#42ABF6
Closest named color: Deep Sky Blue (#00BFFF). oklch(71.4% 0.145 243.8), rgb(66, 171, 246).
Aa
Black text reads best on this color (8.38:1).
About this color
#42ABF6 is a medium-light, vivid blue. In OKLCH its lightness is 71%, its chroma 0.145 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.053 away. Black text reads best on it, at 8.38:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.38:1 |
| White text | 2.50:1 |
Values
| HEX | #42ABF6 |
| RGB | rgb(66, 171, 246) |
| HSL | hsl(205, 91%, 61%) |
| OKLCH | oklch(71.4% 0.145 243.8) |
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 #42ABF6 | 2.50:1 | Fails | Lc -53.8 | Large or bold text, headings |
| Black text on #42ABF6 | 8.38:1 | AAA | Lc 55.2 | Large or bold text, headings |
| #42ABF6 text on white | 2.50:1 | Fails | Lc 48.8 | Large or bold text, headings |
| #42ABF6 text on black | 8.38:1 | AAA | Lc -53.2 | 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
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DCECFB
oklch(93.6% 0.027 246.3)
-
Step 200
200
#BEDEF9
oklch(88.6% 0.05 243.8)
-
Step 300
300
#8DC8F7
oklch(81% 0.09 243.2)
-
Step 400
400 (this color)
#42ABF6
oklch(71.4% 0.145 243.8)
-
Step 500
500
#0091DF
oklch(63.2% 0.154 243.6)
-
Step 600
600
#0079BC
oklch(55.5% 0.136 243.9)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800
#005383
oklch(42.6% 0.105 243.8)
-
Step 900
900
#00456F
oklch(37.6% 0.093 244.3)
-
Step 950
950
#002944
oklch(27% 0.066 243.6)
#42ABF6 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) | #88ADF9 | 0.065 |
| Deuteranopia (no green cones) | #6F9CF5 | 0.050 |
| Tritanopia (no blue cones) | #00BDC6 | 0.101 |
| Achromatopsia (no color) | #A4A4A4 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42ABF6
#42ABF6
oklch(71.4% 0.145 243.8)
- #E18C2E
#E18C2E
oklch(71.4% 0.145 63.4)
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 #42ABF6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.053
- Chefchaouen Blue #4895EF ΔE 0.058
- Cornflower Blue #6495ED ΔE 0.059
- Dark Sky Blue #448EE4 ΔE 0.078
- Carolina Blue #8AB8FE ΔE 0.078
- Dodger Blue #1E90FF ΔE 0.081
- Periwinkle Blue #8F99FB ΔE 0.084
- Turquoise Blue #06B1C4 ΔE 0.086
Use #42ABF6 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.