SlipStick vs Asteroid Close Approach
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SlipStick
This app is a fully functional digital reproduction of a classic engineering slide rule. It allows users to perform complex calculations like multiplication, division, logarithms, and trigonometry, just like the original manual tool.
- Virtual slide rule reproduction
- Multiplication and division
- Logarithm calculations
- Trigonometry calculations
- Classic engineering tool
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A reproduction of a classic engineering tool - the slide rule. This fully functional manual calculating device was the engineer and math student's means of quickly solving multiplication, division, logarithm and trigonometry calculations until the invention and wide spread use of electronic calculators.
Asteroid Close Approach
Get real-time updates on near-Earth asteroid close approaches, including dates, distances, and impact energies. Access NASA's Sentry database for collision predictions and use a built-in calculator to estimate asteroid mass and energy.
- Real-time asteroid data on Apple Watch
- Comprehensive approach details
- Access to NASA's Sentry database
- Asteroid mass and energy calculator
- Collision monitoring for the next century
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Stay informed about the most recent near-Earth asteroid encounters—right from your iPhone or on your Apple Watch. Easily check the upcoming dates and times of close approaches, along with their distances, velocities, magnitudes, and estimated impact energies in kilotons. Dive into NASA’s Sentry database, a powerful collision monitoring system that continuously scans the latest asteroid catalog for any potential impacts within the next 100 years. Curious about an asteroid’s mass and energy? Use the built-in calculator to estimate these figures based on its absolute magnitude and approach speed. Features: • Latest Encounters on Your Wrist: View real-time asteroid data at a glance on your Apple Watch. • Comprehensive Tracking: Check each asteroid’s approach date, distance, velocity, magnitude, and potential impact energy. • Sentry Database Access: Keep tabs on NASA’s up-to-date collision predictions for the next century. • Asteroid Mass & Energy Calculator: Estimate physical properties and potential impact energy with a simple input of magnitude and speed. Stay informed, prepared, and captivated by the wonders of our cosmic neighborhood—anytime, anywhere.
Screenshots
Verdict
The clearest difference is review sentiment: SlipStick at 83% against Asteroid Close Approach's 0%. SlipStick also leads on update cadence (weekly vs every 4 weeks) and chart position (#130 vs unranked). On ads, in-app purchases, monetization model 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
SlipStick costs $0.99 and Asteroid Close Approach $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SlipStick ships an update weekly, Asteroid Close Approach every 4 weeks. The most recent releases landed on October 25, 2026 and October 9, 2026 respectively.
| Parameter | SlipStick | Asteroid Close Approach |
|---|---|---|
| Price | $0.99 — better | $1.99 |
| Rating | 4.6 (9 ratings) — better | — |
| Positive reviews | 83.3% of reviews — better | 0.0% of reviews |
| Number of ratings | 9 — better | — |
| Update frequency | Weekly — better | Every 4 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Best chart rank | #130 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Requires iOS | 12.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 1 MB | 34 MB |
| Age rating | 4+ | 4+ |
| Developer | Steve Glenner | Arpacore B.V. |
Customer experience
SlipStick
Asteroid Close Approach
In-app purchases
SlipStick
No in-app purchases
Asteroid Close Approach
No in-app purchases
Questions
Is SlipStick free?
Is Asteroid Close Approach free?
Do SlipStick or Asteroid Close Approach have ads?
Which is updated more often, SlipStick or Asteroid Close Approach?
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