#3B5BBB
Closest named color: Mid Blue (#276AB3). oklch(50.1% 0.156 266.8), rgb(59, 91, 187).
Aa
White text reads best on this color (6.17:1).
About this color
#3B5BBB is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.156 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.045 away. White text reads best on it, at 6.17:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.39:1 |
| White text | 6.17:1 |
Values
| HEX | #3B5BBB |
| RGB | rgb(59, 91, 187) |
| HSL | hsl(225, 52%, 48%) |
| OKLCH | oklch(50.1% 0.156 266.8) |
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 #3B5BBB | 6.17:1 | AA | Lc -85.6 | Fine for body text |
| Black text on #3B5BBB | 3.39:1 | AA large text | Lc 23.6 | Dividers and decoration only |
| #3B5BBB text on white | 6.17:1 | AA | Lc 80.5 | Fine for body text |
| #3B5BBB text on black | 3.39:1 | AA large text | Lc -21.4 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F6
oklch(88.5% 0.042 267.7)
-
Step 300
300
#ABC0F2
oklch(80.9% 0.075 267)
-
Step 400
400
#7E9EEC
oklch(70.8% 0.12 266.4)
-
Step 500
500
#5F83E6
oklch(63.1% 0.154 266.9)
-
Step 600
600
#476AD4
oklch(55.5% 0.168 267.1)
-
Step 700
700 (this color)
#3B5BBB
oklch(50.1% 0.156 266.8)
-
Step 800
800
#2F4995
oklch(42.8% 0.129 266.7)
-
Step 900
900
#293D76
oklch(37.5% 0.101 267)
-
Step 950
950
#182445
oklch(26.9% 0.064 267)
#3B5BBB 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) | #2167BE | 0.034 |
| Deuteranopia (no green cones) | #005CB9 | 0.035 |
| Tritanopia (no blue cones) | #007282 | 0.128 |
| Achromatopsia (no color) | #616161 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B5BBB
#3B5BBB
oklch(50.1% 0.156 266.8)
- #7D5F00
#7D5F00
oklch(50.2% 0.103 87)
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 #3B5BBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.045
- Iris #6258C4 ΔE 0.054
- French Blue #436BAD ΔE 0.054
- Warm Blue #4B57DB ΔE 0.055
- Denim Blue #3B5B92 ΔE 0.066
- Dusky Blue #475F94 ΔE 0.066
- Royal Blue #4169E1 ΔE 0.068
- Dark Periwinkle #665FD1 ΔE 0.069
Use #3B5BBB 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.