#307FDE
Closest named color: Water Blue (#0E87CC). oklch(59.7% 0.164 255.3), rgb(48, 127, 222).
Aa
Black text reads best on this color (5.21:1).
About this color
#307FDE is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.164 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.040 away. Black text reads best on it, at 5.21:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.21:1 |
| White text | 4.02:1 |
Values
| HEX | #307FDE |
| RGB | rgb(48, 127, 222) |
| HSL | hsl(213, 73%, 53%) |
| OKLCH | oklch(59.7% 0.164 255.3) |
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 #307FDE | 4.02:1 | AA large text | Lc -72.6 | Content text, not long reading |
| Black text on #307FDE | 5.21:1 | AA | Lc 37.0 | Non-text elements, placeholder text |
| #307FDE text on white | 4.02:1 | AA large text | Lc 67.1 | Content text, not long reading |
| #307FDE text on black | 5.21:1 | AA | Lc -34.6 | Non-text elements, placeholder text |
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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9EC3F4
oklch(80.8% 0.08 255.6)
-
Step 400
400
#68A3EF
oklch(70.7% 0.128 255.3)
-
Step 500
500 (this color)
#307FDE
oklch(59.7% 0.164 255.3)
-
Step 600
600
#1071D8
oklch(55.6% 0.178 255.4)
-
Step 700
700
#005EBA
oklch(49.1% 0.163 255.3)
-
Step 800
800
#074D97
oklch(42.6% 0.137 255.3)
-
Step 900
900
#124178
oklch(37.6% 0.106 255.1)
-
Step 950
950
#0D2747
oklch(27.2% 0.068 255.2)
#307FDE 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) | #4F87E2 | 0.036 |
| Deuteranopia (no green cones) | #2E77DC | 0.022 |
| Tritanopia (no blue cones) | #0096A4 | 0.124 |
| Achromatopsia (no color) | #7F7F7F | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #307FDE
#307FDE
oklch(59.7% 0.164 255.3)
- #AA7300
#AA7300
oklch(59.8% 0.126 75.7)
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 #307FDE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.040
- Dark Sky Blue #448EE4 ΔE 0.046
- Windows Blue #3778BF ΔE 0.048
- Clear Blue #247AFD ΔE 0.050
- Royal Blue #4169E1 ΔE 0.056
- Cerulean Blue #056EEE ΔE 0.057
- Soft Blue #6488EA ΔE 0.059
- Dodger Blue #1E90FF ΔE 0.061
Use #307FDE 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.