#2170E8
Closest named color: Cerulean Blue (#056EEE). oklch(56.9% 0.197 259.4), rgb(33, 112, 232).
Aa
White text reads best on this color (4.61:1).
About this color
#2170E8 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.197 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.014 away. White text reads best on it, at 4.61:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.197) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.54:1 |
| White text | 4.61:1 |
Values
| HEX | #2170E8 |
| RGB | rgb(33, 112, 232) |
| HSL | hsl(216, 81%, 52%) |
| OKLCH | oklch(56.9% 0.197 259.4) |
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 #2170E8 | 4.61:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #2170E8 | 4.54:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #2170E8 text on white | 4.61:1 | AA | Lc 71.4 | Content text, not long reading |
| #2170E8 text on black | 4.54:1 | AA | Lc -30.3 | 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
#C6DBFA
oklch(88.6% 0.048 258)
-
Step 300
300
#9FC2FA
oklch(80.9% 0.088 259.7)
-
Step 400
400
#69A0F8
oklch(70.6% 0.142 259.4)
-
Step 500
500
#3F86F5
oklch(63.2% 0.181 259.2)
-
Step 600
600 (this color)
#2170E8
oklch(56.9% 0.197 259.4)
-
Step 700
700
#0D59C6
oklch(49.1% 0.184 259.4)
-
Step 800
800
#104AA0
oklch(42.8% 0.151 259.2)
-
Step 900
900
#163F7F
oklch(37.8% 0.118 259.3)
-
Step 950
950
#0E254A
oklch(26.9% 0.075 259.5)
#2170E8 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) | #157EEC | 0.035 |
| Deuteranopia (no green cones) | #006DE6 | 0.014 |
| Tritanopia (no blue cones) | #008EA1 | 0.151 |
| Achromatopsia (no color) | #757575 | 0.197 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2170E8
#2170E8
oklch(56.9% 0.197 259.4)
- #9C6D00
#9C6D00
oklch(56.9% 0.118 78.8)
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 #2170E8, closest first.
No curated palette has a color within ΔE 0.04 of #2170E8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.014
- Royal Blue #4169E1 ΔE 0.027
- Clear Blue #247AFD ΔE 0.039
- Neon Blue #4361EE ΔE 0.041
- Bright Blue #0165FC ΔE 0.043
- Azul #1D5DEC ΔE 0.047
- Warm Blue #4B57DB ΔE 0.064
- Windows Blue #3778BF ΔE 0.071
Use #2170E8 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.