Grid Locator Calculator vs SWLog
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Grid Locator Calculator
This app helps Amateur Radio operators quickly find their Maidenhead Grid Locator reference using their iPhone's GPS. It works offline and provides 10-digit locators, which can be truncated to 4 or 6 digits as needed. Ideal for portable operations in unfamiliar locations.
- Calculates 10-digit grid locators
- Uses iPhone GPS
- Offline functionality
- Supports 4, 6, and 10-digit locators
- Ideal for portable operations
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For Amateur Radio operators who often travel to unknown places. Forgot to check GL reference? Do not worry. If you have iPhone and GPS is working then you can check your location's GL reference very easily. You do not need internet connection. Ideal if you go to mobile or portable operation often and not sure where GL boundaries are. App shows you 10 digit locator. If you need only 4 or 6 digit, just use first 4 digit or 6 digit, respectively. Note: Usually Grid Locator is 6 digit as defined in ARRL document. This 10 digit is expansion of 6 digit as 7th and 8th are divided by 10 ("0" through "9") then 9th and 10th are divided by 24 ("a" through "x"). This logic is based on article on Wikipedia.
SWLog
Log amateur radio QSOs and broadcast transmissions on your mobile device. Supports QRZ lookups and various broadcast schedule queries for station identification. Features GPS integration and local log browsing, with the ability to upload to a main logging program.
- Log amateur radio QSOs
- Log broadcast transmissions
- QRZ lookups
- Broadcast schedule lookups
- GPS integration
- Upload logs to main program
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SWLog is a mobile companion application to the full SWLog suite or logging and radio control applications. SWLog allows amateur radio and broadcast (shortwave, AM/FM, and utility) transmissions to be logged locally and later uploaded to the main logging program. QRZ can be used for lookups for amateur radio logs. For broadcast logs, various program schedules from ADDX, AOKI, EIBI, FCC, HFCC, ILGRadio, and SWSkeds are queried to aid in identifying the station. Features of this app include: * Download a preset list of locations, radios, and broadcast program schedules * Add an amateur radio QSO * Supports QRZ lookups * Monitor POTA spots * Add a POTA spot * Add a broadcast log * Supports lookups to various program schedules * GPS integration including calculating the current grid square to 10 characters * View/Browse locally added logs * Upload logs to the main logging program
Screenshots
Verdict
The clearest difference is review sentiment: Grid Locator Calculator at 100% against SWLog's 25%. Grid Locator Calculator also leads on iOS requirement (10.0 vs 16.1). SWLog's advantage is update cadence (fortnightly vs every 4 months). On price, ads, in-app purchases and monetization model 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Grid Locator Calculator ships an update every 4 months, SWLog fortnightly. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.
| Parameter | Grid Locator Calculator | SWLog |
|---|---|---|
| Price | Free | Free |
| Rating | — | 1.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 25.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 4 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 10.0 — better | 16.1 |
| Further details — not scored | ||
| Size | 22 MB | 305 MB |
| Age rating | 4+ | 4+ |
| Developer | Kazunori Watanabe | Robert Sillett |
Customer experience
Grid Locator Calculator
SWLog
In-app purchases
Grid Locator Calculator
No in-app purchases
SWLog
No in-app purchases
Questions
Is Grid Locator Calculator free?
Is SWLog free?
Do Grid Locator Calculator or SWLog have ads?
Which is updated more often, Grid Locator Calculator or SWLog?
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