# Calculator T vs SoloEcho

The clearest difference is in-app purchases: Calculator T at none against SoloEcho's 1. Calculator T also leads on update cadence (every 2 days vs every 5 weeks) and iOS requirement (11.0 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. SoloEcho sells 1 one-off in-app purchase. Calculator T asks for nothing beyond the download.

Calculator T ships an update every 2 days, SoloEcho every 5 weeks. The most recent releases landed on October 19, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Calculator T | SoloEcho |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 5 weeks |
| Monetization | Free | — |
| Size | 16 MB | 5 MB |
| Requires iOS | **11.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Xiao Hou Yi Sheng Traditional Chinese Medicine Technology (Shenzhen) Co., Ltd](https://appshunter.io/developer/1524258136) | [恒俭 董](https://appshunter.io/developer/947356968) |

## What reviewers say

### Calculator T

[App page](https://appshunter.io/ios/app/calculator-t/id6473983653)

This app offers advanced scientific calculation and unit conversion capabilities. It features a history tape, memory functions, and supports complex mathematical operations. It also includes currency exchange rates and a wide range of measurement conversions.

**Highlights:** Standard and scientific function modes, Extensive unit conversion (over 300 units), History tape for last 100 records, Memory buttons (MS, M+, M-, MR, MC), Copy/paste functionality for equations and results, Support for large number calculations and scientific notation, Currency exchange rate conversion

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

**In-app purchases:** none


### SoloEcho

[App page](https://appshunter.io/ios/app/soloecho/id6760158629)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Lifetime | $1.99 | one-time |


## Frequently asked questions

### Is Calculator T free?

Calculator T is free to download, with no in-app purchases.

### Is SoloEcho free?

SoloEcho is free to download, with in-app purchases available.

### Do Calculator T or SoloEcho have ads?

Neither Calculator T nor SoloEcho shows ads.

### Which is updated more often, Calculator T or SoloEcho?

Calculator T ships an update every 2 days, and SoloEcho every 5 weeks. Most recently, Calculator T was updated on October 19, 2026 and SoloEcho on October 25, 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.*