Spectroslide vs True Random Numbers
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Spectroslide
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Spectroslide is a static noise generator that allows the user to discover their own custom sound. Slide up and down to navigate to the different frequencies ("red", "pink", and "brown") and background colors, and left and right to change the audible pitch and color hue. The app will save your favorite spot, and you can change it any time you like after a 1 second press on the screen.
True Random Numbers
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Most random number generators calculate the numbers with pseudo random number generators. But this app leverages your device's motion sensors, swipes, or camera input, to generate authentically random numbers and shuffles. It also doesn't have a modulo bias, a common problem with random number generators.
Screenshots
Verdict
The clearest difference is in-app purchases: Spectroslide at none against True Random Numbers's 1. Spectroslide also leads on ads (none vs shown). True Random Numbers's advantage is update cadence (every 2 days vs every 9 months). On price, 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
Both are free to download. True Random Numbers sells 1 one-off in-app purchase. Spectroslide asks for nothing beyond the download.
Spectroslide ships an update every 9 months, True Random Numbers every 2 days. The most recent releases landed on September 28, 2026 and September 20, 2026 respectively.
| Parameter | Spectroslide | True Random Numbers |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 9 months | Every 2 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.5 — better | 17.6 |
| Further details — not scored | ||
| Size | 2 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Eric Hamiter | Frank Buss |
In-app purchases
Spectroslide
No in-app purchases
True Random Numbers
- Remove Ads$1.99
Questions
Is Spectroslide free?
Is True Random Numbers free?
Do Spectroslide or True Random Numbers have ads?
Which is updated more often, Spectroslide or True Random Numbers?
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