#037BDB
Closest named color: Water Blue (#0E87CC). oklch(57.9% 0.172 251.9), rgb(3, 123, 219).
Aa
Black text reads best on this color (4.85:1).
About this color
#037BDB is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.172 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.044 away. Black text reads best on it, at 4.85:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.172) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 4.85:1 |
| White text | 4.32:1 |
Values
| HEX | #037BDB |
| RGB | rgb(3, 123, 219) |
| HSL | hsl(207, 97%, 44%) |
| OKLCH | oklch(57.9% 0.172 251.9) |
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 #037BDB | 4.32:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #037BDB | 4.85:1 | AA | Lc 34.9 | Non-text elements, placeholder text |
| #037BDB text on white | 4.32:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #037BDB text on black | 4.85:1 | AA | Lc -32.5 | 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
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C5DCF5
oklch(88.5% 0.042 250.5)
-
Step 300
300
#9DC4F2
oklch(80.8% 0.078 252.9)
-
Step 400
400
#64A5EB
oklch(70.8% 0.123 251.6)
-
Step 500
500
#338CE5
oklch(63.1% 0.158 251.9)
-
Step 600
600 (this color)
#037BDB
oklch(57.9% 0.172 251.9)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#005091
oklch(42.8% 0.126 251.5)
-
Step 900
900
#0C4276
oklch(37.6% 0.104 252.3)
-
Step 950
950
#0A2745
oklch(26.9% 0.066 252.2)
#037BDB 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) | #4783DF | 0.044 |
| Deuteranopia (no green cones) | #1872D9 | 0.023 |
| Tritanopia (no blue cones) | #0092A0 | 0.125 |
| Achromatopsia (no color) | #7A7A7A | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #037BDB
#037BDB
oklch(57.9% 0.172 251.9)
- #A76C00
#A76C00
oklch(58% 0.124 71.9)
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 #037BDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.044
- Windows Blue #3778BF ΔE 0.045
- Cerulean Blue #056EEE ΔE 0.046
- Royal Blue #4169E1 ΔE 0.052
- Clear Blue #247AFD ΔE 0.054
- Dark Sky Blue #448EE4 ΔE 0.065
- Nice Blue #107AB0 ΔE 0.067
- Mid Blue #276AB3 ΔE 0.071
Use #037BDB 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.