Comparison

Twilight Time vs SI Converter

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Twilight Time

Features
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Shows the time before sunrise and after sunset when the sun is below the horizon and it is bright outside (twilight). Twilight 1. Civil twilight 2. Nautical twilight 3. Astronomical twilight

About

SI Converter

Features
Read full description

SI Converter is allows you to easily convert unit following the global standard of measurement is the International System of Units (SI). The intent of this app is to provide a convenient way to convert between the various units of measurement within different systems, as well as to provide a basic understanding of the systems currently in use, and how they interact. Supported Units: Area: Square Megameters (Mm²) Square Kilometers (km²) Square Meters (m²) Square Centimeter (cm²) Square Millimeters (mm²) Square Micrometers (µm²) Square Nanometers (nm²) Square Inches (in²) Square Feet (ft²) Square Yards (yd²) Square Miles (mi²) Acres (acres) Ares (a) Hectares (ha) Lengh: Megameters (Mm) Kilometers (kM) Hectometers (hm) Decameters (dam) Meters (m) Decimeters (dm) Centimeters (cm) Millimeters (mm) Micrometers (µm) Nanometers (nm) Picometers (pm) Inches (in) Feet (ft) Yards (yd) Miles (mi) Scandinavian Miles (smi) Light Years (ly) Nautical Miles (NM) Fathoms (ftm) Furlongs (fur) Astronomical Units (ua) Parsecs (pc) Pressure: Newtons Per Meter Squared (Equivalent to Pascals) (N/m²) Gigapascals (GPa) Megapascals (MPa) Kilopascals (kPa) Hectopascals (hPa) Inches of Mercury (inHg) Bars (bar) Millibars (mbar) Millimeters of Mercury (mmHg) Pounds Per Square Inch (psi) Temperature: Kelvin (K) Degree Celsius (°C) Degree Fahrenheit (°F) volume: Megaliters (ML) Kiloliters (kL) Liters (L) Deciliters (dL) Centiliters (cL) Milliliters (mL) Cubic Kilometers (km³) Cubic Meters (m³) Cubic Decimeters (dm³) Cubic Millimeters (mm³) Cubic Inches (in³) Cubic Feet (ft³) Cubic Yards (yd³) Cubic Miles (mi³) Acre Foeet (af) Bushels (bsh) Teaspoons (tsp) Tablespoons (tbsp) Fluid Ounces (fl oz) Cups (cup) Pints (pt) Quarts (qt) Gallons (gal) Imperial Teaspoons (tsp) Imperial Tablespoons (tbsp) Imperial Fluid Ounces (fl oz) Imperial Pints (pt) Imperial Quarts (qt) Imperial Gallons (gal) Metric Cups (metric cup) Mass: Kilograms (kg) Grams (g) Decigrams (dg) Centigrams (cg) Milligrams (mg) Micrograms (µg) Nanograms (ng) Picograms (pg) Ounces (oz) Pounds (lb) Stones (st) Metric Tons (t) Short Tons (ton) Carats (ct) Ounces Troy (oz t) Slugs (slug) angle: Degrees (°) Arc Minutes Arc Seconds Radians (rad) Gradians (grad) Revolutions (rev) Speed: Meters Per Second (m/s) Kilometers Per Hour (km/h) Miles Per Hour (mph) Knots (kn) time: Hours (hr) Minutes (min) Seconds (sec) Milliseconds (ms) Microseconds (μs) Nanoseconds (ns) Picoseconds (ps)

Screenshots

Twilight Time1 screens
SI Converter4 screens

Verdict

The call

The clearest difference is update cadence: Twilight Time at every 2 weeks against SI Converter's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Twilight Time ships an update every 2 weeks, SI Converter every 2 months. The most recent releases landed on September 23, 2026 and May 16, 2026 respectively.

Scorecard1 real difference · 5 level
Twilight Time versus SI Converter: the parameters behind the verdict, then further details
ParameterTwilight TimeSI Converter
PriceFreeFree
Update frequencyEvery 2 weeks — betterEvery 2 months
AdsYesYes
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.7.10 — better17.2
Further details — not scored
Size36 MB4 MB
Age rating4+4+
DeveloperHideaki UchikoshiRamon A. Marchante Castellanos

In-app purchases

None

Twilight Time

No in-app purchases

None

SI Converter

No in-app purchases

Questions

Is Twilight Time free?
Twilight Time is free to download, with no in-app purchases.
Is SI Converter free?
SI Converter is free to download, with no in-app purchases.
Do Twilight Time or SI Converter have ads?
Both Twilight Time and SI Converter show ads.
Which is updated more often, Twilight Time or SI Converter?
Twilight Time ships an update every 2 weeks, and SI Converter every 2 months. Most recently, Twilight Time was updated on September 23, 2026 and SI Converter on May 16, 2026.

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