# Synstax

> Synstax is an iOS app for checking supplement interactions before you take them. It checks supplement-supplement interactions, diet effects, timing gaps, and label ingredients using 5,142 combination rules, 337 diet-supplement rules, RDI/UL intake insights, AI-powered OCR label scanning, and smart scheduling. Free with optional Pro subscription.

Synstax is developed by Uppervoid. It is available on the App Store for iPhone (iOS 17+) in 34 target localizations, including English, Chinese (Simplified & Traditional), German, French, Japanese, Korean, Spanish, Portuguese (Brazil & Portugal), Italian, Russian, Arabic, Turkish, Polish, Vietnamese, Thai, Indonesian, Malay, Hindi, Dutch, Catalan, Czech, Danish, Greek, Finnish, Hebrew, Croatian, Hungarian, Norwegian, Romanian, Slovak, Swedish, and Ukrainian.

## What Makes Synstax Unique

- **5,142 supplement combination rules** sourced from NIH, FDA, and peer-reviewed research — not AI-generated guesses
- **Diet-supplement interaction tracking** — the only app that checks how foods (caffeine, grapefruit, dairy, alcohol, etc.) affect supplement absorption
- **RDI & Upper Limit intake monitoring** — tracks daily intake against scientific recommended limits across stacked products
- **AI-powered label scanner** — OCR reads any supplement label from any country, matching against 1,185 active ingredients with 12,000+ name variants
- **No account required** — all data stored locally on device, works offline

## Core Features

1. **Combination Checker**: Detects interactions between supplements with severity levels and timing recommendations
2. **Diet Insights**: 337 diet-supplement rules across 8 food categories (caffeine, tea, alcohol, dairy, fiber, grapefruit, spicy food, soy)
3. **Intake Tracking**: Monitors daily nutrient intake against RDI and Upper Limit thresholds
4. **AI Analysis & Chat**: Product ratings, brand insights, ingredient chat — 30 free queries/month
5. **Label Scanner**: Point camera at any supplement label for instant ingredient extraction
6. **Smart Schedule**: Organize supplements by morning, noon, evening, bedtime with optimized timing

## Pricing

- Free: Full scheduling, combination detection, diet tracking, label scanning, 30 AI queries/month
- Pro Monthly: $4.99/month — unlimited AI analysis & chat
- Pro Annual: $29.99/year — unlimited AI, best value

## Links

- [Homepage](https://synstax.uppervoid.app/)
- [App Store](https://apps.apple.com/app/id6760453147)
- [Support](https://synstax.uppervoid.app/support)
- [Privacy Policy](https://synstax.uppervoid.app/privacy)

## Supplement Guides

- [Can You Take Calcium and Iron Together?](https://synstax.uppervoid.app/blog/can-you-take-calcium-and-iron-together): Detailed guide on calcium-iron interaction, timing recommendations, and absorption tips
- [Best Supplement Interaction Checker Apps in 2026](https://synstax.uppervoid.app/blog/supplement-interaction-checker): Comparison of supplement interaction checking tools
- [Best Time to Take Supplements](https://synstax.uppervoid.app/blog/best-time-to-take-supplements): Science-backed guide to optimal supplement timing