#1F99DD
Closest named color: Dark Sky Blue (#448EE4). oklch(65.2% 0.142 240.4), rgb(31, 153, 221).
Aa
Black text reads best on this color (6.65:1).
About this color
#1F99DD is a medium-light, vivid blue. In OKLCH its lightness is 65%, its chroma 0.142 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.037 away. Black text reads best on it, at 6.65:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.65:1 |
| White text | 3.15:1 |
Values
| HEX | #1F99DD |
| RGB | rgb(31, 153, 221) |
| HSL | hsl(201, 75%, 49%) |
| OKLCH | oklch(65.2% 0.142 240.4) |
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 #1F99DD | 3.15:1 | AA large text | Lc -63.5 | Content text, not long reading |
| Black text on #1F99DD | 6.65:1 | AA | Lc 45.9 | Large or bold text, headings |
| #1F99DD text on white | 3.15:1 | AA large text | Lc 58.1 | Large or bold text, headings |
| #1F99DD text on black | 6.65:1 | AA | Lc -43.6 | 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 500.
-
Step 50
50
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DEECF6
oklch(93.6% 0.02 238.7)
-
Step 200
200
#C3DDF1
oklch(88.5% 0.039 241.1)
-
Step 300
300
#98C7E9
oklch(80.8% 0.069 240.1)
-
Step 400
400
#5AA9DF
oklch(70.7% 0.111 240.7)
-
Step 500
500 (this color)
#1F99DD
oklch(65.2% 0.142 240.4)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#00466B
oklch(37.7% 0.087 240.8)
-
Step 950
950
#032940
oklch(26.9% 0.059 241)
#1F99DD 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) | #789AE0 | 0.071 |
| Deuteranopia (no green cones) | #5F8ADC | 0.055 |
| Tritanopia (no blue cones) | #00AAB1 | 0.094 |
| Achromatopsia (no color) | #919191 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F99DD
#1F99DD
oklch(65.2% 0.142 240.4)
- #CD781F
#CD781F
oklch(65.2% 0.142 60.4)
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 #1F99DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.037
- Chefchaouen Blue #4895EF ΔE 0.039
- Water Blue #0E87CC ΔE 0.054
- Cornflower Blue #6495ED ΔE 0.056
- Dodger Blue #1E90FF ΔE 0.061
- Faded Blue #658CBB ΔE 0.067
- Soft Blue #6488EA ΔE 0.069
- Cool Blue #4984B8 ΔE 0.071
Use #1F99DD 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.