#21A4E2
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.1% 0.139 236.1), rgb(33, 164, 226).
Aa
Black text reads best on this color (7.47:1).
About this color
#21A4E2 is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.139 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.051 away. Black text reads best on it, at 7.47:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.47:1 |
| White text | 2.81:1 |
Values
| HEX | #21A4E2 |
| RGB | rgb(33, 164, 226) |
| HSL | hsl(199, 77%, 51%) |
| OKLCH | oklch(68.1% 0.139 236.1) |
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 #21A4E2 | 2.81:1 | Fails | Lc -58.8 | Large or bold text, headings |
| Black text on #21A4E2 | 7.47:1 | AAA | Lc 50.5 | Large or bold text, headings |
| #21A4E2 text on white | 2.81:1 | Fails | Lc 53.5 | Large or bold text, headings |
| #21A4E2 text on black | 7.47:1 | AAA | Lc -48.3 | Large or bold text, headings |
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 400.
-
Step 50
50
#EEF7FC
oklch(97.1% 0.012 231.7)
-
Step 100
100
#DBEDF9
oklch(93.6% 0.025 236.8)
-
Step 200
200
#BCDFF5
oklch(88.5% 0.048 235.7)
-
Step 300
300
#89CAF1
oklch(80.9% 0.086 235.6)
-
Step 400
400 (this color)
#21A4E2
oklch(68.1% 0.139 236.1)
-
Step 500
500
#0094D0
oklch(63.1% 0.136 236.2)
-
Step 600
600
#007CB0
oklch(55.5% 0.121 236.7)
-
Step 700
700
#006994
oklch(49.2% 0.105 235.5)
-
Step 800
800
#00567A
oklch(42.8% 0.091 235.4)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#21A4E2 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) | #86A4E5 | 0.081 |
| Deuteranopia (no green cones) | #6D93E1 | 0.065 |
| Tritanopia (no blue cones) | #00B4B9 | 0.087 |
| Achromatopsia (no color) | #9A9A9A | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21A4E2
#21A4E2
oklch(68.1% 0.139 236.1)
- #D87F37
#D87F37
oklch(68.1% 0.139 56.1)
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 #21A4E2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.051
- Dark Sky Blue #448EE4 ΔE 0.061
- Cornflower Blue #6495ED ΔE 0.062
- Turquoise Blue #06B1C4 ΔE 0.066
- Dodger Blue #1E90FF ΔE 0.076
- Deep Sky Blue #00BFFF ΔE 0.077
- Faded Blue #658CBB ΔE 0.082
- Water Blue #0E87CC ΔE 0.084
Use #21A4E2 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.