Comparison

SPIDERPLUS for iPhone vs Sanitary Dft. Supt.

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

Head to head
About

SPIDERPLUS for iPhone

Features
Read full description

----What is SPIDER PLUS?---- SPIDER PLUS is a field work management and information sharing system specialized in the construction industry. Features *Download and store a large quantity of drawings data in a tablet PC and no need to carry around paper drawings. *Attach memos and photos on the drawings at the field. *There is a folder function similar to Windows Explorer, and thumbnail images are also displayed and desired drawings can be easily found. *Approximate distance can be measured through a scale function. *Drawings and photos turned into PDF files on an iPad can be mailed directly without going through a server. *Share information among users in real-time. *Memos and photos can be output as EXCEL/PDF report. ----How to use SPIDER PLUS?---- 1. Register drawings on the server 2. Download to mobile devices from the server and carry around 3. Attach memos and photos on the drawings at the field 4. Share information among users in real-time 5. Edit and output contents entered from mobile devices using a web browser.

About

Sanitary Dft. Supt.

Features
Read full description

[Overview] Based on Japanese Design Standards Sanitary Drafting Supporter is a professional calculation app for sanitary shop drawings and plumbing design. It brings together the calculations most frequently required for sanitary and plumbing projects, including water supply and drainage pipe sizing, piping engineering calculations, and simplified seismic calculations for pipe supports. Designed for engineers, designers, and construction professionals to improve efficiency in sanitary shop drawing preparation and plumbing design. [Key Features] * Water Supply & Drainage Pipe Sizing (Fixture Unit Method) * Automatically calculates pipe sizes using the Fixture Unit Method. * Calculates fixture units and recommends pipe sizes from the selected plumbing fixtures. * Manage and edit multiple piping systems. * Combine or modify piping systems easily. * Verify results with a flow diagram. * Piping Engineering Calculations Perform essential piping calculations required for plumbing design and shop drawings. * Pipe weight calculation * Flow velocity calculation * Pressure loss calculation * Thermal expansion calculation Supports design studies and engineering documentation. * Simplified Seismic Calculations for Pipe Supports * Simplified seismic calculations for L-shaped supports * Simplified seismic calculations for portal frame supports * Anchor bolt strength check * Anchor bolt pull-out verification Helps verify the safety of pipe support systems during the design stage. [Recommended For] * Plumbing designers * Sanitary shop drawing engineers * Building services engineers * Construction managers * Mechanical (MEP) engineers * Plumbing contractors * Professionals involved in sanitary and plumbing projects [Evaluation Period] All features are available for 30 days after initial installation. An auto-renewable subscription is required to continue using the features after the 30-day period. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://ratel-okottel.com/privacy/ Evaluate the app in your actual design and shop drawing workflow before purchasing.

Screenshots

SPIDERPLUS for iPhone4 screens
Sanitary Dft. Supt.4 screens

Verdict

The call

The clearest difference is in-app purchases: SPIDERPLUS for iPhone at none against Sanitary Dft. Supt.'s 2. Sanitary Dft. Supt.'s advantage is update cadence (daily vs every 5 weeks). On price, ads, device support and iOS requirement there is nothing between them.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Sanitary Dft. Supt. sells 2 in-app purchases, starting at $2.99 per month. SPIDERPLUS for iPhone asks for nothing beyond the download.

UpkeepUpdate frequency

SPIDERPLUS for iPhone ships an update every 5 weeks, Sanitary Dft. Supt. daily. The most recent releases landed on October 30, 2026 and November 6, 2026 respectively.

Scorecard2 real differences Β· 4 level
SPIDERPLUS for iPhone versus Sanitary Dft. Supt.: the parameters behind the verdict, then further details
ParameterSPIDERPLUS for iPhoneSanitary Dft. Supt.
PriceFreeFree
Update frequencyEvery 5 weeksDaily β€” better
AdsNoNo
In-app purchasesNo β€” betterYes
DevicesiPhoneiPhone, iPad β€” better
Requires iOS17.0 β€” better17.6
Further details β€” not scored
Size54 MB78 MB
Age rating4+4+
DeveloperSpiderPlus & Co.Hiroaki Oosawa

In-app purchases

None

SPIDERPLUS for iPhone

No in-app purchases

2 purchases

Sanitary Dft. Supt.

Subscriptions2
  • Premium Monthly$2.991 Month
  • Premium Yearly$29.991 Year

Questions

Is SPIDERPLUS for iPhone free?
SPIDERPLUS for iPhone is free to download, with no in-app purchases.
Is Sanitary Dft. Supt. free?
Sanitary Dft. Supt. is free to download, with in-app purchases available.
Do SPIDERPLUS for iPhone or Sanitary Dft. Supt. have ads?
Neither SPIDERPLUS for iPhone nor Sanitary Dft. Supt. shows ads.
Which is updated more often, SPIDERPLUS for iPhone or Sanitary Dft. Supt.?
SPIDERPLUS for iPhone ships an update every 5 weeks, and Sanitary Dft. Supt. daily. Most recently, SPIDERPLUS for iPhone was updated on October 30, 2026 and Sanitary Dft. Supt. on November 6, 2026.

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