Your Compass to TRUE NAAD.


Just a bit Flat. Sing higher☝️

A tad Sharp. Sing lower👇

Perfectly hit! Good Job 👌

Perfectly Sustained! Kudos 👌

Progress Report.

Pitch and Gandhar Tuned 🎹.



Created by Sandeep Ranade 'Naadrang', a Hindustani Classical Singer, Guru and Technologist, NaadSadhana, an iOS app, helps you attain perfect notes. This unique app provides real-time biofeedback to help you increase both vocal and aural resolution over time.


The Human voice is very different from instruments in aspects such as note stability, timber, and resonance. NaadSadhana uses advanced algorithms to focus on the
singing and ignore speech and other background sounds.


Gandhar Tuning is an ancient system based on an accurately tuned Tanpura's 'Swayambhu Gandhar'. The ratios used in this tuning are different from Equi-Tempered ratios and NaadSadhana helps you achieve these with perfection.


With elegant visual guidance, NaadSadhana guides you swiftly to the perfect note. Even when the ear can't differentiate between subtle microtones, the brain can learn to do so with appropriate biofeedback.
Both vocal and aural perfection is achieved with continuing practice.


NaadSadhana calculates a score for your singing which is a measure of how quickly and how long you can sustain notes accurately after hitting them.
The Statistics tab shows current score as well as how
you re doing over time.


Based on the psycho-acoustic concept of 'Just Noticeable Difference', NaadSadhana offers three levels of difficulty when judging notes to be perfect. Over time, as you gain precision in sustaining notes at one level, you can challenge yourself by moving up to the next level.


Suyog Kundalkar

Renowned Harmonium Artist, Tuning Expert, Singer & Composer, Pune.

"This App is an absolute must for self-practice of Swar in an age where one can’t possibly spend 24 hours with a Guru. A very natural, easy to use, apt, and technologically advanced App for students and experts alike!"

"माझा मित्र आणि मेवाती घराण्याचा गायक संदीप रानडे याने 'नादसाधना' नावाचे App तयार केले आहे. आजच्या काळातील संगीत शिक्षण व्यवस्थेस सहायक म्हणून या App चा संगीत शिकणाऱ्या विद्यार्थांना, प्रगत अवस्थेतील गायकांना तसंच कलाकारांनाही नक्कीच उपयोग होईल. आजच्या काळात २४ तास गुरुंचं सान्निध्य मिळणं ही गोष्ट अवघड आहे. त्यामुळे घरी स्वराभ्यास करताना ह्या App च्या मदतीने विद्यार्थांना स्वतःला तपासून पाहता येईल.

संदीप स्वतः Software Engineer असल्यामुळे त्याने तांत्रिकदृष्ट्या हे App अतिशय सहज-सोपं आणि चोख बनवलं आहे ज्यात प्राथमिक अवस्थेपासून उच्चतम श्रेणीतील विद्यार्थी-गायकांना ह्याचा वापर करता येईल. मी ह्या निर्मितीबद्दल संदीपचं अभिनंदन करतो आणि मनापासून शुभेच्छा देतो."

Milind Vasudeo Kulkarni

Renowned Harmonium Artist, Tuning Expert & Composer, Pune.

"The NaadSadhana App is a must-have for students, performers and harmonium players as a gold-standard reference for precise notes. A great addition to the tradition of Hindustani Classical Music by Sandeep Ranade!"

"माझा मित्र, संदीप रानडे, यानी नुकतेच नादसाधना हे App तयार केले आहे ज्याच्या द्वारे तुम्ही स्वतःच्या सुरांचा नेमका अभ्यास करू शकता. घरात बसून तुम्हाला रियाज करताना नेमके सूर कसे लावायचे, कसे लागतायेत, किती चढतात, किती उतरतात या सर्वांची माहिती Appमधून मिळते ही खूप मोठी गोष्ट आहे. त्याचबरोबर हार्मोनियम वादकांसाठी पण हे App खूप उपयोगी आहे. हार्मोनियम ट्युनिंग करताना एक Reference म्हणून हे App नक्कीच मार्गदर्शक ठरेल.

शास्त्रीय संगीताच्या परंपरेमध्ये खूप मोठी, चांगली  व गरजेची उपलब्धी संदीप नी केली आहे ह्याबद्दल मी संदीप चे खूप अभिनंदन करतो. सर्व संगीताच्या विद्यार्थ्यांनी व कलाकारांनी ह्या App चा लाभ जरूर घ्यावा आणि App द्वारे सुरांची ओळख करून घ्यावी म्हणजे भविष्यामध्ये सुरांचा काहीही प्रॉब्लेम येणार नाही."


Aarshin Karande

Marketing & Design @ PeopleFirm, Seattle.

"NaadSadhana is simple, smart, super-easy and surreal. Art, philosophy, science, and technology at its best!"

Jay Gokhale

Software Engineer @ Index, San Francisco.

"This app is kind of like having the ears of seasoned pro. A simple and powerful feedback loop!"

Chitra Desai

Homemaker, Student of Music, Pune.

"Simple but Smart, an essential app for Naad Sadhaks.
Gently guides you to perfection.
The Perfect Guru that's always with you!"

Shreedhar Ganapathy

Engineering Director @ Financial Engines Inc, Sunnyvale.

