on it, at 6.72:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.181) |
| Temperature | cool |
| Nearest name | Dodger Blue (#1E90FF) |
| Black text | 6.72:1 |
| White text | 3.12:1 |
Values
| HEX | #4291FF |
| RGB | rgb(66, 145, 255) |
| HSL | hsl(215, 100%, 63%) |
| OKLCH | oklch(66.3% 0.181 257.4) |
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 #4291FF | 3.12:1 | AA large text | Lc -63.2 | Content text, not long reading |
| Black text on #4291FF | 6.72:1 | AA | Lc 46.2 | Large or bold text, headings |
| #4291FF text on white | 3.12:1 | AA large text | Lc 57.8 | Large or bold text, headings |
| #4291FF text on black | 6.72:1 | AA | Lc -43.9 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBFA
oklch(88.5% 0.049 256.9)
-
Step 300
300
#9DC3FA
oklch(81% 0.088 257.6)
-
Step 400
400
#65A1F7
oklch(70.6% 0.141 257.5)
-
Step 500
500 (this color)
#4291FF
oklch(66.3% 0.181 257.4)
-
Step 600
600
#086DE3
oklch(55.5% 0.197 257.5)
-
Step 700
700
#005BC2
oklch(49% 0.177 257.5)
-
Step 800
800
#034B9F
oklch(42.7% 0.151 257.2)
-
Step 900
900
#103F7E
oklch(37.6% 0.118 257.5)
-
Step 950
950
#0C264A
oklch(27.1% 0.074 257.4)
#4291FF 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) | #5A9BFF | 0.036 |
| Deuteranopia (no green cones) | #358AFD | 0.022 |
| Tritanopia (no blue cones) | #00ABBC | 0.140 |
| Achromatopsia (no color) | #929292 | 0.181 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4291FF
#4291FF
oklch(66.3% 0.181 257.4)
- #C18600
#C18600
oklch(66.2% 0.138 77.6)
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 #4291FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dodger Blue #1E90FF ΔE 0.020
- Chefchaouen Blue #4895EF ΔE 0.028
- Dark Sky Blue #448EE4 ΔE 0.040
- Cornflower Blue #6495ED ΔE 0.043
- Soft Blue #6488EA ΔE 0.043
- Cornflower #6A79F7 ΔE 0.065
- Clear Blue #247AFD ΔE 0.065
- Lavender Blue #8B88F8 ΔE 0.078
Use #4291FF 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.