Comparison

Ops Clock vs Bel Canto Serioso

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

Head to head
About

Ops Clock

A versatile utility app offering a world clock with over 400 cities, unlimited timers, and three powerful calculators for time zone, time, and date arithmetic. It also features an event log to track real-time occurrences and elapsed times.

Highlights
  • World clock with 400+ cities
  • Unlimited count-up and countdown timers
  • Time zone, time, and date calculators
  • Event log with elapsed time tracking
  • Customizable labels and notifications
Features
Read full description

Professional grade clock and timer tool with four functions in one app: • World clock • Digital seconds display • Compact format • Over 400 cities • Set custom labels • Clocks sorted automatically • Unlimited number of timers • Count-up timers • Countdown timers • Wall clock timers • End-time notifications • Pre-notifications • Elapsed time and ETA in any zone • Three calculators • Time zone calculator helps plan multi-city conf calls • Time calculator for time arithmetic, including across different time zones • Date calculator for date arithmetic • Event Log • Stores a record of real-time events • Shows elapsed time between events This app is free, shows no advertisements, makes no use of the network and collects no personal information. Available in English, Spanish, French, Italian and Portuguese.

About

Bel Canto Serioso

This voice training utility offers over 60 vocal exercises for ear training and solfege practice. Customize exercises by tonality, range, tempo, and interval span. Features manual and auto playback modes for flexible practice.

Highlights
  • 60+ vocal exercises
  • Customizable tonalities and ranges
  • Adjustable tempo (45-260 bpm)
  • Filter exercises by interval and motion
  • Manual and auto player modes
  • Solfege system selection (English, Italian, Chromatic)
  • Bookmarking for exercises
Features
Read full description

Bel Canto Serioso is a voice training tool with various vocal exercises. It can also be used for ear training and practicing solfege, chromatic solfege. For now it has 60+ vocal exercises which can be played in either major or minor tonalities* in any given range and bpm. *For example; you can play Rossini Scale in major or in harmonic minor, the pentatonic exercises as major pentatonic or minor pentatonic. Triad/arpeggio exercises can be played in 5 qualities; major, minor, suspended, diminished and augmented. Some exercises can also be played in whole tone scale. Exercises can be filtered by interval span: third, fifth, sixth... or by motion: descending, stepwise, skipwise, agility, glides, diatonic... Exercise ranges can be set for a given voice classification. Female/Male Advanced section can be used if classified ranges are limiting. All scales can be played at any tempo between 45 and 260 bpm. Exercises can be bookmarked for quicker reference. The playing note of the scale is shown as text; Bb4 (or Sib4 or Te4) or as scale degree 1, b3, 5... In the settings you can set the solfege system to be used within the app. Solfege system choices are, English, Italian and Chromatic Solfege. The app will then display all note names in the chosen solfege system. There are two player modes; - Auto mode plays the exercises in a given range as usual. - In Manual mode the pattern/scale of the exercise can be advanced higher or lower manually. This is similar to practicing with an instrument, like playing a scale more than a few times at a problematic zone in your range ad advancing when done. Some of the included exercises are; Repeated Tone Third Jumps 3 Tone 5 Note ~ Chromatic Fifth Jumps Triad Triad ~ Descending Triad ~ Glides 8 Note ~ Chromatic 5 Tone 5 Tone ~ 3 times 5 Tone ~ Descending 5 Tone ~ Descending Ascending 5 Tone ~ Broken Thirds 5 Tone ~ Long Scale 5 Tone ~ Descending Long Scale 5 Tone ~ With Gallop Sixth Jumps Sixth Arpeggio Sixth Arpeggio ~ With Repeat 6 Tone ~ With Repeat 6 Tone ~ Long Scale Pentatonic Pentatonic ~ Descending Pentatonic ~ Variation I Pentatonic ~ Variation II Selve Amiche Octave Jumps One Octave Scale One Octave Scale ~ Broken Thirds One Octave Scale ~ Descending Voce Cuperto ~ One Octave Arpeggio Arpeggio ~ With Glides Arpeggio ~ With Repeat Arpeggio ~ With More Repeat Arpeggio ~ 2 times Arpeggio ~ With Skips Arpeggio ~ Descending Arpeggio ~ Descending Glides Arpeggio ~ Descending Ascending Queen of the Night Arpeggio ~ With a Turn Scale to the Ninth Tenth Scale Tenth Scale ~ Glides Tenth Scale ~ Descending Tenth Scale ~ Descending Ascending Tenth Scale ~ With Repeat Diatonic Third Jumps Diatonic 3 Tone Scale To The 11th Scale To The 11th ~ With Repeat Scale To The 11th ~ Groppo Scale To The 11th ~ Variation Queen of the Night (A coloratura pattern from Mozart's aria) Rossini Scale Rossini Scale ~ With Gallop Jazz Run Voce Cuperto ~ 1 ½ Octave Diatonic Triads Diatonic 5 Tone Voce Cuperto ~ Two Octave 2 Octave Scale ~ Descending ...and more.

Screenshots

Ops Clock4 screens
Bel Canto Serioso4 screens

Verdict

The call

The clearest difference is review sentiment: Ops Clock at 100% against Bel Canto Serioso's 25%. Ops Clock also leads on price (Free vs $4.99) and rating (4.7 vs 3.7). On ads, in-app purchases, 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

CostPrice · In-app purchases · Ads · Monetization

Ops Clock is free to download; Bel Canto Serioso costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Ops Clock holds the better App Store score, 4.7 against 3.7. Both are backed by a comparable volume of ratings — 11 and 3 respectively. Written reviews point the same way: 100% of Ops Clock's written reviews are positive against 25% of Bel Canto Serioso's.

UpkeepUpdate frequency

Ops Clock ships an update every 5 months, Bel Canto Serioso every 31 months. The most recent releases landed on August 25, 2026 and September 10, 2026 respectively.

Scorecard6 real differences · 4 level
Ops Clock versus Bel Canto Serioso: the parameters behind the verdict, then further details
ParameterOps ClockBel Canto Serioso
PriceFree — better$4.99
Rating4.7 (11 ratings) — better3.7 (3 ratings)
Positive reviews100.0% of reviews — better25.0% of reviews
Number of ratings11 — better3
Update frequencyEvery 5 months — betterEvery 31 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better16
Further details — not scored
Size2 MB3 MB
Age rating4+4+
DeveloperJames KretchmarAltug Basaran

Customer experience

Ops Clock

All ratings11 ratings
Positive90.9%
Neutral0.0%
Negative9.1%
Written reviews6 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bel Canto Serioso

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews4 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

In-app purchases

None

Ops Clock

No in-app purchases

None

Bel Canto Serioso

No in-app purchases

Questions

Is Ops Clock free?
Ops Clock is free to download, with no in-app purchases.
Is Bel Canto Serioso free?
Bel Canto Serioso costs $4.99, with no in-app purchases.
Which has better reviews, Ops Clock or Bel Canto Serioso?
Ops Clock is rated higher. Ops Clock averages 4.7 out of 5 from 11 ratings, while Bel Canto Serioso averages 3.7 from 3 ratings.
Do Ops Clock or Bel Canto Serioso have ads?
Neither Ops Clock nor Bel Canto Serioso shows ads.
Which is updated more often, Ops Clock or Bel Canto Serioso?
Ops Clock ships an update every 5 months, and Bel Canto Serioso every 31 months. Most recently, Ops Clock was updated on August 25, 2026 and Bel Canto Serioso on September 10, 2026.

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