#273DA6
Closest named color: Sapphire (#2138AB). oklch(41.4% 0.17 268.5), rgb(39, 61, 166).
Aa
White text reads best on this color (9.11:1).
About this color
#273DA6 is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.170 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.016 away. White text reads best on it, at 9.11:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.30:1 |
| White text | 9.11:1 |
Values
| HEX | #273DA6 |
| RGB | rgb(39, 61, 166) |
| HSL | hsl(230, 62%, 40%) |
| OKLCH | oklch(41.4% 0.17 268.5) |
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 #273DA6 | 9.11:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #273DA6 | 2.30:1 | Fails | Lc 13.6 | Not readable |
| #273DA6 text on white | 9.11:1 | AAA | Lc 90.3 | Preferred for body text |
| #273DA6 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2EAFE
oklch(93.7% 0.028 268.4)
-
Step 200
200
#CAD9FF
oklch(88.6% 0.055 268.3)
-
Step 300
300
#A7BFFF
oklch(81% 0.095 268.4)
-
Step 400
400
#799AFF
oklch(70.6% 0.153 268.6)
-
Step 500
500
#587DFF
oklch(63.1% 0.197 268.3)
-
Step 600
600
#4060F2
oklch(55.6% 0.221 268.5)
-
Step 700
700
#334ED3
oklch(49.1% 0.206 268.5)
-
Step 800
800 (this color)
#273DA6
oklch(41.4% 0.17 268.5)
-
Step 900
900
#253987
oklch(37.8% 0.133 268.4)
-
Step 950
950
#16224F
oklch(27% 0.084 268.9)
#273DA6 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) | #004EA9 | 0.043 |
| Deuteranopia (no green cones) | #0042A4 | 0.025 |
| Tritanopia (no blue cones) | #00586B | 0.134 |
| Achromatopsia (no color) | #484848 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273DA6
#273DA6
oklch(41.4% 0.17 268.5)
- #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 #273DA6, closest first.
No curated palette has a color within ΔE 0.04 of #273DA6.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.016
- Cobalt #1E488F ΔE 0.048
- Blueberry #464196 ΔE 0.052
- Blue Blue #2242C7 ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.064
- Majorelle Blue #3F37C9 ΔE 0.064
- Indigo Blue #3A18B1 ΔE 0.064
- Dusk Blue #26538D ΔE 0.074
Use #273DA6 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.