Comparison

On vs FonFon

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

Head to head
About

On

Features
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On-Key transcends being merely a virtual piano app - it's an inclusive musical universe! With its unique approach, it provides a welcoming environment for all aspiring musicians. Carefully chosen colors ensure visual comfort, and the clear, readable interface caters to a wide range of users. Dive into interactive lessons, refine your skills, and explore a vast musical repertoire. Whether you're a curious beginner or a seasoned enthusiast, On-Key adapts to your pace, offering support and encouragement with every note. Discover the magic of barrier-free music, join a vibrant community, and embark on your musical journey today. Download On-Key and let the music guide your inspiration, where everyone has a place to play and express themselves. Developed by Julia Gusmão, Luana Thomas, Matheus Venturini, Nathan Schostack and Pedro Muller.

About

FonFon

Features
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Uma aventura onde cada som é uma nova descoberta! Neste app, crianças exploram um mundo cheio de ilhas, brincadeiras e desafios criados para tornar a prática dos sons da fala mais divertida e envolvente. Cada ilha representa um som diferente e traz atividades lúdicas que incentivam a criança a ouvir, observar, repetir e brincar com os sons e palavras. Tudo acontece dentro de um universo colorido, acolhedor e pensado especialmente para crianças, com instruções simples, elementos visuais e atividades curtas que estimulam a participação de forma leve e divertida. O app foi pensado para que a criança consiga explorar as atividades com mais autonomia. Com instruções simples, elementos visuais, demonstrações e interações intuitivas, ela pode entender o que fazer, avançar pelos desafios e acompanhar suas conquistas durante a jornada. Assim, a prática pode acontecer de forma mais independente e divertida, respeitando o ritmo de cada criança e incentivando sua participação ativa nas atividades.

Screenshots

On3 screens
FonFon4 screens

Verdict

The call

On and FonFon are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 5 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

ScorecardNo meaningful differences
On versus FonFon: the parameters behind the verdict, then further details
ParameterOnFonFon
PriceFreeFree
Update frequencyEvery 5 daysEvery 5 days
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 — better17.6
Further details — not scored
Size408 MB452 MB
Age rating4+4+
DeveloperLuana ThomasMarcos Vinicius Cagnin Raach

In-app purchases

None

On

No in-app purchases

None

FonFon

No in-app purchases

Questions

Is On free?
On is free to download, with no in-app purchases.
Is FonFon free?
FonFon is free to download, with no in-app purchases.
Do On or FonFon have ads?
Neither On nor FonFon shows ads.
Which is updated more often, On or FonFon?
On ships an update every 5 days, and FonFon every 5 days. Most recently, On was updated on October 30, 2026 and FonFon on October 31, 2026.

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