AquaCalculator vs iFieldSurvey
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
AquaCalculator
This app helps dedicated marine aquarists manage and document their aquariums. It tracks water parameters, manages animal stock, and calculates precise salt and nutrient additions. It also offers tools for adjusting calcium, alkalinity, and magnesium levels.
- Manage multiple aquariums
- Water value documentation with graphs and tables
- Animal administration with notes and pictures
- Recurrent memory for care tasks
- Salt quantity estimation
- Nutrient and chemical adjustment calculators
- Extensive setting options
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The reference software for dedicated marine aquarists The AquaCalculator is not free. In order to be able to use the AquaCalculator permanently, you must complete a paid subscription after two weeks. In the first two weeks, the AquaCalculator can be tested for free and the subscription can be stopped at any time before it is chargeable. The app for documentation and management of your aquarium. The main focus is on saltwater aquariums but also their freshwater pools can of course be documented with the AquaCalculator. With the AquaCalculator you have the suitable manager at your fingertips to keep an eye on all important parameters regarding the care of your aquarium. A big request: unfortunately we can not respond to reviews. If you have problems with the app, please contact us via email shortly (Support). So far we could clarify every question :-) The reference software for every dedicated marine aquarist: - Manage several basins in parallel - Documentation of the water values in graph and table form per pool. You can document your water readings, take notes or deposit pictures. The pictures can also be commented on. - Animal Administration. You can also assign notes and pictures to your animals in the basin and thus get a quicker overview of the development of their stock. - Dates: Management of recurrent memories help to keep track of the care of aquariums - Realistic estimation of the required salt quantity of commercially available sea salt mixtures. How much salt is actually needed to "adjust the salt content" or for the next "water change"? AquaCalculator calculates this using self-determined measurements of almost all commercially available sea salt mixtures. - Addition of nutrients (nitrate and phosphate) - Calculator to adjust calcium / alkalinity / magnesium: Expensive special agents are passé. AquaCalculator calculates the exact dosing quantities and stock solutions required for the adjustment of calcium, alkalinity (KH) and Mg concentration of low-cost salts. Supports recipes from Aquafair, Aquaforest, Coral-Care, Fauna Marin, MT Aquaristics, Nyos, H.W. Balling, Price Aquaristics, A.Glaser, Red Sea, Sangokai, Tropic Marin, Fritz ProAquatics, Two Little Fishies, Kent Marine, Seachem, Brightwell, Continuum Aquatics, ESV and Self-Defined. - Extensive setting options for the measuring instruments used, as well as the chem. Recipes. - Mini-FAQ: answers the most important questions about adjusting the water values and thus the successful care of reef aquariums. Including ten thousand times downloaded seawater FAQs by Martin Kuhn (Water Parameter FAQ, Anemone FAQ, Plague Master FAQs 1 and 2) NOTE: We have provided iBooks from Apple for viewing the Seawater FAQs. The ad must have iBooks or another PDF viewing app installed on your device. To use the AquaCalculator you must have a valid subscription. This will enable you to take full advantage of the Aquacalculator, benefit from regular updates and enhancements, secure data storage and synchronization of your data with other devices. Without a valid subscription, you can only read but not modify your data. The term is one year. Payment will be made through your iTunes account. The subscription will automatically renew if it is not canceled 24 hours before the end of the current period. Within 24 hours before the end of the current period, the amount for the renewal will be charged. Termination of automatic renewal is possible at any time. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms of Use and Privacy: https://acalc.de/pages/impressum
iFieldSurvey
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Collecting surveys at a trade show, retail counter, or classroom? No signal, no backend, no problem — iFieldSurvey turns any iPhone or iPad into a self-service response kiosk, with every answer kept on-device. • Fully offline: zero backend, zero third-party dependencies — build, collect, and analyze without a network • Five question types: single choice, multiple choice, text, rating, and NPS, plus branching logic and auto-graded exams • Kiosk mode: an idle attract screen, oversized touch targets, and an automatic return to the welcome screen after each submission — built for unattended booths • Local Wi-Fi distribution: generate a QR code so attendees fill in the form from their own phone browser, with data never leaving your network • Offline lottery with redemption codes: spin the wheel on-site, issue a one-time redemption code for prizes, and prevent the same code from being claimed twice • Live results wall: a real-time Swift Charts dashboard for response counts, distributions, and NPS — perfect for a booth display • One-tap CSV/PDF export with custom brand colors • iPad split view, business card scanning, voice notes, location fencing, and multi-device LAN aggregation for more demanding events No subscription trap — pay once and own it forever, or choose monthly/yearly Pro for a single event. Download iFieldSurvey and make your next event, classroom, or store survey fast and reliable. Apple Official User Documentation (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is device support: AquaCalculator at 4 against iFieldSurvey's 1. On price, ads, in-app purchases and iOS requirement 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. AquaCalculator sells 5 in-app purchases, starting at $3.99 per month and iFieldSurvey sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
| Parameter | AquaCalculator | iFieldSurvey |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (12 ratings) — better | — |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 12 — better | — |
| Update frequency | Every 3 weeks | — |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Subscription | — |
| Devices | iPhone, iPad, Mac, Vision Pro — better | iPhone |
| Requires iOS | 18.6 | 17.0 — better |
| Further details — not scored | ||
| Size | 49 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Thallos | Naihe Hu |
In-app purchases
AquaCalculator
- AquaCalculator monthly3 Days trial$3.991 Month
- AquaCalculator yearly14 Days trial$19.991 Year
- A large coffee$3.99
- Ice Tead and a Sandwich$9.99
- Something to learn$39.99
iFieldSurvey
- MonthlyPro$2.991 Month
- YearlyPro$24.991 Year
- ClassicLifetimePro$39.99









