I would encourage you to start charging customers or to find another monetisation strategy for it, unless youre getting mmassive traction you arent a aquisition target and if its nice but free then it may never make money.
It's still early days and I'm more focused on growing the user base right now.
Saying that, since last month I put a daily cap on phrase translations for free users and a 'Readlang Supporter' plan at $10 / year for unlimited translations and to support development through the beta period. So far I've had 13 payments, a total of $130, which I'm pretty happy with since a) the user base is currently small (about 500 signed up since I added the payment option), b) it's validation that people are willing to pay for the service, and c) I've got a lot of ideas for improving it in future.
Saying that, since last month I put a daily cap on phrase translations for free users and a 'Readlang Supporter' plan at $10 / year for unlimited translations and to support development through the beta period. So far I've had 13 payments, a total of $130, which I'm pretty happy with since a) the user base is currently small (about 500 signed up since I added the payment option), b) it's validation that people are willing to pay for the service, and c) I've got a lot of ideas for improving it in future.