Pi vs Locket
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Save and track anniversaries
- Customizable reminders
- Support for various time units
- Create custom event parameters
- Track nerdy and significant events
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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.
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.
- Relationship time tracking
- Anniversary reminders
- Home screen widget
- Photo sharing
- Milestone celebration
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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
Verdict
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
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.
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.
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.
| Parameter | Pi | Locket |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) | 5.0 (4 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 2 | 4 — better |
| Update frequency | Every 5 months | Every 2 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 16.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 4 MB | 65 MB |
| Age rating | 4+ | 4+ |
| Developer | Sestra Studio | Sans Software, LLC |
Customer experience
Pi
Locket
In-app purchases
Pi
No in-app purchases
Locket
- Unlimited access$4.997 Days
- Unlimited access3 Days trial$39.991 Year
Questions
Is Pi free?
Is Locket free?
Which has better reviews, Pi or Locket?
Do Pi or Locket have ads?
Which is updated more often, Pi or Locket?
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