Free tools for app makers
Work out your app rating, reply to reviews, sort feedback, score your NPS and find your next app idea. Every tool is free.
App Rating Calculator
See how many 5-star ratings it takes to reach your target, and what one 1-star rating costs you.
Open the toolReview Reply Generator
Paste a review, pick a tone and get 3 polite reply drafts you can copy.
Open the toolFeedback Analyzer
Paste up to 50 comments. See the mood, the top themes and what needs a reply today.
Open the toolNPS Calculator
Enter counts or paste 0 to 10 scores. Get your Net Promoter Score with the math shown.
Open the toolApp Ideas from Reviews
Browse what real users ask for in each app category, and the gaps nobody fills yet.
Open the toolFree App Teardown
Paste any App Store link. See what users love, hate and want, from the app's latest reviews.
Get a teardownNo signup needed
Open a tool and use it. The calculators run right in your browser, so you get the answer as you type.
We don't keep your text
The reply generator and the feedback analyzer don't save what you paste. They use it once and forget it.
Math you can check
Every calculator shows its formula and a worked example. You can check each step by hand.
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Synthiya tracks your reviews and customer feedback, tags every item with AI and tells you what to fix next.