ThetaCalc vs Voltcraft VC
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ThetaCalc
This utility app provides a Reverse Polish Notation (RPN) calculator. Users can extend its functionality by programming custom functions and equations using JavaScript.
- Reverse Polish Notation (RPN) calculator
- User-programmable functions
- JavaScript equation support
- Extensible functionality
Read full descriptionHide full description
ThetaCalc is a RPN (Reverse Polish Notation) calculator which can be extended by functions and equations programmed by the user in JavaScript.
Voltcraft VC
Read full descriptionHide full description
Compatible with Voltcraft's VC-41 Series socket tester, the App allows the user to: • Stream data to iPhone or iPad internal memory, with real-time remote viewing • Adjust sample rate • Export data in Excel® format • Share data files directly from application • Take snapshots of the measurement area with the connected iPhone or iPad camera • Store over 15k readings with the VC-41 wireless datalogging module, for download to Phone or Tablet, with programmable datalogger file size
Screenshots
Verdict
The clearest difference is iOS requirement: Voltcraft VC at 11.0 against ThetaCalc's 17.6. 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
ThetaCalc ships an update every 3 months, Voltcraft VC every 2 months. The most recent releases landed on October 1, 2026 and October 19, 2026 respectively.
| Parameter | ThetaCalc | Voltcraft VC |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 11.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 13 MB |
| Age rating | 4+ | 17+ |
| Developer | Felix Stehli | CEI Conrad Electronic International (HK) Limited |
In-app purchases
ThetaCalc
No in-app purchases
Voltcraft VC
No in-app purchases
