Survey C vs SpecPad
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
Survey C
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Professional applications for surveying engineers working on electrical, water, transportation, and telecommunications projects, with support for exporting DXF files for opening in AutoCAD (points, text, roads, and contour lines). Survey One and Survey C-Plus form a comprehensive application suite for surveying, design, supervision, and field documentation, suitable for a wide range of engineering projects. The suite provides complete surveying and design capabilities, including DXF (AutoCAD) export. No computer, Google Earth, AutoCAD offsets, or Civil 3D are required ā all workflows are handled directly on your iPhone. Main Features SURVEY ONE: ⢠Survey and mark point coordinates ⢠Record detailed information for each point ⢠Capture unlimited images per point, recorded directly at the marked location ⢠Support recording point content using icons ⢠Export NNT files (modern survey data format) ⢠Export KML files (compatible with Google Earth and Windows) ⢠Support deleting and editing points SURVEY C-PLUS: ⢠Receive shared files from any source ⢠Convert KML files to NNT format while preserving data integrity ⢠Export DXF files for opening in AutoCAD ⢠High-speed file processing and publishing, significantly reducing project time (from days to minutes) ⢠Full layer support: points, text, blocks, roads, and road offsets ⢠Support survey lines up to 25 km with high accuracy Who is it for? ⢠Transportation ⢠Power and energy ⢠Surveying and geodesy ⢠Construction and infrastructure ⢠Telecommunications Particularly suitable for the design and supervision of construction projects. Why choose Survey One and Survey C-Plus? ⢠Covers core requirements for engineering and construction projects ⢠Easy to use ⢠More cost-effective compared to similar solutions ⢠Fast, compact, and accurate ⢠Opens large files smoothly ⢠Does not collect user data Survey One and Survey C-Plus are reliable tools for surveying, design, and supervision of construction projects.
SpecPad
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SpecPad is a work notebook for people who deal in drawings: plans, schematics, boards, site photos. Mark them up, measure them, keep everything organized in notebooks, and export clean PDFs when it's time to send. It started with one problem: photographing a circuit board and needing labels that point at the exact pins. So callouts in SpecPad anchor to the photo itself. Zoom way in, drag the image around, the pin stays on the pad. That same stubbornness runs through the rest of the app: revision clouds you draw by hand and type inside, drawings you calibrate once and then measure in real units, redaction bars that actually remove what's under them on export. PAGES ⢠Canvas pages have no edges. They grow as you draw ⢠Notepad pages are real paper sizes (Letter, A4, Tabloid ā blank, grid, or lined) and print true to size ⢠Text Documents for the days you just need to type: headings, lists, dividers ⢠PDFs import as true vector pages. Mark them up and export with the markup embedded, while the original text stays searchable ⢠Scan paper with the camera, or start from a photo MARKUP ⢠Leader-line callouts anchored to the pixels of a photo ⢠Draw a rough circle around anything and it becomes a proper scalloped revision cloud with a text box inside ⢠Calibrate a drawing against one known length, then dimension anything on it in feet-inches or metric ⢠Numbered pins, a count tool with running totals, Bates-style numbering ⢠Punch lists: any markup can be Open or Resolved, and resolved items fade in reports STENCILS & STAMPS ⢠180 stencils across electronics, schematics, network & IT, construction, life safety, hatches, medical, education, proofreading, office, and design ⢠Pick your workflow and the toolbar tailors itself to your trade ⢠Star the tools you use daily to pin them to the bar ⢠Lasso anything you've drawn and save it as a reusable stamp, or import your own stencils INK & SHAPES ⢠Apple Pencil ink and highlighter, with shape snapping for when a rough box should become a clean one ⢠Cables that route around parts with the label riding the wire, and named nets that light up together ⢠Arrows, dimension lines, speech bubbles, hatches SHARING & SYNC ⢠Export PDF, PNG, branded markup reports, and annotation schedules ⢠Search everything, typed or handwritten ⢠Notebooks sync with iCloud. Share one to work together ⢠Focus mode, presentation mode, and audio recording on a page for walkthroughs SPECPAD PRO The free app is useful every single day, no paywall in your face. Pro adds unlimited pages, spreadsheet exports, path and area measurement, revision compare, and the project index. Subscribe, or buy lifetime once and be done. Made for iPad. Works on iPhone too. SpecPad comes from a small shop, not a big one. If your trade is missing a stencil or a tool, write in ā I read everything. Privacy Policy: https://steinmetzlabs.com/apps/specpad/privacy.html Terms of Use: https://steinmetzlabs.com/apps/specpad/terms.html Support: https://steinmetzlabs.com/apps/specpad/support.html
Screenshots
Verdict
Survey C and SpecPad are too close to call on the numbers: across 6 compared parameters ā price, update cadence, ads and in-app purchases among them ā neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
Both are free to download. Survey C sells 1 one-off in-app purchase and SpecPad sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
Survey C ships an update weekly, SpecPad every 10 days. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.
| Parameter | Survey C | SpecPad |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly ā better | Every 10 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone, iPad ā better |
| Requires iOS | 17.6 ā better | 18.0 |
| Further details ā not scored | ||
| Size | 5 MB | 19 MB |
| Age rating | 12+ | 4+ |
| Developer | Ngoc Tung Nguyen | John Steinmetz |
In-app purchases
Survey C
- Premium$200.00
SpecPad
- SpecPad Pro - Monthly$2.991 Month
- SpecPad Pro - Yearly$17.991 Year
- SpecPad Pro - Lifetime$29.99









