InterCalc vs thoschCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
InterCalc
This app performs linear interpolation using a set of X-Y values to define a relationship. It can calculate values based on defined points, useful for tasks like converting pressure readings to fluid volumes in containers or performing simple unit conversions.
- Linear interpolation of X-Y values
- Defines arbitrary functions from data points
- Calculates fluid volume from pressure readings
- Performs unit conversions (e.g., temperature, speed)
- Supports custom data sets
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This application is designed to linearly interpolate a value given a set of X-Y values that define a relationship. The X-Y values can be as simple as two points that specify a simple line, or they can be a set of points that specifies an arbitrary function. One use of this program is to calculate the amount of fluid in a container given a pressure reading at the bottom of the tank. Typically this situation results in several pressure readings and corresponding volume ( gallons, liters ) readings as the tank is being filled. Once the pressure measuring device is so calibrated, pressure readings can then be converted to gallon or liter values. Other uses include simple conversions between Fahrenheit and Celsius, or between kph and mph.
thoschCalc
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thoschCalc is a quick and easy to use calculator that immediately calculates the result as you enter the term. In addition to the basic arithmetic operations, the constants can be used - pi, g, e, c(0), G, m(u), e(u) and functions - sqr(x), sqrt(x), pow(b;e) - sin(x), cos(X), tan(x), acos(x), asin(x), atan₂(a;b) - exp(x), ln(x), log(x), log₁₀(x), log₂(x) - abs(x), trunc(x), round(x), mod(a;b) - max(x1;...;xn), min(x1;..;xn) be integrated into the calculation steps. Numbers of different units of the same dimension are automatically converted into the set unit of the calculation result before the calculation: - Length: mm, cm, dm, m, km, inch, foot, yard, mi, nm - Area: mm², cm², dm², m², km², inch², foot², yard², mi², nm², ha - Volume: mm³, cm³, dm³, m³, km³, inch³, foot³, yard³, mi³, nm³, ml, l, oz, oz(us), gal, gal(us), bbl, bbl(us) - Weight: µg, mg, g, kg, t, lbs - Time and date: t, ms, s, min, h, day, week, year (28), year (29 = leap year), date, time - Temperature: Celsius, Fahrenheit, Kelvin - Speed: m/s, km/h, mph, fps, kn - Flow: cm³/s, cm³/min, cm³/h, cm³/day, cm³/year, l/s, l/min, l/h, l/day, l/year, m³/s, m³/min , m³/h, m³/day, m³/year, km³/s, km³/min, km³/h, km³/day, km³/year The entered term and the result can be transferred to other programs by long pressing and copying or pasting (copy & paste). The color of the background can be changed by shaking (iOS only) or via a dialog. The free version can be used 10 times with the full range of functions. From version 6.0 onwards, an annual subscription must be taken out (the further development does not only live on air and love and not every expansion is permanently free despite a previous one-off purchase) or only calculations without constants, functions or units are possible. In the free version, the last 5 previous calculations can be restored via a selection box or by swiping vertically on the input field. An in-app purchase can increase the number of previous calculations to 500. With a further in-app purchase, the history (optionally including the results) can be displayed in a separate table in which you can search for previous terms in order to use them for further calculations. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is price: InterCalc at Free against thoschCalc's $2.99. InterCalc also leads on in-app purchases (none vs 3). thoschCalc's advantage is update cadence (every 3 weeks vs every 11 months) and device support (4 vs 2). On ads 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
InterCalc is free to download; thoschCalc costs $2.99 up front. thoschCalc sells 3 in-app purchases, starting at $0.99 per year. InterCalc asks for nothing beyond the download.
InterCalc ships an update every 11 months, thoschCalc every 3 weeks. The most recent releases landed on June 25, 2026 and September 8, 2026 respectively.
| Parameter | InterCalc | thoschCalc |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 11 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 18.6 | 12.3 — better |
| Further details — not scored | ||
| Size | 1 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | River Rock Logic | Thorsten Schueler |
In-app purchases
InterCalc
No in-app purchases
thoschCalc
- constants, functions & units$0.991 Year
- Extended history$0.99
- Browse history$0.99





