iAttenuation vs DX Spots
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iAttenuation
This app calculates resistor values for various passive attenuator networks. It supports T, Pi, H, O, and Minimum Loss Pad configurations, allowing users to input impedance and desired attenuation. It can also adjust resistor values to standard tolerances.
- Calculates resistor values for passive attenuator networks
- Supports Tee, Pi, H, O, and Minimum Loss Pad configurations
- Input and output impedance calculation
- Desired attenuation input
- Adjusts resistor values to standard tolerances (1%, 5%, 10%)
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Passive attenuators are two port / four terminal resistive networks that are designed to reduce (or attenuate, hence their name) the power between a source and load. They can also match the impedance between the source and load. They are used in a variety of audio and radio / RF applications. iAttenuation calculates resistor values for the following types of attenuator networks: Tee Network Pi Network H (Balanced Tee) O (Balanced Pi) Minimum Loss Pad Just enter in the input and output impedance values, and the desired attenuation, and iAttenuation does the rest! iAttenuation can also adjust the calculated resistor values to match the nearest standard 1%, 5%, or 10% tolerance values.
DX Spots
This app provides a live feed of amateur radio spots from the DX Cluster network. It allows users to view current spots across all bands and modes, perform QRZ lookups, and submit their own spots to the network.
- Live DX Cluster feed
- Amateur radio spots
- All bands and modes
- QRZ lookup
- Submit spots
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This application displays spot data submitted to cluster server. Live feed of the DX Cluster network, Showing all the current Amateur (Ham) Radio spots. On all bands and modes QRZ Lookup and ability to submit spots onto the DX Cluster network
Screenshots
Verdict
The clearest difference is price: DX Spots at Free against iAttenuation's $2.99. DX Spots also leads on rating (3.5 vs 3.0) and update cadence (every 10 days vs every 69 months). iAttenuation's advantage is in-app purchases (none vs 5) and ads (none vs shown). On device support and iOS requirement 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
DX Spots is free to download; iAttenuation costs $2.99 up front. DX Spots sells 5 in-app purchases, starting at $0.99 per month. iAttenuation asks for nothing beyond the download.
DX Spots holds the better App Store score, 3.5 against 3.0. That said, the two scores are not equally well evidenced: DX Spots has 11 ratings behind it against 2, so its average is the more settled of the two.
iAttenuation ships an update every 69 months, DX Spots every 10 days. The most recent releases landed on October 5, 2026 and October 12, 2026 respectively.
| Parameter | iAttenuation | DX Spots |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 3.0 (2 ratings) | 3.5 (11 ratings) — better |
| Positive reviews | — | 28.6% of reviews |
| Number of ratings | 2 | 11 — better |
| Update frequency | Every 69 months | Every 10 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 1 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Black Cat Systems | Jonathan Gibbs |
Customer experience
iAttenuation
DX Spots
In-app purchases
iAttenuation
No in-app purchases
DX Spots
- DXSpots Monthly Subscription$0.991 Month
- DXSpots 3 Month Subscription$1.993 Months
- DXSpots 6 Month Subscription$2.996 Months
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- DXSpots Yearly Subscription$7.991 Year
- DX Spots - Remove Ads$4.99
