ERG for iOS
by Pipeline and Hazardous Materials Safety Administration
- Reference
- Free
- Small & simple · 72
- Rating
- 4.4
- 11 ratings
- Top 67%among 36 Reference apps
- Last update
- Oct 30, 2024
- Version 4.1.1
- Size
- 28 MB
- Category
- Reference
- Tracked since
- Oct 9, 2026
Estimated revenue
A model estimate with a likely range, not a reported figure.
No estimate. Apps outside the grossing charts, and some countries, have no reliable rank-to-revenue curve, so we show nothing rather than a guess.
How this estimate is made
Rank: we take the app's best Top Grossing rank on the latest chart day. Category ranks are converted into an equivalent overall rank, because a #10 in Finance earns far less than a #10 overall.
Curve: that equivalent rank is read off a rank-to-revenue curve anchored on public company revenue and market-data reports for the US iPhone App Store.
Country: the curve is scaled per country (Japan is roughly a third of the US, Türkiye under 1%). Where we have no scale, such as China, there is no estimate.
Range: the likely range widens with country, category and chart depth. It is a plausible span, not a statistical confidence interval.
Not included: ads, payments outside the App Store, and any difference between gross sales and what the developer keeps. Low confidence means indirect data; medium means several independent sources agree.
Full methodScreenshots
As shown on the App Store listing.
About this app
Text from the App Store listing.
PHMSA’s Emergency Response Guidebook (ERG) is the go-to resource for first responders during the initial phase of a dangerous goods or hazardous materials transportation incident.
The ERG app is a valuable companion, based on the latest edition of the ERG, to help responders quickly access critical information at their fingertips. The app features an indexed list of dangerous goods, including their associated ID number, general hazards, and recommended safety precautions.
In practical scenarios, such as responding to an overturned tractor trailer displaying a DOT hazmat placard, emergency responders can use the app to quickly identify the material associated with the placard and get guidance on how to respond effectively.
Full versions available in English, French, and Spanish.
What’s new
Release notes for the latest version, as written by the developer.
Bug fix related to distance alerts on the map
Rank history
Daily position in the Canada charts. #1 is at the top.
- Best rank
- #46
- Current rank
- –
- Days charting
- 4 of 7
Not charting today
On the charts today
Not on any Canada chart today.
Small & simple score
How realistic it is for a small team to build something like this.
72/100
Small & simple
- Developer size70% · 25
Developer: 2 apps on the charts
- Audience size100% · 20
Ratings: 11
- App size100% · 10
Size: 28 MB
- Price model10% · 15
Price model: free
- Demand proof75% · 30
Best rank #19, 39 countries
An indicator, not a fact. We can't see team size. Calculated Oct 25, 2026 · method i2
How the score worksVersion history
- 4.1.1LatestReleased Oct 30, 2024