About Slate
Slate is a calorie journal for iPhone, made by Sonal Systems Private Limited, a company in Vadodara, India. You type what you ate the way you'd say it, and Slate puts a number next to it. It works for food from anywhere, and it has a detailed catalogue of Indian home cooking.
Who makes Slate?
Slate is made by Sonal Systems Private Limited, founded in 2026 by Nirmal Amin and Nehal Modi. Nirmal writes the articles on this site.
Sonal Systems Private Limited is registered in India (CIN U62099GJ2026PTC179785). The office is at A-3, Mehsana Nagar, Nizampura, Vadodara 390002, Gujarat.
What is Slate built on?
- Calories come from recipes in grams and national food composition tables: USDA FoodData Central (United States), CoFID (United Kingdom) and IFCT 2017 (India). How Slate counts calories shows the arithmetic.
- AI only reads lines Slate doesn't recognise, spots dishes in photos and powers chat. It never produces a calorie number, and your Slate isn't used to train AI models.
- There's no login. Everyone's data is stored in Mumbai, India, wherever you live. The privacy policy has the details.
- Slate is free forever. Slate Plus is optional, at $4.99 a month or $34.99 a year (£4.99 and £34.99 in the UK, ₹399 and ₹2,999 in India). The App Store shows the price in your currency.
- Slate is not medical advice, and it's for people 18 or older.
How do I reach the people behind Slate?
Write to support@writeonslate.com for help, feedback or questions about your data. Support answers the common questions.