#037DDE
Closest named color: Water Blue (#0E87CC). oklch(58.6% 0.173 251.8), rgb(3, 125, 222).
Aa
Black text reads best on this color (4.99:1).
About this color
#037DDE is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.173 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.043 away. Black text reads best on it, at 4.99:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 4.99:1 |
| White text | 4.20:1 |
Values
| HEX | #037DDE |
| RGB | rgb(3, 125, 222) |
| HSL | hsl(207, 97%, 44%) |
| OKLCH | oklch(58.6% 0.173 251.8) |
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 #037DDE | 4.20:1 | AA large text | Lc -73.8 | Content text, not long reading |
| Black text on #037DDE | 4.99:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #037DDE text on white | 4.20:1 | AA large text | Lc 68.3 | Content text, not long reading |
| #037DDE text on black | 4.99:1 | AA | Lc -33.4 | 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
#C5DCF6
oklch(88.6% 0.044 251.5)
-
Step 300
300
#9CC5F2
oklch(81% 0.078 251.1)
-
Step 400
400
#63A5EC
oklch(70.8% 0.125 251.6)
-
Step 500
500
#318CE6
oklch(63.1% 0.16 251.8)
-
Step 600
600 (this color)
#037DDE
oklch(58.6% 0.173 251.8)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#005091
oklch(42.8% 0.126 251.5)
-
Step 900
900
#0A4276
oklch(37.6% 0.104 252)
-
Step 950
950
#0A2745
oklch(26.9% 0.066 252.2)
#037DDE 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) | #4985E2 | 0.045 |
| Deuteranopia (no green cones) | #1A73DC | 0.026 |
| Tritanopia (no blue cones) | #0095A3 | 0.127 |
| Achromatopsia (no color) | #7B7B7B | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #037DDE
#037DDE
oklch(58.6% 0.173 251.8)
- #A96D00
#A96D00
oklch(58.5% 0.125 71.6)
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 #037DDE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.043
- Cerulean Blue #056EEE ΔE 0.048
- Windows Blue #3778BF ΔE 0.049
- Clear Blue #247AFD ΔE 0.050
- Royal Blue #4169E1 ΔE 0.055
- Dark Sky Blue #448EE4 ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.068
- Nice Blue #107AB0 ΔE 0.071
Use #037DDE 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.