#2175E0
Closest named color: Cerulean Blue (#056EEE). oklch(57.3% 0.181 257), rgb(33, 117, 224).
Aa
Black text reads best on this color (4.68:1).
About this color
#2175E0 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.181 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.031 away. Black text reads best on it, at 4.68:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.181) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.68:1 |
| White text | 4.48:1 |
Values
| HEX | #2175E0 |
| RGB | rgb(33, 117, 224) |
| HSL | hsl(214, 75%, 50%) |
| OKLCH | oklch(57.3% 0.181 257) |
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 #2175E0 | 4.48:1 | AA large text | Lc -76.0 | Fine for body text |
| Black text on #2175E0 | 4.68:1 | AA | Lc 33.6 | Non-text elements, placeholder text |
| #2175E0 text on white | 4.48:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #2175E0 text on black | 4.68:1 | AA | Lc -31.1 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF7
oklch(88.5% 0.044 256.8)
-
Step 300
300
#9FC3F5
oklch(80.9% 0.081 256.7)
-
Step 400
400
#6AA2F1
oklch(70.7% 0.131 257.1)
-
Step 500
500
#3F88EC
oklch(63.1% 0.167 257.1)
-
Step 600
600 (this color)
#2175E0
oklch(57.3% 0.181 257)
-
Step 700
700
#095DBD
oklch(49.2% 0.168 256.8)
-
Step 800
800
#0E4C99
oklch(42.7% 0.14 257)
-
Step 900
900
#15407A
oklch(37.6% 0.109 257.2)
-
Step 950
950
#0E2647
oklch(27% 0.068 257.1)
#2175E0 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) | #3680E4 | 0.034 |
| Deuteranopia (no green cones) | #006FDE | 0.021 |
| Tritanopia (no blue cones) | #008FA0 | 0.137 |
| Achromatopsia (no color) | #777777 | 0.181 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2175E0
#2175E0
oklch(57.3% 0.181 257)
- #9F6D00
#9F6D00
oklch(57.2% 0.12 77)
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 #2175E0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.031
- Royal Blue #4169E1 ΔE 0.034
- Clear Blue #247AFD ΔE 0.045
- Windows Blue #3778BF ΔE 0.054
- Neon Blue #4361EE ΔE 0.056
- Bright Blue #0165FC ΔE 0.061
- Water Blue #0E87CC ΔE 0.062
- Azul #1D5DEC ΔE 0.063
Use #2175E0 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.