Comparison

Signal Generator vs Prometheus

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Signal Generator

Generate high-quality audio signals including sine, square, triangle, sawtooth waves, and white/pink noise. Ideal for testing audio systems, frequency response, and hearing capabilities.

Highlights
  • Sine wave generation
  • Square wave generation
  • White noise generation
  • Pink noise generation
  • Two-channel phase difference waves
  • Audio frequency response testing
  • Hearing test capabilities
Features
Read full description

A high-quality audio Signal Generator for the iPhone. Now you can have a professional grade signal generator for your iPhone. Create sine waves, square waves, white noise, and pink noise. The signal generator can help you generate sine, square, triangle, sawtooth, white noise, pink noise signals and generate sine two-channel phase difference waves. You can use the signal generator to test your audio frequency response system, system noise scanning, headset burning machine and other scenarios. Test your hearing can hear how low the frequency of sound. Able to apply and experiment with test scenarios.

About

Prometheus

Visualize your life as a continuously updating clock, down to 10 decimal places. Track unique milestones and explore life statistics. Available on iPhone and Apple Watch with customizable widgets and complications.

Highlights
  • Decimal age clock
  • Life milestone countdowns
  • Detailed life statistics
  • Apple Watch app and complications
  • Home and Lock Screen widgets
  • Live Activities support
Features
Read full description

Your time is precious. See it. Prometheus turns your age into a living clock, updating continuously to 10 decimal places. Count down to numbers you will only pass once, explore your life in weeks and statistics, and keep time visible across iPhone and Apple Watch. YOUR LIFE, LIVE • See your decimal age or a detailed breakdown of years, months, days, hours, minutes, and seconds • Count down to your billionth second, 10,000th day, next trip around the sun, and other once-in-a-lifetime milestones • Get an optional alert at the exact moment a milestone arrives • Explore estimated heartbeats and breaths, lunar cycles, distance traveled through space, and more • See your entire life as one dot for every week ON EVERY SCREEN • Apple Watch app and watch face complications • Home Screen and Lock Screen widgets • Live Activities on the Lock Screen and Dynamic Island • Shareable cards for Stories, Reels, and more SET UP ONCE Enter your birth date and time. Prometheus handles the rest. Your birth data stays on your devices, and no account or sign-in is required. Named after the Titan who gave humanity fire and knowledge, Prometheus is a reminder to see and use your most precious resource: time.

Screenshots

Signal Generator4 screens
Prometheus4 screens

Verdict

The call

The clearest difference is price: Prometheus at Free against Signal Generator's $0.99. Prometheus also leads on rating (5.0 vs 4.6) and update cadence (every 3 months vs every 15 months). Signal Generator's advantage is ratings volume (10 vs 1) and iOS requirement (11.0 vs 17.6). On ads, in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

Prometheus is free to download; Signal Generator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Prometheus holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Signal Generator has 10 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Signal Generator ships an update every 15 months, Prometheus every 3 months. The most recent releases landed on October 29, 2026 and October 19, 2026 respectively.

Scorecard6 real differences · 4 level
Signal Generator versus Prometheus: the parameters behind the verdict, then further details
ParameterSignal GeneratorPrometheus
Price$0.99Free — better
Rating4.6 (10 ratings)5.0 (1 ratings) — better
Positive reviews85.7% of reviews—
Number of ratings10 — better1
Update frequencyEvery 15 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPodiPhone, Apple Watch
Requires iOS11.0 — better17.6
Further details — not scored
Size2 MB5 MB
Age rating12+4+
Developer龙刚 李Wouter Stierhout

Customer experience

Signal Generator

All ratings10 ratings
Positive90.0%
Neutral10.0%
Negative0.0%
Written reviews7 reviews
Positive85.7%
Neutral14.3%
Negative0.0%

Prometheus

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Signal Generator

No in-app purchases

None

Prometheus

No in-app purchases

Questions

Is Signal Generator free?
Signal Generator costs $0.99, with no in-app purchases.
Is Prometheus free?
Prometheus is free to download, with no in-app purchases.
Which has better reviews, Signal Generator or Prometheus?
Prometheus is rated higher. Signal Generator averages 4.6 out of 5 from 10 ratings, while Prometheus averages 5.0 from 1 ratings.
Do Signal Generator or Prometheus have ads?
Neither Signal Generator nor Prometheus shows ads.
Which is updated more often, Signal Generator or Prometheus?
Signal Generator ships an update every 15 months, and Prometheus every 3 months. Most recently, Signal Generator was updated on October 29, 2026 and Prometheus on October 19, 2026.

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