#2170EF
Closest named color: Cerulean Blue (#056EEE). oklch(57.4% 0.206 260), rgb(33, 112, 239).
Aa
Black text reads best on this color (4.62:1).
About this color
#2170EF is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.206 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.011 away. Black text reads best on it, at 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.206) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.62:1 |
| White text | 4.53:1 |
Values
| HEX | #2170EF |
| RGB | rgb(33, 112, 239) |
| HSL | hsl(217, 87%, 53%) |
| OKLCH | oklch(57.4% 0.206 260) |
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 #2170EF | 4.53:1 | AA | Lc -76.3 | Fine for body text |
| Black text on #2170EF | 4.62:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #2170EF text on white | 4.53:1 | AA | Lc 70.8 | Content text, not long reading |
| #2170EF text on black | 4.62:1 | AA | Lc -30.9 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DAFC
oklch(88.4% 0.052 261.1)
-
Step 300
300
#9EC2FD
oklch(80.9% 0.093 260.1)
-
Step 400
400
#68A0FC
oklch(70.8% 0.148 259.9)
-
Step 500
500
#3E84FA
oklch(63.1% 0.19 260.2)
-
Step 600
600 (this color)
#2170EF
oklch(57.4% 0.206 260)
-
Step 700
700
#0B57CA
oklch(49% 0.191 260.1)
-
Step 800
800
#0F48A4
oklch(42.7% 0.159 260.2)
-
Step 900
900
#153E82
oklch(37.8% 0.124 260.1)
-
Step 950
950
#0D254C
oklch(27% 0.078 259.7)
#2170EF 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) | #0080F3 | 0.039 |
| Deuteranopia (no green cones) | #006DED | 0.014 |
| Tritanopia (no blue cones) | #0090A5 | 0.158 |
| Achromatopsia (no color) | #767676 | 0.206 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2170EF
#2170EF
oklch(57.4% 0.206 260)
- #9D6F00
#9D6F00
oklch(57.4% 0.119 79.8)
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 #2170EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.011
- Royal Blue #4169E1 ΔE 0.031
- Clear Blue #247AFD ΔE 0.032
- Bright Blue #0165FC ΔE 0.036
- Neon Blue #4361EE ΔE 0.039
- Azul #1D5DEC ΔE 0.046
- Warm Blue #4B57DB ΔE 0.067
- Electric Blue #0652FF ΔE 0.074
Use #2170EF 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.