#307FDA
Closest named color: Water Blue (#0E87CC). oklch(59.5% 0.158 254.5), rgb(48, 127, 218).
Aa
Black text reads best on this color (5.17:1).
About this color
#307FDA is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.158 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.036 away. Black text reads best on it, at 5.17:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.17:1 |
| White text | 4.05:1 |
Values
| HEX | #307FDA |
| RGB | rgb(48, 127, 218) |
| HSL | hsl(212, 70%, 52%) |
| OKLCH | oklch(59.5% 0.158 254.5) |
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 #307FDA | 4.05:1 | AA large text | Lc -72.9 | Content text, not long reading |
| Black text on #307FDA | 5.17:1 | AA | Lc 36.7 | Non-text elements, placeholder text |
| #307FDA text on white | 4.05:1 | AA large text | Lc 67.4 | Content text, not long reading |
| #307FDA text on black | 5.17:1 | AA | Lc -34.3 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DBF6
oklch(88.4% 0.044 254.8)
-
Step 300
300
#9FC4F2
oklch(81% 0.077 254.1)
-
Step 400
400
#69A3EC
oklch(70.6% 0.124 254.8)
-
Step 500
500 (this color)
#307FDA
oklch(59.5% 0.158 254.5)
-
Step 600
600
#1172D4
oklch(55.6% 0.172 254.4)
-
Step 700
700
#005FB8
oklch(49.1% 0.16 254.6)
-
Step 800
800
#084E95
oklch(42.7% 0.133 254.5)
-
Step 900
900
#134277
oklch(37.8% 0.103 254.4)
-
Step 950
950
#0D2745
oklch(27% 0.064 254)
#307FDA 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) | #5286DE | 0.037 |
| Deuteranopia (no green cones) | #3377D8 | 0.021 |
| Tritanopia (no blue cones) | #0095A2 | 0.120 |
| Achromatopsia (no color) | #7E7E7E | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #307FDA
#307FDA
oklch(59.5% 0.158 254.5)
- #AA7200
#AA7200
oklch(59.6% 0.126 74.9)
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 #307FDA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.036
- Windows Blue #3778BF ΔE 0.042
- Dark Sky Blue #448EE4 ΔE 0.047
- Clear Blue #247AFD ΔE 0.056
- Royal Blue #4169E1 ΔE 0.058
- Cool Blue #4984B8 ΔE 0.060
- Cerulean Blue #056EEE ΔE 0.061
- Soft Blue #6488EA ΔE 0.061
Use #307FDA 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.