Slide Rule vs ReunionTouch
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Slide Rule
Simulates a mechanical analog computer for scientific and engineering calculations. Perform multiplication, division, roots, and trigonometric functions with a digital slide rule.
- Multiplication and division
- Square and cube roots
- Trigonometry functions
- Logarithm calculations
- Digital slide rule simulation
- Mechanical analog computer
Read full descriptionHide full description
This app is a slide rule simulator. The slide rule (a.k.a. slipstick) is an mechanical analog computer which was formerly used for various scientific calculations, engineering design and surveying. It consists of three linear strips and a sliding cursor and is used for multiplication, division, square, cube, square root, cubic root, trigonometry, logarithm and so on. Please note that trigonometry and logarithm are not supported and the width of the scale is 1,000 pixels in this version.
ReunionTouch
Access and manage your family tree data on your mobile device. Add new individuals, upload photos, document details, and make edits on the go. Changes automatically sync with the desktop version.
- View and navigate family trees
- Search family information
- Edit data on the go
- Add new people and pictures
- Automatic syncing with Reunion for Mac
- Supports iPhone and iPad screen sizes
Read full descriptionHide full description
ReunionTouch is a companion product to Reunion 14, 13, 12 or 11 for Mac. Take your family tree with you! View, navigate, search, and edit your information on the go. You'll always be ready to add people, add pictures, document new information, and make corrections to your data — all while automatically staying in sync with Reunion for Mac. If you have Reunion 13, you can use iCloud Drive or Dropbox to download and sync your family file with ReunionTouch. If you have Reunion 12 or 11, you can use Dropbox to download and sync your family file with ReunionTouch. ReunionTouch takes advantage of all iPhone and iPad screen sizes.
Screenshots
Verdict
The clearest difference is rating: ReunionTouch at 3.7 against Slide Rule's 1.0. ReunionTouch also leads on update cadence (every 2 months vs every 29 months) and ratings volume (57 vs 1). Slide Rule's advantage is price ($0.99 vs $9.99) and review sentiment (75% vs 45%). On 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
Slide Rule costs $0.99 and ReunionTouch $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
ReunionTouch holds the better App Store score, 3.7 against 1.0. That said, the two scores are not equally well evidenced: ReunionTouch has 57 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 75% of Slide Rule's written reviews are positive against 45% of ReunionTouch's, so the app with the better star average is not the one people write more warmly about.
Slide Rule ships an update every 29 months, ReunionTouch every 2 months. The most recent releases landed on October 18, 2026 and October 22, 2026 respectively.
| Parameter | Slide Rule | ReunionTouch |
|---|---|---|
| Price | $0.99 — better | $9.99 |
| Rating | 1.0 (1 ratings) | 3.7 (57 ratings) — better |
| Positive reviews | 75.0% of reviews — better | 45.3% of reviews |
| Number of ratings | 1 | 57 — better |
| Update frequency | Every 29 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Best chart rank | — | #152 — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 13.1 — better |
| Further details — not scored | ||
| Size | 3 MB | 48 MB |
| Age rating | 4+ | 4+ |
| Developer | Masayuki Akamatsu | Leister Productions, Inc |
Customer experience
Slide Rule
ReunionTouch
Bugs and requests
Slide Rule
Not enough reviews yet to summarise bugs or requests.
ReunionTouch
Reported bugs
7 issues- Reunion Touch pretends no people in file after upgrade
- Changes do not sync back to iPhone from iPad
- Cannot open Dropbox files
- App spins when trying to upload files
- Interface interferes with task switcher bar on iPad Pro
Show 2 moreShow fewer
- Large database causes long waiting times for searches
- Unable to access ReunionTouch on iPad after desktop upgrade
Requested features
13 requests- Add iCloud sync option
- Improve GEDCOM file upload process
- Make app more independent of Mac OS platform
- Build a new iOS app with all Mac version features
- Allow creation of family file directly on iPad
Show 8 moreShow fewer
- Improve search function speed
- Bring back manual sync option
- Provide option to not download images in Reunion Touch
- Allow switching between family trees
- Make the user interface more intuitive
- Improve synchronization between devices
- Add option for dark mode
- Make the app more useful and less bare bones
In-app purchases
Slide Rule
No in-app purchases
ReunionTouch
No in-app purchases
Questions
Is Slide Rule free?
Is ReunionTouch free?
Which has better reviews, Slide Rule or ReunionTouch?
Do Slide Rule or ReunionTouch have ads?
Which is updated more often, Slide Rule or ReunionTouch?
Other comparisons