"NaadSadhana brings back the gurukul style education by being a virtual guru for beginners and experts."

Uma Phadke-Datar

Graduate Student, Taxation, California.

"The app is an eye-opening reality check. You clearly see your strengths, weaknesses and rate of growth at a glance. It aims at helping you achieve great precision of notes while singing. Indeed, a delight for singers!"

Jay Banerjee

Senior Program Manager, Premier Inc, North Carolina.

"Within a couple of weeks of practicing with the NaadSadhana App, I saw great improvements in my pitch, breath control, tonal quality, resonance and overall sound production. I highly recommend this app to help you evolve endlessly!"

Rohit Achyarya

Senior Manager @ P&G, Mumbai.

"Groundbreaking app for Singers. Brings you closer to Melodic Perfection."

Ujjwal Parikh

Software Engineer @ Cisco, Boston.

"Intuitive Interface, very easy to use. A very effective tool for Singers."


NaadSadhana works best alongside tanpura apps like iTablaPro. You simply turn your tanpura on, connect headphones or a bluetooth speaker and open the NaadSadhana app. Make sure the scale and fine tuning are the same as your iTablaPro settings. You are ready to sing! Go to the tuner tab and start singing. The app will tell you how high or low your note is. If you hit the perfect note, the circle turns green. If you sustain the note correctly, it turns a fat green and the small triangle turns orange.

A lot of factors influence the rate of improvement, such as how long one has been singing, old habits, concentration and the quality, consistency and duration of practice. For most people though, consistent half-hour practice every day ought to improve their note accuracy perceptibly in a few weeks. You can use the statistics tab in the app to track how your score improves over time.

The human voice cannot be expected to hold a note perfectly at a given frequency the same way an instrument can. There are always lesser or greater fluctuations in the note. You can train your brain and voice to get more accurate by reducing these fluctuations. The higher the level, more accurate the note is expected to be. In fact, at the Expert level, the fluctuations are no longer noticeable to the average human ear.

22 Shruti Tuning is a ancient, sophisticated, microtonal system of tuning. In every octave, there are 7 Swars. Of these, 2 are ‘Achal’ or ‘Immovable’ - Shadja (Sa) and Pancham (Pa). The remaining 5 notes (Re, Ga, Ma, Dha and Ni), called ‘Chala’ or ‘Movable’ Notes, have two variants each - a low and a high. This is how we get the 12 notes (5*2 + 2) in an octave. But, in a 22 Shruti system, each of 10 ‘Chala’ notes are further subdivided into 2 Shrutis - a low and high variant, giving a total of 22 (2*10 + 2) Shrutis. Thus for each of the 5 Notes (Re, Ga, Ma, Dha and Ni), we have 4 variants: low-low (Ati-Komal), low-high (Komal), high-low (Shuddha) and high-high (Teevra). For each of the 10 ‘Chala’ notes, there is a region of movement that is allowed in Hindustani Classical Raga Music which demarcated by its corresponding two Shrutis. This region is conspicuously missing for Sa and Pa, which are fixed points in the octave. The difference between consecutive Shrutis is very small and requires years of training.

Gandhar Tuning is a tuning system based on the concept of the ‘Swayambhu’ (Self Manifested) Gandhar found in a perfectly tuned Tanpura. It is a system of 12 notes where there is a self-consistent relationship between notes. These 12 notes are a subset of the 22 Shrutis. In Gandhar Tuning, all the Shuddha Notes are tuned precisely using the Shadja :: Swayambhu-Gandhar :: Pancham ratios. Sa :: Ga :: Pa, Ma :: Dha :: Sa and Pa :: Ni :: Re are all the same ratios. Once the ratios of Shuddha notes are fixed using the above relationships, one can extend them to find the ratios of the remaining Komal and Teevra notes. Only when Gandhar Tuning is mastered, is it possible to master the 22 Shrutis.

Equal Temperament is an invention of Western Music that enables playing chords in many scales. Since a Gandhar / 22-Shruti Keyboard cannot be used for any other pitch than it was originally tuned for, these can’t be used for chromatic melodies that span multiple pitches. Equal Tempered Notes split the octave in 12 ‘Equal’ parts. Now, the frequencies in an octave follow a power of two relationship, i.e. a note in the higher octave is 2 times the frequency of the same note in a lower octave. This means that the 12 parts are not at equal frequency intervals. Rather, ratios of subsequent notes are a ‘12th root of 2’ factor apart. This is an irrational number and every single note except Sa has an irrational and therefore dissonant ratio. Additionally, only ratios that are simple rational fractions are harmonic with the Sa. Sa-Ga-Pa, Ma-Dha-Sa and Pa-Ni-Re chords (major chord) on an Equi Tempered keyboard are somewhat dissonant, while on a Gandhar Tuned / 22-Shruti keyboard, they are beautifully consonant. Equi-Tempered Tuning should be only used for multi-pitch melodies and is unsuitable for Hindustani Classical Music.

Please email us at naadsadhana at sandeepranade dot com. We look forward to hearing from you!

Unfortunately, an Android version is not on the roadmap as of now. Apple's digital signal processing unit is remarkably well designed, has very low latency and makes all the heavy computation and complex algorithms like signal processing, fundamental frequency detection, or note analysis possible. We hope Android brings feature parity in its sound stack soon.

© Copyright 2018 Sandeep D. Ranade.