Comparison

Pi vs Locket

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

Head to head
About

Pi

Never miss an important date again! This app helps you save and track anniversaries with custom reminders. It supports various time units and allows you to create your own event parameters for personalized tracking.

Highlights
  • Save and track anniversaries
  • Customizable reminders
  • Support for various time units
  • Create custom event parameters
  • Track nerdy and significant events
Features
Read full description

Never forget another event again! Pi-Anniversary will save the date and remind you when its anniversary is coming up. Be it one year, six months, Pi * 10^3 days or 0x77777 seconds. Ever wanted to measure your child’s age according to the Mayan calendar? With many anniversary parameters built-in and the option to create your own to match what’s means most to you, Pi-Anniversary is the perfect choice to keep track of nerdy events. Important or mundane, sad or happy, there will always be an occasion to commemorate with Pi-Anniversary.

About

Locket

Track your relationship journey and celebrate milestones together. See your time together in days, weeks, and more, and receive automatic anniversary reminders. Share photos and special moments with your partner.

Highlights
  • Relationship time tracking
  • Anniversary reminders
  • Home screen widget
  • Photo sharing
  • Milestone celebration
Features
Read full description

Locket: Relationship Tracker - Celebrate Every Moment Together Track your relationship journey and celebrate every milestone. See exactly how long you've been together, share your favorite photos, and never miss an anniversary. Featuring: Relationship Tracker - Track your time together in years, months, weeks, days, and minutes Anniversary Reminders - Automatic notifications for 1-month, 6-month, and yearly milestones Home Screen Widget - Display your photos and relationship stats on your iPhone home screen Easy Sharing - Share your milestones with your partner Perfect for new couples, long-term partners, and everyone in between. Super simple to set up: add your names, relationship start date, and photos. Locket does the rest, automatically tracking your time together and reminding you of special moments.

Screenshots

Pi4 screens
Locket3 screens

Verdict

The call

The clearest difference is in-app purchases: Pi at none against Locket's 2. Pi also leads on ads (none vs shown). Locket's advantage is update cadence (every 2 weeks vs every 5 months). On price, rating, ratings volume 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. Locket sells 2 in-app purchases, starting at $4.99 per 7 days. Pi asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Pi against 5.0 for Locket. Both are backed by a comparable volume of ratings — 2 and 4 respectively.

UpkeepUpdate frequency

Pi ships an update every 5 months, Locket every 2 weeks. The most recent releases landed on October 19, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
Pi versus Locket: the parameters behind the verdict, then further details
ParameterPiLocket
PriceFreeFree
Rating5.0 (2 ratings)5.0 (4 ratings)
Positive reviews—100.0% of reviews
Number of ratings24 — better
Update frequencyEvery 5 monthsEvery 2 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhoneiPhone, iPod — better
Requires iOS16.615.1 — better
Further details — not scored
Size4 MB65 MB
Age rating4+4+
DeveloperSestra StudioSans Software, LLC

Customer experience

Pi

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

Locket

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Pi

No in-app purchases

2 purchases

Locket

Subscriptions2
  • Unlimited access$4.997 Days
  • Unlimited access3 Days trial$39.991 Year

Questions

Is Pi free?
Pi is free to download, with no in-app purchases.
Is Locket free?
Locket is free to download, with in-app purchases available.
Which has better reviews, Pi or Locket?
Pi and Locket are both rated 5.0 out of 5 on the App Store, from 2 and 4 ratings respectively.
Do Pi or Locket have ads?
Locket shows ads; Pi does not.
Which is updated more often, Pi or Locket?
Pi ships an update every 5 months, and Locket every 2 weeks. Most recently, Pi was updated on October 19, 2026 and Locket on October 24, 2026.

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