Calculator vs Formudrag
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculator
This utility app allows users to perform calculations and view the formulas used. It offers the ability to edit past calculations and share results via email or memos. An optional purchase can remove advertisements.
- View calculation formulas
- Edit past formulas
- Share calculations
- Ad-free option via purchase
- Output to memos or email
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This is a calculator. You can see the formula. You can edit formulas later. To edit a formula, tap the place you want to edit. Purchasing an option allows you to turn off advertisements. Since there is a sharing function, you can output calculation formulas and results to memos or send them by e-mail.
Formudrag
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Formudrag helps you build, edit, and organize math formulae with drag-and-drop LaTeX tools. Start from built-in templates or your own saved components, replace exact structures directly, and keep a scratchpad nearby while refining the main formula. Use it for class notes, assignments, research drafts, teaching materials, and other academic workflows that need faster formula editing without losing structural control. End User License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is ads: Formudrag at none against Calculator's shown. On price, update cadence, in-app purchases and device support 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. Calculator sells 1 one-off in-app purchase and Formudrag sells 7 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | Calculator | Formudrag |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (10 ratings) — better | — |
| Positive reviews | 42.9% of reviews | — |
| Number of ratings | 10 — better | — |
| Update frequency | Every 2 months | Every 2 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 94 MB |
| Age rating | 4+ | 4+ |
| Developer | Hideki Ogawa | 欣 王 |
In-app purchases
Calculator
- Remove in-app ads$2.99
Formudrag
- Monthly7 Days trial$1.991 Month
- Annual7 Days trial$12.991 Year
- Drag Indicator Styles$1.99
- Formula History Access$2.99
- Export Formats$4.99
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- Lifetime2 variants$29.99
- Lifetime$39.99
