TBD vs Survey C
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TBD
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TBD-flowmeter is a companion software that monitors your daily water equipment, giving you a clear picture of your water usage; and a smarter way to track and reduce water usage based on your water bill
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 — 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.
Screenshots
Verdict
The clearest difference is in-app purchases: TBD at none against Survey C's 1. TBD also leads on iOS requirement (13.0 vs 17.6). Survey C's advantage is update cadence (weekly vs every 5 weeks). On price, ads and device support 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
Both are free to download. Survey C sells 1 one-off in-app purchase. TBD asks for nothing beyond the download.
TBD ships an update every 5 weeks, Survey C weekly. The most recent releases landed on October 8, 2026 and October 7, 2026 respectively.
| Parameter | TBD | Survey C |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 13.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 19 MB | 5 MB |
| Age rating | 4+ | 12+ |
| Developer | Hangzhou Dashi Wisdom Technology Co., Ltd. | Ngoc Tung Nguyen |
In-app purchases
TBD
No in-app purchases
Survey C
- Premium$200.00








