# Chemdata vs Thermit Lookup

The clearest difference is review sentiment: Thermit Lookup at 100% against Chemdata's 67%. Thermit Lookup also leads on update cadence (every 3 months vs every 19 months) and iOS requirement (7.0 vs 14.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Chemdata ships an update every 19 months, Thermit Lookup every 3 months. The most recent releases landed on October 21, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Chemdata | Thermit Lookup |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 49 MB | 12 MB |
| Requires iOS | 14.0 | **7.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Ricardo-AEA ltd](https://appshunter.io/developer/691094634) | [Jonathon Matthews](https://appshunter.io/developer/965800107) |

## What reviewers say

### Chemdata

[App page](https://appshunter.io/ios/app/chemdata/id849758854)

Access a comprehensive chemical hazard database offline for incident management. Provides detailed information on over 62,000 chemicals, including safety, transport, and emergency response guidance. Offers multilingual support and regular updates.

**Highlights:** Offline chemical database access, Hazardous chemical identification, Incident command support, Transport classification, Personal Protective Equipment (PPE) guidance, Multilingual support (EN, NL, FR, DE, ES)

**Features:** macOS Compatibility

**In-app purchases:** none


### Thermit Lookup

[App page](https://appshunter.io/ios/app/thermit-lookup/id965800108)

This app serves as a quick reference for thermit welders and planners. It provides essential parameters and timings for alumina-thermic welding processes based on selected rail sections, grades, welding processes, and fuel gases. It also offers direct links for ordering supplies and technical support.

**Highlights:** Select rail section, grade, process, and fuel gas, Displays key welding parameters, Provides process timings, Links to company website for orders, Includes Head Office telephone number, Automatic database syncing, Offline functionality

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Chemdata free?

Chemdata is free to download, with no in-app purchases.

### Is Thermit Lookup free?

Thermit Lookup is free to download, with no in-app purchases.

### Do Chemdata or Thermit Lookup have ads?

Neither Chemdata nor Thermit Lookup shows ads.

### Which is updated more often, Chemdata or Thermit Lookup?

Chemdata ships an update every 19 months, and Thermit Lookup every 3 months. Most recently, Chemdata was updated on October 21, 2026 and Thermit Lookup on October 29, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*