Delta Calc vs Note by Xi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Delta Calc
Quickly calculate percent changes, discounts, and financial gains without complex math. Solve for any of the three values in the percent change formula with an intuitive interface and fun animations.
- Calculate percent changes
- Solve for any variable in the formula
- Customizable decimal places
- Haptic feedback
- Fun animations
- Adjustable keyboard buttons
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A fast, easy, and fun-to-use percent change calculator. Now you can quickly calculate discounts, financial gains, and percent changes without having to use Excel, Google, or do the long math. Delta Calc can solve for any of the three values within the percent change formula. It solves for the a, b, or c value in the percent change formula ((b - a) / a) * 100 = c. Other features include: - Haptic feedback (can be disabled if desired) - Change the number of decimal places displayed in the result (from 0 to 10) - Fun animation when tapping the swap button (warning: could become addictive) - Delightful to tap number pad buttons - Enable and disable keyboard buttons Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://deltacalc.app/privacy Support: https://deltacalc.app/support
Note by Xi
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NOTE by Xi is an amazing note app ：D
Screenshots
Verdict
The clearest difference is in-app purchases: Note by Xi at none against Delta Calc's 3. Delta Calc's advantage is update cadence (every 3 days vs every 8 days). On price, ads, device support 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
Delta Calc costs $0.99 and Note by Xi $0.99 up front. Delta Calc sells 3 in-app purchases, starting at $0.99 per month. Note by Xi asks for nothing beyond the download.
Delta Calc ships an update every 3 days, Note by Xi every 8 days. The most recent releases landed on October 17, 2026 and October 19, 2026 respectively.
| Parameter | Delta Calc | Note by Xi |
|---|---|---|
| Price | $0.99 | $0.99 |
| Rating | 5.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 3 days — better | Every 8 days |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 | 17.6 |
| Further details — not scored | ||
| Size | 2 MB | 56 MB |
| Age rating | 4+ | 4+ |
| Developer | Stephen Coffey | 鉴 郗 |
In-app purchases
Delta Calc
- Delta Calc Monthly$0.991 Month
- Delta Calc Yearly$4.991 Year
- Delta Calc Lifetime$9.99
Note by Xi
No in-app purchases
