Evongo vs StairPlan
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Evongo
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Evongo, an app dedicated to providing better services for electric vehicle owners. Evongo provides you with multiple modes of charging solutions * Reservation charging: enjoy the preferential valley tariff; * Timed charging: precisely control the charging duration; * Card-free charging: Say goodbye to the tediousness and charge as you go.
StairPlan
Calculate staircase dimensions and check them against building codes. Supports various stair types and offers AR measurement, 3D previews, and exportable diagrams. Save unlimited projects offline.
- Calculate stringer length, riser height, tread depth, and pitch
- Supports straight, L-shaped, U-shaped, winder, spiral, and deck stairs
- Real-time code compliance checks (US, Canada, UK, Australia)
- AR camera measurement and 3D previews
- Exportable cut diagrams, cut lists, and CAD files
- Save unlimited projects offline
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What does StairPlan do? Calculates stringer length, riser height, tread depth, and pitch angle for any staircase — straight, L-shaped, U-shaped, winder, spiral, deck, or multi-flight with landings. Checks your numbers against US IRC, IBC, OSHA, ADA, Canada NBC, UK Approved Doc K, or Australia NCC in real time. Is my data private? 100% offline. Nothing leaves your iPhone. No accounts, no analytics, no ads, no tracking. What stair types does it handle? - Straight, L-shaped, U-shaped, and winder stairs, plus multi-flight designs with 3+ landings, including split-level stairs that pass through more than one floor - Spiral and helical stairs — center-pole radius, walkline tread, outer helix length - Deck stairs with wood or composite stringer-spacing advisories, including wraparound and corner deck stairs via multi-flight layouts What codes does it check? - US IRC R311.7 (residential), IBC (commercial), OSHA 1910.25 (industrial), and ADA - Canada NBC, UK Approved Doc K, and Australia NCC 2022 - Handrail height, guard height, and graspability checks - Landing depth and minimum stair width compliance - Rough opening sizing for code-compliant headroom What else can it do? - AR camera measurement — two taps straight into Total Rise (LiDAR gets +/-1 cm) - 3D preview from 6 camera angles, alongside a scale side-view drawing - Framing Square layout table with a full step-off table - Smart Suggest — instant riser/tread combos that meet your chosen code - Baluster spacing and structural throat/span checks - Save unlimited projects with custom names and notes. Your saved projects stay viewable even if your subscription lapses — your work is never locked away. What can I export? Scale PDF cut diagrams that print at true size, a per-board cut list with plumb/level angles, DXF and SVG for CAD, a high-res PNG spec sheet, and a CSV cut list for spreadsheets. What units does it support? Imperial (feet and inches, fractions to 1/64) and Metric (millimeters and centimeters). Who is this for? Carpenters, finish carpenters, deck builders, renovation contractors, commercial and industrial estimators working to IBC or OSHA, and DIY homeowners building porch steps, deck stairs, or interior staircases. How much does it cost? 3-day free trial, then $1.99/week, $4.99/month, $29.99/year, or $79.99 lifetime. Terms of Use: https://taxlite.net/stair_stringer_calc/terms.html Privacy Policy: https://taxlite.net/stair_stringer_calc/privacy.html
Screenshots
Verdict
The clearest difference is in-app purchases: Evongo at none against StairPlan's 4. Evongo also leads on iOS requirement (12.3 vs 17.0). 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. StairPlan sells 4 in-app purchases, starting at $1.99 per 7 days. Evongo asks for nothing beyond the download.
| Parameter | Evongo | StairPlan |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | — | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 12.3 — better | 17.0 |
| Further details — not scored | ||
| Size | 42 MB | 3 MB |
| Age rating | 17+ | 4+ |
| Developer | Nantang Technology (Shenzhen) Co., Ltd. | ZHENGQIAO JIANG |
In-app purchases
Evongo
No in-app purchases
StairPlan
- Weekly3 Days trial$1.997 Days
- Monthly$4.991 Month
- Yearly3 Days trial$29.991 Year
- Lifetime$79.99









