Comparison

e vs Subsurface Maps Offline

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

e

This tool allows water quality professionals to collect, manage, analyze, and track water quality test parameters. It is designed for water treatment facilities and professionals in the field.

Highlights
  • Water quality data collection
  • Data management
  • Analysis of test parameters
  • Tracking of water quality
  • Designed for professionals
  • Supports water treatment facilities
Features
Read full description

The e-sens ROAM app is a free water quality collection tool to gather, manage, analyze and track all your water quality test parameters. Built for Water quality professionals and water treatment facilities.

About

Subsurface Maps Offline

Access and edit your maps offline on your iOS device. Download maps from the cloud, make changes, and mark new points. Sync your edits back to the cloud for team access.

Highlights
  • Download maps for offline use
  • View and edit map features
  • Mark new points
  • Sync changes to the cloud
  • Turn map layers on/off
Read full description

Subsurface Maps Offline is an app that allows existing Subsurface Maps users to download their maps from the cloud to their iOS device for use offline. Using this app you can view your map, turn layers on and off, make changes to any feature, and mark new points. Then when you are back at the office you can use the "Sync" button to upload your changes to the Subsurface Maps cloud where they will be accessible to the rest of your team. The regular browser-based Subsurface Maps application is still the flagship product where you must go to create layers, change colors, modify your field layout, draw lines, etc. The offline app is a less functional version that allows you to do basic data collection and viewing offline. How it works 1. These instructions assume you already have a Subsurface Maps account. 2. Install this app on your tablet or phone. 3. Run the app and enter your Subsurface Maps user name and password. 4. Select which map(s) you want to download to your phone/tablet. 5. Open your map, view it, make changes, add new points, etc. 6. When you are ready to upload your changes click Menu, then click Offline Maps, then click the 'Sync' button next to your map name. This will upload your edits and download any changes that others have made.

Screenshots

e4 screens
Subsurface Maps Offline3 screens

Verdict

The call

The clearest difference is monetization model: Subsurface Maps Offline at free against e's ad-supported. Subsurface Maps Offline also leads on update cadence (every 4 weeks vs every 2 months). On price, rating, ratings volume and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for e against 5.0 for Subsurface Maps Offline. Both are backed by a comparable volume of ratings — 3 and 2 respectively.

UpkeepUpdate frequency

e ships an update every 2 months, Subsurface Maps Offline every 4 weeks. The most recent releases landed on September 19, 2026 and September 16, 2026 respectively.

Scorecard2 real differences · 7 level
e versus Subsurface Maps Offline: the parameters behind the verdict, then further details
ParametereSubsurface Maps Offline
PriceFreeFree
Rating5.0 (3 ratings)5.0 (2 ratings)
Number of ratings3 — better2
Update frequencyEvery 2 monthsEvery 4 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationAd-supportedFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size32 MB81 MB
Age rating4+4+
Developere-sens, Inc.Ben Hill

Customer experience

e

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Subsurface Maps Offline

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

e

No in-app purchases

None

Subsurface Maps Offline

No in-app purchases

Questions

Is e free?
e is free to download, with no in-app purchases.
Is Subsurface Maps Offline free?
Subsurface Maps Offline is free to download, with no in-app purchases.
Which has better reviews, e or Subsurface Maps Offline?
e and Subsurface Maps Offline are both rated 5.0 out of 5 on the App Store, from 3 and 2 ratings respectively.
Do e or Subsurface Maps Offline have ads?
Neither e nor Subsurface Maps Offline shows ads.
Which is updated more often, e or Subsurface Maps Offline?
e ships an update every 2 months, and Subsurface Maps Offline every 4 weeks. Most recently, e was updated on September 19, 2026 and Subsurface Maps Offline on September 16, 2026.

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