#5991FB
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.9% 0.168 261.9), rgb(89, 145, 251).
Aa
Black text reads best on this color (6.86:1).
About this color
#5991FB is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.168 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.027 away. Black text reads best on it, at 6.86:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.86:1 |
| White text | 3.05:1 |
Values
| HEX | #5991FB |
| RGB | rgb(89, 145, 251) |
| HSL | hsl(219, 95%, 67%) |
| OKLCH | oklch(66.9% 0.168 261.9) |
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 #5991FB | 3.05:1 | AA large text | Lc -62.5 | Content text, not long reading |
| Black text on #5991FB | 6.86:1 | AA | Lc 46.9 | Large or bold text, headings |
| #5991FB text on white | 3.05:1 | AA large text | Lc 57.1 | Large or bold text, headings |
| #5991FB text on black | 6.86:1 | AA | Lc -44.6 | 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 400.
-
Step 50
50
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEAFF
oklch(93.5% 0.031 263.5)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9FC1FF
oklch(80.9% 0.096 262.2)
-
Step 400
400 (this color)
#5991FB
oklch(66.9% 0.168 261.9)
-
Step 500
500
#4182FF
oklch(63.1% 0.198 261.8)
-
Step 600
600
#1664F9
oklch(55.7% 0.234 261.9)
-
Step 700
700
#0751D9
oklch(49.1% 0.218 261.9)
-
Step 800
800
#0C44AF
oklch(42.8% 0.179 261.9)
-
Step 900
900
#123B8A
oklch(37.7% 0.14 261.8)
-
Step 950
950
#0C2351
oklch(26.9% 0.089 262.2)
#5991FB 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) | #5F9BFF | 0.028 |
| Deuteranopia (no green cones) | #468CF9 | 0.023 |
| Tritanopia (no blue cones) | #00A9BA | 0.138 |
| Achromatopsia (no color) | #939393 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5991FB
#5991FB
oklch(66.9% 0.168 261.9)
- #BF8B00
#BF8B00
oklch(67% 0.138 81.9)
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 #5991FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.027
- Cornflower Blue #6495ED ΔE 0.028
- Soft Blue #6488EA ΔE 0.031
- Dodger Blue #1E90FF ΔE 0.039
- Dark Sky Blue #448EE4 ΔE 0.041
- Cornflower #6A79F7 ΔE 0.059
- Lavender Blue #8B88F8 ΔE 0.060
- Perrywinkle #8F8CE7 ΔE 0.068
Use #5991FB 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.