#737990
Closest named color: Slate Gray (#708090). oklch(57.9% 0.036 273.7), rgb(115, 121, 144).
Aa
Black text reads best on this color (4.86:1).
About this color
#737990 is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.036 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Slate Gray (#708090), ΔE 0.020 away. Black text reads best on it, at 4.86:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Slate Gray (#708090) |
| Black text | 4.86:1 |
| White text | 4.31:1 |
Values
| HEX | #737990 |
| RGB | rgb(115, 121, 144) |
| HSL | hsl(228, 12%, 51%) |
| OKLCH | oklch(57.9% 0.036 273.7) |
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 #737990 | 4.31:1 | AA large text | Lc -75.4 | Fine for body text |
| Black text on #737990 | 4.86:1 | AA | Lc 34.2 | Non-text elements, placeholder text |
| #737990 text on white | 4.31:1 | AA large text | Lc 69.9 | Content text, not long reading |
| #737990 text on black | 4.86:1 | AA | Lc -31.8 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E9EAED
oklch(93.7% 0.004 271.4)
-
Step 200
200
#D7D9DF
oklch(88.6% 0.008 271.3)
-
Step 300
300
#BDC0CB
oklch(80.9% 0.016 273.8)
-
Step 400
400
#9BA0B1
oklch(70.7% 0.025 272.7)
-
Step 500
500
#83889E
oklch(63% 0.034 275.3)
-
Step 600
600 (this color)
#737990
oklch(57.9% 0.036 273.7)
-
Step 700
700
#5A6074
oklch(49.1% 0.033 272)
-
Step 800
800
#4A4E5F
oklch(42.7% 0.029 274.7)
-
Step 900
900
#3E414D
oklch(37.7% 0.021 274.3)
-
Step 950
950
#24262D
oklch(27% 0.013 272.9)
#737990 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) | #737B91 | 0.006 |
| Deuteranopia (no green cones) | #71798F | 0.003 |
| Tritanopia (no blue cones) | #6C7D81 | 0.031 |
| Achromatopsia (no color) | #7A7A7A | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #737990
#737990
oklch(57.9% 0.036 273.7)
- #817A62
#817A62
oklch(57.9% 0.036 93.7)
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 #737990, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate Gray #708090 ΔE 0.020
- Grey Blue #647D8E ΔE 0.023
- Battleship Grey #6B7C85 ΔE 0.025
- Lavender Gray #7E7F9A ΔE 0.027
- Steel Grey #6F828A ΔE 0.031
- Battleship Gray #6C757D ΔE 0.032
- Steel #738595 ΔE 0.033
- Purple Grey #866F85 ΔE 0.037
Use #737990 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.