#4357B9
Closest named color: Iris (#6258C4). oklch(49.5% 0.156 271), rgb(67, 87, 185).
Aa
White text reads best on this color (6.35:1).
About this color
#4357B9 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.156 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.047 away. White text reads best on it, at 6.35:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.30:1 |
| White text | 6.35:1 |
Values
| HEX | #4357B9 |
| RGB | rgb(67, 87, 185) |
| HSL | hsl(230, 47%, 49%) |
| OKLCH | oklch(49.5% 0.156 271) |
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 #4357B9 | 6.35:1 | AA | Lc -86.4 | Fine for body text |
| Black text on #4357B9 | 3.30:1 | AA large text | Lc 22.8 | Dividers and decoration only |
| #4357B9 text on white | 6.35:1 | AA | Lc 81.3 | Fine for body text |
| #4357B9 text on black | 3.30:1 | AA large text | Lc -20.6 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4E9F9
oklch(93.5% 0.022 272.1)
-
Step 200
200
#CFD8F6
oklch(88.5% 0.042 272.3)
-
Step 300
300
#AEBFF2
oklch(80.9% 0.075 270.3)
-
Step 400
400
#859CEC
oklch(70.8% 0.12 270.9)
-
Step 500
500
#6881E6
oklch(63.2% 0.154 271)
-
Step 600
600
#5168D4
oklch(55.7% 0.167 271)
-
Step 700
700 (this color)
#4357B9
oklch(49.5% 0.156 271)
-
Step 800
800
#364794
oklch(42.7% 0.128 270.8)
-
Step 900
900
#2E3C76
oklch(37.6% 0.1 270.7)
-
Step 950
950
#1B2445
oklch(27.1% 0.063 270.3)
#4357B9 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) | #1965BC | 0.045 |
| Deuteranopia (no green cones) | #005AB7 | 0.045 |
| Tritanopia (no blue cones) | #006E7F | 0.132 |
| Achromatopsia (no color) | #5F5F5F | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4357B9
#4357B9
oklch(49.5% 0.156 271)
- #785F00
#785F00
oklch(49.6% 0.101 90.8)
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 #4357B9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.047
- Warm Blue #4B57DB ΔE 0.054
- Mid Blue #276AB3 ΔE 0.055
- French Blue #436BAD ΔE 0.060
- Blue With A Hint Of Purple #533CC6 ΔE 0.065
- Slate Blue #6A5ACD ΔE 0.065
- Dark Periwinkle #665FD1 ΔE 0.066
- Denim Blue #3B5B92 ΔE 0.066
Use #4357B9 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.