#2151AA
Closest named color: Dusk Blue (#26538D). oklch(45.6% 0.152 261.4), rgb(33, 81, 170).
Aa
White text reads best on this color (7.44:1).
About this color
#2151AA is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.152 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.048 away. White text reads best on it, at 7.44:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.82:1 |
| White text | 7.44:1 |
Values
| HEX | #2151AA |
| RGB | rgb(33, 81, 170) |
| HSL | hsl(219, 67%, 40%) |
| OKLCH | oklch(45.6% 0.152 261.4) |
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 #2151AA | 7.44:1 | AAA | Lc -90.2 | Preferred for body text |
| Black text on #2151AA | 2.82:1 | Fails | Lc 18.7 | Dividers and decoration only |
| #2151AA text on white | 7.44:1 | AAA | Lc 85.4 | Fine for body text |
| #2151AA text on black | 2.82:1 | Fails | Lc -16.7 | 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 800.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFC
oklch(93.5% 0.027 262.3)
-
Step 200
200
#C7DAFB
oklch(88.5% 0.05 261.5)
-
Step 300
300
#A1C1FB
oklch(80.8% 0.09 262.1)
-
Step 400
400
#6D9FF9
oklch(70.7% 0.143 261.4)
-
Step 500
500
#4684F6
oklch(63.1% 0.183 261.3)
-
Step 600
600
#286AE5
oklch(55.6% 0.199 261.4)
-
Step 700
700
#1B58C7
oklch(49.2% 0.184 261.3)
-
Step 800
800 (this color)
#2151AA
oklch(45.6% 0.152 261.4)
-
Step 900
900
#1A3E7F
oklch(37.7% 0.118 261.1)
-
Step 950
950
#10254B
oklch(27.1% 0.076 261.2)
#2151AA 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) | #135CAD | 0.029 |
| Deuteranopia (no green cones) | #004FA8 | 0.018 |
| Tritanopia (no blue cones) | #006775 | 0.119 |
| Achromatopsia (no color) | #555555 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2151AA
#2151AA
oklch(45.6% 0.152 261.4)
- #715000
#715000
oklch(45.5% 0.094 81.1)
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 #2151AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.048
- Cobalt #1E488F ΔE 0.049
- Denim Blue #3B5B92 ΔE 0.058
- Blue Blue #2242C7 ΔE 0.058
- Blueberry #464196 ΔE 0.060
- Sapphire #2138AB ΔE 0.061
- Light Navy #155084 ΔE 0.064
- Light Navy Blue #2E5A88 ΔE 0.066
Use #2151AA 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.