Comparison

SoilDoc vs Comet4

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

Head to head
About

SoilDoc

Features
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Soil structure is an essential component of soil fertility. The spade diagnosis is a suitable method for assessing the soil structure and other attributes of soil quality from observations such as odour, colour, roots, soil particles or soil layers. The SoilDoc app guides you through the spade diagnosis and the observations for a complete assessment of a selected soil. The app can replace former printed instructions. The SoilDoc app asks questions about the soil, which can be answered with a simple click. Additional information and example pictures help to find the answers. During the evaluation, the app collects all observations made and generates a report. The report is stored on the mobile phone and can then be exported in csv, txt or html format and saved as a PDF file on a computer. The simple archiving of the observations facilitates the comparison of different surveys at the same location.

About

Comet4

Features
Read full description

Comet4 It is the first system on the market that allows to carry out an antibiotic screening test automatically and share the results in real time. Just apply a drop of milk to the test tube and Comet4 will automatically perform the test in less than 2.5 hours. Results are sent to your smart device, cloud account or email in real time.

Screenshots

SoilDoc2 screens
Comet44 screens

Verdict

The call

The clearest difference is iOS requirement: SoilDoc at 13 against Comet4's 16.6. On price, update cadence, ads and in-app purchases there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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

UpkeepUpdate frequency

SoilDoc ships an update every 8 months, Comet4 every 6 months. The most recent releases landed on September 18, 2026 and September 30, 2026 respectively.

Scorecard1 real difference ยท 5 level
SoilDoc versus Comet4: the parameters behind the verdict, then further details
ParameterSoilDocComet4
PriceFreeFree
Update frequencyEvery 8 monthsEvery 6 months โ€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod โ€” betteriPhone, iPad
Requires iOS13 โ€” better16.6
Further details โ€” not scored
Size131 MB33 MB
Age rating4+4+
DeveloperForschungsinstitut fur biologischen Landbau FiBLAndres Mena Tobar

In-app purchases

None

SoilDoc

No in-app purchases

None

Comet4

No in-app purchases

Questions

Is SoilDoc free?
SoilDoc is free to download, with no in-app purchases.
Is Comet4 free?
Comet4 is free to download, with no in-app purchases.
Do SoilDoc or Comet4 have ads?
Neither SoilDoc nor Comet4 shows ads.
Which is updated more often, SoilDoc or Comet4?
SoilDoc ships an update every 8 months, and Comet4 every 6 months. Most recently, SoilDoc was updated on September 18, 2026 and Comet4 on September 30, 2026.

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