#223F9F
Closest named color: Sapphire (#2138AB). oklch(40.9% 0.16 266.4), rgb(34, 63, 159).
Aa
White text reads best on this color (9.21:1).
About this color
#223F9F is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.160 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.025 away. White text reads best on it, at 9.21:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.27:1 |
| White text | 9.21:1 |
Values
| HEX | #223F9F |
| RGB | rgb(34, 63, 159) |
| HSL | hsl(226, 65%, 38%) |
| OKLCH | oklch(40.9% 0.16 266.4) |
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 #223F9F | 9.21:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #223F9F | 2.27:1 | Fails | Lc 13.3 | Not readable |
| #223F9F text on white | 9.21:1 | AAA | Lc 90.7 | Preferred for body text |
| #223F9F text on black | 2.27:1 | Fails | Lc -11.7 | 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
#F1F5FE
oklch(97% 0.013 266.7)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C9D9FC
oklch(88.5% 0.051 265.9)
-
Step 300
300
#A5C0FE
oklch(81% 0.093 266.2)
-
Step 400
400
#759CFD
oklch(70.7% 0.149 266.1)
-
Step 500
500
#547FFB
oklch(63% 0.191 266.5)
-
Step 600
600
#3B65EA
oklch(55.6% 0.206 266.3)
-
Step 700
700
#2E52CC
oklch(49% 0.193 266.5)
-
Step 800
800 (this color)
#223F9F
oklch(40.9% 0.16 266.4)
-
Step 900
900
#233B83
oklch(37.8% 0.125 266.5)
-
Step 950
950
#14234C
oklch(26.9% 0.078 266.1)
#223F9F 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) | #004EA2 | 0.039 |
| Deuteranopia (no green cones) | #00429D | 0.020 |
| Tritanopia (no blue cones) | #005768 | 0.125 |
| Achromatopsia (no color) | #484848 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #223F9F
#223F9F
oklch(40.9% 0.16 266.4)
- #5E4600
#5E4600
oklch(40.9% 0.084 86.2)
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 #223F9F, closest first.
No curated palette has a color within ΔE 0.04 of #223F9F.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.025
- Cobalt #1E488F ΔE 0.036
- Blueberry #464196 ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.060
- Blue Blue #2242C7 ΔE 0.065
- Dusk Blue #26538D ΔE 0.065
- Twilight Blue #0A437A ΔE 0.066
- Light Navy #155084 ΔE 0.068
Use #223F9F 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.