#21A1D7
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.8% 0.13 232.9), rgb(33, 161, 215).
Aa
Black text reads best on this color (7.14:1).
About this color
#21A1D7 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.130 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.058 away. Black text reads best on it, at 7.14:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.14:1 |
| White text | 2.93:1 |
Values
| HEX | #21A1D7 |
| RGB | rgb(33, 161, 215) |
| HSL | hsl(198, 73%, 49%) |
| OKLCH | oklch(66.8% 0.13 232.9) |
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 #21A1D7 | 2.93:1 | Fails | Lc -60.7 | Content text, not long reading |
| Black text on #21A1D7 | 7.14:1 | AAA | Lc 48.7 | Large or bold text, headings |
| #21A1D7 text on white | 2.93:1 | Fails | Lc 55.4 | Large or bold text, headings |
| #21A1D7 text on black | 7.14:1 | AAA | Lc -46.4 | 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 500.
-
Step 50
50
#F0F7FA
oklch(97.2% 0.008 225.1)
-
Step 100
100
#DEECF4
oklch(93.5% 0.018 232.5)
-
Step 200
200
#C3DEED
oklch(88.5% 0.035 232.1)
-
Step 300
300
#98C8E3
oklch(80.8% 0.063 233.2)
-
Step 400
400
#58ABD6
oklch(70.6% 0.102 233.4)
-
Step 500
500 (this color)
#21A1D7
oklch(66.8% 0.13 232.9)
-
Step 600
600
#007DAB
oklch(55.5% 0.115 233.2)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#004864
oklch(37.8% 0.078 232.8)
-
Step 950
950
#022A3C
oklch(26.9% 0.054 233.4)
#21A1D7 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) | #86A0DA | 0.083 |
| Deuteranopia (no green cones) | #6E8FD6 | 0.069 |
| Tritanopia (no blue cones) | #00AFB3 | 0.077 |
| Achromatopsia (no color) | #969696 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21A1D7
#21A1D7
oklch(66.8% 0.13 232.9)
- #D27C41
#D27C41
oklch(66.9% 0.13 52.9)
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 #21A1D7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.058
- Turquoise Blue #06B1C4 ΔE 0.061
- Dark Sky Blue #448EE4 ΔE 0.061
- Cornflower Blue #6495ED ΔE 0.068
- Faded Blue #658CBB ΔE 0.071
- Water Blue #0E87CC ΔE 0.074
- Greyblue #77A1B5 ΔE 0.078
- Blue NCS #118AB2 ΔE 0.079
Use #21A1D7 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.