#37A4FE
Closest named color: Chefchaouen Blue (#4895EF). oklch(70% 0.164 248), rgb(55, 164, 254).
Aa
Black text reads best on this color (7.90:1).
About this color
#37A4FE is a medium-light, vivid blue. In OKLCH its lightness is 70%, its chroma 0.164 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.041 away. Black text reads best on it, at 7.90:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.90:1 |
| White text | 2.65:1 |
Values
| HEX | #37A4FE |
| RGB | rgb(55, 164, 254) |
| HSL | hsl(207, 99%, 61%) |
| OKLCH | oklch(70% 0.164 248) |
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 #37A4FE | 2.65:1 | Fails | Lc -56.4 | Large or bold text, headings |
| Black text on #37A4FE | 7.90:1 | AAA | Lc 52.8 | Large or bold text, headings |
| #37A4FE text on white | 2.65:1 | Fails | Lc 51.2 | Large or bold text, headings |
| #37A4FE text on black | 7.90:1 | AAA | Lc -50.7 | 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
#EFF7FE
oklch(97.2% 0.013 244.3)
-
Step 100
100
#DBECFD
oklch(93.6% 0.029 248.1)
-
Step 200
200
#BCDDFE
oklch(88.4% 0.058 248.5)
-
Step 300
300
#8BC7FF
oklch(81% 0.101 247.5)
-
Step 400
400 (this color)
#37A4FE
oklch(70% 0.164 248)
-
Step 500
500
#008EEA
oklch(63.2% 0.17 248)
-
Step 600
600
#0077C6
oklch(55.6% 0.15 248.2)
-
Step 700
700
#0064A7
oklch(49.1% 0.132 247.9)
-
Step 800
800
#00528A
oklch(42.8% 0.115 247.8)
-
Step 900
900
#004474
oklch(37.7% 0.101 247.8)
-
Step 950
950
#002848
oklch(27% 0.073 248.1)
#37A4FE 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) | #7AA9FF | 0.059 |
| Deuteranopia (no green cones) | #5C97FC | 0.039 |
| Tritanopia (no blue cones) | #00BAC5 | 0.119 |
| Achromatopsia (no color) | #9F9F9F | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37A4FE
#37A4FE
oklch(70% 0.164 248)
- #DC8900
#DC8900
oklch(70.1% 0.154 67.9)
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 #37A4FE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.041
- Cornflower Blue #6495ED ΔE 0.049
- Dodger Blue #1E90FF ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.063
- Deep Sky Blue #00BFFF ΔE 0.072
- Soft Blue #6488EA ΔE 0.076
- Periwinkle Blue #8F99FB ΔE 0.083
- Carolina Blue #8AB8FE ΔE 0.096
Use #37A4FE 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.