#437FD5
Closest named color: Water Blue (#0E87CC). oklch(59.8% 0.146 257.6), rgb(67, 127, 213).
Aa
Black text reads best on this color (5.23:1).
About this color
#437FD5 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.146 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.037 away. Black text reads best on it, at 5.23:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.23:1 |
| White text | 4.01:1 |
Values
| HEX | #437FD5 |
| RGB | rgb(67, 127, 213) |
| HSL | hsl(215, 63%, 55%) |
| OKLCH | oklch(59.8% 0.146 257.6) |
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 #437FD5 | 4.01:1 | AA large text | Lc -72.6 | Content text, not long reading |
| Black text on #437FD5 | 5.23:1 | AA | Lc 37.0 | Non-text elements, placeholder text |
| #437FD5 text on white | 4.01:1 | AA large text | Lc 67.1 | Content text, not long reading |
| #437FD5 text on black | 5.23:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DBF4
oklch(88.6% 0.04 256.6)
-
Step 300
300
#A4C3EF
oklch(81% 0.071 257.1)
-
Step 400
400
#73A2E7
oklch(70.7% 0.114 257.9)
-
Step 500
500 (this color)
#437FD5
oklch(59.8% 0.146 257.6)
-
Step 600
600
#2F71CE
oklch(55.6% 0.159 257.7)
-
Step 700
700
#215EB2
oklch(49% 0.147 257.6)
-
Step 800
800
#1E4D90
oklch(42.6% 0.122 257.9)
-
Step 900
900
#1E4173
oklch(37.7% 0.095 257.6)
-
Step 950
950
#122643
oklch(26.9% 0.06 257.7)
#437FD5 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) | #5786D8 | 0.029 |
| Deuteranopia (no green cones) | #4079D3 | 0.017 |
| Tritanopia (no blue cones) | #0093A0 | 0.116 |
| Achromatopsia (no color) | #7F7F7F | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #437FD5
#437FD5
oklch(59.8% 0.146 257.6)
- #A87400
#A87400
oklch(59.7% 0.125 77.5)
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 #437FD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.037
- Windows Blue #3778BF ΔE 0.039
- Dark Sky Blue #448EE4 ΔE 0.043
- Cool Blue #4984B8 ΔE 0.050
- Soft Blue #6488EA ΔE 0.054
- Steel Blue #4682B4 ΔE 0.054
- Royal Blue #4169E1 ΔE 0.063
- Clear Blue #247AFD ΔE 0.066
Use #437FD5 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.