# SDR vs GridCalc

The clearest difference is price: GridCalc at $14.99 against SDR's $49.99. GridCalc also leads on rating (5.0 vs 4.2) and review sentiment (100% vs 78%). SDR's advantage is ratings volume (70 vs 3). On ads, in-app purchases, monetization model and device support there is nothing between them.

SDR costs $49.99 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 4.2. That said, the two scores are not equally well evidenced: SDR has 70 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 78% 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 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | SDR | GridCalc |
| --- | --- | --- |
| Price | $49.99 | **$14.99** |
| Rating | [4.2 (70 ratings)](https://appshunter.io/ios/app/sdr-control-for-icom/id1614141094/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/gridcalc/id6759011187/reviews)** |
| Number of ratings | **70** | 3 |
| Positive reviews | 78.0% 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 |
| Size | 55 MB | 5 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | iPad | **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-for-icom/id1614141094)

Control compatible Icom transceivers remotely or locally from your iPad. Offers full operation, dual VFO, a logbook, and integrated digital modes like FT8/FT4, SSTV, and CW decoding.

**Highlights:** Remote transceiver operation, Dual VFO and DualWatch, Integrated logbook with ADIF support, FT8/FT4, SSTV, and CW decoder tools, DX-Cluster integration, Call sign lookup and map display

**In-app purchases:** none


### 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 $49.99, 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 4.2 out of 5 from 70 ratings, while GridCalc averages 5.0 from 3 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 26, 2026 and GridCalc on October 24, 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.*