# Underlist vs CostX

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.

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.

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.

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

## The numbers

| Metric | Underlist | CostX |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (7 ratings)](https://appshunter.io/ios/app/underlist/id821552799/reviews) | **[4.5 (8 ratings)](https://appshunter.io/ios/app/costx-work-and-cost-estimate/id1645196187/reviews)** |
| Number of ratings | 7 | **8** |
| Positive reviews | 33.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 10 MB | 14 MB |
| Requires iOS | **14.0** | 16.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Filipe Martins](https://appshunter.io/developer/813989584) | [皓 李](https://appshunter.io/developer/621375881) |

## What reviewers say

### Underlist

[App page](https://appshunter.io/ios/app/underlist/id821552799)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Supporter | $0.99 | per month |
| Yearly Supporter | $4.99 | per year |
| Coffe-Sized Tip | $0.99 | one-time |
| Snack-Sized Tip | $2.99 | one-time |
| Lunch-Sized Tip | $5.99 | one-time |


### CostX

[App page](https://appshunter.io/ios/app/costx-work-and-cost-estimate/id1645196187)

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:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Yearly | $17.99 | per year |


## Frequently asked 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.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*