IQ Test vs Siren's Spellbook
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
IQ Test
Measure your intelligence quotient (IQ) with a professional, culture-free testing method. Discover your intellectual age, compare yourself to celebrities, and manage results for personal or professional use. Get detailed explanations and review errors to understand your cognitive abilities.
- Culture-free IQ testing method
- Determine intellectual age
- Compare IQ to celebrities
- IQ score from 50 to 160
- Test friends and family
- Database of results
- Review response errors
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Also, you may find out that you belong to 2% of people with the highest IQ level. Let’s find out our intellectual age and measure our IQ level (Intelligence Quotient)! IQ pro is a professional application that implements the culture-free testing method of IQ level that is based on R. Cattell. Experts consider this method as one of the most accurate and reliable in the world. The test results do not depend on your knowledge, experience, culture, or nationality. Using this application you can: - Get tested your IQ level with detailed explanations and instructions. - Find out your intellectual age. - Find out who of celebrities is closer to your IQ. - Get the result in a form of number from 50 to 160, which is your IQ. - Test also your friends and relatives. - Manage a convenient database of results (for professionals: psychologists, human resource managers, and so on). - Review the response errors after testing is completed. - Use this application to test new employees for a job. Please, read FAQ in the application to find out how you can use the testing in the real life. Also, write your feedback about the application in the AppStore and get an additional testing for free.
Siren's Spellbook
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Siren’s Spellbook is the singers' companion for learning scales, modes, solfège, audiation, and the moods and characters of the Classical Modes, using the timeless Kodály inspired approach. The app helps singers study not only how of the Classical Modes sounds, but also how each parent scale and rotation feels, functions, and is traditionally named. Inside the free companion app for iPhone and iPad you can: • Hear scale demonstrations and technical studies of every scale with accurate tempo-based playback. • Learn to recognise and use the archetypal mood and character of the parent-scales and modes and use them in your singing and composition. • Learn the construction of character and mood archetypes, showing how interval tendencies combine into more complex modal identities. • Practice with a built-in metronome synced to the selected BPM. • Explore parent scales and modal rotations across pentatonic, diatonic, harmonic, melodic, neapolitan, double harmonic, Hungarian minor, whole-tone, augmented hexatonic, diminished octatonic, and chromatic families. • Access reference pages for Western modes and Carnatic/Karnataka pitch-set equivalents. • Sing the scales using the movable-Do solfège with chromatic alterations, octave markers, and a parent-relative rotational logic inspired by Kodály pedagogy. • Learn to use the Curwen hand signs to assist with visually and kinaesthetically anchoring the intervals with the solfège. The app is designed differently for each device: • On iPad, the complete Siren's Spellbook sheet music for all scales and modes is included with full workbook page viewing and inline playback controls as an IN-APP FULL SHEET MUSIC PURCHASE. • On iPhone, it works as a practical singing companion to the physical version of Siren's spellbook, which is available to purchase separately. The companion app has fast playback buttons for the exercises, making it easy to use alongside the physical book. The iPhone app does not include the sheet music, even with the full sheet music purchase. It is audio only. Siren’s Spellbook is especially useful for: • singers studying solfege and audiation • students learning modal colour and function • teachers working with Kodaly-inspired training • anyone wanting a deeper, more expressive understanding of scales and modes If you want to move beyond memorising note patterns and start hearing the inner character of each modal family, Siren’s Spellbook offers a structured and musical path into modal practice.
Screenshots
Verdict
The clearest difference is ads: Siren's Spellbook at none against IQ Test's shown. Siren's Spellbook also leads on update cadence (every 2 weeks vs every 2 months). IQ Test's advantage is iOS requirement (13.0 vs 17.0). On price, 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
Both are free to download. IQ Test sells 3 one-off in-app purchases and Siren's Spellbook sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
IQ Test ships an update every 2 months, Siren's Spellbook every 2 weeks. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.
| Parameter | IQ Test | Siren's Spellbook |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (2.9K ratings) — better | — |
| Positive reviews | 63.4% of reviews | — |
| Number of ratings | 2.9K — better | — |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 83 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | Games for Friends LLC | Jordan Collin |
Bugs and requests
IQ Test
Reported bugs
3 issues- Issues with entering date of birth and age
- Inability to access additional tests after purchase
- Confusing navigation and hidden costs
Requested features
4 requests- Offer more varied question types beyond just pattern recognition
- Provide explanations for correct answers
- Allow users to pause and resume the test
- Include sections to test different types of intelligence
Siren's Spellbook
Not enough reviews yet to summarise bugs or requests.
In-app purchases
IQ Test
- Buy 10 testings$0.99
- Buy 100 testings$1.99
- Unlock unlimited mode$2.99
Siren's Spellbook
- Siren’s Spellbook iPad Sheet Music$14.99
Questions
Is IQ Test free?
Is Siren's Spellbook free?
Do IQ Test or Siren's Spellbook have ads?
Which is updated more often, IQ Test or Siren's Spellbook?
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