Comparison

CallTimer Premium vs Stereo Microphone

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

Head to head
About

CallTimer Premium

This app helps you manage call durations by providing notifications at set intervals. It's ideal for users on fixed-minute calling plans and offers features like call history, one-tap dialing, and customizable alerts. It supports hands-free and headset usage.

Highlights
  • Call duration timer
  • Configurable notifications
  • Call history logging
  • One-tap dialing
  • Prefix number support
  • Customizable alerts and sounds
  • Hands-free compatibility
Features
Read full description

Before you start To help CallTimer work properly, check the following in your iPhone's Settings: • Notifications are enabled for CallTimer. • Vibration is enabled. Please note: due to iOS restrictions, the app cannot end calls automatically. About CallTimer CallTimer tracks call duration and notifies you at the time you set. It is ideal for mobile plans that include unlimited calls of up to 5, 10 or another set number of minutes per call. It is also useful for calling services that require a dialing prefix. Premium features 1. Call history Saves the history of calls made through CallTimer. Incoming calls are not recorded. 2. One-tap calling Tap a bookmarked number to make a call. To bookmark a number, swipe left on its row in the call history. 3. Dialing prefixes Add a dialing prefix of your choice. 4. Customization • Set the number of vibrations and notification sounds. • Adjust notification sound volume. • Lock the alarm and call type settings. • Automatically clear the number after a call ends. • Choose the screen shown when the app opens. 5. Handy shortcut Press and hold the delete button in the phone number field to clear the entire number. 6. Hands-free support Supports calls using earphones and hands-free devices.

About

Stereo Microphone

Transform your device into a powerful microphone or audio recorder. Enhance your sound with built-in effects like pitch shifting and equalization, and choose from various high-quality recording formats.

Highlights
  • Device as microphone
  • Audio recording
  • Pitch shifter effect
  • 10-band equalizer
  • Multiple recording formats
  • Noise reduction
  • System voice processing
Features
Read full description

Use your iPhone/iPad as a microphone and output sound to headphones or speakers. You can also use it to record audio instead of playing sound. The app comes with four built-in effects. Stereo input is available on compatible devices only. The microphone on the iPhone is positioned vertically, so by using it in landscape orientation, you can experience a greater sense of stereo sound. Please note that this app was created just for my personal use, and I cannot guarantee its performance on devices I do not own. Voice preprocess: - System Voice Processing - Noise Reduction - Auto Gain Control Included effects: - Pitch shifter - Chorus - Reverb - 10-band equalizer Supported devices with stereo input (unconfirmed): - iPhone XS or later - iPhone SE 2nd generation or later - iPad Pro 11-inch 1st generation or later - iPad Pro 12.9-inch 3rd generation or later Recording file formats: - MPEG4 AAC 44.1kHz 192kbps Stereo (.m4a, Up to 24 hours) - MPEG4 AAC 44.1kHz 128kbps Stereo (.m4a, 24h) - MPEG4 AAC 48kHz 192kbps Stereo (.m4a, 24h) - MPEG4 AAC 48kHz 256kbps Stereo (.m4a, 24h) - MPEG4 AAC 48kHz 320kbps Stereo (.m4a, 24h) - MPEG4 AAC 44.1kHz 96kbps Stereo (.m4a, 24h) - MPEG4 AAC 32kHz 64kbps Stereo (.m4a, 24h) - PCM 44.1kHz 16bit Integer Stereo (.wav, 6h) - PCM 48kHz 16bit Integer Stereo (.wav, 6h) - PCM 44.1kHz 32bit Float Stereo (.wav, 3h) - PCM 48kHz 32bit Float Stereo (.wav, 3h) * You can add a timecode when you use a PCM format. If you are using an external stereo microphone, please set the input channel to stereo in the settings. Please note that: - The screenshots are simulated images. The actual display may differ. - This app and descriptions contain machine translated text.

Screenshots

CallTimer Premium4 screens
Stereo Microphone4 screens

Verdict

The call

The clearest difference is review sentiment: Stereo Microphone at 85% against CallTimer Premium's 60%. Stereo Microphone also leads on price ($2.99 vs $3.99). CallTimer Premium's advantage is update cadence (fortnightly vs every 6 weeks). On ads, in-app purchases, monetization model 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

CallTimer Premium costs $3.99 and Stereo Microphone $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

CallTimer Premium ships an update fortnightly, Stereo Microphone every 6 weeks. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

Scorecard3 real differences · 7 level
CallTimer Premium versus Stereo Microphone: the parameters behind the verdict, then further details
ParameterCallTimer PremiumStereo Microphone
Price$3.99$2.99 — better
Rating—4.4 (9 ratings) — better
Positive reviews60.4% of reviews85.0% of reviews — better
Number of ratings—9 — better
Update frequencyFortnightly — betterEvery 6 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.015.0
Further details — not scored
Size6 MB3 MB
Age rating4+4+
DeveloperChunxu QiuRyouta Kira

Customer experience

CallTimer Premium

Written reviews53 reviews
Positive60.4%
Neutral17.0%
Negative22.6%

Stereo Microphone

All ratings9 ratings
Positive88.9%
Neutral0.0%
Negative11.1%
Written reviews20 reviews
Positive85.0%
Neutral5.0%
Negative10.0%

In-app purchases

None

CallTimer Premium

No in-app purchases

None

Stereo Microphone

No in-app purchases

Questions

Is CallTimer Premium free?
CallTimer Premium costs $3.99, with no in-app purchases.
Is Stereo Microphone free?
Stereo Microphone costs $2.99, with no in-app purchases.
Do CallTimer Premium or Stereo Microphone have ads?
Neither CallTimer Premium nor Stereo Microphone shows ads.
Which is updated more often, CallTimer Premium or Stereo Microphone?
CallTimer Premium ships an update fortnightly, and Stereo Microphone every 6 weeks. Most recently, CallTimer Premium was updated on October 29, 2026 and Stereo Microphone on October 27, 2026.

Other comparisons