#2357AB
Closest named color: Dusk Blue (#26538D). oklch(47% 0.146 259.7), rgb(35, 87, 171).
Aa
White text reads best on this color (6.94:1).
About this color
#2357AB is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.146 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.049 away. White text reads best on it, at 6.94:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 3.02:1 |
| White text | 6.94:1 |
Values
| HEX | #2357AB |
| RGB | rgb(35, 87, 171) |
| HSL | hsl(217, 66%, 40%) |
| OKLCH | oklch(47% 0.146 259.7) |
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 #2357AB | 6.94:1 | AA | Lc -88.6 | Fine for body text |
| Black text on #2357AB | 3.02:1 | AA large text | Lc 20.4 | Dividers and decoration only |
| #2357AB text on white | 6.94:1 | AA | Lc 83.6 | Fine for body text |
| #2357AB text on black | 3.02:1 | AA large text | Lc -18.4 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CADAF4
oklch(88.4% 0.04 260.1)
-
Step 300
300
#A6C2EF
oklch(80.9% 0.071 259.8)
-
Step 400
400
#76A1E7
oklch(70.7% 0.113 259.8)
-
Step 500
500
#5288E0
oklch(63.1% 0.145 259.7)
-
Step 600
600
#3770CD
oklch(55.6% 0.156 259.7)
-
Step 700
700 (this color)
#2357AB
oklch(47% 0.146 259.7)
-
Step 800
800
#234D90
oklch(42.8% 0.12 259.4)
-
Step 900
900
#214073
oklch(37.6% 0.095 259.8)
-
Step 950
950
#142643
oklch(27% 0.059 259.5)
#2357AB 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) | #2660AE | 0.025 |
| Deuteranopia (no green cones) | #0054A9 | 0.020 |
| Tritanopia (no blue cones) | #006B79 | 0.112 |
| Achromatopsia (no color) | #5A5A5A | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2357AB
#2357AB
oklch(47% 0.146 259.7)
- #775300
#775300
oklch(46.9% 0.097 79.6)
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 #2357AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.049
- Denim Blue #3B5B92 ΔE 0.049
- Mid Blue #276AB3 ΔE 0.054
- Cobalt #1E488F ΔE 0.059
- Light Navy Blue #2E5A88 ΔE 0.060
- Dusky Blue #475F94 ΔE 0.060
- Peacock Blue #016795 ΔE 0.063
- Light Navy #155084 ΔE 0.067
Use #2357AB 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.