#273FA0
Closest named color: Sapphire (#2138AB). oklch(41.3% 0.16 267.9), rgb(39, 63, 160).
Aa
White text reads best on this color (9.11:1).
About this color
#273FA0 is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.160 and its hue 268°. 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 9.11:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.30:1 |
| White text | 9.11:1 |
Values
| HEX | #273FA0 |
| RGB | rgb(39, 63, 160) |
| HSL | hsl(228, 61%, 39%) |
| OKLCH | oklch(41.3% 0.16 267.9) |
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 #273FA0 | 9.11:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #273FA0 | 2.30:1 | Fails | Lc 13.5 | Not readable |
| #273FA0 text on white | 9.11:1 | AAA | Lc 90.4 | Preferred for body text |
| #273FA0 text on black | 2.30:1 | Fails | Lc -11.9 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFD
oklch(93.7% 0.027 267.5)
-
Step 200
200
#CAD9FC
oklch(88.5% 0.051 267)
-
Step 300
300
#A7BFFE
oklch(81% 0.093 268.2)
-
Step 400
400
#799BFD
oklch(70.7% 0.149 268)
-
Step 500
500
#587EFB
oklch(63% 0.191 267.9)
-
Step 600
600
#4163EA
oklch(55.5% 0.207 268.1)
-
Step 700
700
#3351CC
oklch(49.1% 0.193 267.9)
-
Step 800
800 (this color)
#273FA0
oklch(41.3% 0.16 267.9)
-
Step 900
900
#263A83
oklch(37.7% 0.125 268.3)
-
Step 950
950
#16234C
oklch(27% 0.078 267.7)
#273FA0 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) | #004EA3 | 0.040 |
| Deuteranopia (no green cones) | #00439E | 0.025 |
| Tritanopia (no blue cones) | #005869 | 0.127 |
| Achromatopsia (no color) | #484848 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273FA0
#273FA0
oklch(41.3% 0.16 267.9)
- #5E4800
#5E4800
oklch(41.3% 0.084 88.6)
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 #273FA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.025
- Cobalt #1E488F ΔE 0.038
- Blueberry #464196 ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.056
- Blue Blue #2242C7 ΔE 0.063
- Dusk Blue #26538D ΔE 0.065
- Light Navy #155084 ΔE 0.069
- Twilight Blue #0A437A ΔE 0.069
Use #273FA0 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.