#1F37FC
Closest named color: Vibrant Blue (#0339F8). oklch(49.1% 0.281 266.5), rgb(31, 55, 252).
Aa
White text reads best on this color (6.97:1).
About this color
#1F37FC is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.281 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Vibrant Blue (#0339F8), ΔE 0.014 away. White text reads best on it, at 6.97:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.281) |
| Temperature | cool |
| Nearest name | Vibrant Blue (#0339F8) |
| Black text | 3.01:1 |
| White text | 6.97:1 |
Values
| HEX | #1F37FC |
| RGB | rgb(31, 55, 252) |
| HSL | hsl(233, 97%, 55%) |
| OKLCH | oklch(49.1% 0.281 266.5) |
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 #1F37FC | 6.97:1 | AA | Lc -87.6 | Fine for body text |
| Black text on #1F37FC | 3.01:1 | AA large text | Lc 21.6 | Dividers and decoration only |
| #1F37FC text on white | 6.97:1 | AA | Lc 82.5 | Fine for body text |
| #1F37FC text on black | 3.01:1 | AA large text | Lc -19.4 | Dividers and decoration only |
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 700.
-
Step 50
50
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A4BFFF
oklch(80.8% 0.096 266.6)
-
Step 400
400
#759CFF
oklch(70.8% 0.151 266.4)
-
Step 500
500
#527EFF
oklch(63% 0.198 266.5)
-
Step 600
600
#325DFF
oklch(55.6% 0.244 266.4)
-
Step 700
700 (this color)
#1F37FC
oklch(49.1% 0.281 266.5)
-
Step 800
800
#1931CB
oklch(42.7% 0.232 266.5)
-
Step 900
900
#17309F
oklch(37.7% 0.18 266.5)
-
Step 950
950
#0D1E5D
oklch(27% 0.114 266.6)
#1F37FC 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) | #0064FF | 0.082 |
| Deuteranopia (no green cones) | #004EF9 | 0.036 |
| Tritanopia (no blue cones) | #00759A | 0.211 |
| Achromatopsia (no color) | #595959 | 0.282 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F37FC
#1F37FC
oklch(49.1% 0.281 266.5)
- #7A5C00
#7A5C00
oklch(49.2% 0.101 86.4)
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 #1F37FC, closest first.
No curated palette has a color within ΔE 0.04 of #1F37FC.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vibrant Blue #0339F8 ΔE 0.014
- Vivid Blue #152EFF ΔE 0.015
- Light Royal Blue #3A2EFE ΔE 0.025
- Rich Blue #021BF9 ΔE 0.041
- Electric Blue #0652FF ΔE 0.045
- Strong Blue #0C06F7 ΔE 0.052
- Primary Blue #0804F9 ΔE 0.052
- Blue #0000FF ΔE 0.052
Use #1F37FC 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.