Free tools
Small utilities we built because we needed them. They run entirely in your browser — no signup, no email capture, no ads, and nothing you type is sent anywhere.
TDEE & macro calculator
Runs Mifflin-St Jeor, Harris-Benedict and Katch-McArdle side by side and shows the working — so you can see why every calculator gives you a different number.
Nutrition · pairs with GO AI CalorieAI token counter & cost estimator
Paste text to estimate tokens, check whether it fits a context window, and work out cost at your own API rates. Honest about where the estimate is weak.
Developers · pairs with NeurobaseWhich AI model should I use?
Pick your task, get a recommendation and the reasoning behind it. GPT-5, Gemini, Grok 4 and DeepSeek, judged from daily side-by-side use.
AI users · pairs with GO AI ChatApp Store storefront checker
Search any country's App Store, or compare one app across fifteen markets at once — localized titles, prices, ratings, availability.
ASO & app developersWhy these are free
We build AI apps, and each of these tools solves a problem next to one of them: working out a calorie target, sizing a document for a model, choosing between models, checking how a listing looks in another country. If a tool is useful you might look at the app it relates to — that's the whole business model, and there's no step where we ask for your email first.
Everything is client-side. There's no backend on this site, so there's nowhere for your inputs to go even if we wanted them.
Something wrong, or a tool you'd want? support@goaichats.com.