Smart vs Polygon
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Smart
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技術の概要 土壌の養分濃度に応じて発色する試験紙“みどりくん®”と色を読み取る機器“Pico”を組み合わせた土壌分析に利用するアプリです。 みどりくんⓇとは 東京農業大学によって開発された、簡易土壌診断試キットです。 土壌に精製水を加え、振とうした懸濁液に、試験紙を直接浸すと土壌養分の濃度に応じて呈色します。 Pico(簡易測色計)とは 親指サイズ(18×15×60mm / 16g)の測色計です。 実物から色を読み取り、iOS版のスマートフォン端末にインストールした専用のアプリにBluetooth 接続で情報を転送し、あらかじめ登録した色見本帳と照合することができます。
Polygon
Calculate complex properties of any polygonal figure, including centroids, moments of inertia, and perimeter. Simply input vertex coordinates for instant results, saving significant time on tedious calculations.
- Polygon Centroids
- Moments of Inertia (Ix, Iy, Ixy)
- Polar Moment of Inertia
- Radius of Gyration
- Principal Moments of Inertia
- Area and Perimeter
- Side Lengths
- Hollow Sections
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Polygon will allow you to calculate complex and tedious calculations related to any polygonal figure, whether concave or convex, regular or irregular, in a simple and instantaneous way: - Polygon Centroids - Moments of Inertia Ix, Iy, Ixy - Polar Moment of Inertia - Radius of gyration - Principal Moments of Inertia (Iu, Iv and their respective angles) - Area and Perimeter of the polygon - Length of each side of the polygon - Even incorporate hollow sections - Rotate the axes to a custom angle - Define new custom axes at any point - and much more You just have to enter the coordinates of the vertices of your polygon and press the button and it will immediately calculate all the previous properties, saving valuable time. Subscription Terms: Payment will be charged to Itunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turnerd off at least 24-hours before the end of the current period. Account will be charged for renewal within 24-hour prior to the end of the current period, and identify the cost of the renewal. Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Setting after purchase. No cancellation of the current subscription is allowed during active subscription period. For in-app purchases and subscriptions, see Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Smart at none against Polygon's 4. Smart also leads on iOS requirement (9.0 vs 17.0). Polygon's advantage is update cadence (weekly vs every 3 weeks). On price, ads 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. Polygon sells 4 in-app purchases, starting at $2.99 per month. Smart asks for nothing beyond the download.
Smart ships an update every 3 weeks, Polygon weekly. The most recent releases landed on September 14, 2026 and September 20, 2026 respectively.
| Parameter | Smart | Polygon |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 3 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 9.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 51 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | Palette | Adrian Caballero |
In-app purchases
Smart
No in-app purchases
Polygon
- Pro Access$2.991 Month
- Pro Access$4.996 Months
- Pro Access$6.991 Year
- Pro Access$9.99









