Plot Calculator vs PrepLex
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Plot Calculator
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This app is designed to aid small plot researchers. It contains unit converter, area calculator and fertilizer rate calculator. It also calculates the amount of fertilizer material needed per plot, rep, and trial using fertilizer nutrient concentration, plot size, number of treatments and reps. This project is supported by Oklahoma Fertilizer CheckOff, Oklahoma Agriculture Experiment Stations and the Oklahoma Cooperative Extension.
PrepLex
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Build vocabulary fast with quick daily sessions. Learn new words, review to make them stick, and track progress as you master packs. No account needed—perfect for commutes or breaks. Great for IELTS/TOEFL/SAT/GRE prep. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://preplexinc.web.app/privacy.html
Screenshots
Verdict
The clearest difference is in-app purchases: Plot Calculator at none against PrepLex's 3. Plot Calculator also leads on ads (none vs shown) and iOS requirement (10.2 vs 18.0). On price, update cadence 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. PrepLex sells 3 in-app purchases, starting at $1.99 per 7 days. Plot Calculator asks for nothing beyond the download.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 8, 2026 and October 2, 2026 respectively.
| Parameter | Plot Calculator | PrepLex |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 10.2 — better | 18.0 |
| Further details — not scored | ||
| Size | 13 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Oklahoma State University | Ilker KARAMANLI |
In-app purchases
Plot Calculator
No in-app purchases
PrepLex
- Weekly Premium$1.997 Days
- Monthly Premium3 Days trial$3.991 Month
- Yearly Premium7 Days trial$19.991 Year
Questions
Is Plot Calculator free?
Is PrepLex free?
Do Plot Calculator or PrepLex have ads?
Which is updated more often, Plot Calculator or PrepLex?
Other comparisons
