#637B64
Closest named color: Dark Sage (#598556). oklch(55.7% 0.045 146), rgb(99, 123, 100).
Aa
White text reads best on this color (4.61:1).
About this color
#637B64 is a medium-dark, muted green. In OKLCH its lightness is 56%, its chroma 0.045 and its hue 146°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Sage (#598556), ΔE 0.044 away. White text reads best on it, at 4.61:1.
| Hue family | Greens |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.045) |
| Temperature | in between |
| Nearest name | Dark Sage (#598556) |
| Black text | 4.54:1 |
| White text | 4.61:1 |
Values
| HEX | #637B64 |
| RGB | rgb(99, 123, 100) |
| HSL | hsl(122, 11%, 44%) |
| OKLCH | oklch(55.7% 0.045 146) |
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 #637B64 | 4.61:1 | AA | Lc -77.5 | Fine for body text |
| Black text on #637B64 | 4.54:1 | AA | Lc 32.0 | Non-text elements, placeholder text |
| #637B64 text on white | 4.61:1 | AA | Lc 72.1 | Content text, not long reading |
| #637B64 text on black | 4.54:1 | AA | Lc -29.6 | 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
#F4F6F4
oklch(97.1% 0.003 145.5)
-
Step 100
100
#E7EBE7
oklch(93.6% 0.007 145.5)
-
Step 200
200
#D5DBD5
oklch(88.5% 0.01 145.5)
-
Step 300
300
#B9C4B9
oklch(80.9% 0.019 145.4)
-
Step 400
400
#94A695
oklch(70.6% 0.032 146.8)
-
Step 500
500
#7A917B
oklch(63.2% 0.042 146.2)
-
Step 600
600 (this color)
#637B64
oklch(55.7% 0.045 146)
-
Step 700
700
#526753
oklch(49% 0.04 146.2)
-
Step 800
800
#435444
oklch(42.6% 0.034 146.5)
-
Step 900
900
#394639
oklch(37.8% 0.028 145)
-
Step 950
950
#212921
oklch(27% 0.018 145)
#637B64 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) | #7C7663 | 0.037 |
| Deuteranopia (no green cones) | #787465 | 0.035 |
| Tritanopia (no blue cones) | #617A74 | 0.025 |
| Achromatopsia (no color) | #757575 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637B64
#637B64
oklch(55.7% 0.045 146)
- #826B82
#826B82
oklch(55.8% 0.045 326.2)
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 #637B64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sage #598556 ΔE 0.044
- Grey Brown #7F7053 ΔE 0.048
- Battleship Gray #6C757D ΔE 0.050
- Military Green #667C3E ΔE 0.052
- Slate Green #658D6D ΔE 0.052
- Battleship Grey #6B7C85 ΔE 0.053
- Medium Grey #7D7F7C ΔE 0.054
- Dim Gray #696969 ΔE 0.058
Use #637B64 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.