#307EDB
Closest named color: Water Blue (#0E87CC). oklch(59.3% 0.161 255.1), rgb(48, 126, 219).
Aa
Black text reads best on this color (5.13:1).
About this color
#307EDB is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.161 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.038 away. Black text reads best on it, at 5.13:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.161) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.13:1 |
| White text | 4.09:1 |
Values
| HEX | #307EDB |
| RGB | rgb(48, 126, 219) |
| HSL | hsl(213, 70%, 52%) |
| OKLCH | oklch(59.3% 0.161 255.1) |
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 #307EDB | 4.09:1 | AA large text | Lc -73.1 | Content text, not long reading |
| Black text on #307EDB | 5.13:1 | AA | Lc 36.4 | Non-text elements, placeholder text |
| #307EDB text on white | 4.09:1 | AA large text | Lc 67.6 | Content text, not long reading |
| #307EDB text on black | 5.13:1 | AA | Lc -34.0 | 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 600.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A2C3EF
oklch(80.8% 0.072 255.7)
-
Step 400
400
#6EA3E8
oklch(70.7% 0.116 255.5)
-
Step 500
500
#458AE1
oklch(63% 0.149 255.4)
-
Step 600
600 (this color)
#307EDB
oklch(59.3% 0.161 255.1)
-
Step 700
700
#145FB3
oklch(49% 0.15 255.3)
-
Step 800
800
#154E91
oklch(42.7% 0.125 255.4)
-
Step 900
900
#194273
oklch(37.8% 0.096 254.8)
-
Step 950
950
#102744
oklch(27.1% 0.062 255.3)
#307EDB 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) | #4F86DF | 0.036 |
| Deuteranopia (no green cones) | #2F76D9 | 0.021 |
| Tritanopia (no blue cones) | #0094A2 | 0.122 |
| Achromatopsia (no color) | #7D7D7D | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #307EDB
#307EDB
oklch(59.3% 0.161 255.1)
- #A97200
#A97200
oklch(59.5% 0.125 75.4)
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 #307EDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.038
- Windows Blue #3778BF ΔE 0.043
- Dark Sky Blue #448EE4 ΔE 0.049
- Clear Blue #247AFD ΔE 0.054
- Royal Blue #4169E1 ΔE 0.055
- Cerulean Blue #056EEE ΔE 0.058
- Soft Blue #6488EA ΔE 0.062
- Cool Blue #4984B8 ΔE 0.062
Use #307EDB 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.