Comparison

Sputnik! vs Chess Clock App

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

Head to head
About

Sputnik!

Track the International Space Station and bright satellites with precise timing and location data. Get second-by-second countdowns, set reminders, and view satellite paths in the night sky. Supports offline calculations and sharing sightings.

Highlights
  • Accurate satellite and ISS sighting predictions
  • Starlink satellite train detection
  • Second-by-second countdowns
  • Sighting reminders
  • Compass direction and elevation display
  • Night sky path visualization
  • Offline calculations
Features
Read full description

Sputnik! is an easy to use tool for predicting when the International Space Station will pass by your location or when a bright satellite will be visible in the skies above. Sputnik! features: - Predictions of satellite and ISS sightings accurate to the second. - Detection of Starlink satellite trains. - Second by second countdown to the satellite sighting. - Set reminders of upcoming satellite sightings. - Displays compass direction and elevation for your device to easily find the part of the sky where the sighting will occur (requires capable device). - Rotate your device to landscape orientation to show exactly where the satellite will pass in the night sky. - Share sightings via Twitter, Facebook, Mail, Messages and others. - Automatic download of up to date satellite orbital data. - Offline calculations, no need to be connected to the internet once orbital data has been downloaded. - Input your location automatically by GPS, select from a map or enter coordinates manually. - Save your favorite places for easy access. - Audio cues for the last seconds before the satellite passes by. Sputnik! on Apple Watch: - Easily find the next and last sighting at your current location. * Sputnik! is ad-supported *

About

Chess Clock App

This application functions as a dual-clock timer for two players, ideal for games like chess. It precisely tracks each player's move time, ensuring fair play and preventing excessive delays. The timer can count down or up, and features a pause function for both players.

Highlights
  • Dual-player time tracking
  • Count down or count up timer
  • Pause functionality
  • Background operation
  • Individual time settings
Features
Read full description

A chess clock consists of two connected clocks which can't run at the same time. Use it as a game clock to measure the time used by two players for their moves e.g. in game of chess. Stopping one clock will start the other one. The purpose is to keep track of the total time each player takes for his or her own moves, and ensure that neither player overly delays the game. Features: - choose the same time for both players or individually - count the time down or up - pause the clock for both players - runs in the background while the app is closed - support for the iPhone 6 and 6+

Screenshots

Sputnik!4 screens
Chess Clock App4 screens

Verdict

The call

The clearest difference is review sentiment: Sputnik! at 92% against Chess Clock App's 0%. Sputnik! also leads on price (Free vs $0.99) and rating (4.7 vs 1.0). Chess Clock App's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement 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

Sputnik! is free to download; Chess Clock App costs $0.99 up front. Sputnik! sells 1 one-off in-app purchase. Chess Clock App asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Sputnik! holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Sputnik! has 731 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 92% of Sputnik!'s written reviews are positive against 0% of Chess Clock App's.

UpkeepUpdate frequency

Sputnik! ships an update every 5 months, Chess Clock App every 11 months. The most recent releases landed on October 2, 2026 and September 16, 2026 respectively.

Scorecard7 real differences · 3 level
Sputnik! versus Chess Clock App: the parameters behind the verdict, then further details
ParameterSputnik!Chess Clock App
PriceFree — better$0.99
Rating4.7 (731 ratings) — better1.0 (1 ratings)
Positive reviews92.2% of reviews — better0.0% of reviews
Number of ratings731 — better1
Update frequencyEvery 5 months — betterEvery 11 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationAd-supported — betterPaid
DevicesiPhone, iPod, Apple WatchiPhone, iPad, iPod
Requires iOS14.0 — better15.6
Further details — not scored
Size35 MB19 MB
Age rating4+4+
DeveloperApplicate LtdPiet Jonas

Customer experience

Sputnik!

All ratings731 ratings
Positive94.8%
Neutral2.6%
Negative2.6%
Written reviews243 reviews
Positive92.2%
Neutral1.2%
Negative6.6%

Chess Clock App

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

Sputnik!

Reported bugs

3 issues
  • App reporting 'No Sightings' for all categories
  • Null check errors when selecting satellite sightings
  • Issues with location settings and data updates

Requested features

4 requests
  • Add support for more satellite types
  • Improve sky chart visualization and orientation
  • Provide filtering options (e.g. by elevation, magnitude)
  • Implement automatic data updates

Chess Clock App

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Sputnik!

One-time1
  • Go ad-free$0.99
None

Chess Clock App

No in-app purchases

Questions

Is Sputnik! free?
Sputnik! is free to download, with in-app purchases available.
Is Chess Clock App free?
Chess Clock App costs $0.99, with no in-app purchases.
Which has better reviews, Sputnik! or Chess Clock App?
Sputnik! is rated higher. Sputnik! averages 4.7 out of 5 from 731 ratings, while Chess Clock App averages 1.0 from 1 ratings.
Do Sputnik! or Chess Clock App have ads?
Neither Sputnik! nor Chess Clock App shows ads.
Which is updated more often, Sputnik! or Chess Clock App?
Sputnik! ships an update every 5 months, and Chess Clock App every 11 months. Most recently, Sputnik! was updated on October 2, 2026 and Chess Clock App on September 16, 2026.

Other comparisons