#2179E6
Closest named color: Cerulean Blue (#056EEE). oklch(58.6% 0.184 256.6), rgb(33, 121, 230).
Aa
Black text reads best on this color (4.94:1).
About this color
#2179E6 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.184 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.034 away. Black text reads best on it, at 4.94:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.184) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.94:1 |
| White text | 4.24:1 |
Values
| HEX | #2179E6 |
| RGB | rgb(33, 121, 230) |
| HSL | hsl(213, 80%, 52%) |
| OKLCH | oklch(58.6% 0.184 256.6) |
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 #2179E6 | 4.24:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #2179E6 | 4.94:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #2179E6 text on white | 4.24:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #2179E6 text on black | 4.94:1 | AA | Lc -32.9 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF8
oklch(88.5% 0.046 256.5)
-
Step 300
300
#9EC3F6
oklch(80.9% 0.083 256.5)
-
Step 400
400
#68A2F2
oklch(70.7% 0.133 256.7)
-
Step 500
500
#3C88ED
oklch(63% 0.169 256.7)
-
Step 600
600 (this color)
#2179E6
oklch(58.6% 0.184 256.6)
-
Step 700
700
#015CBF
oklch(49% 0.172 256.8)
-
Step 800
800
#094C9A
oklch(42.7% 0.142 256.6)
-
Step 900
900
#13407B
oklch(37.6% 0.111 256.9)
-
Step 950
950
#0D2648
oklch(27% 0.07 257)
#2179E6 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) | #3984EA | 0.035 |
| Deuteranopia (no green cones) | #0073E4 | 0.020 |
| Tritanopia (no blue cones) | #0093A4 | 0.139 |
| Achromatopsia (no color) | #7B7B7B | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2179E6
#2179E6
oklch(58.6% 0.184 256.6)
- #A57000
#A57000
oklch(58.6% 0.123 76.1)
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 #2179E6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.034
- Clear Blue #247AFD ΔE 0.035
- Royal Blue #4169E1 ΔE 0.041
- Water Blue #0E87CC ΔE 0.059
- Windows Blue #3778BF ΔE 0.060
- Neon Blue #4361EE ΔE 0.061
- Bright Blue #0165FC ΔE 0.063
- Dark Sky Blue #448EE4 ΔE 0.065
Use #2179E6 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.