#3B91EE
Closest named color: Chefchaouen Blue (#4895EF). oklch(65% 0.161 253.1), rgb(59, 145, 238).
Aa
Black text reads best on this color (6.47:1).
About this color
#3B91EE is a medium-light, vivid blue. In OKLCH its lightness is 65%, its chroma 0.161 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.016 away. Black text reads best on it, at 6.47:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.161) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.47:1 |
| White text | 3.24:1 |
Values
| HEX | #3B91EE |
| RGB | rgb(59, 145, 238) |
| HSL | hsl(211, 84%, 58%) |
| OKLCH | oklch(65% 0.161 253.1) |
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 #3B91EE | 3.24:1 | AA large text | Lc -64.8 | Content text, not long reading |
| Black text on #3B91EE | 6.47:1 | AA | Lc 44.7 | Non-text elements, placeholder text |
| #3B91EE text on white | 3.24:1 | AA large text | Lc 59.3 | Large or bold text, headings |
| #3B91EE text on black | 6.47:1 | AA | Lc -42.4 | 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
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C5DCF6
oklch(88.6% 0.044 251.5)
-
Step 300
300
#9DC4F3
oklch(80.9% 0.079 253.4)
-
Step 400
400
#65A4ED
oklch(70.7% 0.126 253.2)
-
Step 500
500 (this color)
#3B91EE
oklch(65% 0.161 253.1)
-
Step 600
600
#0073D4
oklch(55.6% 0.172 253.1)
-
Step 700
700
#0060B3
oklch(49% 0.152 253.2)
-
Step 800
800
#004F94
oklch(42.8% 0.131 252.8)
-
Step 900
900
#0D4277
oklch(37.7% 0.105 252.9)
-
Step 950
950
#0B2746
oklch(27% 0.067 253.4)
#3B91EE 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) | #6598F2 | 0.044 |
| Deuteranopia (no green cones) | #4887EC | 0.026 |
| Tritanopia (no blue cones) | #00A7B4 | 0.122 |
| Achromatopsia (no color) | #8F8F8F | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B91EE
#3B91EE
oklch(65% 0.161 253.1)
- #C17F00
#C17F00
oklch(64.9% 0.138 72.9)
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 #3B91EE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.016
- Dark Sky Blue #448EE4 ΔE 0.016
- Dodger Blue #1E90FF ΔE 0.029
- Cornflower Blue #6495ED ΔE 0.039
- Soft Blue #6488EA ΔE 0.039
- Water Blue #0E87CC ΔE 0.062
- Clear Blue #247AFD ΔE 0.070
- Cornflower #6A79F7 ΔE 0.073
Use #3B91EE 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.