Comparison

SimTunnel Pro vs Collections Database

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

Head to head
About

SimTunnel Pro

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SimTunnel Pro is designed to perform a quick tunnel analysis on your phone device. SimTunnel Pro is very simple and easy to use. SimTunnel Pro uses "rock-support interaction" or "convergence-confinement" method to estimate the deformation of circular tunnels in weak rock, and visualizing the tunnel interaction with various support systems. SimTunnel Pro has the following features: - SimTunnel Pro determines Factor of Safety (FOS) as the ratio of maximum support pressure to the support pressure required for equilibrium. - The Tunnel and Rock Parameters dialog allows you to define the tunnel and rock properties for model. - The Strength Properties which are required will depend on the strength criteria you have selected in Setting Page. - Both Mohr-Coulomb and Hoek-Brown strength criteria are available. - The parameter calculator dialogs are available to help you to calculate some of the parameters (i.e. GSI, mi, D, UCS, insitu stress and etc). - The support parameters dialog allows you to easily add support and define the support properties for the model. - Three different support types can be added to the model: Rockbolts, Steelsets and Shotcrete - The ground reaction curve (GRC) is always displayed in the output page. - The brief summary of analysis results and input data will be displayed in the Output Page. - The report button, allows you to save the current model’s input and output information into PDF file. The generated report file can be sent out via email.

About

Collections Database

Organize anything with a personal database app. It offers over 20 field types, customizable layouts, and pre-built templates for common uses like books or expenses. Advanced features and iCloud sync are available.

Highlights
  • 20+ field types (text, number, picture, barcode, etc.)
  • Customizable fields and display styles
  • Pre-built templates (books, contacts, expenses, etc.)
  • Organize with collections and subcollections
  • Password, Face ID, and Touch ID protection
  • iCloud synchronization across devices
  • Advanced fields and calculations (Pro version)
Features
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Collections is a personal database app to organize anything. 1. A field for every use Collections supports over 20+ field types: • Text, Number • Boolean • Picture • Select • Email, URL, Phone • Password • Date, Time • Color • Barcode And with the Pro version you can use even more advanced fields. • Document reference - Link documents together • Group - Add multiple values for a field • Formula - Create a formula for calculated values. Powerful formula editor with full support to math functions like SUM, AVG • Sources - Import documents from external APIs with Javascript 2. Customizable • Add and reorder fields • Add a separator between fields to better visualize them • Fields have different display styles like primary, secondary, thumbnail • Filter and sort data 3. Templates Collections includes basic templates to get started: • Books • Contacts • Expenses • Subscriptions • Credentials • Inventory • School 5. Advanced management Collections has different tools to help you creating the data model. SUBCOLLECTIONS Organize data into collections and subcollections. Simply said, they are like folders. LISTS A list contains items used in documents and it's very flexible. It could represent a Genre for a book or a Status like 'Available', 'Out of stock' for an object in the inventory. 6. Security • Protect collections using a password, Face ID or Touch ID • Sensitive data such as passwords are encrypted by default 7. iCloud Sync Data is synced automatically between devices through iCloud. 8. Apple's Shortcuts support Expand the app capabilities with Apple's Shortcuts support. 9. Pro version features • Add unlimited documents (free version is limited to 100 documents) • Add files to documents • Add advanced fields • Views • Grid • Use Summary to perform calculations across documents

Screenshots

SimTunnel Pro4 screens
Collections Database4 screens

Verdict

The call

The clearest difference is price: Collections Database at Free against SimTunnel Pro's $1.99. Collections Database also leads on update cadence (fortnightly vs every 39 months) and device support (4 vs 2). SimTunnel Pro's advantage is in-app purchases (none vs 3). On ads 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

Collections Database is free to download; SimTunnel Pro costs $1.99 up front. Collections Database sells 3 one-off in-app purchases. SimTunnel Pro asks for nothing beyond the download.

UpkeepUpdate frequency

SimTunnel Pro ships an update every 39 months, Collections Database fortnightly. The most recent releases landed on October 3, 2026 and October 1, 2026 respectively.

Scorecard4 real differences · 6 level
SimTunnel Pro versus Collections Database: the parameters behind the verdict, then further details
ParameterSimTunnel ProCollections Database
Price$1.99Free — better
Rating—4.6 (187 ratings) — better
Positive reviews—87.1% of reviews
Number of ratings—187 — better
Update frequencyEvery 39 monthsFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod, Mac — better
Requires iOS15.615.0 — better
Further details — not scored
Size5 MB25 MB
Age rating4+4+
DeveloperRoozbeh Geraili MikolaMatteo D'Ignazio

Bugs and requests

SimTunnel Pro

Not enough reviews yet to summarise bugs or requests.

Collections Database

Reported bugs

2 issues
  • Keyboard issues when using search
  • Inconsistent behavior between iOS and macOS versions

Requested features

4 requests
  • Collaborative features for sharing databases
  • More advanced reporting and visualization options
  • Improved import/export functionality
  • Ability to customize the appearance and layout

In-app purchases

None

SimTunnel Pro

No in-app purchases

3 purchases

Collections Database

One-time3
  • Collections Ultra (Upgrade)$1.99
  • Collections Pro$7.99
  • Collections Ultra$9.99

Questions

Is SimTunnel Pro free?
SimTunnel Pro costs $1.99, with no in-app purchases.
Is Collections Database free?
Collections Database is free to download, with in-app purchases available.
Do SimTunnel Pro or Collections Database have ads?
Neither SimTunnel Pro nor Collections Database shows ads.
Which is updated more often, SimTunnel Pro or Collections Database?
SimTunnel Pro ships an update every 39 months, and Collections Database fortnightly. Most recently, SimTunnel Pro was updated on October 3, 2026 and Collections Database on October 1, 2026.

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