#4F91FB
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.5% 0.172 259.5), rgb(79, 145, 251).
Aa
Black text reads best on this color (6.77:1).
About this color
#4F91FB is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.172 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.023 away. Black text reads best on it, at 6.77:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.172) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.77:1 |
| White text | 3.09:1 |
Values
| HEX | #4F91FB |
| RGB | rgb(79, 145, 251) |
| HSL | hsl(217, 96%, 65%) |
| OKLCH | oklch(66.5% 0.172 259.5) |
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 #4F91FB | 3.09:1 | AA large text | Lc -63.0 | Content text, not long reading |
| Black text on #4F91FB | 6.77:1 | AA | Lc 46.4 | Large or bold text, headings |
| #4F91FB text on white | 3.09:1 | AA large text | Lc 57.6 | Large or bold text, headings |
| #4F91FB text on black | 6.77:1 | AA | Lc -44.1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAF9
oklch(88.4% 0.048 260.2)
-
Step 300
300
#A1C2F7
oklch(80.9% 0.084 259.8)
-
Step 400
400
#6DA1F4
oklch(70.8% 0.134 259.4)
-
Step 500
500 (this color)
#4F91FB
oklch(66.5% 0.172 259.5)
-
Step 600
600
#256DDE
oklch(55.6% 0.187 259.6)
-
Step 700
700
#175AC1
oklch(49.1% 0.174 259.6)
-
Step 800
800
#164A9C
oklch(42.6% 0.145 259.6)
-
Step 900
900
#193F7C
oklch(37.7% 0.112 259.6)
-
Step 950
950
#102548
oklch(26.9% 0.071 260)
#4F91FB 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) | #5E9BFF | 0.032 |
| Deuteranopia (no green cones) | #418BF9 | 0.021 |
| Tritanopia (no blue cones) | #00AABA | 0.138 |
| Achromatopsia (no color) | #929292 | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4F91FB
#4F91FB
oklch(66.5% 0.172 259.5)
- #C08800
#C08800
oklch(66.5% 0.138 79.4)
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 #4F91FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.023
- Dodger Blue #1E90FF ΔE 0.030
- Cornflower Blue #6495ED ΔE 0.032
- Soft Blue #6488EA ΔE 0.034
- Dark Sky Blue #448EE4 ΔE 0.037
- Cornflower #6A79F7 ΔE 0.061
- Lavender Blue #8B88F8 ΔE 0.069
- Clear Blue #247AFD ΔE 0.071
Use #4F91FB 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.