Twin vs Codifier
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Twin
This app combines two calculators into one, allowing for side-by-side or stacked calculations. Easily copy and paste results between calculators or to other apps. It displays formulas for clarity and handles basic arithmetic operations.
- Two calculators in one
- Side-by-side and stacked display
- One-touch copy/paste between calculators
- Copy results to iPhone memory
- Formula display
- Basic arithmetic operations
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A simple and easy-to-use calculator app that combines two calculators into one. Calculators are displayed side by side when the screen is horizontal, and vertically when the screen is vertical. In addition to being able to perform separate calculations with each calculator, calculation results can be also copy and paste with one touch, so you can perform other calculations during calculations, making it even more convenient to use than you might imagine. There is also a free version with ads. Please try it first. https://apps.apple.com/jp/app/t-calc-lite/id1630026837?l=jp 【feature】 1. Calculation results can be copy and paste between two calculators with one touch. 2. The result calculated can be input from one calculator to the other with one touch. ・When press the "→" key, the calculation result of the left calculator is entered at the end of the formula on the right calculator. ・When press the "←" key, the calculation result of the right calculator is entered at the end of the formula on the left calculator. 3. add, subtract, multiply and divide is performed. Do multiplication and division first, then add and subtract. 4. Display the formula The entered formula is displayed under the result, so you can easily check the operations. 5. Calculation results can be copied to iPhone’s memory Calculation results can be pasted into other apps as text , so transcription errors will not occur. Example of use When you find a product for 988 yen for 3 pieces and a product for 1245 yen for 4 pieces while shopping, you can easily calculate "Which is cheaper?" And “How cheaper?"with this calculator. 1) Use the left and right calculators to find the unit price of the product (unit price = product price/number). 2) Tap the "- key" and "arrow key" on either the left or right calculator to calculate the unit price difference. Limitations ・Answer can be calculated up to 9 digits, minimum 0.000000001. Note The free version can be downloaded from https://apps.apple.com/jp/app/t-calc-lite/id1630026837?l=en
Codifier
This app accurately spells out information using phonetic alphabets. It converts text, numbers, and symbols into universally recognized code words to ensure clear communication. Supports multiple languages and alphabets for versatile use.
- Spelling alphabets for clear communication
- Multiple institutional and regional alphabets
- Transcribes words, numbers, and special characters
- Hear pronunciations in supported languages
- Save favorites for quick access
- Copy transcriptions to clipboard
- Ad-free and private experience
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Codifier helps you accurately spell out important information using spelling alphabets. Use Codifier to spell names, e-mail addresses, serial numbers, booking codes, or anything else that needs to be clearly communicated. Simply type your text and Codifier will transcribe each letter into universally recognized code words—like ‘A for Alfa’ or ‘B for Bravo’—so there is never any room for confusion. Features: · Choose from 5 institutional English spelling alphabets, including ICAO/NATO, LAPD, Able-Baker, AT&T, and British Post Office · Access 12 regional alphabets, including Czech, Dutch, Finnish, French, German, Italian, Polish, Portuguese, Spanish, Swedish, U.S., and U.K. · Transcribe words, numbers, as well as special characters, including punctuation marks and currency symbols · Hear pronunciations for each code word, number, and symbol in every supported language · Save up to 10 favorites for quick access · Copy your transcriptions to clipboard and share directly with others · Enjoy a native iOS design, using Apple’s latest frameworks and UI guidelines Codifier provides a private and secure, ad-free experience—no ads, no tracking, ever. Terms of Service: https://crater.tools/codifier/terms-of-service Privacy Policy: https://crater.tools/codifier/privacy-policy
Screenshots
Verdict
The clearest difference is price: Codifier at Free against Twin's $1.99. Codifier also leads on review sentiment (100% vs 76%). Twin's advantage is ratings volume (8 vs 2) and device support (3 vs 1). On rating, 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
Codifier is free to download; Twin costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Twin against 5.0 for Codifier. Both are backed by a comparable volume of ratings — 8 and 2 respectively. Written reviews are what separate them: 76% of Twin's written reviews are positive against 100% of Codifier's.
Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 17, 2026 and October 9, 2026 respectively.
| Parameter | Twin | Codifier |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 5.0 (8 ratings) | 5.0 (2 ratings) |
| Positive reviews | 76.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 8 — better | 2 |
| Update frequency | Fortnightly | Fortnightly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 1 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Hiroyuki Ueda | Piotr Bakker |
Customer experience
Twin
Codifier
In-app purchases
Twin
No in-app purchases
Codifier
No in-app purchases








