#37ACFC
Closest named color: Deep Sky Blue (#00BFFF). oklch(71.7% 0.154 243.7), rgb(55, 172, 252).
Aa
Black text reads best on this color (8.46:1).
About this color
#37ACFC is a medium-light, vivid blue. In OKLCH its lightness is 72%, its chroma 0.154 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.050 away. Black text reads best on it, at 8.46:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.46:1 |
| White text | 2.47:1 |
Values
| HEX | #37ACFC |
| RGB | rgb(55, 172, 252) |
| HSL | hsl(204, 97%, 60%) |
| OKLCH | oklch(71.7% 0.154 243.7) |
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 #37ACFC | 2.47:1 | Fails | Lc -53.3 | Large or bold text, headings |
| Black text on #37ACFC | 8.46:1 | AAA | Lc 55.7 | Large or bold text, headings |
| #37ACFC text on white | 2.47:1 | Fails | Lc 48.3 | Large or bold text, headings |
| #37ACFC text on black | 8.46:1 | AAA | Lc -53.7 | 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
#EEF7FE
oklch(97.1% 0.013 241)
-
Step 100
100
#DBEDFC
oklch(93.7% 0.028 243.1)
-
Step 200
200
#BCDEFB
oklch(88.5% 0.054 244.2)
-
Step 300
300
#89C8FB
oklch(80.9% 0.097 243.8)
-
Step 400
400 (this color)
#37ACFC
oklch(71.7% 0.154 243.7)
-
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
#00456E
oklch(37.6% 0.092 243.7)
-
Step 950
950
#002944
oklch(27% 0.066 243.6)
#37ACFC 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) | #87AEFF | 0.069 |
| Deuteranopia (no green cones) | #6B9CFB | 0.053 |
| Tritanopia (no blue cones) | #00C0C9 | 0.107 |
| Achromatopsia (no color) | #A4A4A4 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37ACFC
#37ACFC
oklch(71.7% 0.154 243.7)
- #E58B1E
#E58B1E
oklch(71.6% 0.154 63.7)
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 #37ACFC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.050
- Chefchaouen Blue #4895EF ΔE 0.060
- Cornflower Blue #6495ED ΔE 0.063
- Dodger Blue #1E90FF ΔE 0.079
- Dark Sky Blue #448EE4 ΔE 0.081
- Carolina Blue #8AB8FE ΔE 0.081
- Bright Sky Blue #02CCFE ΔE 0.086
- Periwinkle Blue #8F99FB ΔE 0.088
Use #37ACFC 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.