Comparison

CostWatt vs Expense Diary

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

Head to head
About

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.

About

Expense Diary

Features
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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

CostWatt4 screens
Expense Diary4 screens

Verdict

The call

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences ยท 2 level
CostWatt versus Expense Diary: the parameters behind the verdict, then further details
ParameterCostWattExpense Diary
Price$0.99Free โ€” better
Update frequencyEvery 11 monthsEvery 4 days โ€” better
Adsโ€”No
In-app purchasesNoNo
Devicesโ€”iPhone, iPad โ€” better
Requires iOS17.0 โ€” better26.0
Further details โ€” not scored
Size3 MB19 MB
Age rating4+12+
DeveloperRick TwillingJohn Paul Soriano

In-app purchases

None

CostWatt

No in-app purchases

None

Expense Diary

No in-app purchases

Questions

Is CostWatt free?
CostWatt costs $0.99, with no in-app purchases.
Is Expense Diary free?
Expense Diary is free to download, with no in-app purchases.
Which is updated more often, CostWatt or Expense Diary?
CostWatt ships an update every 11 months, and Expense Diary every 4 days. Most recently, CostWatt was updated on October 14, 2026 and Expense Diary on October 12, 2026.

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