#2151BE
Closest named color: Blue Blue (#2242C7). oklch(47.2% 0.179 263.2), rgb(33, 81, 190).
Aa
White text reads best on this color (7.03:1).
About this color
#2151BE is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.179 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.037 away. White text reads best on it, at 7.03:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.179) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.98:1 |
| White text | 7.03:1 |
Values
| HEX | #2151BE |
| RGB | rgb(33, 81, 190) |
| HSL | hsl(222, 70%, 44%) |
| OKLCH | oklch(47.2% 0.179 263.2) |
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 #2151BE | 7.03:1 | AAA | Lc -88.7 | Fine for body text |
| Black text on #2151BE | 2.98:1 | Fails | Lc 20.3 | Dividers and decoration only |
| #2151BE text on white | 7.03:1 | AAA | Lc 83.7 | Fine for body text |
| #2151BE text on black | 2.98:1 | Fails | Lc -18.2 | 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 700.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C9DAFA
oklch(88.6% 0.048 263.1)
-
Step 300
300
#A3C1F9
oklch(80.9% 0.086 262.7)
-
Step 400
400
#729EF7
oklch(70.6% 0.14 263.3)
-
Step 500
500
#4E83F3
oklch(63% 0.177 263.2)
-
Step 600
600
#3369E2
oklch(55.5% 0.193 263.3)
-
Step 700
700 (this color)
#2151BE
oklch(47.2% 0.179 263.2)
-
Step 800
800
#21489F
oklch(42.8% 0.149 263.3)
-
Step 900
900
#1F3D7E
oklch(37.6% 0.116 263.3)
-
Step 950
950
#13244A
oklch(26.9% 0.074 264)
#2151BE 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) | #0060C2 | 0.037 |
| Deuteranopia (no green cones) | #0052BC | 0.015 |
| Tritanopia (no blue cones) | #006C7F | 0.138 |
| Achromatopsia (no color) | #595959 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2151BE
#2151BE
oklch(47.2% 0.179 263.2)
- #755500
#755500
oklch(47.1% 0.097 83.2)
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 #2151BE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.037
- Majorelle Blue #3F37C9 ΔE 0.060
- Sapphire #2138AB ΔE 0.067
- Warm Blue #4B57DB ΔE 0.067
- Blue With A Hint Of Purple #533CC6 ΔE 0.069
- Mid Blue #276AB3 ΔE 0.072
- Blurple #5539CC ΔE 0.076
- Azul #1D5DEC ΔE 0.077
Use #2151BE 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.