Comparison

Underlist vs CostX

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

Head to head
About

Underlist

Create and manage lists for groceries, projects, goals, and more with this intuitive app. It leverages Apple technologies like Widgets and Shortcuts for seamless integration and offers robust security features like passcode locks.

Highlights
  • Create lists for various purposes
  • Utilizes Widgets and Shortcuts
  • iCloud synchronization
  • Share Extension for content import
  • Export and import lists
  • Passcode and biometric security
  • Multi-Window support on iPad
Read full description

Underlist is a simple list app made to be useful, where you can create lists for various purposes such as groceries, trips, project management, personal goals, to-dos, and more. It is designed to be intuitive and takes advantage of the latest Apple technologies such as Widgets, Shortcuts automation, iCloud synchronization, and much more. Main features: - Share Extension: Add content directly from other apps without the need to switch applications. For files, it will add the content in the record attachment, for rich content such as map place-marks it will parse and retrieve the information found and add it to the record notes. - Underlist files: You can export a list, share it through AirDrop, and the receiver can import it directly on his device. And if your list has a passcode it will be required to be inputted as well. - Multi-Window on iPad: To be productive you can have multiple windows with different lists and you can drag and drop content from one side to another. Quick, easy, and intuitive. And of course, you can have Underlist in split view or floating view with other applications. - Security:  You can set a passcode or biometric lock for your lists to open, edit, and share. Resuming on Underlist you will find: - Widgets (Small, Medium, and Large) with list selection. - iCloud sync across devices; - Shortcuts automation; - List files to export and import; - Drag and Drop; - Context Menus; - Notes with rich content detection; - Multi-Window support on iPad; - Dark and Light theme; - Alternative app icons; - Notification reminders; - Repeatable records; - Lists security; - Global search; - List Folders; - Separators on Lists; - Manual order; - Quick record creation; - Records attachments; - Attachment preview; On Underlist you will find two optional subscriptions available, one monthly and another yearly. These subscriptions unlock the ability to optionally disable the Third-Party Analytics and are present mostly to allow users to support the application. ALL APP FEATURES ARE AVAILABLE WITHOUT THE NEED TO SUBSCRIBE TO A PLAN. Privacy Policy: https://underlist.app/privacy-policy.html Terms of Use: https://underlist.app/terms.html

About

CostX

This app helps you break down and visualize projects, costs, and products. Create Work, Cost, and Product Breakdown Structures with customizable views and efficient data entry. Easily share and integrate information with other applications.

Highlights
  • Work, Cost, and Product Breakdown Structures (WBS, CBS, PBS)
  • Multiple views: graphical, list, columns
  • Intuitive data entry and manipulation
  • Drag-and-drop functionality
  • Copy and paste support
  • Customizable attribute fields
  • Efficient information sharing
Features
Read full description

