Comparison

Whendy Fast Time Planner vs SSSS Mobile

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Whendy Fast Time Planner

This app helps you avoid being late by calculating when to start each task for an event. Simply input your target completion time and the duration of each step, and it will provide a clear schedule.

Highlights
  • Calculate start times backwards from a target time
  • Input task durations
  • View start and end times for each step
  • Import events from calendar (Premium)
  • Export activities to calendar (Premium)
  • Share plans as formatted text
Features
Read full description

When should you get started? Just ask Whendy. No more time math: Start with a target time and then work your way back. It’s that simple! Time math is hard Do you sometimes get started too late? Ever arrived late to an appointment? Almost missed a flight? Or unnecessarily waited at the gate for hours? Sometimes you know when you need to be done, and you know how long each step takes. But it’s hard to do the math in your head and know when to start. Whendy makes it easy! Why Whendy? For many daily tasks, a proper project planner is overkill, a calendar seems clumsy, and a to-do list won’t tell you when. Whendy is a simple, clean, text-based way to plan out when to start each needed activity to arrive on time for your crucial event. It’s easy to make a plan Check out the screenshots and you’ll get it right away. Just type in your target time (when will your flight board?), and list the durations of steps before (from airport to gate 90 min, get parking 45 min, …, pack 60 min). Done! Whendy tells you when each step will begin and end, and when to start with step 1. Is Whendy for you? • Are you frustrated by time math where you are adding or subtracting times? • Do you like the effectiveness of a to-do list? • Do you like to keep it simple yet well thought-through? Then yes, Whendy is for you! *Whendy Premium*  • import events from your calendar. Quickly start a new plan without typing in the starting or ending time • export activities back to your calendar.  Premium is free for the first couple of uses so you can try it out without committing to anything. Additional ways to use Whendy Find out when you’ll be done • Type in "now" to insert the current time • Add tasks + durations • See when each step will begin and end, and when you’ll be done with everything Create a meeting agenda • Type in start time + duration of each segment • Done! Can we squeeze it in • You already have a plan for the day but new tasks pop up • Draft out your day to help you prioritize Share your plans • Send your plan as a nicely formatted text • Your friend or partner can stick to your mutual plan Created with love Whendy has been crafted with care. Hannes, its sole developer, has spent years refining it in daily use, before deciding to share it with you. It has helped with getting to countless appointments on time, juggling family life and chores as well as making the best use of weekends considering all family members’ needs.

About

SSSS Mobile

This app implements Shamir's Secret Sharing Scheme, allowing you to split text secrets into multiple shares. These shares can be reconstructed when a specific threshold is met, and can be shared via QR codes or text.

Highlights
  • Split secrets into multiple shares
  • Reconstruct secrets with a threshold
  • Share shares via QR code
  • Share shares via text
  • Retrieve shares from QR code
  • Retrieve shares from NFC Tag
Features
Read full description

SSSS Mobile is an implementation of Shamir's Secret Sharing Scheme (SSSS). In cryptography, Secret Sharing allows you to split a short "secret" text into multiple shares for later reconstruction when a specified threshold of shares are available. With SSSS Mobile, shares can be copied into another application or encoded in a QR Code and shared via email. Shares can later be retrieved from text, QR Code or NFC Tag (when available). You can also write shares to an NFC tag using a 3rd party NFC app. The optional Token parameter is prefixed to the share text to help describe the share or threshold. Some possible use cases for SSSS Mobile: * Split a short message intended for a group of individuals to decode only when the group is together. It may be interesting to store the shares on NFC tags attached to physical objects in this scenario. * Split an important but rarely used strong password across multiple QR Codes. Print and hide these QR codes in multiple locations for later retrieval. * Encrypt a large file with a difficult to remember password. Store the file in a potentially insecure location, but store the SSSS shares that protect your password in various other locations. Perhaps hide a large number of shares but only require a lower threshold for combination later if there is potential for some shares to be lost. * Encrypt the private key to your Bitcoin or other cryptocurrency holdings with an impossible to remember password. SSSS split the password, print the shares to QR Code and bury them in multiple locations. Require a lower threshold than the total number of hidden shares in case some are lost or damaged over time. IMPORTANT #1: If you intend to protect potentially important information, please take all necessary backup precautions and use at your own risk! IMPORTANT #2: The threshold must be met EXACTLY at the time of retrieval/combination. You cannot combine more or less than the exact threshold specified at the time that the share set is generated. It may be useful to use the optional Token parameter to indicate the threshold. Combining the wrong number of shares or invalid shares may result in an error OR an incorrect secret message reconstruction. IMPORTANT #3: The secret message must be 128 characters or less. The longer the message, the more processing time will be required for splitting and combining. For large secrets it is recommended to encrypt with a tool such as PGP/GPG and SSSS split only the password. Additional Notes: * This app uses the ssss-js library by Gabriel Burca to be compatible with the "ssss" UNIX/Linux application by B. Poettering.

Screenshots

Whendy Fast Time Planner4 screens
SSSS Mobile4 screens

Verdict

The call

The clearest difference is in-app purchases: SSSS Mobile at none against Whendy Fast Time Planner's 1. SSSS Mobile also leads on update cadence (every 8 days vs every 3 weeks) and iOS requirement (13.0 vs 17.0). Whendy Fast Time Planner's advantage is ratings volume (12 vs 2). On price, rating, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Whendy Fast Time Planner sells 1 one-off in-app purchase. SSSS Mobile asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

SSSS Mobile holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Whendy Fast Time Planner has 12 ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

Whendy Fast Time Planner ships an update every 3 weeks, SSSS Mobile every 8 days. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

Scorecard5 real differences · 5 level
Whendy Fast Time Planner versus SSSS Mobile: the parameters behind the verdict, then further details
ParameterWhendy Fast Time PlannerSSSS Mobile
PriceFreeFree
Rating4.8 (12 ratings)5.0 (2 ratings) — better
Positive reviews100.0% of reviews—
Number of ratings12 — better2
Update frequencyEvery 3 weeksEvery 8 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.013.0 — better
Further details — not scored
Size3 MB9 MB
Age rating4+4+
DeveloperHannes OudDustin Runnells

Customer experience

Whendy Fast Time Planner

All ratings11 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews8 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

SSSS Mobile

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Whendy Fast Time Planner

One-time1
  • Premium$3.99
None

SSSS Mobile

No in-app purchases

Questions

Is Whendy Fast Time Planner free?
Whendy Fast Time Planner is free to download, with in-app purchases available.
Is SSSS Mobile free?
SSSS Mobile is free to download, with no in-app purchases.
Which has better reviews, Whendy Fast Time Planner or SSSS Mobile?
SSSS Mobile is rated higher. Whendy Fast Time Planner averages 4.8 out of 5 from 12 ratings, while SSSS Mobile averages 5.0 from 2 ratings.
Do Whendy Fast Time Planner or SSSS Mobile have ads?
Neither Whendy Fast Time Planner nor SSSS Mobile shows ads.
Which is updated more often, Whendy Fast Time Planner or SSSS Mobile?
Whendy Fast Time Planner ships an update every 3 weeks, and SSSS Mobile every 8 days. Most recently, Whendy Fast Time Planner was updated on November 2, 2026 and SSSS Mobile on November 4, 2026.

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