Comparison

SkySafari 7 Pro vs Thread Length Calculator

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

Head to head
About

SkySafari 7 Pro

Explore the night sky with an extensive astronomy database and advanced planning tools. Discover astronomical events, control your telescope, and connect with other stargazers in real-time.

Highlights
  • Extensive celestial object database
  • Advanced event finder
  • Telescope control (ASCOM Alpaca, INDI, StarSense)
  • Real-time social stargazing (OneSky)
  • Guided sky tours (SkyCast)
  • Observation planning and logging
  • Home and lock screen widgets
Features
Read full description

SkySafari makes stargazing a simple pleasure. It has the largest database of any astronomy app, includes every comet, asteroid, satellite & solar system object ever discovered, offers unparalleled accuracy, advanced planning and logging tools, flawless telescope control, and provides the very best experience under the stars when you depend on it. Don’t postpone joy. Discover why SkySafari is the #1 recommended astronomy app for serious amateur astronomers since 2009. Here's what’s new in version 7: + Complete support for iOS 18 and iPhone 16. Version 7 brings a new and immersive stargazing experience. + Events Finder - go to the new Events section to unlock a powerful search engine that finds astronomical events visible tonight and far into the future. The finder dynamically generates a listing of moon phases, eclipses, planetary moon events, meteor showers and planetary phenomenon such as conjunctions, elongations and oppositions. + Notifications - the notifications section has been completely revamped to allow you to customize and manage which events trigger an alert notification on your device. + Telescope Support - telescope control is at the heart of SkySafari. Version 7 takes a giant leap forward by supporting ASCOM Alpaca, INDI & StarSense Explorer. These next generation control protocols allow you to effortlessly connect to hundreds of compatible astronomical devices. SkySafari 7 brings social stargazing to mobile devices with two new features to help you connect with other like minded people. OneSky - allows you to see what other users are observing, in real time. This feature highlights objects in the sky chart and indicates with a number how many users are observing a particular object. SkyCast - allows you to guide a friend or group around the night sky through their own copy of SkySafari. After initiating SkyCast, you can generate a link and conveniently share it with other SkySafari users via text message, apps or social media accounts. + Sky Tonight - jump to the new Tonight section to see what’s visible in your sky tonight. Expanded information has been designed to help plan your night and includes Moon & Sun info, calendar curations, events and the best positioned deep sky and solar system objects. + Improved Observation Tools - SkySafari is the perfect tool to help you plan, record and organize your observations. New workflows make it easier to add, search, filter and sort data. + Home Screen and Lock Screen Widgets keep your favorite astro information at your fingertips. The Small Touches: + You can now edit the Jupiter GRS Longitude Value in the Settings. + Better Moon Age calculation. + New grid & reference options allow you to display Solstice and Equinox markers, Orbit + Node markers for all solar system objects, and tick marks and labels for the Ecliptic, Meridian, and Equator reference lines. + Previous In-app Purchases are Now Free - this includes the H-R diagram, 3D Galaxy view, and the PGC galaxy and GAIA star catalogs. Enjoy. + Many more. If you haven't used SkySafari 7 Pro before, here's what you can do with it: + Hold your device up, and SkySafari 7 Pro will find stars, constellations, planets, and more! + Simulate the night sky up to 5MM years in the past or future! Animate meteor showers, conjunctions, eclipses, and other celestial events. + Control your telescope, log and plan your observations. + Optionally backup all of your observing data in our secure cloud storage and make it easily accessible to multiple devices as well as from our new web interface, LiveSky.com. + Augmented Reality (AR) mode + Night Vision. + Orbit Mode. Leave the Earth’s surface behind, and fly through our solar system. + Galaxy View shows the position of deep sky objects in our Milky Way! https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ https://www.livesky.com/privacy.html

About

Thread Length Calculator

This free tool helps leatherworkers accurately calculate the thread length required for their projects. It accounts for the number of holes, stitching length, and leather thickness, ensuring you always have enough material.

