#1F516F
Closest named color: Deep Sea Blue (#015482). oklch(41.6% 0.073 238.5), rgb(31, 81, 111).
Aa
White text reads best on this color (8.52:1).
About this color
#1F516F is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.073 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.032 away. White text reads best on it, at 8.52:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.46:1 |
| White text | 8.52:1 |
Values
| HEX | #1F516F |
| RGB | rgb(31, 81, 111) |
| HSL | hsl(203, 56%, 28%) |
| OKLCH | oklch(41.6% 0.073 238.5) |
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 #1F516F | 8.52:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #1F516F | 2.46:1 | Fails | Lc 14.9 | Not readable |
| #1F516F text on white | 8.52:1 | AAA | Lc 89.1 | Fine for body text |
| #1F516F text on black | 2.46:1 | Fails | Lc -13.1 | 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 800.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CBDCE7
oklch(88.5% 0.024 236)
-
Step 300
300
#A8C5DA
oklch(80.9% 0.043 239.6)
-
Step 400
400
#78A7C7
oklch(70.7% 0.069 238.8)
-
Step 500
500
#5491B8
oklch(63.1% 0.087 238.3)
-
Step 600
600
#367BA4
oklch(55.7% 0.094 237.9)
-
Step 700
700
#27678D
oklch(49.1% 0.089 238.5)
-
Step 800
800 (this color)
#1F516F
oklch(41.6% 0.073 238.5)
-
Step 900
900
#22465C
oklch(37.8% 0.056 237.6)
-
Step 950
950
#152936
oklch(27% 0.036 238.5)
#1F516F 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) | #435170 | 0.040 |
| Deuteranopia (no green cones) | #38496E | 0.033 |
| Tritanopia (no blue cones) | #00595B | 0.051 |
| Achromatopsia (no color) | #4C4C4C | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F516F
#1F516F
oklch(41.6% 0.073 238.5)
- #694120
#694120
oklch(41.5% 0.073 58.3)
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 #1F516F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.032
- Light Navy #155084 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.042
- Deep Teal #00555A ΔE 0.046
- Petrol #005F6A ΔE 0.048
- Light Navy Blue #2E5A88 ΔE 0.050
- YInMn Blue #415A77 ΔE 0.050
- Dusk Blue #26538D ΔE 0.051
Use #1F516F 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.