Break down and visualize your work, costs and products. CostX helps you efficiently break down work, costs and products in your projects into manageable parts and automatically aggregate them from branch to trunk. CostX can be used to create Work Breakdown Structures (WBS), Cost Breakdown Structures (CBS) and Product Breakdown Structures (PBS) and is suitable for a wide range of applications thanks to its powerful customization capabilities. CostX makes it easy and convenient to break down objects to create tree structures and provides multiple forms of views to visualize your work. Thus, you have the freedom to display your project data in graphical, list and columns views, depending on your needs - CostX makes your work more efficient and intuitive. With carefully designed data entry, CostX gives you intuitive graphical manipulations, professional table manipulations, and familiar column manipulations in data entry to break down and create nodes, change attributes, and summarize costs. costX makes these tasks much easier than you might think, with minimal operating and learning costs. The application takes advantage of the powerful interactive capabilities offered by the system, helping you share information with the system and other applications extremely efficiently. By dragging and dropping, as well as copying and pasting, you can convert multiple lines of text into multiple nodes and build a tree structure in a single step, or create nodes with multiple information fields in bulk. In addition, you can batch copy data from multiple cells in Apple Number and MS Excel to the CostX spreadsheet. CostX’s customization options allow you to better adapt the program to your business needs and get creative. Users can customize the attribute fields they want, the display order, and how nodes are displayed in the various views as needed. More freedom leads to more usage scenarios. ## Ease of use - Multiple views for viewing and editing, you can choose the most suitable one for your needs. - Graphical view, allowing you to view and edit nodes in an intuitive way. - List view, with detailed data display and table editing that supports continuous input and switching and modifying cells. - Columns view, for convenient and familiar operation, similar to the columns view of the file application. - Property editor, maintenance of all properties of the node for changes. - Convenient operation of adding, duplicating, folding and indenting. ## Efficient - Powerful drag-and-drop support for: - Move and copy nodes within a document. - Merge costs within a document. - Drop CostX files into a node to insert its contents. - Drag images from Files app, Photos app, and Web browser. - Powerful copy and paste support. - Copy and paste within a document and between multiple documents. - Nodes - Cells - Copy text from outside: - Single-line text to create a new node. - Multiline text to create multiple nodes in series and get tree structure information. - Modify cell contents. - Copy data from Apple Number and Microsoft Excel: - Change cell contents in batch at once. - Batch add nodes with multiple fields at once. ## Customization - Base currency, cost rate and category settings. - More than fifty fields to choose from, including category, photo, simple and compound cost, text, date, percentage complete, etc. Costs can also be divided into two groups for comparison purposes. - Field settings. - Visibility in each view and in the property editor. - Field display title. - Field display width in the list view. - Field display order. - Display style of nodes in graphical view and columns view. - Use any CostX document as a template. ## Import & Export - Export the selected node as a CostX file. - SwiftApps WBS file into a CostX document. - CSV export. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Underlist4 screens
CostX4 screens

Verdict

The call

The clearest difference is review sentiment: CostX at 100% against Underlist's 33%. CostX also leads on rating (4.5 vs 4.3). Underlist's advantage is monetization model (free vs free with in-app purchases) and iOS requirement (14.0 vs 16.0). On price, ratings volume, update cadence and ads 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

Both are free to download. Underlist sells 5 in-app purchases, starting at $0.99 per month and CostX sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

CostX holds the better App Store score, 4.5 against 4.3. Both are backed by a comparable volume of ratings — 7 and 8 respectively. Written reviews point the same way: 33% of Underlist's written reviews are positive against 100% of CostX's.

UpkeepUpdate frequency

Underlist ships an update monthly, CostX every 4 weeks. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
Underlist versus CostX: the parameters behind the verdict, then further details
ParameterUnderlistCostX
PriceFreeFree
Rating4.3 (7 ratings)4.5 (8 ratings) — better
Positive reviews33.3% of reviews100.0% of reviews — better
Number of ratings78 — better
Update frequencyMonthlyEvery 4 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, Mac
Requires iOS14.0 — better16.0
Further details — not scored
Size10 MB14 MB
Age rating4+4+
DeveloperFilipe Martins皓 李

Customer experience

Underlist

All ratings7 ratings
Positive71.4%
Neutral14.3%
Negative14.3%
Written reviews6 reviews
Positive33.3%
Neutral33.3%
Negative33.3%

CostX

All ratings8 ratings
Positive87.5%
Neutral0.0%
Negative12.5%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

5 purchases

Underlist

Subscriptions2
  • Monthly Supporter$0.991 Month
  • Yearly Supporter$4.991 Year
One-time3
  • Coffe-Sized Tip$0.99
  • Snack-Sized Tip$2.99
  • Lunch-Sized Tip$5.99
2 purchases

CostX

Subscriptions2
  • Monthly$1.991 Month
  • Yearly$17.991 Year

Questions

Is Underlist free?
Underlist is free to download, with in-app purchases available.
Is CostX free?
CostX is free to download, with in-app purchases available.
Which has better reviews, Underlist or CostX?
CostX is rated higher. Underlist averages 4.3 out of 5 from 7 ratings, while CostX averages 4.5 from 8 ratings.
Do Underlist or CostX have ads?
Neither Underlist nor CostX shows ads.
Which is updated more often, Underlist or CostX?
Underlist ships an update monthly, and CostX every 4 weeks. Most recently, Underlist was updated on October 23, 2026 and CostX on October 24, 2026.

Other comparisons