CostWatt vs Calo
Price, ratings, monetisation and update history for both apps, side by side — 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.
Calo
This free calculator app offers a clean interface with instant launch and a history feature to view past calculations. It includes customizable themes, keypress sounds, and real-time result display for a smooth user experience.
- Calculation history
- Segmented input method
- iPad split-screen support
- Customizable themes and sounds
- Real-time result display
- Undo and delete functions
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Calo is a free, ad-free calculator for everyday math and deeper exploration. A clean keypad keeps quick calculations simple; switch to scientific mode when you need more. Calculate with confidence • A native high-precision engine keeps up to 40 significant digits in results. • See results as you type. Move the cursor to edit or paste an expression, and use a hardware keyboard on iPad. • Explore powers, roots, logarithms, trigonometry, factorials and more. Switch between degrees and radians. • Tap a result to cycle through rounded, full-precision, fraction (when available) and scientific formats. Use memory keys for multi-step work. Keep your work close • Search your calculation history, add notes, reuse an earlier expression, or export results as CSV or a receipt-style image. • Save expressions you use often and insert them with a tap. • See recent results in Home Screen and Lock Screen widgets. Open Calo from Control Center, or calculate and retrieve your latest result with Siri and Shortcuts. Make it yours with light and dark themes, accent colors, sounds, Chinese voice pronunciation, adjustable decimal places and optional iCloud sync.
Screenshots
Verdict
The clearest difference is price: Calo at Free against CostWatt's $0.99. Calo also leads on update cadence (every 5 days vs every 11 months) and device support. On in-app purchases and iOS requirement 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
Calo 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, Calo every 5 days. The most recent releases landed on October 14, 2026 and October 28, 2026 respectively.
| Parameter | CostWatt | Calo |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | — | 4.7 (20 ratings) — better |
| Positive reviews | — | 94.4% of reviews |
| Number of ratings | — | 20 — better |
| Update frequency | Every 11 months | Every 5 days — better |
| Ads | — | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | — | iPhone, iPad — better |
| Requires iOS | 17.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Rick Twilling | Space-Time Transformation Technology Co., Ltd. |
In-app purchases
CostWatt
No in-app purchases
Calo
No in-app purchases








