# Solve vs Date.Time Calculator

The clearest difference is review sentiment: Solve at 82% against Date.Time Calculator's 0%. Solve also leads on update cadence (monthly vs every 5 months). Date.Time Calculator's advantage is price ($0.99 vs $1.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Solve costs $1.99 and Date.Time Calculator $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Solve ships an update monthly, Date.Time Calculator every 5 months. The most recent releases landed on August 20, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Solve | Date.Time Calculator |
| --- | --- | --- |
| Price | $1.99 | **$0.99** |
| Rating | **[4.7 (198 ratings)](https://appshunter.io/ios/app/solve-graphing-calculator/id299460923/reviews)** | — |
| Number of ratings | **198** | — |
| Positive reviews | **82.5% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 5 months |
| Monetization | **Free** | Paid |
| Size | 5 MB | 1 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pomegranate Apps LLC](https://appshunter.io/developer/293619496) | [Noriaki HASHIBA](https://appshunter.io/developer/978336077) |

## What reviewers say

### Solve

[App page](https://appshunter.io/ios/app/solve-graphing-calculator/id299460923)

This app offers a powerful graphing calculator with multiple functions. It solves expressions as you type and features an innovative memory system to store and recall answers. Easily plot 2D, 3D, polar, and time-based graphs with intuitive controls.

**Highlights:** Solves expressions as you type, Innovative memory system, Four distinct calculator tabs, 2D and 3D function plotting, Polar and time graphing, Plot multiple functions simultaneously

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Intuitive and user-friendly interface
- 💡 Multiple calculator pages for simultaneous calculations
- 📊 Powerful graphing capabilities (2D, 3D, time-based)
- 🎨 Visually appealing design with color options
- ⚡ Fast and responsive performance

**What reviewers complain about**

- 🐛 Gesture conflict with iOS swipe-to-exit (requires two swipes)
- 🐛 Home indicator hidden, complicating app exit
- 🔢 Floating-point precision errors (100 + 0.1 ≠ 100.1)
- ⚠️ Lacks percent button functionality
- ⚠️ Missing some advanced functions (floor, ceil, derivatives, integrals)

**Reported bugs**

- Swipe up from bottom requires two swipes to exit app or switch apps
- Home indicator hidden causes navigation issues
- Floating-point arithmetic errors in decimal calculations
- Inverse trigonometric functions (cos⁻¹, sin⁻¹) calculate in reverse
- Graph plotting errors (e.g., sqrt(5²-x²) shows incomplete circle)

**Requested features**

- Fix swipe-to-exit gesture conflict with iOS
- Add percent button for quick percentage calculations
- Implement undo/redo functionality
- Add calculation history storage and management
- Support for independent X/Y axis scaling


### Date.Time Calculator

[App page](https://appshunter.io/ios/app/datetime-calculator/id978336078)

Calculate date and time differences, intervals, and perform unit conversions with a pure calculator interface. Useful for determining future or past dates, calculating total time for multiple events, and converting between various time units and POSIX time.

**Highlights:** Date and time point calculations, Time interval calculations, Unit conversion of time, POSIX time interconversion, Time zone mutual conversion, Arithmetic operations with time

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Solve free?

Solve costs $1.99, with no in-app purchases.

### Is Date.Time Calculator free?

Date.Time Calculator costs $0.99, with no in-app purchases.

### Do Solve or Date.Time Calculator have ads?

Neither Solve nor Date.Time Calculator shows ads.

### Which is updated more often, Solve or Date.Time Calculator?

Solve ships an update monthly, and Date.Time Calculator every 5 months. Most recently, Solve was updated on August 20, 2026 and Date.Time Calculator on September 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*