Mobile app · Education & science

Guessaday

Guess the day of week of a random date.

Completely free
Android
Open source

Ad-supported exit link (Clictune): an intermediate page may show for a few seconds before the official website. Direct link to the website, no intermediate page

Download from the official source

Link to the official download page, ad-supported (Clictune): an intermediate page may show for a few seconds. Direct link to the download

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by F-Droid
License: GPL-3.0 — Open source (copyleft)confirmed by F-Droid
Open source: Yes
Commercial use: Yesconfirmed by F-Droid, Official plan pages (pricing, licence, terms)
Account required: not documented
Credit card required: Noconfirmed by F-Droid
Watermark: Not applicable
Ads: No
Platforms: AndroidEstablished by Android: F-Droid
Publisher: Moritz Firsching
Latest version: 2.1.0 (9 November 2026)
Latest activity: 9 November 2026
Source code: github.com/mo271/guessaday

At a glance

All of Guessaday is free: no feature is locked behind a paid plan, and its code is open.

Its licence (GPL-3.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
No advertising
Commercial use allowed

Sources and checks

Facts collected from F-Droid (credit card, source code, publisher, licence, free status, platforms, ads, commercial use, version) — 9 November 2026
Facts collected from Official plan pages (pricing, licence, terms) (commercial use) — 8 November 2026
Last technical check: 6 November 2026
Description from F-Droid — F-Droid (citation courte)

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