Comparison

CALC 1 Programmable Calculator vs ThetaCalc

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

Head to head
About

CALC 1 Programmable Calculator

Create custom calculators with AI-generated JavaScript functions for precise calculations and data visualization. Assign programs to keys and manage data efficiently. Offers multiple calculation modes and extensive documentation.

Highlights
  • AI-assisted JavaScript function creation
  • Customizable function calculators
  • Data visualization and plotting
  • Programmable calculator keys
  • List and data management
  • Multiple calculation modes (algebraic, RPN)
Features
Read full description

Customize your calculators for quick and accurate calculations with CALC 1 - the ultimate programmable calculator for your iPhone or iPad. * Harness the power of AI: Ask your favorite AI tool to create JavaScript functions for you * Effortlessly create Function Calculators: Simply copy the AI-generated function code to your clipboard and tap the add button in the "Function Calculators" list - CALC 1 will automatically create a new Function Calculator (Always test the Function Calculator to verify the function is as you intended) * Execute functions with ease: Key in the parameter values to run the function and get instant results * Perform breakeven analysis: Function Calculators can solve for any non-integer parameter * Visualize data effortlessly: Create plots as a function of any parameter by entering the min and max values * Assign programs to individual calculator keys for personalized functionality * Create custom calculators by copying and pasting keys from pre-built calculators * Automatically generate keys from entered expressions for effortless reuse * CALC 1 has over 100 built-in functions that you can use from your JavaScript code * Manage lists and data with the List Manager and Data Manager for quick and accurate importing * Choose between algebraic, chain, or RPN calculation modes with an automatic stack * Access the CALC 1 documentation site with over 100 pages of searchable content and video tutorials, easily accessible through help links (?) within the app Whether you're a student, professional, or simply someone who appreciates the power of customization and AI-assisted productivity, CALC 1 offers a consistent and efficient solution to a wide range of problems. Upgrade your calculation experience with CALC 1 today!

About

ThetaCalc

This utility app provides a Reverse Polish Notation (RPN) calculator. Users can extend its functionality by programming custom functions and equations using JavaScript.

Highlights
  • Reverse Polish Notation (RPN) calculator
  • User-programmable functions
  • JavaScript equation support
  • Extensible functionality
Features
Read full description

ThetaCalc is a RPN (Reverse Polish Notation) calculator which can be extended by functions and equations programmed by the user in JavaScript.

Screenshots

CALC 1 Programmable Calculator4 screens
ThetaCalc4 screens

Verdict

The call

The clearest difference is price: ThetaCalc at Free against CALC 1 Programmable Calculator's $9.99. CALC 1 Programmable Calculator's advantage is rating (4.6 vs 4.3) and update cadence (every 5 weeks vs every 3 months). On review sentiment, ratings volume, 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

ThetaCalc is free to download; CALC 1 Programmable Calculator costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

CALC 1 Programmable Calculator holds the better App Store score, 4.6 against 4.3. Both are backed by a comparable volume of ratings — 9 and 4 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

CALC 1 Programmable Calculator ships an update every 5 weeks, ThetaCalc every 3 months. The most recent releases landed on September 9, 2026 and June 1, 2026 respectively.

Scorecard4 real differences · 6 level
CALC 1 Programmable Calculator versus ThetaCalc: the parameters behind the verdict, then further details
ParameterCALC 1 Programmable CalculatorThetaCalc
Price$9.99Free — better
Rating4.6 (9 ratings) — better4.3 (4 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings9 — better4
Update frequencyEvery 5 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.1 — better17.6
Further details — not scored
Size8 MB1 MB
Age rating4+4+
DeveloperCalcFxC, LLCFelix Stehli

Customer experience

CALC 1 Programmable Calculator

All ratings9 ratings
Positive88.9%
Neutral0.0%
Negative11.1%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

ThetaCalc

All ratings4 ratings
Positive75.0%
Neutral25.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

CALC 1 Programmable Calculator

No in-app purchases

None

ThetaCalc

No in-app purchases

Questions

Is CALC 1 Programmable Calculator free?
CALC 1 Programmable Calculator costs $9.99, with no in-app purchases.
Is ThetaCalc free?
ThetaCalc is free to download, with no in-app purchases.
Which has better reviews, CALC 1 Programmable Calculator or ThetaCalc?
CALC 1 Programmable Calculator is rated higher. CALC 1 Programmable Calculator averages 4.6 out of 5 from 9 ratings, while ThetaCalc averages 4.3 from 4 ratings.
Do CALC 1 Programmable Calculator or ThetaCalc have ads?
Neither CALC 1 Programmable Calculator nor ThetaCalc shows ads.
Which is updated more often, CALC 1 Programmable Calculator or ThetaCalc?
CALC 1 Programmable Calculator ships an update every 5 weeks, and ThetaCalc every 3 months. Most recently, CALC 1 Programmable Calculator was updated on September 9, 2026 and ThetaCalc on June 1, 2026.

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