When Does vs TdSE
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
When Does
This app provides the dates for numerous holidays and observances throughout the year. Users can easily add these events to their personal calendars or send them via email to themselves or others. It's a convenient reference for tracking important dates, including major holidays and time changes.
- Holiday date lookup
- Add holidays to calendar
- Email holiday information
- Includes major holidays
- Tracks US Daylight Saving Time
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When Does tells you when a number of holidays occur in a given year. It allows you to add the holiday to your calendar or to email it to you or to someone else. If you want to know when a holiday occurs, look here! It includes Chinese New Year, Martin Luther King Day, Valentine's Day, St. Patrick's Day, Easter, Passover, and many more! It also includes the start and end of US Daylight Savings Time.
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.
Screenshots
Verdict
The clearest difference is price: TdSE at Free against When Does's $0.99. When Does's advantage is update cadence (every 5 months vs every 24 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; When Does costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
When Does ships an update every 5 months, TdSE every 24 months. The most recent releases landed on June 4, 2026 and October 3, 2026 respectively.
| Parameter | When Does | TdSE |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 5 months — better | Every 24 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 47 MB | 80 MB |
| Age rating | 4+ | 4+ |
| Developer | Paul T Cottey | NC Lab |
In-app purchases
When Does
No in-app purchases
TdSE
No in-app purchases
