Comparison

Days Since vs Testify

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

Head to head
About

Days Since

This app helps you track the number of days since significant life events or habits. Set reminders and use widgets to stay motivated in building new routines or breaking old ones.

Highlights
  • Unlimited event counters
  • Customizable reminders
  • Home screen widgets
  • Organize events by category
  • Customizable color themes and app icons
Features
Read full description

Days Since helps you count the days that passed since you last did the things that matter most to you! Create memories of important life events like starting college or a new job, keep track of when you last went to the dentist or took your dog to the vet, form new habits like a daily workout or quit old ones such as smoking. You can create a new counter for each event, which will display the days that passed since you last did it. You can reset the counter at any time or choose to receive reminders and display it as a widget to stay motivated. Features: - Unlimited event cards to count the days since you last did something. - Reminders in the form of daily, weekly, or monthly notifications.  - Customizable categories to organize your events. - Widgets to display your events on your home screen.  - Custom color themes - 5 different app icons - Great for habit tracking, ADHD routines, sobriety milestones, and productivity goals Whether you're trying to build better habits, track emotional progress, or stay motivated through life changes—Days Since is your personal time tracker. Download now and take control of your habits, streaks, and memories! Apple's standard Terms of Use apply: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Testify

This app helps you conduct scientific experiments in your daily life. Define a hypothesis, track your results, and get clear, statistical explanations of whether your findings are significant. It supports various statistical tests and offers visual data analysis.

Highlights
  • Create experiments with hypotheses
  • Track daily results and notes
  • Automatic statistical analysis
  • Visual charts and confidence intervals
  • Plain-English result explanations
  • CSV import/export (Pro)
  • PDF report export (Pro)
Features
Read full description

Testify lets you run real experiments on your everyday life. Wondering if keeping your windows closed keeps your house warm? Curious whether wearing socks affects your productivity? Maybe you want to see if your sports team plays better if it is raining? Stop guessing and start testing. Set up an experiment with a hypothesis, track your results day by day, and let Testify crunch the numbers. The app automatically picks the right statistical test for your data — Chi-Squared for yes/no outcomes, or a Two-Sample T-Test for measurements — and tells you in plain language whether your results are meaningful or if you need more data. Features: - Create experiments with a hypothesis and a variable to test - Record trials with date, time, results, and optional contextual notes - Automatic statistical analysis with Chi-Squared and Welch's T-Test - Optional Bayesian view showing the probability one variant is better, with a 95% credible interval - Sequential analysis with a Pocock boundary so repeated peeking doesn't inflate false positives - Visual charts comparing your control and treatment groups, with a best-fit trend line for numeric experiments - Confidence intervals so you can see the range of possible effects - Post-hoc statistical power analysis - Sample size estimates that tell you how much more data you need - Plain-English explanations of your results — no stats degree required - Share polished result images with friends or social media - Daily reminders to log your data, with deep links straight to the experiment - Edit experiments and trials at any time, conclude or reopen as your investigation evolves - Track multiple experiments at once with a last-viewed summary card - Home screen widget showing your most recent experiment and a one-tap Add Trial shortcut - First-launch walkthrough to get you started quickly - Light and dark mode support Testify Pro (optional subscription): - Unlimited experiments - CSV import and export for your trial data - Multi-page PDF report export with charts, summary, and trial table Whether you're optimizing your daily routine, identifying patterns, or just settling a debate with yourself, Testify gives you the statistical tools to find out what actually works.

Screenshots

Days Since4 screens
Testify4 screens

Verdict

The call

The clearest difference is rating: Testify at 5.0 against Days Since's 3.3. Days Since's advantage is monetization model (free vs freemium) and ratings volume (153 vs 1). On price, ads, in-app purchases 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. Days Since sells 3 in-app purchases, starting at $2.99 per 7 days and Testify sells 1 in-app purchase, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Testify holds the better App Store score, 5.0 against 3.3. That said, the two scores are not equally well evidenced: Days Since has 153 ratings behind it against 1, so its average is the more settled of the two.

Scorecard3 real differences · 7 level
Days Since versus Testify: the parameters behind the verdict, then further details
ParameterDays SinceTestify
PriceFreeFree
Rating3.3 (153 ratings)5.0 (1 ratings) — better
Positive reviews25.5% of reviews—
Number of ratings153 — better1
Update frequencyEvery 2 months—
AdsNoNo
In-app purchasesYesYes
MonetizationFree — betterFreemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.026.0
Further details — not scored
Size29 MB4 MB
Age rating4+4+
DeveloperGood SnoozeRowena Ricalde

Customer experience

Days Since

All ratings153 ratings
Positive58.2%
Neutral2.0%
Negative39.9%
Written reviews94 reviews
Positive25.5%
Neutral2.1%
Negative72.3%

Testify

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

Days Since

Subscriptions3
  • Weekly Subscription1 Month trial$2.997 Days
  • DaysSince Monthly1 Month trial$4.991 Month
  • Annual Subscription1 Month trial$19.991 Year
1 purchases

Testify

Subscriptions1
  • Unlock all features$1.991 Month

Questions

Is Days Since free?
Days Since is free to download, with in-app purchases available.
Is Testify free?
Testify is free to download, with in-app purchases available.
Which has better reviews, Days Since or Testify?
Testify is rated higher. Days Since averages 3.3 out of 5 from 153 ratings, while Testify averages 5.0 from 1 ratings.
Do Days Since or Testify have ads?
Neither Days Since nor Testify shows ads.

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