#243F45
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.9% 0.034 213.4), rgb(36, 63, 69).
Aa
White text reads best on this color (11.21:1).
About this color
#243F45 is a dark, muted teal or cyan. In OKLCH its lightness is 35%, its chroma 0.034 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.023 away. White text reads best on it, at 11.21:1.
| Hue family | Teals and cyans |
| Lightness | dark (35%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.87:1 |
| White text | 11.21:1 |
Values
| HEX | #243F45 |
| RGB | rgb(36, 63, 69) |
| HSL | hsl(191, 31%, 21%) |
| OKLCH | oklch(34.9% 0.034 213.4) |
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 #243F45 | 11.21:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #243F45 | 1.87:1 | Fails | Lc 8.0 | Not readable |
| #243F45 text on white | 11.21:1 | AAA | Lc 95.8 | Preferred for body text |
| #243F45 text on black | 1.87:1 | Fails | Lc 0.0 | Not readable |
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 900.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBED
oklch(93.6% 0.007 219.6)
-
Step 200
200
#CFDCDF
oklch(88.6% 0.015 213.1)
-
Step 300
300
#AFC5CB
oklch(80.9% 0.025 215.9)
-
Step 400
400
#84A8B0
oklch(70.8% 0.041 212.8)
-
Step 500
500
#63929D
oklch(63% 0.053 214)
-
Step 600
600
#497C88
oklch(55.5% 0.058 214.5)
-
Step 700
700
#3A6973
oklch(49.1% 0.054 212.9)
-
Step 800
800
#31555E
oklch(42.6% 0.044 215.5)
-
Step 900
900 (this color)
#243F45
oklch(34.9% 0.034 213.4)
-
Step 950
950
#1A292D
oklch(26.9% 0.022 216.2)
#243F45 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) | #3A3D45 | 0.031 |
| Deuteranopia (no green cones) | #353945 | 0.029 |
| Tritanopia (no blue cones) | #154241 | 0.020 |
| Achromatopsia (no color) | #3B3B3B | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243F45
#243F45
oklch(34.9% 0.034 213.4)
- #4B342E
#4B342E
oklch(35% 0.035 35.2)
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 #243F45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.023
- Onyx #343A40 ΔE 0.025
- Charcoal #264653 ΔE 0.029
- Midnight Green #073B4C ΔE 0.033
- Charcoal Grey #3C4142 ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.041
- Gunmetal #293241 ΔE 0.042
- Dark Teal #014D4E ΔE 0.046
Use #243F45 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.