Delta Calc vs Chartes
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
Chartes
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Chartes delivers professional PDF scanning with complete privacy with zero complexity. 100% Offline. No subscription. No watermark. Multi-Language Support English, Chinese, and Spanish. SCAN TO PDF INSTANTLY Turn any document into a crisp PDF in seconds. Receipts, contracts, notes, letters - capture with your camera and export as a professional PDF ready to share. Multi-page support lets you scan entire documents in one session. PRECISION CROPPING Frame your scans perfectly with preset aspect ratios: Letter, Legal, A4, Half Letter, or freeform. Every PDF looks clean and properly formatted. ENHANCE YOUR SCANS Apply filters to optimize readability. Keep original color for photos and graphics. Use grayscale for general documents. Choose black and white for maximum clarity on text-heavy pages. Rotate pages to perfect orientation. SHARE ANYWHERE Export your PDFs instantly to email, messaging apps, cloud storage, or any app on your device. Choose standard quality for smaller files or high quality for archival-grade output. SUPPORT 4 LANGUAGES English, Traditional Chinese, Simplified Chinese, and Spanish PRIVACY BY DESIGN Your PDFs never leave your device. No cloud uploads. No account required. No tracking or analytics. Scan sensitive documents with confidence - everything stays local. PAY ONCE, OWN FOREVER No subscriptions. No in-app purchases. No ads. Just a thoughtfully crafted PDF scanner that respects your time and privacy. ORGANIZE YOUR SCANS - Automatic file naming or custom names - Visual library shows all PDFs at a glance - Rename documents anytime - Bulk select and delete - View page count, file size, and creation date FEATURES - Instant PDF creation - Multi-page scanning - Precision cropping with presets - Color, grayscale, and B&W filters - Page rotation - Flash control for low light - Local-only storage - No subscription From the Greek chartes, meaning "paper" Pay once, own forever. Built with Love by AiofEffect LLC Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://aiofeffect.com/privacy Terms & Conditions: https://aiofeffect.com/terms
Screenshots
Verdict
The clearest difference is price: Chartes at Free against Delta Calc's $0.99. Chartes also leads on iOS requirement (15.1 vs 17.6). Delta Calc's advantage is update cadence (every 3 days vs every 6 weeks). On ads, in-app purchases and device support 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
Chartes is free to download; Delta Calc costs $0.99 up front. Delta Calc sells 3 in-app purchases, starting at $0.99 per month and Chartes sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Delta Calc ships an update every 3 days, Chartes every 6 weeks. The most recent releases landed on June 1, 2026 and September 15, 2026 respectively.
| Parameter | Delta Calc | Chartes |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 3 days — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 2 MB | 50 MB |
| Age rating | 4+ | 4+ |
| Developer | Stephen Coffey | Aiofeffect LLC |
In-app purchases
Delta Calc
- Delta Calc Monthly$0.991 Month
- Delta Calc Yearly$4.991 Year
- Delta Calc Lifetime$9.99
Chartes
- Chartes Lifetime$1.99









