Twin vs Waveform
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
Waveform
This app provides offline playback for local audio and video files, offering robust library management and seamless control. It allows for easy file import, organization, and sharing with other users nearby, all without an internet connection.
- Zero-latency offline playback
- Import and organize local files
- Instant search and flexible sorting
- Multi-select for efficient management
- Built-in artwork and metadata editing
- Persistent mini player and Now Playing interface
- Nearby audio sharing (Waves)
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App is an offline media player built for the audio and video files you already own. Import your media, organise your library, customize artwork and metadata, and play everything without streaming, subscriptions, or an internet connection. This app supports a wide range of audio and video formats, including MP3, FLAC, WAV, AAC, ALAC, MP4, MOV, WebM, and more. Features and Highlights: • Play audio and video stored on your device • Browse songs, artists, albums, playlists, and videos • Search and sort your library • Edit metadata and artwork • Build and manage playlists • Queue tracks with Up Next and Play Next • Shuffle, repeat, and set a sleep timer • Control playback with Now Playing and the mini player • Bring your library on the road with CarPlay • Bring your library anywhere with Apple Watch • Manage large libraries with multi-select tools • No streaming. No account. No subscription required App is compatible with: • iPhone and iPhone Duo • iPad • iMac • Apple TV • Apple Watch • Apple CarPlay • Siri Commands Thanks for using this app.
Screenshots
Verdict
The clearest difference is price: Waveform at Free against Twin's $2.99. Waveform also leads on update cadence (daily vs fortnightly) and device support (5 vs 3). Twin's advantage is rating (5.0 vs 4.3) and review sentiment (76% vs 60%). On 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
Waveform is free to download; Twin costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Twin holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 8 and 14 respectively. Written reviews point the same way: 76% of Twin's written reviews are positive against 60% of Waveform's.
Twin ships an update fortnightly, Waveform daily. The most recent releases landed on October 13, 2026 and October 14, 2026 respectively.
| Parameter | Twin | Waveform |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 5.0 (8 ratings) — better | 4.3 (14 ratings) |
| Positive reviews | 76.0% of reviews — better | 60.0% of reviews |
| Number of ratings | 8 | 14 — better |
| Update frequency | Fortnightly | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac, Apple TV, Apple Watch — better |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 1 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Hiroyuki Ueda | Evan Mourmouras |
Customer experience
Twin
Waveform
In-app purchases
Twin
No in-app purchases
Waveform
No in-app purchases