Highlights
  • Thread length calculation
  • Supports any number of holes
  • Accounts for stitching length
  • Considers leather thickness
  • Free to use
Features
Read full description

Never be caught short again! Thread length calculator for All Leatherworkers! A Free and simple way to calculate the thread length needed for any number of holes, length of stitching or thickness of leather. No In App Purchases

Screenshots

SkySafari 7 Pro4 screens
Thread Length Calculator4 screens

Verdict

The call

The clearest difference is review sentiment: Thread Length Calculator at 100% against SkySafari 7 Pro's 46%. Thread Length Calculator also leads on price (Free vs $17.99) and in-app purchases (none vs 5). SkySafari 7 Pro's advantage is ratings volume (5.5K vs 3). 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

Thread Length Calculator is free to download; SkySafari 7 Pro costs $17.99 up front. SkySafari 7 Pro sells 5 in-app purchases, starting at $4.99 per month. Thread Length Calculator asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Thread Length Calculator holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: SkySafari 7 Pro has 5.5K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 46% of SkySafari 7 Pro's written reviews are positive against 100% of Thread Length Calculator's.

UpkeepUpdate frequency

SkySafari 7 Pro ships an update every 5 weeks, Thread Length Calculator every 10 days. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

Scorecard7 real differences · 3 level
SkySafari 7 Pro versus Thread Length Calculator: the parameters behind the verdict, then further details
ParameterSkySafari 7 ProThread Length Calculator
Price$17.99Free — better
Rating4.6 (5.5K ratings)5.0 (3 ratings) — better
Positive reviews45.8% of reviews100.0% of reviews — better
Number of ratings5.5K — better3
Update frequencyEvery 5 weeksEvery 10 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.113.0 — better
Further details — not scored
Size2.4 GB11 MB
Age rating4+4+
DeveloperSimulation Curriculum Corp.Nigel Armitage

Customer experience

SkySafari 7 Pro

All ratings5,434 ratings
Positive91.4%
Neutral2.6%
Negative5.9%
Written reviews360 reviews
Positive45.8%
Neutral14.4%
Negative39.7%

Thread Length Calculator

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

SkySafari 7 Pro

Reported bugs

5 issues
  • Free database downloads fail to complete
  • Telescope button crashes the app
  • Time settings spontaneously reset
  • Observing list crashes the app
  • Field of view indicators not working

Requested features

5 requests
  • Add ability to quickly edit light form
  • Allow custom horizon mask input
  • Include surface brightness data for extended objects
  • Add transit altitude information for objects
  • Improve object search with fuzzy matching

Thread Length Calculator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

5 purchases

SkySafari 7 Pro

Subscriptions2
  • SkySafari Premium Monthly7 Days trial$4.991 Month
  • SkySafari Premium7 Days trial$39.991 Year
One-time3
  • PGC Galaxy DatabaseFree
  • GAIA Star DatabaseFree
  • Apollo Lunar MissionsFree
None

Thread Length Calculator

No in-app purchases

Questions

Is SkySafari 7 Pro free?
SkySafari 7 Pro costs $17.99, and also offers in-app purchases.
Is Thread Length Calculator free?
Thread Length Calculator is free to download, with no in-app purchases.
Which has better reviews, SkySafari 7 Pro or Thread Length Calculator?
Thread Length Calculator is rated higher. SkySafari 7 Pro averages 4.6 out of 5 from 5.5K ratings, while Thread Length Calculator averages 5.0 from 3 ratings.
Do SkySafari 7 Pro or Thread Length Calculator have ads?
Neither SkySafari 7 Pro nor Thread Length Calculator shows ads.
Which is updated more often, SkySafari 7 Pro or Thread Length Calculator?
SkySafari 7 Pro ships an update every 5 weeks, and Thread Length Calculator every 10 days. Most recently, SkySafari 7 Pro was updated on November 7, 2026 and Thread Length Calculator on November 3, 2026.

Other comparisons