Comparison

NextTerm vs PlantCalculator

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

Head to head
About

NextTerm

Features
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NextTerm is a focused SSH and SFTP client for developers, system administrators, and anyone who manages servers from iPhone or iPad. Key features: - SSH terminal with custom keyboard controls - Password and OpenSSH private key authentication - Host key verification with trusted known hosts - SFTP file browsing, upload, and download - Local network discovery for nearby services - Secure storage for passwords, PINs, and private keys using Keychain - Optional Face ID / PIN app lock NextTerm Enhanced permanently unlocks command snippets, local SSH tunnels, batch SFTP transfers, path favorites, advanced SFTP actions, session log export, and encrypted configuration backups with one purchase. No subscription. NextTerm does not track you and does not route your server traffic through external services. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

PlantCalculator

Features
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The nameplate reads "52.7 kg/cm²G." Your reference is in psi. The formula wants MPa. You can stop doing that conversion in your head. Plant Calculator brings together the calculations used every day in refinery and chemical plant equipment inspection — one app, built for the field. ■ Type the number on the nameplate, as-is Every input field has a unit selector. Enter kg/cm²G, psi or bar exactly as written, and the app does the conversion. If you think in kg/cm², set it as your default in Settings and every screen opens that way. 15 categories, 65 units. ■ Works where there's no signal Inside a vessel, inside a tank — every calculation runs entirely on your device. ■ Enter only what you already know - Pick a nominal size and schedule, and OD and wall are filled in (ASME/JIS, 45 sizes) - Pick a material and temperature, and the allowable stress is interpolated and filled in (9 materials) No more flipping through dimension tables. ■ Main features - Quick Check: from pipe and inspection data, review original wall, required thickness, corrosion rate, remaining life and thickness margin together - Required thickness: minimum wall for piping and pressure vessels under internal pressure (JIS B 8265 / High Pressure Gas (KHK), ASME Sec.VIII Div.1, ASME B31.3; cylinders, heads, straight pipe and elbows) - Corrosion rate & remaining life from previous/current thickness and elapsed years - Metal loss check: average, minimum and variation from readings, with simplified general and local metal-loss checks - Vertical tower check: internal pressure, dead weight, wind and seismic (static seismic coefficient method); checks tension and compression for operating and shutdown cases and shows a reference thickness. Skirt included - External pressure: simplified allowable external pressure check for cylinders - Nozzle reinforcement: area replacement method - Relief valve sizing: required orifice area based on API 520 - Piping: support span, pressure drop and velocity - Vessel: flange, bolt torque, flat plate, cone and support loads - Surface area: outer area of pipe, elbow, head and reducer; add count and insulation thickness for painting/cladding area and a material estimate - Tank / line totals: connect elements to sum area, volume and weight - Thermal expansion from temperature difference - Calculator + equation solver: scientific calculator (trigonometry, logs, powers, roots, memory, EE input, DEG/RAD) that also solves simultaneous equations in x, y and z - Unit conversion: 15 categories, including multiplication and division with units (e.g. 200 mm × 200 mm = 0.04 m²) - Size quick reference: NPS to OD, wall, ID, volume and pipe weight - Pipe dimension lookup: pick a size to see OD and wall per schedule (ASME B36.10M/B36.19M / JIS, physical dimension reference values) - Flange rating check: enter the rated pressure from your standard and compare with design pressure (ASME B16.5, etc.; rating table not bundled) - Material list: temperature-dependent allowable stress reference values (based on High Pressure Gas example standards) - Glossary for inspection and design terms - Calculation history: save, delete and copy as CSV - 8 languages (Japanese, English, Español, Português, 한국어, Deutsch, العربية, Русский), dark mode ■ Important This app is a supporting tool for design and inspection. Formulas are representative, and allowable stresses, dimensions and ratings are approximate reference values. Always verify against the official formulas and latest values of the applicable codes (JIS B 8265 / High Pressure Gas example standards / ASME Sec.II Part D / B16.5 / B36.10M, etc.) before making any decision. Do not rely on this app's results alone.

Screenshots

NextTerm4 screens
PlantCalculator4 screens

Verdict

The call

The clearest difference is in-app purchases: PlantCalculator at none against NextTerm's 3. PlantCalculator also leads on update cadence (every 9 days vs every 2 months) and iOS requirement (13.0 vs 17.6). NextTerm's advantage is ads (none vs shown). On price 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. NextTerm sells 3 in-app purchases, starting at $4.99 per month. PlantCalculator asks for nothing beyond the download.

UpkeepUpdate frequency

NextTerm ships an update every 2 months, PlantCalculator every 9 days. The most recent releases landed on October 24, 2026 and October 12, 2026 respectively.

Scorecard4 real differences · 2 level
NextTerm versus PlantCalculator: the parameters behind the verdict, then further details
ParameterNextTermPlantCalculator
PriceFreeFree
Update frequencyEvery 2 monthsEvery 9 days — better
AdsNo — betterYes
In-app purchasesYesNo — better
DevicesiPhone, iPad, MaciPhone, iPad, iPod
Requires iOS17.613.0 — better
Further details — not scored
Size17 MB25 MB
Age rating4+4+
DeveloperlecooRyo Iida

In-app purchases

3 purchases

NextTerm

Subscriptions2
  • NextTerm Pro Monthly$4.991 Month
  • NextTerm Pro Yearly$49.991 Year
One-time1
  • NextTerm Pro Lifetime$0.99
None

PlantCalculator

No in-app purchases

Questions

Is NextTerm free?
NextTerm is free to download, with in-app purchases available.
Is PlantCalculator free?
PlantCalculator is free to download, with no in-app purchases.
Do NextTerm or PlantCalculator have ads?
PlantCalculator shows ads; NextTerm does not.
Which is updated more often, NextTerm or PlantCalculator?
NextTerm ships an update every 2 months, and PlantCalculator every 9 days. Most recently, NextTerm was updated on October 24, 2026 and PlantCalculator on October 12, 2026.

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