Compare Flow vs CRSI Rebar Reference
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Compare Flow
This application helps engineers and designers evaluate the hydraulic flow capacity of various non-pressure sewer pipe types. It allows for comparisons between different pipe geometries and materials, including concrete, thermoplastic, and metal options.
- Manning's Formula calculation
- Compare hydraulic flow capacity
- Evaluate pipe geometry alternatives
- Compare pipe material options
- Supports concrete, thermoplastic, and metal pipes
- Circular, elliptical, arch, and box sections
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Compare Flow app uses Manning's Formula, the most widely accepted formula for evaluating the hydraulic capacity of non-pressure sewers. In order to evaluate possible alternatives in either pipe geometry or material, use this app to compare the hydraulic flow capacity among various concrete pipes including circular, elliptical, arch and box sections with circular thermoplastic and corrugated metal pipes.
CRSI Rebar Reference
Access essential data for reinforcing bars (rebar) including specifications, hook details, and marking requirements. This app serves as a quick reference for industry standards and links to online resources.
- ASTM standard reinforcing bar specifications
- Standard hook details (90, 135, 180 degrees)
- Stirrup/tie hook details
- ASTM reinforcing bar marking requirements
- Minimum yield and tensile requirements
- Links to CRSI online resources
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QUICK REFERENCE! This ready reference app from the Concrete Reinforcing Steel Institute is a handy desk and field resource and includes information on ASTM standard reinforcing bars (rebar), standard hook details, standard stirrup/tie hook details, and ASTM reinforcing bar marking requirements. The app provides standard rebar specifications including sizes, diameters, areas and weights along with 90-, 135- and 180-degree hook details. Minimum yield and minimum tensile requirements per ASTM are also included. Industry standard bar markings for inch-pound rebar is illustrated for grades 40, 50, 60, 75, 80, 100 (A615), 100 (A1035), and 120. Links to the CRSI’s online resources are included.
Screenshots
Verdict
The clearest difference is rating: Compare Flow at 4.6 against CRSI Rebar Reference's 3.3. Compare Flow also leads on in-app purchases (none vs 3) and review sentiment (50% vs 33%). CRSI Rebar Reference's advantage is update cadence (every 5 weeks vs every 32 months) and ratings volume (16 vs 5). On price, ads, monetization model 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. CRSI Rebar Reference sells 3 one-off in-app purchases. Compare Flow asks for nothing beyond the download.
Compare Flow holds the better App Store score, 4.6 against 3.3. Both are backed by a comparable volume of ratings — 5 and 16 respectively. Written reviews point the same way: 50% of Compare Flow's written reviews are positive against 33% of CRSI Rebar Reference's.
Compare Flow ships an update every 32 months, CRSI Rebar Reference every 5 weeks. The most recent releases landed on September 17, 2026 and June 1, 2026 respectively.
| Parameter | Compare Flow | CRSI Rebar Reference |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (5 ratings) — better | 3.3 (16 ratings) |
| Positive reviews | 50.0% of reviews — better | 33.3% of reviews |
| Number of ratings | 5 | 16 — better |
| Update frequency | Every 32 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 15.1 |
| Further details — not scored | ||
| Size | 23 MB | 51 MB |
| Age rating | 4+ | 17+ |
| Developer | iENGINEERING Corporation | Concrete Reinforcing Steel Institute |
Customer experience
Compare Flow
CRSI Rebar Reference
In-app purchases
Compare Flow
No in-app purchases
CRSI Rebar Reference
- CRSI - Rebar Identifier Module$2.99
- CRSI Development Length ACI$4.99
- CRSI Development length AASHTO$4.99
Questions
Is Compare Flow free?
Is CRSI Rebar Reference free?
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