#646F88
Closest named color: Metallic Blue (#4F738E). oklch(54.2% 0.041 266.4), rgb(100, 111, 136).
Aa
White text reads best on this color (5.03:1).
About this color
#646F88 is a medium-dark, muted blue. In OKLCH its lightness is 54%, its chroma 0.041 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.028 away. White text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.17:1 |
| White text | 5.03:1 |
Values
| HEX | #646F88 |
| RGB | rgb(100, 111, 136) |
| HSL | hsl(222, 15%, 46%) |
| OKLCH | oklch(54.2% 0.041 266.4) |
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 #646F88 | 5.03:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #646F88 | 4.17:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #646F88 text on white | 5.03:1 | AA | Lc 74.8 | Content text, not long reading |
| #646F88 text on black | 4.17:1 | AA large text | Lc -26.9 | Dividers and decoration only |
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
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D6D9E0
oklch(88.5% 0.01 267.4)
-
Step 300
300
#BBC1CD
oklch(81% 0.018 264.5)
-
Step 400
400
#98A1B4
oklch(70.8% 0.03 265.4)
-
Step 500
500
#7F89A1
oklch(63% 0.038 267.4)
-
Step 600
600 (this color)
#646F88
oklch(54.2% 0.041 266.4)
-
Step 700
700
#576177
oklch(49.2% 0.037 265.8)
-
Step 800
800
#474F61
oklch(42.8% 0.032 266.2)
-
Step 900
900
#3B414F
oklch(37.5% 0.025 266.9)
-
Step 950
950
#23262E
oklch(26.9% 0.016 269.1)
#646F88 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) | #677189 | 0.008 |
| Deuteranopia (no green cones) | #646D87 | 0.006 |
| Tritanopia (no blue cones) | #5B7477 | 0.037 |
| Achromatopsia (no color) | #6F6F6F | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646F88
#646F88
oklch(54.2% 0.041 266.4)
- #7A6E54
#7A6E54
oklch(54.2% 0.041 86.1)
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 #646F88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.028
- Battleship Gray #6C757D ΔE 0.031
- Grey Blue #647D8E ΔE 0.040
- Dull Blue #49759C ΔE 0.042
- Battleship Grey #6B7C85 ΔE 0.043
- Stormy Blue #507B9C ΔE 0.043
- Dim Gray #696969 ΔE 0.046
- Grey Purple #826D8C ΔE 0.047
Use #646F88 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.