Comparison

NapCat vs calc318

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

Head to head
About

NapCat

Access and read your favorite GitHub repositories offline on any device. This app offers a powerful code editor and comfortable reading experience with syntax highlighting for over 90 languages. Enjoy your code anywhere, anytime.

Highlights
  • Offline Git client
  • Code editor
  • Syntax highlighting
  • Starred repository access
  • Supports 90+ languages
  • Customizable themes
Features
Read full description

Reading and exploring source code should be enjoyable and not limited to your desktop. NapCat is a GitHub client that lets you download your most-used or favorite projects for offline reading and coding on the go. Features: • Universal: one app for all your devices • Fully offline Git client • Powerful code editor • Private Coding Agent Built-In (*) • Comfortable offline reading with beautiful syntax highlighting • Quick access to starred repositories • Support for 90+ languages and 30 themes, so you can read comfortably in bright sunlight or late at night (**) What users say: "Oh @napcatapp, you're the best discovery I've made all month." -- @davidlesches "The best code reader ever for iOS: NapCat - A GitHub Client" -- @elia "If you're in the market for a free iPhone github code reader, I totally recommend NapCat" — @drewbiewubie "NapCat on iPad is great when you want to offline study something cool on github" — @siuying ----- • Full version: access to all themes • Full version: unlimited offline code storage • Full version: access to private repositories ----- * Agent run locally, only context is sent to LLM ** Access to all themes is available with the Full Version upgrade Terms of Use: https://www.apple.com/legal/itunes/appstore/dev/stdeula

About

calc318

Instantly solve 175 ACI 318-19 equations with live computation and interactive charts. Understand equation behavior with sensitivity graphs and clear variable descriptions. Designed for engineers needing quick, accurate calculations and insights.

Highlights
  • 175 ACI 318-19 equations solved instantly
  • Live computation with unit awareness
  • Interactive sensitivity graphs
  • Professionally formatted equations
  • Complete variable descriptions
  • Smart search functionality
  • Recents tab for quick access
Features
Read full description

Solve all 175 equations from ACI 318-19 Appendix C, instantly, in US Customary Units. Calc318 turns the equations from ACI 318-19 Appendix C into a live calculator. Pick an equation, enter your parameters, and get an answer the moment you type — beautifully rendered, with every variable clearly defined and unit-aware. No spreadsheets, no hand calcs. calc318 requires an auto-renewable subscription. Start your 7-day free trial — no charge until the trial ends, and you can cancel anytime. After the trial, your subscription continues at $12.99/year or $2.99/month. Manage or cancel anytime in Settings → Apple ID → Subscriptions. See more than just a number. Tap any input to open an interactive chart that shows exactly how your result responds as that parameter changes — with a draggable point and a family of curves for the other key variables, so you understand the behavior of the equation, not just one data point. FEATURES: - Live computation for all 175 ACI 318-19 equations, fully unit-aware. - Professionally formatted equations with LaTeX-quality rendering. - Interactive sensitivity graphs — drag a point and watch the result update in real time. - Compare curves across multiple parameter values to see trends at a glance. - Complete variable descriptions and units for every input. - Smart search by section number, chapter, keyword, or variable. - Recents tab to jump back to equations you use most. - Clean, intuitive interface designed for engineers. Whether you're checking a calculation, running a quick sensitivity study, or referencing design provisions, calc318 gets you the answer — and the insight behind it — in seconds. Privacy Policy: https://aiosciv.com/calc318/ Terms of Use (EULA): http://www.apple.com/legal/itunes/appstore/dev/stdeula

Screenshots

NapCat4 screens
calc3184 screens

Verdict

The call

The clearest difference is rating: calc318 at 5.0 against NapCat's 3.7. calc318 also leads on review sentiment (100% vs 67%). NapCat's advantage is monetization model (free with in-app purchases vs subscription) and ratings volume (7 vs 1). On price, update cadence, ads and in-app purchases 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. NapCat sells 3 in-app purchases, starting at $1.99 per month and calc318 sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

calc318 holds the better App Store score, 5.0 against 3.7. That said, the two scores are not equally well evidenced: NapCat has 7 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 67% of NapCat's written reviews are positive against 100% of calc318's.

UpkeepUpdate frequency

NapCat ships an update every 4 months, calc318 every 3 months. The most recent releases landed on October 5, 2026 and October 1, 2026 respectively.

Scorecard6 real differences · 4 level
NapCat versus calc318: the parameters behind the verdict, then further details
ParameterNapCatcalc318
PriceFreeFree
Rating3.7 (7 ratings)5.0 (1 ratings) — better
Positive reviews66.7% of reviews100.0% of reviews — better
Number of ratings7 — better1
Update frequencyEvery 4 monthsEvery 3 months — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases — betterSubscription
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.5 — better26.0
Further details — not scored
Size156 MB19 MB
Age rating4+4+
DeveloperShotdoorARTIFICIAL INTELLIGENCE OPTIMIZATION AND SOFTWARE AIOS LLC

Customer experience

NapCat

All ratings7 ratings
Positive71.4%
Neutral0.0%
Negative28.6%
Written reviews33 reviews
Positive66.7%
Neutral9.1%
Negative24.2%

calc318

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

NapCat

Subscriptions2
  • 1 Month Pro$1.991 Month
  • 1 Year Pro$9.991 Year
One-time1
  • NapCat Upgrade$12.99
2 purchases

calc318

Subscriptions2
  • calc318 Pro Monthly7 Days trial$2.991 Month
  • calc318 Pro Yearly7 Days trial$12.991 Year

Questions

Is NapCat free?
NapCat is free to download, with in-app purchases available.
Is calc318 free?
calc318 is free to download, with in-app purchases available.
Which has better reviews, NapCat or calc318?
calc318 is rated higher. NapCat averages 3.7 out of 5 from 7 ratings, while calc318 averages 5.0 from 1 ratings.
Do NapCat or calc318 have ads?
Neither NapCat nor calc318 shows ads.
Which is updated more often, NapCat or calc318?
NapCat ships an update every 4 months, and calc318 every 3 months. Most recently, NapCat was updated on October 5, 2026 and calc318 on October 1, 2026.

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