CostWatt vs Expense Diary
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
CostWatt
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CostWatt: Track and Calculate Your Power Usage CostWatt is a simple and effective tool designed to help you monitor and manage your electricity consumption. By manually entering your usage, the app calculates your power costs and saves this information to help you keep track over time. How it Works: - Enter Your Usage: Easily input your electricity usage to get an immediate cost calculation based on your energy rate. - Cost Calculation: CostWatt provides a straightforward calculation of your energy consumption costs, helping you understand your electricity spending. - Track Over Time: Your usage and cost data is saved, making it easy to monitor patterns, compare time periods, and get a clearer picture of how your energy consumption impacts your expenses. CostWatt offers an efficient way to stay informed about your power usage without any complicated features. It's designed for anyone looking to keep a closer eye on their electricity costs, whether for home or small business use.
Expense Diary
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Expense Diary is a simple expense tracker that helps you log daily spending, organize expenses by category, and review where your money goes. Add expenses in seconds, check summaries, view spending insights, and get reminders at the end of the day so you do not forget to record your expenses.
Screenshots
Verdict
The clearest difference is price: Expense Diary at Free against CostWatt's $0.99. Expense Diary also leads on update cadence (every 4 days vs every 11 months) and device support. CostWatt's advantage is iOS requirement (17.0 vs 26.0). On in-app purchases there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Expense Diary is free to download; CostWatt costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
CostWatt ships an update every 11 months, Expense Diary every 4 days. The most recent releases landed on October 14, 2026 and October 12, 2026 respectively.
| Parameter | CostWatt | Expense Diary |
|---|---|---|
| Price | $0.99 | Free โ better |
| Update frequency | Every 11 months | Every 4 days โ better |
| Ads | โ | No |
| In-app purchases | No | No |
| Devices | โ | iPhone, iPad โ better |
| Requires iOS | 17.0 โ better | 26.0 |
| Further details โ not scored | ||
| Size | 3 MB | 19 MB |
| Age rating | 4+ | 12+ |
| Developer | Rick Twilling | John Paul Soriano |
In-app purchases
CostWatt
No in-app purchases
Expense Diary
No in-app purchases









