Comparison

Spectrolite vs G.T.F.O.

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

Head to head
About

Spectrolite

This app visualizes sound in real-time using various spectrogram types. Explore detailed audio data with intuitive touch controls and adjustable parameters. An optional purchase unlocks advanced measurement tools.

Highlights
  • Real-time spectrogram visualization
  • Constant-Q, linear, and mel frequency scales
  • Full human hearing frequency range
  • Intuitive touch panning and zooming
  • Adjustable gain, Q, and other parameters
  • Pro version: grids, scales, spectrum view, tap-to-measure
Features
Read full description

Spectrolite visualizes sound as spectrograms in real time. Spectrolite supports constant-Q spectrograms, which use a logarithmic frequency scale for a display where musical notes are evenly spaced. Spectrograms based on linear and mel frequency scales are also supported. The display covers the full frequency range of human hearing. Intuitive touch panning and zooming lets you dive in and explore the spectrograms in detail. Gain, Q, and other parameters can be adjusted in real time and instantly apply to the display of past signals as well as future ones. The Pro in-app purchase adds grids and scales for time, frequency, and amplitude, as well as a spectrum view and a tap-to-measure function. This expands Spectrolite into an audio measurement tool that you can use to measure frequencies, musical pitches, amplitudes, and durations.

About

G.T.F.O.

Read full description

Be the 007 of stopping or avoiding any conversation with a perfectly timed phone call from your lock screen or action button. *Calls will only go to device with activated cell service and working sim card. [Subscription Options] • The app is free to download, but you must subscribe ($1.99 a week or $39.99 a year) in order to receive calls. • Subscribing gives you access to the full features of the app, which means setting a call time with 0-60 secs an unlimited amount times. • Subscriptions are billed automatically at the rate depending on the selected subscription options. • Subscriptions are managed by the Apple Store Manage auto-renewal through account settings or at: https://support.apple.com/en-us/HT202039 [Privacy and Security] In order to run, G.T.F.O. App collects and stores your phone number and call timer time on your device ONLY. All data (phone number, call timer) is only stored on your device. When you delete the app, your data is deleted. [Terms of Use] EULA Link: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Standard call and message rates may apply.

Screenshots

Spectrolite4 screens
G.T.F.O.1 screens

Verdict

The call

The clearest difference is update cadence: G.T.F.O. at fortnightly against Spectrolite's every 8 months. Spectrolite's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 18.0). On price, ads and in-app purchases 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

Both are free to download. Spectrolite sells 1 one-off in-app purchase and G.T.F.O. sells 5 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Spectrolite ships an update every 8 months, G.T.F.O. fortnightly. The most recent releases landed on October 25, 2026 and October 8, 2026 respectively.

Scorecard3 real differences · 7 level
Spectrolite versus G.T.F.O.: the parameters behind the verdict, then further details
ParameterSpectroliteG.T.F.O.
PriceFreeFree
Rating4.8 (64 ratings) — better—
Positive reviews83.3% of reviews—
Number of ratings64 — better—
Update frequencyEvery 8 monthsFortnightly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.6 — better18.0
Further details — not scored
Size1 MB77 MB
Age rating4+4+
DeveloperWaxing WaveDaisydoor

In-app purchases

1 purchases

Spectrolite

One-time1
  • Pro$4.99
5 purchases

G.T.F.O.

Subscriptions5
  • All Access2 variants$0.997 Days
  • All Access2 variants$1.997 Days
  • All Access$9.991 Year
Show 2 more
  • All Access$19.991 Year
  • All Access$39.991 Year

Questions

Is Spectrolite free?
Spectrolite is free to download, with in-app purchases available.
Is G.T.F.O. free?
G.T.F.O. is free to download, with in-app purchases available.
Do Spectrolite or G.T.F.O. have ads?
Neither Spectrolite nor G.T.F.O. shows ads.
Which is updated more often, Spectrolite or G.T.F.O.?
Spectrolite ships an update every 8 months, and G.T.F.O. fortnightly. Most recently, Spectrolite was updated on October 25, 2026 and G.T.F.O. on October 8, 2026.

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