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I need Coins or any other currency to have an app running on a blockchain?
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Yes.
The blockchain itself is like a mere database, maybe it’s the worst database of all.
However, a database does not "run" an application. Typically the other way around, an application consumes it. This is exactly what happens to most currencies, like Bitcoin, mentioned by you.
Bitcoin only records transactions, these transactions need to be "accepted" by miners. They are responsible, through a proof of work, for including their transaction in the blockchain. Each transaction’s fees must be paid.
The value of the fees depends on the size of the transaction. The transactions include various information, the inputs (unspent transactions), or outputs (the recipient) and the signature (the cryptographic signature), etc. The more information there is, the more expensive it will become.
One way to store arbitrary content in the blockchain is by using the OP_RETURN, in Bitcoin it is limited to 60 bytes. There are currencies that have no limit or larger limits, or other specific features.
Each currency has its own cost and confirmation time, this should also be considered. At this same point, each currency has its own blockchain. You have to have the respective currency, if you are going to use the Dash blockchain, you have to have Dash (and not bitcoin). You should also look for "strong" currencies, after all any blockchain is vulnerable to a 51% attack and if the currency is "discontinued", your data will be lost.
There are other currencies, such as Ethereum, which allows you to run an application using Dapp. However, it is also not free. You will have to pay the Gas so that it "turns".
You don’t necessarily need to insert everything into the blockchain, doing so would create multiple transactions and spending multiple currencies on fees. You can insert only a hash, originated from a hash-Tree. Thus, you will be able to check the integrity of multiple data, just with a hash.
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