TdSE vs S61 PPC
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TdSE
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The TdSE app lets you browse times, locations, and descriptions for sessions, and special events and more information about the symposium.
S61 PPC
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Sikorsky S61N Performance Planning data on your wrist or your phone! Just flip your wrist and see how much power you will have for takeoff. Shows both OGE and IGE. Want a 500 pound power margin? No problem, just set the margin and the weight will turn yellow when inside your margin, green with plenty of margin and red if you are gross weight.
Screenshots
Verdict
The clearest difference is price: TdSE at Free against S61 PPC's $2.99. TdSE also leads on update cadence (every 24 months vs every 48 months). On ads, in-app purchases, device support 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
TdSE is free to download; S61 PPC costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
TdSE ships an update every 24 months, S61 PPC every 48 months. The most recent releases landed on October 19, 2026 and May 17, 2026 respectively.
| Parameter | TdSE | S61 PPC |
|---|---|---|
| Price | Free — better | $2.99 |
| Update frequency | Every 24 months — better | Every 48 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 15.6 — better | 16.6 |
| Further details — not scored | ||
| Size | 80 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | NC Lab | Arsenal Dev LLC |
In-app purchases
TdSE
No in-app purchases
S61 PPC
No in-app purchases
