# CostX vs c.Notes

The clearest difference is review sentiment: CostX at 100% against c.Notes's 50%. CostX also leads on price (Free vs $4.99) and rating (4.5 vs 4.0). c.Notes's advantage is in-app purchases (none vs 2). On update cadence, ads and device support there is nothing between them.

CostX is free to download; c.Notes costs $4.99 up front. CostX sells 2 in-app purchases, starting at $1.99 per month. c.Notes asks for nothing beyond the download.

CostX holds the better App Store score, 4.5 against 4.0. Both are backed by a comparable volume of ratings — 8 and 2 respectively. Written reviews point the same way: 100% of CostX's written reviews are positive against 50% of c.Notes's.

CostX ships an update every 4 weeks, c.Notes monthly. The most recent releases landed on September 30, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | CostX | c.Notes |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.5 (8 ratings)](https://appshunter.io/ios/app/costx-work-and-cost-estimate/id1645196187/reviews)** | [4.0 (2 ratings)](https://appshunter.io/ios/app/cnotes/id6748303281/reviews) |
| Number of ratings | **8** | 2 |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Monthly |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 14 MB | 2 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [皓 李](https://appshunter.io/developer/621375881) | [subnetz.computing](https://appshunter.io/developer/1825076515) |

## What reviewers say

### 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 |


### c.Notes

[App page](https://appshunter.io/ios/app/cnotes/id6748303281)

A CalDAV client for synchronizing notes across devices using the iCalendar VJournal format. Keep your notes on the same servers as your calendar events and contacts.

**Highlights:** CalDAV synchronization, Cross-platform compatibility, iCalendar VJournal format, Notes, calendar, and contact integration, Server-side note storage

**In-app purchases:** none


## Frequently asked questions

### Is CostX free?

CostX is free to download, with in-app purchases available.

### Is c.Notes free?

c.Notes costs $4.99, with no in-app purchases.

### Which has better reviews, CostX or c.Notes?

CostX is rated higher. CostX averages 4.5 out of 5 from 8 ratings, while c.Notes averages 4.0 from 2 ratings.

### Do CostX or c.Notes have ads?

Neither CostX nor c.Notes shows ads.

### Which is updated more often, CostX or c.Notes?

CostX ships an update every 4 weeks, and c.Notes monthly. Most recently, CostX was updated on September 30, 2026 and c.Notes on October 11, 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.*