Hello,
Zoho invoice free is adding Zoho ad (sent by information) to outgoing email subject even if email body have "powered by" information.
This is very bad commercial promotion because is no one can prefer to use it in this way.
Free version is very limited, on the other hand standard plan very expensive. Why?
Basic plan is not good option because of 50 contact 1User limitation.
Standard plan seems very good but cost is 150 USD per year so 550 Turkish liras because of exchange rate difference.
Please reconsider about free plan limitations and standard plan cost.
Every startup and company needs to invoice and quote solution in market and Zoho have great applications/solutions but you should rethink about how you can increase the free plan usage generally. Then Zoho will have a good brand awareness in market.
It can be good example for you.
Best regards
Emre