#233FA5
Closest named color: Sapphire (#2138AB). oklch(41.5% 0.167 266.8), rgb(35, 63, 165).
Aa
White text reads best on this color (9.02:1).
About this color
#233FA5 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.167 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.019 away. White text reads best on it, at 9.02:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.32:1 |
| White text | 9.02:1 |
Values
| HEX | #233FA5 |
| RGB | rgb(35, 63, 165) |
| HSL | hsl(227, 65%, 39%) |
| OKLCH | oklch(41.5% 0.167 266.8) |
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 #233FA5 | 9.02:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #233FA5 | 2.32:1 | Fails | Lc 13.8 | Not readable |
| #233FA5 text on white | 9.02:1 | AAA | Lc 90.1 | Preferred for body text |
| #233FA5 text on black | 2.32:1 | Fails | Lc -12.1 | Not readable |
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 800.
-
Step 50
50
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFE
oklch(93.6% 0.029 266.4)
-
Step 200
200
#C9D9FE
oklch(88.5% 0.054 266.8)
-
Step 300
300
#A5BFFF
oklch(80.9% 0.095 267.2)
-
Step 400
400
#759BFF
oklch(70.6% 0.153 266.8)
-
Step 500
500
#537EFF
oklch(63.1% 0.197 266.8)
-
Step 600
600
#3A62F0
oklch(55.5% 0.218 266.9)
-
Step 700
700
#2D50D1
oklch(49.1% 0.202 266.7)
-
Step 800
800 (this color)
#233FA5
oklch(41.5% 0.167 266.8)
-
Step 900
900
#223A86
oklch(37.8% 0.131 266.7)
-
Step 950
950
#14234E
oklch(27.1% 0.082 266.5)
#233FA5 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) | #004FA8 | 0.040 |
| Deuteranopia (no green cones) | #0043A3 | 0.021 |
| Tritanopia (no blue cones) | #00596C | 0.130 |
| Achromatopsia (no color) | #494949 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233FA5
#233FA5
oklch(41.5% 0.167 266.8)
- #604800
#604800
oklch(41.6% 0.085 86.7)
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 #233FA5, closest first.
No curated palette has a color within ΔE 0.04 of #233FA5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.019
- Cobalt #1E488F ΔE 0.044
- Blueberry #464196 ΔE 0.052
- Blue Blue #2242C7 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.064
- Majorelle Blue #3F37C9 ΔE 0.067
- Indigo Blue #3A18B1 ΔE 0.069
- Dusk Blue #26538D ΔE 0.070
Use #233FA5 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.