# SDR vs GridCalc

The clearest difference is price: GridCalc at $14.99 against SDR's $44.99. GridCalc also leads on rating (5.0 vs 4.5) and update cadence (every 4 days vs every 2 weeks). SDR's advantage is ratings volume (64 vs 2) and chart position (#192 vs unranked). On ads, in-app purchases, monetization model and device support there is nothing between them.

SDR costs $44.99 and GridCalc $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

GridCalc holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: SDR has 64 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 84% of SDR's written reviews are positive against 100% of GridCalc's.

SDR ships an update every 2 weeks, GridCalc every 4 days. The most recent releases landed on October 15, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | SDR | GridCalc |
| --- | --- | --- |
| Price | $44.99 | **$14.99** |
| Rating | [4.5 (64 ratings)](https://appshunter.io/ios/app/sdr-control-mobile/id1673327509/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/gridcalc/id6759011187/reviews)** |
| Number of ratings | **64** | 2 |
| Positive reviews | 84.1% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 4 days** |
| Monetization | Paid | Paid |
| Best chart rank | **#192** | — |
| Size | 47 MB | 5 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Marcus Roskosch](https://appshunter.io/developer/334053438) | [ALAN WILLIAM DIPERT](https://appshunter.io/developer/1875969414) |

## What reviewers say

### SDR

[App page](https://appshunter.io/ios/app/sdr-control-mobile/id1673327509)

**Currently charting:** #192 Top Paid · Utilities (US App Store)

Control your Icom transceiver remotely or locally from your iPhone. Operate in all modes, log QSOs, and utilize integrated digital modes like FT8/FT4 and SSTV. No extra hardware is needed for global access.

**Highlights:** Remote transceiver operation, All mode control, Auto logging logbook, Integrated FT8/FT4 tool, Integrated SSTV receiver, Integrated CW decoder and keyer, DX-Cluster integration

**In-app purchases:** none

**What reviewers like**

- 🚀 Works perfectly with ICOM radios
- 👍 Intuitive and easy to use
- 🌟 Feature-rich and comprehensive
- 💯 Stable and reliable performance
- 📱 Great for remote operation

**What reviewers complain about**

- 🐛 FT8 decoding issues (lower signal levels)
- 🐛 Dialogs do not scale with larger text setting
- 🐛 UI elements can be cramped on iPhone
- 🐛 Some buttons are small and hard to press
- 🐛 Frequency display overlaps buttons

**Reported bugs**

- Dialogs do not scale with larger text setting
- Frequency display overlaps buttons
- FT8 decoding issues (lower signal levels than WSJTX)
- App crashes and leaves radio in transmit
- Logbook export not functional after update

**Requested features**

- Develop for IC-7800
- CarPlay support
- Apple Watch add-on
- Windows version
- JS8call support


### GridCalc

[App page](https://appshunter.io/ios/app/gridcalc/id6759011187)

This calculator app uses a grid interface to visualize every step of your calculations. It combines Reverse Polish Notation with a structured grid, allowing you to reference previous cells and see immediate recalculations when inputs change. Ideal for detailed, ad-hoc modeling on mobile.

**Highlights:** Visible grid for calculations, Reverse Polish Notation (RPN), Incremental number entry, Reference prior cells, Immediate recalculation on input change, Structured problem solving

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SDR free?

SDR costs $44.99, with no in-app purchases.

### Is GridCalc free?

GridCalc costs $14.99, with no in-app purchases.

### Which has better reviews, SDR or GridCalc?

GridCalc is rated higher. SDR averages 4.5 out of 5 from 64 ratings, while GridCalc averages 5.0 from 2 ratings.

### Do SDR or GridCalc have ads?

Neither SDR nor GridCalc shows ads.

### Which is updated more often, SDR or GridCalc?

SDR ships an update every 2 weeks, and GridCalc every 4 days. Most recently, SDR was updated on October 15, 2026 and GridCalc on October 1, 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.*